CN112781758B - Measurement device and measurement method for correcting force - Google Patents
Measurement device and measurement method for correcting force Download PDFInfo
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- CN112781758B CN112781758B CN202011643050.3A CN202011643050A CN112781758B CN 112781758 B CN112781758 B CN 112781758B CN 202011643050 A CN202011643050 A CN 202011643050A CN 112781758 B CN112781758 B CN 112781758B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
- G01L1/142—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators using capacitors
- G01L1/144—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators using capacitors with associated circuitry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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Abstract
The embodiment of the invention discloses a device for measuring the correcting force, which is used for measuring the correcting force of a correcting device on a correcting target, and comprises: the device comprises a sensor unit, a signal reading unit and a conversion unit; the sensor unit comprises a capacitance and a first inductance; the capacitor and the first inductor form a resonant circuit, and the capacitor deforms in response to the correcting force to change the resonant frequency of the resonant circuit; the signal reading unit comprises a second inductor; the second inductor is in mutual inductance coupling with the first inductor, and the resonant frequency of the resonant loop is obtained through the second inductor; and the conversion unit obtains the correcting force corresponding to the resonance frequency according to a relation formula of the frequency and the force.
Description
Technical Field
The invention relates to the field of wireless sensing, in particular to a device and a method for measuring correction force.
Background
With the continuous improvement of the living standard of people, the demand of people on tooth orthodontics is also continuously increased. The measurement of the correction force in the tooth correction process is of great importance, and the measurement of the correction force in the prior art is mainly carried out in vitro and mainly comprises the following three steps. Firstly, a standard dental model is amplified by 2 times after three-dimensional digital scanning, and then is output in a chromatography mode. And secondly, applying epoxy resin as an adhesive to the surface of the sensor, and adhering the sensor to the enlarged tooth model with force flatly. And thirdly, bonding the signal combination point of the sensor chip with the signal point of the flexible flat cable to realize the output of the signal. The whole process is measured by converting the change of force into the change of sensor resistance.
However, the above method is performed in vitro, and cannot reflect real force changes of teeth in oral cavity in real time.
Disclosure of Invention
In view of the above, the embodiments of the present invention provide a device and a method for measuring an orthodontic force to solve at least one of the problems in the background art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides a device for measuring the correcting force, which is used for measuring the correcting force of a correcting device on a correcting target, and comprises the following components: the device comprises a sensor unit, a signal reading unit and a conversion unit;
the sensor unit comprises a capacitance and a first inductance; the capacitor and the first inductor form a resonant circuit, and the capacitor deforms in response to the correcting force to change the resonant frequency of the resonant circuit;
the signal reading unit comprises a second inductor; the second inductor is in mutual inductance coupling with the first inductor, and the resonant frequency of the resonant loop is obtained through the second inductor;
and the conversion unit obtains the correcting force corresponding to the resonance frequency according to a relation formula of the frequency and the force.
In the above scheme, the orthodontic target is a tooth.
In the above scheme, the capacitor and the first inductor are integrally formed by etching the conductive substrate with laser.
In the above aspect, the conductive substrate includes at least one of copper, gold, or silver.
In the above scheme, the relationship formula of the frequency and the force is obtained through a calibration experiment of the force and the frequency; the calibration experiment specifically comprises the following steps: the method comprises the steps of sequentially applying a plurality of forces with different sizes on the sensor unit, recording the resonant frequency of the sensor unit under the action of the forces with different sizes, drawing a change relation graph of the resonant frequency and the forces, and obtaining a relation formula of the frequency and the forces through fitting.
In the above scheme, the signal reading unit further includes: and the frequency sweeping element is used for generating a frequency sweeping signal, the frequency sweeping signal enters the second inductor, and the resonance of the resonance loop is realized through magnetic coupling.
In the above scheme, the signal reading unit further includes: and the sampling element is connected with the second inductor and is used for sampling the signal on the second inductor.
In the above scheme, the signal reading unit further includes: and the main control element is connected with the sampling element and used for processing the signal output by the sampling element to obtain the resonant frequency.
In the above solution, the measuring apparatus further includes: and the human-computer interaction interface is connected with the signal reading unit and is used for displaying the reading result of the signal reading unit.
The embodiment of the invention also provides a method for measuring the correcting force, which is used for measuring the correcting force of the correcting device on the correcting target, and is characterized by comprising the following steps: providing a correction force measuring device, wherein the correction force measuring device is the measuring device in any one of the embodiments;
disposing the sensor unit between the orthosis and the orthosis target, the orthosis force acting on the sensor unit;
acquiring the resonant frequency of the sensor unit through the signal reading unit;
and the conversion unit obtains the correcting force corresponding to the resonance frequency according to a relation formula of the frequency and the force.
In the above scheme, the signal reading unit further includes a frequency sweeping element, a sampling element and a main control element;
acquiring, by the signal reading unit, a resonant frequency of the sensor unit, including: the master control element sends a frequency sweeping instruction to the frequency sweeping element to enable the frequency sweeping element to send a frequency sweeping signal;
the frequency sweeping signal enters the second inductor and enters the first inductor through magnetic coupling, so that the resonant circuit resonates;
the sampling element collects output signals of the second inductor and transmits the collected output signals to the main control element for processing;
and the main control element processes the output signal to obtain the resonant frequency of the resonant circuit.
In the above scheme, the relationship formula of the frequency and the force is obtained by a calibration experiment of the force and the frequency, and the calibration experiment specifically includes: the method comprises the steps of sequentially applying a plurality of forces with different sizes on the sensor unit, recording the resonant frequency of the sensor unit under the action of the forces with different sizes, drawing a change relation graph of the resonant frequency and the forces, and obtaining a relation formula of the frequency and the forces through fitting.
The device and the method for measuring the correcting force provided by the embodiment of the invention are used for measuring the correcting force of a correcting device on a correcting target, wherein the device for measuring the correcting force comprises the following components: the device comprises a sensor unit, a signal reading unit and a conversion unit; the sensor unit comprises a capacitance and a first inductance; the capacitor and the first inductor form a resonant circuit, and the capacitor deforms in response to the correcting force to change the resonant frequency of the resonant circuit; the signal reading unit comprises a second inductor; the second inductor is in mutual inductance coupling with the first inductor, and the resonant frequency of the resonant loop is obtained through the second inductor; and the conversion unit obtains the correcting force corresponding to the resonance frequency according to a relation formula of the frequency and the force. The sensor unit and the signal reading unit are connected through mutual inductance coupling between inductors, the sensor unit does not need to be powered by itself, and the correcting force of the correcting device on a correcting target can be acquired in a wireless mode in real time.
Drawings
Fig. 1 is a schematic structural diagram of an orthodontic force measuring device provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a sensor unit provided by an embodiment of the present invention;
fig. 3 is a flow chart of a correction force measuring method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the specific embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention; that is, not all features of an actual embodiment are described herein, and well-known functions and structures are not described in detail.
In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
The embodiment of the invention provides a device for measuring the correcting force, which is used for measuring the correcting force generated by a correcting device on a correcting target, and is characterized by comprising the following components: the device comprises a sensor unit, a signal reading unit and a conversion unit; the sensor unit comprises a capacitance and a first inductance; the capacitor and the first inductor form a resonant circuit, and the capacitor deforms in response to the correcting force to change the resonant frequency of the resonant circuit; the signal reading unit comprises a second inductor; the second inductor is in mutual inductance coupling with the first inductor, and the resonant frequency of the resonant loop is obtained through the second inductor; and the conversion unit obtains the correcting force corresponding to the resonance frequency according to a relation formula of the frequency and the force.
Fig. 1 is a schematic structural diagram of an orthodontic force measuring device provided in an embodiment of the present invention, and as shown in the drawing, the orthodontic force measuring device includes a sensor unit 1, a signal reading unit 2, and a conversion unit 3; the sensor unit 1 is used for sensing the correcting force of the correcting device on a correcting target, and the sensor unit 1 comprises a first inductor 11 and a capacitor 12; the capacitor 12 and the first inductor 11 form a resonant circuit, and the resonant circuit has a resonant frequency, and the resonant frequency changes with the change of the capacitance value.
In one embodiment, the target is a tooth and the appliance is a mouthpiece. But is not limited thereto, any object to be corrected may be the correction target.
In one embodiment, the capacitor 12 comprises an interdigital capacitor.
The sensor unit 1 is arranged between the appliance and the correction target, and the capacitor 12 deforms in response to the correction force between the appliance and the correction target, so that the capacitance value of the capacitor changes, and the resonance frequency of the resonance loop is changed.
Fig. 2 is a schematic diagram of a sensor unit provided in an embodiment of the present invention, and as shown in the figure, the sensor unit includes a first inductor and a capacitor, which are integrally formed by etching a copper substrate and encapsulated by Polydimethylsiloxane (PDMS). It should be noted that the black circuit in the copper substrate in fig. 2 is a laser etching circuit, and the laser etching device etches along the laser etching circuit to form the first inductor and the capacitor. The first inductor and the capacitor form a resonant circuit, and different first inductors and different capacitors are formed by changing the etching circuit, so that resonant circuits with different resonant frequencies can be obtained.
The size of the sensor unit is about 5mm by 5mm, and the sensor unit can be modified according to the size of the tooth.
It is to be understood that the material forming the sensor unit is not limited to copper, but may be other conductive materials such as gold, silver, and the like. It is noted that any conductive material with a low hardness may be applied to the embodiments of the present invention as a material for forming the sensor unit.
For the sensor, the response time, the recovery time and the sensitivity are important parameters for showing the performance of the sensor. According to the embodiment of the invention, the digital bridge LCR is adopted to measure the response time and the recovery time of the prepared sensor unit, and the sensor unit can rapidly respond and recover under different loads of 2N, 3N, 4N and 5N. Wherein the response time of the sensor unit reaches 0.63 seconds under 5N load, the recovery time reaches 0.49 seconds, and the sensitivity of the sensor unit reaches 0.11KPa under 2N to 5N load-1。
In practical applications, the measuring device may include a plurality of sensor units, the sensor units have different resonant frequencies, and the sensor units are correspondingly disposed between different orthodontic objects and the orthodontic appliances to measure the orthodontic forces between the orthodontic objects and the orthodontic appliances, respectively.
With continued reference to fig. 1, the signal reading unit 2 includes a second inductance 23; the second inductor 23 is mutually inductively coupled with the first inductor 11, and the resonant frequency of the resonant tank is obtained through the second inductor 23.
Specifically, the resonant circuit is equivalent to the second inductor 23 through mutual inductance coupling, that is, a reflection impedance, which is a part of the input impedance of the second inductor, the input impedance of the second inductor 23 is read out, and the resonant frequency of the resonant circuit is obtained by analyzing the characteristics of the input impedance.
More specifically, the frequency characteristic curve of the input impedance of the second inductor 23 will peak around the resonance frequency, so that the resonance frequency can be obtained by measuring the peak frequency of the frequency characteristic curve of the input impedance.
The signal reading unit 2 transmits the read resonant frequency to the conversion unit 3, and the conversion unit 3 obtains the correction force corresponding to the resonant frequency according to a relation formula of frequency and force.
Specifically, the relation formula of the frequency and the force is obtained through a calibration experiment of the force and the frequency. The calibration experiment specifically comprises the following steps: the method comprises the steps of sequentially applying a plurality of forces with different sizes on the sensor unit 1, recording the resonant frequency of the sensor unit 1 under the action of the forces with different sizes, drawing a change relation graph of the resonant frequency and the forces, and obtaining a relation formula of the frequency and the forces through fitting.
In an embodiment, the signal reading unit 2 further comprises a frequency sweep element 22, the frequency sweep element 22 being configured to generate a frequency sweep signal, the frequency sweep signal entering the second inductor 23, and resonating the resonant tank by magnetic coupling.
In a specific embodiment, the frequency sweep element 22 employs an ADI AD9910 chip capable of generating a frequency sweep signal up to 400MHz, with a frequency resolution of 0.23 Hz. But is not limited to this, and any element that can implement a frequency sweep may be applied to embodiments of the present invention.
In an embodiment, the signal reading unit 2 further includes a sampling element 24, and the sampling element 24 is electrically connected to the second inductor 23 to collect an output signal of the second inductor 23.
In a particular embodiment, the sampling element comprises an ADC sampling element. But is not limited to this, and any element that can implement a frequency sweep may be applied to embodiments of the present invention.
In an embodiment, the signal reading unit further includes a main control element 21, the main control element 21 is connected to the frequency sweep element 22, the main control element 21 sends a frequency sweep instruction to the frequency sweep element 22, so that the frequency sweep element 22 sends a frequency sweep signal, and the frequency sweep signal passes through the second inductor 23, and the resonant tank resonates through magnetic coupling. Meanwhile, the main control element 21 is further connected to the sampling element 24, receives the signal collected by the sampling element, and processes the signal to obtain the resonant frequency of the resonant tank.
In a specific embodiment, the main control element transmits the processed resonant frequency of the resonant tank to the conversion unit 3, and the conversion unit 3 obtains the corrective force corresponding to the resonant frequency according to a relationship formula between frequency and force.
In a specific embodiment, the master control chip comprises an STM32 chip, and the CPU maximum speed of the STM32 chip reaches 72 MHz.
In an embodiment, the measuring apparatus further includes a human-computer interaction interface 4, and the human-computer interaction interface 4 is connected to the signal reading unit 2 and the conversion unit 3, and is configured to display output results of the signal reading unit 2 and the conversion unit 3. The human-computer interaction interface 4 can include functions of signal real-time display, signal processing, peak detection, data storage and the like.
The sensor unit 1 and the signal reading unit 2 are connected through mutual inductance coupling between inductors, the sensor unit 1 does not need to be powered by itself, and the correcting force of the correcting device on a correcting target can be acquired in a wireless mode in real time.
The embodiment of the invention also provides a method for measuring the correcting force, which is used for measuring the correcting force of the correcting device on the correcting target, and particularly relates to fig. 3, wherein the method comprises the following steps:
and step 304, the conversion unit obtains the correcting force corresponding to the resonance frequency according to a relation formula of the frequency and the force.
Specifically, the relationship formula of the frequency and the force is obtained through a calibration experiment of the force and the frequency, and the calibration experiment specifically includes: the method comprises the steps of sequentially applying a plurality of forces with different sizes on the sensor unit, recording the resonant frequency of the sensor unit under the action of the forces with different sizes, drawing a change relation graph of the resonant frequency and the forces, and obtaining a relation formula of the frequency and the forces through fitting.
In one embodiment, the target is a tooth and the appliance is a mouthpiece. But is not limited thereto, any object to be corrected may be the correction target.
In an embodiment, the signal reading unit further includes a sweep frequency element, a sampling element and a main control element;
acquiring, by the signal reading unit, a resonant frequency of the sensor unit, including: the master control element sends a frequency sweeping instruction to the frequency sweeping element to enable the frequency sweeping element to send a frequency sweeping signal;
the frequency sweeping signal enters the second inductor and enters the first inductor through magnetic coupling, so that the resonant circuit resonates;
the sampling element collects output signals of the second inductor and transmits the collected output signals to the main control element for processing;
and the main control element processes the output signal to obtain the resonant frequency of the resonant circuit.
The sensor unit and the signal reading unit are connected through mutual inductance coupling between inductors, the sensor unit does not need to be powered by itself, and the correcting force of the correcting device on a correcting target can be acquired in a wireless mode in real time.
It should be appreciated that reference throughout this specification to "one embodiment," "some embodiments," "other embodiments," "alternative embodiments," or "a particular embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, appearances of the phrases "an embodiment," "some embodiments," "other embodiments," "alternative embodiments," or "a particular embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (1)
1. A method for measuring the correcting force generated by an corrector on a correcting target is characterized by comprising the following steps: providing a corrective force measuring device comprising: the device comprises a sensor unit, a signal reading unit and a conversion unit; the sensor unit comprises a capacitance and a first inductance; the capacitor and the first inductor form a resonant circuit, and the capacitor deforms in response to the correcting force to change the resonant frequency of the resonant circuit; the signal reading unit comprises a second inductor; the second inductor is in mutual inductance coupling with the first inductor, and the resonant frequency of the resonant loop is obtained through the second inductor;
the sensor cell size is about 5mm by 5 mm;
disposing the sensor unit between the orthosis and the orthosis target, the orthosis force acting on the sensor unit;
acquiring the resonant frequency of the sensor unit through the signal reading unit;
the conversion unit obtains the correcting force corresponding to the resonance frequency according to a relation formula of frequency and force;
wherein the orthodontic target is a tooth;
the capacitor and the first inductor are integrally formed by etching a conductive base material through laser; the capacitor and the first inductor are packaged by Polydimethylsiloxane (PDMS), wherein the capacitor and the first inductor form a capacitive pressure sensor unit; the sensitivity of the sensor unit reaches 0.11KPa under the load of 2N to 5N-1；
The conductive substrate comprises at least one of copper, gold, or silver;
the relation formula of the frequency and the force is obtained through a calibration experiment of the force and the frequency; the calibration experiment specifically comprises the following steps: sequentially applying a plurality of forces with different sizes on the sensor unit, recording the resonant frequency of the sensor unit under the action of the forces with different sizes, drawing a change relation graph of the resonant frequency and the forces, and obtaining a relation formula of the frequency and the forces through fitting;
the signal reading unit further includes: the frequency sweeping component is used for generating frequency sweeping signals, the frequency sweeping signals enter the second inductor, and the resonance of the resonance circuit is realized through magnetic coupling, wherein the frequency sweeping component adopts an AD9910 chip;
the signal reading unit further includes: the sampling element is connected with the second inductor and is used for sampling a signal on the second inductor;
the signal reading unit further includes: the main control element is connected with the sampling element and used for processing the signal output by the sampling element to obtain the resonant frequency, wherein the main control element adopts an STM32 chip;
the measuring device further includes: the human-computer interaction interface is connected with the signal reading unit and used for displaying the reading result of the signal reading unit;
acquiring, by the signal reading unit, a resonant frequency of the sensor unit, including: the master control element sends a frequency sweeping instruction to the frequency sweeping element to enable the frequency sweeping element to send a frequency sweeping signal;
the frequency sweeping signal enters the second inductor and enters the first inductor through magnetic coupling, so that the resonant circuit resonates;
the sampling element collects output signals of the second inductor and transmits the collected output signals to the main control element for processing;
and the main control element processes the output signal to obtain the resonant frequency of the resonant circuit.
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