CN202600756U - RFID (Radio Frequency Identification Devices) tag with stress sensitive device and RFID system - Google Patents
RFID (Radio Frequency Identification Devices) tag with stress sensitive device and RFID system Download PDFInfo
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- CN202600756U CN202600756U CN 201220257725 CN201220257725U CN202600756U CN 202600756 U CN202600756 U CN 202600756U CN 201220257725 CN201220257725 CN 201220257725 CN 201220257725 U CN201220257725 U CN 201220257725U CN 202600756 U CN202600756 U CN 202600756U
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Abstract
The utility model provides an RFID (Radio Frequency Identification Devices) tag with a stress sensitive device and an RFID system. The stress sensitive device and an antenna of the RFID tag are connected to form a parallel structure, a logic circuit for controlling on-off and a voltage-resistance conversion device are arranged on a line formed by connecting the stress sensitive device and a chip of the RFID tag, and the connected line, the logic circuit and the voltage-resistance conversion device are part of the chip. When the logic circuit is disconnected, the stress sensitive device and the antenna are not connected in parallel, and the first resonant frequency and the signal strength of the antenna remain unchanged if the sensitive device is stressed; when the logic circuit is connected, the stress sensitive device and the antenna are connected in parallel, and the antenna works at a second resonant frequency if the sensitive device is stressed; and the RFID tag receives a command sent by the RFID reader to control the on-off of the logic circuit, so that the change of stress is detected by comparing the difference between strengths of signals with different frequencies from the antenna. With the RFID tag with a stress sensitive device and the RFID system, the change of the stress can be detected at a low cost.
Description
Technical field
The utility model relates to RFID (Radio Frequency Identification, RF identification) technical field, relates in particular to a kind of RFID label, rfid system with stressed sensor.
Background technology
In recent years, rfid system had become more prevalent.Rfid system is mainly used in the identification to people and thing.In general, this system comprises a RFID reader at least, and this RFID reader can transmit and receive the radiofrequency signal from one or more RFID labels in the scope of a setting.This RFID label generally encapsulates, and can be attached on the object, and it comprises the microchip that an ability and antenna carry out information interchange.This microchip is an integrated circuit in general, and it can be used for storing and process information, the modulation radiofrequency signal, and can move other specific function.The antenna of RFID label is to be used for receiving and sending radiofrequency signal, and is applicable to a kind of special frequency usually.
In some equipment, the stressed acceptable that when surpassed that the rfid system that has stressed sensor has been used to monitor product environment of living in receives force intensity.In general these equipment requirements induction installations will have a lasting energy source, are used for detecting the change of pressure, but this can increase the cost of equipment.In addition, some equipment requirements induction installations also will link to each other with a comparator circuit, thereby detect the degree size that departs from reference voltage, and this requirement has increased the cost of equipment greatly.In a word, improve rfid system and be necessary, its requires when not using lasting energy source or use a kind of adjunct circuit cheaply, can be used for detecting the variation of pressure.
The utility model content
The utility model embodiment provides a kind of RFID label, rfid system with stressed sensor, detects the variation of pressure at lower cost.
On the one hand, the utility model embodiment provides a kind of RFID label with stressed sensor, and two pins are arranged on the chip of said RFID label; Two pins of said stressed sensor and this link to each other; And form parallel-connection structure with the antenna of said RFID label; The external world receives the variation of force intensity can cause stressed sensor voltage or change in current; Logical circuit and a voltage-resistance conversion equipment that a control break-make is arranged on said stressed sensor and circuit that the chip of RFID label is connected; The circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip; Voltage-resistance conversion equipment is used for converting stressed sensor voltage or change in current to changes in resistance, the break-make of logical circuit determined stressed sensor whether with the sky line parallel: when logical circuit breaks off, stressed sensor not with the sky line parallel; This moment, first resonant frequency and the signal intensity of antenna remained unchanged if sensor is under pressure; When logical circuit was connected, stressed sensor was with the characteristic frequency of antenna and signal intensity had one at least and changed if sensor is under pressure a day line parallel, this moment, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of pressure.
Optional, in the utility model one embodiment, the antenna of said RFID label is a monopole antenna.
Optional, in the utility model one embodiment, the antenna of said RFID label is a double-doublet antenna: said stressed sensor and the voltage-resistance conversion equipment that links to each other with this stressed sensor form parallel-connection structure with antenna wherein; Perhaps said stressed sensor forms parallel-connection structure simultaneously with the voltage-resistance conversion equipment that links to each other with this stressed sensor and two antennas.
Optional; In the utility model one embodiment; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET to, and said stressed sensor comprises: pressure resistance type pressure sensitive device, piezoelectric type pressure sensitive device, piezoelectric type device for measuring force, piezoelectric type acceleration pick-up unit, macromolecular material piezoelectric sensing device, resonance sensor, type vibration wire pressure sensitive device, vibration cylinder type pressure sensitive device, diaphragm-vibrating type pressure sensitive device, inductance type pressure sensitive device, air gap inductance formula pressure sensitive device, inductance type oil pressure sensor, torque detecting apparatus.
On the other hand, the utility model embodiment provides a kind of RFID label with stressed sensor, and a pin is arranged on the chip of said RFID label; One end of said stressed sensor links to each other with this pin; The other end is connected on the antenna of said RFID label; And form parallel-connection structure with antenna; The external world receives the variation of force intensity can cause stressed sensor voltage or change in current; Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on said stressed sensor and circuit that the chip of RFID label is connected, and the circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip, and voltage-resistance conversion equipment is used for converting stressed sensor voltage or change in current to changes in resistance; The break-make of logical circuit determined stressed sensor whether with the sky line parallel: when logical circuit breaks off; Stressed sensor not with the sky line parallel, this moment if sensor be under pressure, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, stressed sensor was with the characteristic frequency of antenna and signal intensity had one at least and changed if sensor is under pressure a day line parallel, this moment, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of pressure.
Optional, in the utility model one embodiment, the antenna of said RFID label is a monopole antenna.
Optional, in the utility model one embodiment, the antenna of said RFID label is a double-doublet antenna: said stressed sensor and the voltage-resistance conversion equipment that links to each other with this stressed sensor form parallel-connection structure with antenna wherein; Perhaps said stressed sensor forms parallel-connection structure simultaneously with the voltage-resistance conversion equipment that links to each other with this stressed sensor and two antennas.
Optional; In the utility model one embodiment; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET to, and said stressed sensor comprises: pressure resistance type pressure sensitive device, piezoelectric type pressure sensitive device, piezoelectric type device for measuring force, piezoelectric type acceleration pick-up unit, macromolecular material piezoelectric sensing device, resonance sensor, type vibration wire pressure sensitive device, vibration cylinder type pressure sensitive device, diaphragm-vibrating type pressure sensitive device, inductance type pressure sensitive device, air gap inductance formula pressure sensitive device, inductance type oil pressure sensor, torque detecting apparatus.
Another aspect; The utility model embodiment provides a kind of RFID label with stressed sensor; Said stressed sensor is connected on the antenna of said RFID label; And forming parallel-connection structure with antenna, the external world receives the variation of force intensity can cause stressed sensor voltage or change in current, on said stressed sensor and circuit that antenna is connected, a logical circuit and a voltage-resistance conversion equipment of controlling break-make is arranged; The circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip; Voltage-resistance conversion equipment is used for converting stressed sensor voltage or change in current to changes in resistance, the break-make of logical circuit determined stressed sensor whether with the sky line parallel: when logical circuit breaks off, stressed sensor not with the sky line parallel; This moment, first resonant frequency and the signal intensity of antenna remained unchanged if sensor is under pressure; When logical circuit was connected, stressed sensor was with the characteristic frequency of antenna and signal intensity had one at least and changed if sensor is under pressure a day line parallel, this moment, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of pressure.
Optional, in the utility model one embodiment, the antenna of said RFID label is a monopole antenna.
Optional, in the utility model one embodiment, the antenna of said RFID label is a double-doublet antenna: said stressed sensor and the voltage-resistance conversion equipment that links to each other with this stressed sensor form parallel-connection structure with antenna wherein; Perhaps said stressed sensor forms parallel-connection structure simultaneously with the voltage-resistance conversion equipment that links to each other with this stressed sensor and two antennas.
Optional; In the utility model one embodiment; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET to, and said stressed sensor comprises: pressure resistance type pressure sensitive device, piezoelectric type pressure sensitive device, piezoelectric type device for measuring force, piezoelectric type acceleration pick-up unit, macromolecular material piezoelectric sensing device, resonance sensor, type vibration wire pressure sensitive device, vibration cylinder type pressure sensitive device, diaphragm-vibrating type pressure sensitive device, inductance type pressure sensitive device, air gap inductance formula pressure sensitive device, inductance type oil pressure sensor, torque detecting apparatus.
Another aspect, the utility model embodiment provides a kind of rfid system with stressed sensor, and said rfid system comprises RFID label and RFID reader, and said RFID label comprises above-mentioned RFID label with stressed sensor; Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby detects the change of pressure from the difference between the signal intensity of the different frequency of antenna through comparison.
Technique scheme has following beneficial effect: because adopt the antenna of stressed sensor and RFID label to form parallel-connection structure; Logical circuit and a voltage-resistance conversion equipment that a control break-make is arranged on stressed sensor and circuit that the chip of RFID label is connected; The circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip: when logical circuit breaks off; Stressed sensor not with the sky line parallel; If sensor is under pressure, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected, a stressed sensor and a day line parallel, if sensor is under pressure, this moment, antenna was operated under second resonant frequency; The RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit; Thereby realize detecting from the difference between the signal intensity of the different frequency of antenna the technological means of the change of pressure through comparison; So reached the technique effect that can detect the variation of pressure at lower cost; And the energy that utilizes RFID to obtain, solved the powerup issue of stressed detection.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The synoptic diagram that Fig. 1 is connected with the RFID label chip for the stressed sensor of the utility model embodiment;
Fig. 2 is the equivalent circuit diagram of RFID label chip inside antenna;
Fig. 3 is the synoptic diagram that the stressed sensor of the utility model embodiment, logic switch and voltage-resistance conversion equipment are connected with RFID label chip inside antenna equivalent electrical circuit;
The synoptic diagram that Fig. 4 directly is connected for stressed sensor of the utility model embodiment and RFID label antenna;
Fig. 5 is the structure key diagram of the stressed sensor of the utility model embodiment;
Fig. 6 is the process flow diagram of the utility model embodiment based on the stressed strength detecting method of signal intensity.
Embodiment
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
The stressed sensor of the utility model embodiment links to each other with the chip of RFID label and has three kinds of situation at least:
The two pins structure:
The utility model is a kind of device, system and technology that is used for detecting stressed Strength Changes.This system has comprised a label, and two pins are arranged on the chip of this label.Two pins of stressed sensor and this link to each other, and form parallel-connection structure with antenna.The external world receives the variation of force intensity can cause stressed sensor voltage or change in current.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on pin and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert stressed sensor voltage or change in current to changes in resistance.
The break-make of logical circuit determined stressed sensor whether with the sky line parallel.When logical circuit breaks off, stressed sensor not with the sky line parallel.This moment, stressed sensor was under pressure as if sensor, and first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit was connected, stressed sensor was with the characteristic frequency of antenna and signal intensity had one at least and changed if sensor is under pressure a day line parallel, this moment, and this moment, antenna was operated under second resonant frequency.Reader can send the break-make of instruction control logical circuit to label, when logical circuit is connected, can detect the change of pressure through comparison from the difference between the signal intensity of the different frequency of antenna.
With regard to an instance, this system has comprised a label, has only an antenna (monopole antenna) on this label.Two pins are arranged on the chip of this label.Two pins of stressed sensor and this link to each other, and form parallel-connection structure with antenna.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on pin and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert stressed sensor voltage or change in current to changes in resistance.
Stressed sensor when logical circuit is connected is if sensor is under pressure, and antenna features frequency and signal intensity have one at least and change, and it is operated under second resonant frequency.Reader can send instruction to label, and the difference between the signal intensity of the different frequency during through the comparison logic break-make can detect the change of pressure.Or rather, voltage-resistance conversion equipment can be an equivalent electrical circuit that variable voltage is converted to variable-resistance device, ditch type FET or FET.And the instantiation of stressed sensor comprises: pressure resistance type pressure sensitive device, piezoelectric type pressure sensitive device, piezoelectric type device for measuring force, piezoelectric type acceleration pick-up unit, macromolecular material piezoelectric sensing device, resonance sensor, type vibration wire pressure sensitive device, vibration cylinder type pressure sensitive device, diaphragm-vibrating type pressure sensitive device, inductance type pressure sensitive device, air gap inductance formula pressure sensitive device, inductance type oil pressure sensor, torque detecting apparatus etc.
With regard to another instance, this system has comprised a label, and two antennas (double-doublet antenna) are arranged on this label.Two pins of stressed sensor and this link to each other, and form parallel-connection structure with first antenna.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on pin and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert stressed sensor voltage or change in current to changes in resistance.This moment voltage-resistance conversion equipment of linking to each other with stressed sensor also with first sky line parallel, and second antenna is all the time with the first resonant frequency proper communication.
When logical circuit is connected, be placed on certain receiving under the force intensity, first antenna features frequency and signal intensity have at least a meeting to change, and it is operated under second resonant frequency.Reader can send instruction to label, and the difference between the signal intensity of the different frequency of first and second antennas can detect the change of pressure when connecting through comparison logic.Difference between the signal intensity of the different frequency during logical circuit break-make through second antenna self relatively also can detect the change of pressure.Or rather, voltage-resistance conversion equipment can be an equivalent electrical circuit that variable voltage is converted to variable-resistance device, ditch type FET or FET.And the instantiation of stressed sensor comprises: pressure resistance type pressure sensitive device, piezoelectric type pressure sensitive device, piezoelectric type device for measuring force, piezoelectric type acceleration pick-up unit, macromolecular material piezoelectric sensing device, resonance sensor, type vibration wire pressure sensitive device, vibration cylinder type pressure sensitive device, diaphragm-vibrating type pressure sensitive device, inductance type pressure sensitive device, air gap inductance formula pressure sensitive device, inductance type oil pressure sensor, torque detecting apparatus etc.
One pin configuration:
The chip of this label can only have a pin, and this pin outwards links to each other with an end of stressed sensor, and the other end of stressed sensor is directly linked on the antenna.Pin is similar in the situation of the tie point of chip internal and two pins, finally remains the purpose that will reach with day line parallel.Simultaneously on pin and circuit that the chip internal circuit is connected, a logical circuit of controlling break-make is arranged.In addition, on the circuit of antenna again the parallel connection a voltage-resistance conversion equipment, voltage-resistance conversion equipment has circuit to be connected with the two-termial line of stressed sensor and logical circuit again.
When logical circuit breaks off, stressed sensor not with the sky line parallel, this moment if sensor be under pressure, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit was connected, stressed sensor was with antenna features frequency and signal intensity had one at least and changed if sensor is under pressure a day line parallel, this moment, and it is operated under second resonant frequency.Reader can send the break-make of instruction control logical circuit to label, when logical circuit is connected, can detect the change of pressure through comparison from the difference between the signal intensity of the different frequency of antenna.
With regard to an instance, this system has comprised a label, has only an antenna (monopole antenna) on this label.Stressed sensor links to each other with this pin, and the other end of stressed sensor is directly linked on the antenna, forms parallel-connection structure with this root antenna.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on pin and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert stressed sensor voltage or change in current to changes in resistance.
If sensor is under pressure, antenna features frequency and signal intensity have one at least and change when logical circuit is connected, and it is operated under second resonant frequency.Reader can send instruction to label, and the difference between the signal intensity of the different frequency during through the comparison logic break-make can detect the change of pressure.Or rather, voltage-resistance conversion equipment can be an equivalent electrical circuit that variable voltage is converted to variable-resistance device, ditch type FET or FET.And the instantiation of stressed sensor comprises: pressure resistance type pressure sensitive device, piezoelectric type pressure sensitive device, piezoelectric type device for measuring force, piezoelectric type acceleration pick-up unit, macromolecular material piezoelectric sensing device, resonance sensor, type vibration wire pressure sensitive device, vibration cylinder type pressure sensitive device, diaphragm-vibrating type pressure sensitive device, inductance type pressure sensitive device, air gap inductance formula pressure sensitive device, inductance type oil pressure sensor, torque detecting apparatus etc.
With regard to another instance, this system has comprised a label, and two antennas (double-doublet antenna) are arranged on this label.Stressed sensor with this one by one pin link to each other, the other end of stressed sensor is directly linked on the antenna, forms parallel-connection structure with first antenna.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on pin and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert stressed sensor voltage or change in current to changes in resistance.This moment voltage-resistance conversion equipment of linking to each other with stressed sensor also with first sky line parallel, and second antenna is all the time with the first resonant frequency proper communication.
When logical circuit is connected, be placed on certain receiving under the force intensity, first antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have at least a meeting to change.Reader can send instruction to label, and when connecting through comparison logic, the difference between the signal intensity of the different frequency of first and second antennas can detect the change of pressure.Difference between the signal intensity of the different frequency during logical circuit break-make through first antenna self relatively also can detect the change of pressure.Or rather, voltage-resistance conversion equipment can be an equivalent electrical circuit that variable voltage is converted to variable-resistance device, ditch type FET or FET.And the instantiation of stressed sensor comprises: pressure resistance type pressure sensitive device, piezoelectric type pressure sensitive device, piezoelectric type device for measuring force, piezoelectric type acceleration pick-up unit, macromolecular material piezoelectric sensing device, resonance sensor, type vibration wire pressure sensitive device, vibration cylinder type pressure sensitive device, diaphragm-vibrating type pressure sensitive device, inductance type pressure sensitive device, air gap inductance formula pressure sensitive device, inductance type oil pressure sensor, torque detecting apparatus etc.
No pin configuration:
When not having pin on the chip of RFID label, stressed sensor can directly be linked on the antenna.Stressed sensor and antenna form parallel-connection structure.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on antenna and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert stressed sensor voltage or change in current to changes in resistance.In this case, the antenna that links to each other with stressed sensor can not break away from stressed sensor and communicate by letter with first resonant frequency.When being under pressure as if sensor, second resonant frequency of antenna and signal intensity have one at least and change.Reader can send instruction to label apparatus, detects the change of pressure from the difference between the signal intensity of the different frequency of antenna through comparison.
With regard to an instance, this system has comprised a label, and two antennas (double-doublet antenna) are arranged on this label.Stressed sensor directly links to each other with first antenna.Stressed sensor and antenna form parallel-connection structure.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on antenna and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert stressed sensor voltage or change in current to changes in resistance.And second antenna do not link to each other with stressed sensor all the time with the first resonant frequency proper communication.When being placed on certain receiving under the force intensity, first antenna features frequency and signal intensity have at least a meeting to change, and it is operated under second resonant frequency, and the characteristic frequency of second antenna and signal intensity are constant.Reader can send instruction to label, and can detect the change of pressure through the difference between the signal intensity of the different frequency of first and second antennas relatively.Or rather, voltage-resistance conversion equipment can be an equivalent electrical circuit that variable voltage is converted to variable-resistance device, ditch type FET or FET.And the instantiation of stressed sensor comprises: pressure resistance type pressure sensitive device, piezoelectric type pressure sensitive device, piezoelectric type device for measuring force, piezoelectric type acceleration pick-up unit, macromolecular material piezoelectric sensing device, resonance sensor, type vibration wire pressure sensitive device, vibration cylinder type pressure sensitive device, diaphragm-vibrating type pressure sensitive device, inductance type pressure sensitive device, air gap inductance formula pressure sensitive device, inductance type oil pressure sensor, torque detecting apparatus etc.
In the same way, can be with on the chip of antenna also and can not be with pin, can be with one also can be with a plurality of pins.The radical of antenna can be one, two or even many.Also can connect one or more stressed sensors accordingly, the model of stressed sensor can be the same or different simultaneously.In addition, the voltage that is attached thereto-resistance conversion equipment also can have many variations.With regard to a kind of instantiation of device, when being placed on and certain receiving under the force intensity, the resonant frequency of the antenna that links to each other with stressed sensor and signal intensity have at least a meeting to change.Reader can send instruction to label apparatus, detects the change of pressure from the difference between the signal intensity of the different frequency of antenna through comparison.
With regard to a kind of instantiation of stressed sensor, the method for simultaneous comparison numerical value comprises that these are compared numerical value compares with most signal strength values.These signal strength values belong to different frequencies, and interrelate with the force intensity that receives of majority, can detect based on the above-mentioned comparison of mentioning simultaneously and receive intensity of force.
Yet with regard to another aspect, a rfid system comprises a RFID label apparatus and a RFID reader device.This RFID label apparatus is used to send two kinds of signals, the signal when signal when promptly above-mentioned logical circuit breaks off and logical circuit are connected, and these two kinds of signals have at least a kind of meeting that the request that receives is responded.The RFID reader device is used for the RFID label apparatus is sent a request at least.Reading device is installed is the fiducial value between the signal strength values in order to receive signal strength values and logical circuit when connecting and to break off, and be converted into stressed varying level to these fiducial values from the logical circuit of label.
In an example, the antenna of RFID label links to each other with stressed sensor, and the logical circuit of a control break-make is arranged on this connection line.Stressed sensor and antenna form parallel-connection structure.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on antenna and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert stressed sensor voltage or change in current to changes in resistance.Under logical circuit break-make whether two kinds of situation, this antenna has two kinds of corresponding with it different frequencies, i.e. first resonant frequency and second resonant frequency.Be positioned over certain receiving under the force intensity when the logical circuit connection and this label apparatus,, will produce the intensity level of unlike signal owing to the variation of resonant frequency.
In an example, the RFID label apparatus comprises first, second two antennas.Better situation is; First antenna links to each other with voltage-resistance conversion equipment with stressed sensor; When this label apparatus is placed on certain receiving under the force intensity, because the variation of resonant frequency, will produce the different of secondary signal intensity level and first signal strength values.
Another aspect, the utility model embodiment provides a kind of rfid system with stressed sensor, and said rfid system comprises RFID label and RFID reader, and said RFID label comprises above-mentioned RFID label with stressed sensor; Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby detects the change of pressure from the difference between the signal intensity of the different frequency of antenna through comparison.
Again on the one hand; The utility model embodiment provides a kind of stressed detection method of the rfid system with stressed sensor; Said stressed detection method is applied to above-mentioned rfid system with stressed sensor, comprising: send the break-make of instruction with the logical circuit of control RFID label through said FRID reader; Receive the break-make of the instruction of FRID reader transmission through the RFID label: when logical circuit breaks off with control logic circuit; Stressed sensor not with the sky line parallel; This moment, first resonant frequency and the signal intensity of antenna remained unchanged if sensor is under pressure; When logical circuit was connected, stressed sensor was with the characteristic frequency of antenna and signal intensity had one at least and changed if sensor is under pressure a day line parallel, this moment, and this moment, antenna was operated under second resonant frequency; Utilize the comparison of said FRID reader to detect the change of pressure from the difference between the signal intensity of the different frequency of antenna.
As shown in Figure 1, the synoptic diagram of the stressed responsive label 10 that is connected with the RFID label chip for the stressed sensor of the utility model embodiment.As shown in Figure 1, label apparatus 10 comprises 13, two pins 16,17 of 15, one surface-mounted integrated circuits of a base and a double-doublet antenna 11,12.Two pins 16,17 are arranged on the surface-mounted integrated circuit 13, and these two pins outwards link to each other with stressed sensor 14, and these two pins are parallelly connected with the equivalent electrical circuit of antenna at chip internal, and the logical circuit of a control break-make is arranged on the circuit that connects.Stressed sensor and antenna form parallel-connection structure.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on antenna and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert stressed sensor voltage or change in current to changes in resistance.Whether stressed sensor can be controlled by in the access chip circuit through the break-make of logical circuit, thereby the frequency of the antenna that links to each other with radio-frequency module can be influenced.When logical circuit broke off, label antenna was with the first resonant frequency communication.When logical circuit is connected, be placed on certain receiving under the force intensity, antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have one at least and change.
In an example, transmitting terminal antenna 11,12 is processed by one or more different low electrical resistant materials, and these materials have higher electric conductivity; Copper for example, silver, and aluminium; They link to each other with antenna 11,12 through two pins 16,17 with the above-mentioned stressed sensor of mentioning; When antenna 11,12 is placed on certain receiving under the force intensity, stressed sensor can cause the variation of one or more transmitting terminal generation resonant frequencies.The frequency of the frequency of this variation and reception and transmission is all different.For example, when logical circuit was connected, stressed sensor was positioned over certain receiving under the force intensity, will cause sending that at least one changes in frequency and the receive frequency.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies that necessarily receives under the force environment, and when reaching certain when stressed, it will reduce then.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies that necessarily receives under the force intensity, and certain it will rise when receiving force intensity when reaching.The so stressed sensor that can be used for the utility model has: pressure resistance type pressure sensitive device, piezoelectric type pressure sensitive device, piezoelectric type device for measuring force, piezoelectric type acceleration pick-up unit, macromolecular material piezoelectric sensing device, resonance sensor, type vibration wire pressure sensitive device, vibration cylinder type pressure sensitive device, diaphragm-vibrating type pressure sensitive device, inductance type pressure sensitive device, air gap inductance formula pressure sensitive device, inductance type oil pressure sensor, torque detecting apparatus etc.
Type based on stressed sensor is different, and the force intensity that receives that causes changing possibly be that a specific stress value also possibly be a scope of stress value selectively.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.The type of the stressed sensor that for example, has on the antenna can influence the length that changes the antenna resonance frequency required time.
As shown in Figure 2, be the equivalent circuit diagram of RFID label antenna.In the alternating magnetic field that tag coil antenna entering read write line produces, the interaction between label antenna and the reading and writing device antenna just is similar to transformer.Both coils are equivalent to the primary coil and the secondary coil of transformer.Resonant tank by label antenna forms is as shown in Figure 2; The coil inductance (L), stray capacitance (Cp) and the shunt capacitance (C2) that comprise label antenna; Its resonance frequency is the parallelly connected equivalent capacity of Cp and C2 for C in
formula; R1, R2 are the equivalent resistance of circuit internal inductance coil and other devices.The carrier frequency that label and read write line two-way communication are used is exactly f.The tag antenna coil profile is very little when requiring; Be that area is little; And need certain operating distance, the aerial coil mutual induction amount that RFID label and read write line are asked just obviously can not practical requirement, can have the Ferrite Material of high permeability in the inner insertion of tag antenna coil; With the increase mutual induction amount, thus the little problem of compensating coil xsect.
As shown in Figure 3, be the stressed sensor of the utility model embodiment, the logical circuit of control break-make and the synoptic diagram that voltage-resistance conversion equipment is connected with RFID label antenna equivalent electrical circuit.Resonant tank by label antenna forms is as shown in the figure; The coil inductance (L), stray capacitance (Cp) and the shunt capacitance (C2) that comprise label antenna; Its resonance frequency is the parallelly connected equivalent capacity of Cp and C2 for
formula C; R1, R2 are the equivalent resistance of circuit internal inductance coil and other devices.M is the variable resistor of the stressed sensor of representative, and S is the logical circuit of control break-make, and R3 is the equivalent resistance of connecting with stressed sensor, and F is voltage-resistance conversion equipment.When logical circuit breaks off, stressed sensor not with the sky line parallel, this moment if sensor be under pressure, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit was connected, stressed sensor was with antenna features frequency and signal intensity had one at least and changed if sensor is under pressure a day line parallel, this moment, and this moment, antenna was operated under second resonant frequency.
As shown in Figure 4, be the synoptic diagram that stressed sensor of the utility model embodiment and RFID label antenna directly link to each other, can detect the sketch of passive RFID tags device 40 of the variation of pressure.As shown in Figure 4, label apparatus 40 comprises 45, one integrated circuit 43 of a base and a double-doublet antenna 41,42.The stressed sensor 44 that links to each other with antenna 42 will influence the resistance of antenna 42.The material that stressed sensor 44 is suitable for can be controlled the frequency that any one had both been fixed a point according to any one current voltage in the antenna 41,42.With regard to an instance, fixing up an aerial wire 41,42 can make it produce resonance in identical frequency.With regard to another instance, fixing up an aerial wire 41,42 can make it produce resonance in different frequency.
In an example, transmitting terminal antenna 41,42 is processed by one or more different low electrical resistant materials; These materials have higher electric conductivity, copper for example, silver; And aluminium, they link to each other with the above-mentioned stressed sensor of mentioning, when antenna 41; 42 are placed on certain receiving under the force intensity, and stressed sensor can cause the variation of one or more transmitting terminal generation resonant frequencies, thereby cause a different frequency.The frequency of the variation of this frequency and reception and transmission is all different.For example, stressed sensor is positioned over certain receiving under the force intensity, will cause sending that at least one changes in frequency and the receive frequency.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies that necessarily receives under the force environment, and when reaching certain when stressed, it will reduce then.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies that necessarily receives under the force intensity, and certain it will rise when receiving force intensity when reaching.The so stressed sensor that can be used for the utility model has: pressure resistance type pressure sensitive device, piezoelectric type pressure sensitive device, piezoelectric type device for measuring force, piezoelectric type acceleration pick-up unit, macromolecular material piezoelectric sensing device, resonance sensor, type vibration wire pressure sensitive device, vibration cylinder type pressure sensitive device, diaphragm-vibrating type pressure sensitive device, inductance type pressure sensitive device, air gap inductance formula pressure sensitive device, inductance type oil pressure sensor, torque detecting apparatus etc.
Type based on stressed sensor is different, and the force intensity that receives that causes changing possibly be that a specific stress value also possibly be a scope of stress value selectively.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.The type of the stressed sensor that for example, has on the antenna can influence the length that changes the antenna resonance frequency required time.
As shown in Figure 5, the unidirectional force cell of piezoelectric type is made up of quartz wafer 51, insulation sleeve 52, electrode 53, loam cake 54 and pedestal 55.The loam cake of sensor is a force transfer element, its outer rim wall thickness 0.1 ~ 0.5mm, and when external force is done the time spent, it will produce elastic deformation and power will be delivered on the quartz wafer.Quartz wafer Chi Cunwei &8mm*1mm, it is insulated the cover location.The dynamometry scope of this sensor is 0 ~ 50N, and minimum resolution is 0.01N.Natural frequency is 50 ~ 60kHz..The principle of work of piezoelectric transducer is based on behind some crystal 51 stressed F the piezoelectric effect that produces electric charge on its surface.Common piezoelectric 51 has the polycrystal pottery (like barium titanate, zirconium metatitanic acid etc.) of quartz crystal, synthetic.The piezoelectric property of piezoelectricity original paper is represented with piezoelectric modulus, because there is anisotropy in piezoelectric crystal, in order to distinguish the direction that receives force direction and crystal to produce electric charge, the leftover bits and pieces that generally is employed in piezoelectric modulus symbol d marks.Commonly used 1,2,3 represent the direction of x, y, three axles of z respectively, and represent around x, y, three axial tangential effects of z with 4,5,6.The order of subfix, first for receiving force direction, second direction for the generation electric charge.For example dzz promptly is illustrated on the z direction of principal axis stressed and producing electric charge perpendicular to z on the axial plane.
As shown in Figure 6, detect a kind of method flow diagram of stressed change through the label apparatus that uses many antennas for the utility model.What need consider is, the above-mentioned device of mentioning uses a label integrated circuit to carry out and the exchanging of a plurality of antennas.
As shown in Figure 6,50, the RFID reader sends energy and instruction to label apparatus.52, logical circuit is in the state of disconnection at initial time, and label apparatus is with the antenna received energy and the instruction that do not link to each other with stressed sensor.54, label apparatus is converted into DC (direct current) voltage to the electromagnetic wave that carries energy, thereby just can make label carry out the requirement of indication.And this conversion need be used a charge pump, and a rectification circuit perhaps interconnects it, perhaps will use other energy conversion device.56, label apparatus sends signal through the sky alignment reader that does not link to each other with stressed sensor.58, the energy intensity of receiving signal is measured and write down to reader.60, reader sends the instruction of connecting logical circuit to label apparatus.62, label apparatus is used the antenna transmission data that link to each other with stressed sensor.64, the energy intensity of signal is received in the reader measurement.66, reader calculated goes out the fiducial value of a reflected signal intensity.68, reader changes into different stressed intensity levels with fiducial value.With regard to an instance, reader can be set the signal that a time period is used for receiving label, if do not receive signal, reader will be recorded as 0 with signal intensity.
In this system, reader will compare its signal strength values with the label antenna that links to each other with stressed sensor from the signal strength values of the antenna that does not link to each other with stressed sensor as a reference value.Through receive from the signal that links to each other with stressed sensor with the transmitting terminal that does not link to each other with stressed sensor, reader can be collected the fiducial value of representing unlike signal intensity.Then, the RFID reader can be converted into the residing force intensity that receives of label to such fiducial value.With regard to a concrete instance, disposing this RFID reader is to be converted into stress value for the difference from the RF signal intensity that connects the antenna that does not perhaps connect stressed sensor that will receive through the reference data of using storage.
Best situation is, with the antenna that does not connect stressed sensor as a reference, can be with owing to the variation that coupling caused between label and the reader filters out.In addition, as before mention, variation and the label that stressed sensor is applied to the resistance value that can make it in the design is placed on specific time length under stressed and forms relation one to one.For example; Stressed sensor is only positioned on an antenna; Can allow like this to change within the specific limits as a kind of function from the signal of RFID label apparatus, and this function just antenna be placed on the function that just has after certain time under stressed.The same, through using the utility model, under the passive condition of RFID label, the RFID reader can detect label apparatus whether be placed certain stressed down and within the acceptable range whether this stressed.
Do not use the various RFID labels of two antennas also can perceive stressed variation with stressed sensor, the variation that the stressed variation of perception is based on resonant frequency on the antenna also can recognize the variation that antenna receives signal.
For example pass through design to the antenna that links to each other with stressed sensor; The frequency that can make antenna is at ISM (Industrial Scientific Medical; Industry, science, medical science) the interior variation of frequency range, can connect the antenna that this and stressed sensor and logical circuit link to each other on the label of standard.
For example label antenna can so be set in a concrete instance; Be exposed to necessarily receive in the force environment before; The resonant frequency of antenna is 902-928MHZ, but in a single day label is exposed to and necessarily receives in the force environment, because stressed influence; The resonant frequency of antenna is just reduced to 899.5-927.5MHZ; Frequency frequency range (902-928MHZ) at U.S. RFID is split into 52 channels, and reader can be skipped the channel that can not receive at random in these 52 channels, and the benefit of this jump of reader is exactly can a plurality of readers of effectively preventing in same physical space, to attempt the conflict of using same frequency to cause.
For example in an example, RFID frequency range (902-928MHZ) is not to be divided into 52 channels but the antenna settings that on average has been divided into n channel tag is carried out work under this frequency range (902-928MHZ).Because label antenna links to each other with stressed sensor, thus if the stressed scope that surpasses predefined value, the frequency of operation of antenna tag antenna just drops among (899.5-927.5MHZ) this frequency range.Therefore compare just channel n to be got rid of from band limits with original frequency range and go, the frequency range (899.5-927.5MHZ) after therefore changing is carried out exchanging of information with regard to no longer allowing label with channel n.
In concrete instance; If the environment at label place has surpassed the field of load of expection; Reader can only send instruction to label through channel 1 to n-1, and label also can be made a response, because the antenna in the label just can only be worked in this frequency range; When reader with the frequency of n channel when label sends instruction; Because the stressed variation of label has caused the resonant frequency of label antenna to drop to 899.5-927.5MHZ, just no longer make a response so no longer reach the 928MHZ label, pass information back reader.
Favourable aspect is because the stressed variation that has exceeded the operating frequency of antenna that predefined value causes is just reflected by the disappearance of this information interchange.
In model; Reader can send an instruction between channel n-1 and channel n to label and further check that drift has taken place the operating frequency range of label antenna; Because label can receive the instruction that sends through channel n-1; And can be to the reader feedback information through channel n-1; Because label can not receive the instruction that sends through channel n, and can not can so just confirm that drift has taken place the operating frequency range of label antenna to the reader feedback information through channel n.
Stressed variation causes the frequency of operation of label antenna to take place upwards to be not limited in downward drift and the utility model frequency range on average is divided into n channel.
The utility model embodiment can detect the variation of pressure at lower cost, and the energy that utilizes RFID to obtain, and has solved the powerup issue of stressed detection.
The enforcement of each characteristics of this system may relate to software; The combination that hardware also possibly relate to software and hardware just can reach, and for example the enforcement of many advantages of system is to realize with the mutual mode that exchanges of computer and other equipment machines with object oriented programming languages with a kind of high-caliber processing through programming.Each such function program for example possibly be stored in the storage intermediary in the ROM (read-only memory) to be read by a computer and processor and realize above-mentioned function.
Those skilled in the art can also recognize the various illustrative components, blocks (illustrative logical block) that the utility model embodiment lists, and unit and step can be passed through electronic hardware, computer software, or both combinations realize.Be the clear replaceability (interchangeability) of showing hardware and software, above-mentioned various illustrative components (illustrative components), unit and step have been described their function generally.Such function is to realize depending on the designing requirement of certain applications and total system through hardware or software.Those skilled in the art can be for every kind of certain applications, and can make ins all sorts of ways realizes described function, but this realization should not be understood that to exceed the scope of the utility model embodiment protection.
Various illustrative logical block described in the utility model embodiment; Or the unit can pass through general processor, digital signal processor, special IC (ASIC); Field programmable gate array (FPGA) or other programmable logic device; Discrete gate or transistor logic, discrete hardware components, or the design of above-mentioned any combination realizes or operates described function.General processor can be microprocessor, and alternatively, this general processor also can be any traditional processor, controller, microcontroller or state machine.Processor also can realize through the combination of calculation element, for example digital signal processor and microprocessor, a plurality of microprocessors, Digital Signal Processor Core of one or more microprocessors associatings, or any other similarly configuration realize.
The method described in the utility model embodiment or the step of algorithm can directly embed hardware, the software module of processor execution or the two combination.Software module can be stored in the storage medium of other arbitrary form in RAM storer, flash memory, ROM storer, eprom memory, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or this area.Exemplarily, storage medium can be connected with processor, so that processor can read information from storage medium, and can deposit write information to storage medium.Alternatively, storage medium can also be integrated in the processor.Processor and storage medium can be arranged among the ASIC, and ASIC can be arranged in the user terminal.Alternatively, processor and storage medium also can be arranged in the various parts in the user terminal.
In one or more exemplary designs, the described above-mentioned functions of the utility model embodiment can realize in hardware, software, firmware or this three's combination in any.If in software, realize, these functions can be stored on the media with computer-readable, or are transmitted on the media of computer-readable with one or more instructions or code form.The computer-readable media comprises that the computer storage medium lets computer program transfer to other local telecommunication media from a place with being convenient to make.Storage medium can be the useable medium that any general or special computer can access.For example; Such computer readable media can include but not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or other any can be used to carry or store with instruction or data structure and other can be read the media of the program code of form by general or special computer or general or special processor.In addition; Any connection can suitably be defined as the computer-readable media; For example, if software is through a concentric cable, optical fiber computer, twisted-pair feeder, Digital Subscriber Line (DSL) or also being comprised in the defined computer-readable media with wireless mode transmission such as for example infrared, wireless and microwaves from a web-site, server or other remote resource.Described video disc (disk) and disk (disc) comprise Zip disk, radium-shine dish, CD, DVD, floppy disk and Blu-ray Disc, and disk is usually with the magnetic duplication data, and video disc carries out the optical reproduction data with laser usually.Above-mentioned combination also can be included in the computer-readable media.
Above-described embodiment; Purpose, technical scheme and beneficial effect to the utility model have carried out further explain, it should be understood that the above is merely the embodiment of the utility model; And be not used in the protection domain that limits the utility model; All within the spirit and principle of the utility model, any modification of being made, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (10)
1. the RFID label with stressed sensor is characterized in that, two pins are arranged on the chip of said RFID label; Two pins of said stressed sensor and this link to each other; And form parallel-connection structure with the antenna of said RFID label; The external world receives the variation of force intensity can cause stressed sensor voltage or change in current; Logical circuit and a voltage-resistance conversion equipment that a control break-make is arranged on said stressed sensor and circuit that the chip of RFID label is connected; The circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip; Voltage-resistance conversion equipment is used for converting stressed sensor voltage or change in current to changes in resistance, the break-make of logical circuit determined stressed sensor whether with the sky line parallel: when logical circuit breaks off, stressed sensor not with the sky line parallel; This moment, first resonant frequency and the signal intensity of antenna remained unchanged if sensor is under pressure; When logical circuit was connected, stressed sensor was with the characteristic frequency of antenna and signal intensity had one at least and changed if sensor is under pressure a day line parallel, this moment, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of pressure.
2. according to claim 1 with the RFID label of stressed sensor, it is characterized in that the antenna of said RFID label is a monopole antenna.
3. according to claim 1 with the RFID label of stressed sensor; It is characterized in that the antenna of said RFID label is a double-doublet antenna: said stressed sensor and the voltage-resistance conversion equipment that links to each other with this stressed sensor form parallel-connection structure with antenna wherein; Perhaps said stressed sensor forms parallel-connection structure simultaneously with the voltage-resistance conversion equipment that links to each other with this stressed sensor and two antennas.
4. the RFID label with stressed sensor is characterized in that, a pin is arranged on the chip of said RFID label; One end of said stressed sensor links to each other with this pin; The other end is connected on the antenna of said RFID label; And form parallel-connection structure with antenna; The external world receives the variation of force intensity can cause stressed sensor voltage or change in current; Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on said stressed sensor and circuit that the chip of RFID label is connected, and the circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip, and voltage-resistance conversion equipment is used for converting stressed sensor voltage or change in current to changes in resistance; The break-make of logical circuit determined stressed sensor whether with the sky line parallel: when logical circuit breaks off; Stressed sensor not with the sky line parallel, this moment if sensor be under pressure, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, stressed sensor was with the characteristic frequency of antenna and signal intensity had one at least and changed if sensor is under pressure a day line parallel, this moment, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of pressure.
5. like the said RFID label of claim 4, it is characterized in that the antenna of said RFID label is a monopole antenna with stressed sensor.
6. like the said RFID label of claim 4 with stressed sensor; It is characterized in that the antenna of said RFID label is a double-doublet antenna: said stressed sensor and the voltage-resistance conversion equipment that links to each other with this stressed sensor form parallel-connection structure with antenna wherein; Perhaps said stressed sensor forms parallel-connection structure simultaneously with the voltage-resistance conversion equipment that links to each other with this stressed sensor and two antennas.
7. RFID label with stressed sensor; It is characterized in that; Said stressed sensor is connected on the antenna of said RFID label; And forming parallel-connection structure with antenna, the external world receives the variation of force intensity can cause stressed sensor voltage or change in current, on said stressed sensor and circuit that antenna is connected, a logical circuit and a voltage-resistance conversion equipment of controlling break-make is arranged; The circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip; Voltage-resistance conversion equipment is used for converting stressed sensor voltage or change in current to changes in resistance, the break-make of logical circuit determined stressed sensor whether with the sky line parallel: when logical circuit breaks off, stressed sensor not with the sky line parallel; This moment, first resonant frequency and the signal intensity of antenna remained unchanged if sensor is under pressure; When logical circuit was connected, stressed sensor was with the characteristic frequency of antenna and signal intensity had one at least and changed if sensor is under pressure a day line parallel, this moment, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of pressure.
8. like the said RFID label of claim 7, it is characterized in that the antenna of said RFID label is a monopole antenna with stressed sensor.
9. like the said RFID label of claim 7 with stressed sensor; It is characterized in that the antenna of said RFID label is a double-doublet antenna: said stressed sensor and the voltage-resistance conversion equipment that links to each other with this stressed sensor form parallel-connection structure with antenna wherein; Perhaps said stressed sensor forms parallel-connection structure simultaneously with the voltage-resistance conversion equipment that links to each other with this stressed sensor and two antennas.
10. rfid system with stressed sensor, said rfid system comprises RFID label and RFID reader, it is characterized in that,
Said RFID label comprises each said RFID label with stressed sensor among the claim 1-3; Or each said RFID label among the claim 4-6, or each said RFID label among the claim 7-9 with stressed sensor with stressed sensor;
Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby detects the change of pressure from the difference between the signal intensity of the different frequency of antenna through comparison.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220257725 CN202600756U (en) | 2012-06-01 | 2012-06-01 | RFID (Radio Frequency Identification Devices) tag with stress sensitive device and RFID system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104217185A (en) * | 2013-06-03 | 2014-12-17 | 波音公司 | Radio Frequency Identification Notification System |
| CN105745667A (en) * | 2013-09-20 | 2016-07-06 | 移动搜索安全有限责任公司 | tool and document authentication system |
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2012
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104217185A (en) * | 2013-06-03 | 2014-12-17 | 波音公司 | Radio Frequency Identification Notification System |
| CN104217185B (en) * | 2013-06-03 | 2018-11-13 | 波音公司 | Radio frequency identification notifies system |
| CN105745667A (en) * | 2013-09-20 | 2016-07-06 | 移动搜索安全有限责任公司 | tool and document authentication system |
| CN105745667B (en) * | 2013-09-20 | 2018-11-27 | 移动搜索安全有限责任公司 | tool and document authentication system |
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