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GB2486008A - Sensor system - Google Patents

Sensor system Download PDF

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Publication number
GB2486008A
GB2486008A GB1020336.2A GB201020336A GB2486008A GB 2486008 A GB2486008 A GB 2486008A GB 201020336 A GB201020336 A GB 201020336A GB 2486008 A GB2486008 A GB 2486008A
Authority
GB
United Kingdom
Prior art keywords
radio frequency
sensor system
sensor
energy
electrical power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB1020336.2A
Other versions
GB2486008B (en
GB201020336D0 (en
Inventor
Stephen Roberts
John Stuart Parker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Perpetuum Ltd
Original Assignee
Perpetuum Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Perpetuum Ltd filed Critical Perpetuum Ltd
Priority to GB1020336.2A priority Critical patent/GB2486008B/en
Publication of GB201020336D0 publication Critical patent/GB201020336D0/en
Publication of GB2486008A publication Critical patent/GB2486008A/en
Application granted granted Critical
Publication of GB2486008B publication Critical patent/GB2486008B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D9/00—Recording measured values
    • G01D9/005—Solid-state data loggers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0701—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management
    • G06K19/0707—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management the arrangement being capable of collecting energy from external energy sources, e.g. thermocouples, vibration, electromagnetic radiation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0716—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising a sensor or an interface to a sensor
    • G06K19/0717—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising a sensor or an interface to a sensor the sensor being capable of sensing environmental conditions such as temperature history or pressure
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J17/00—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/001—Energy harvesting or scavenging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • H04B5/0037—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2209/00—Arrangements in telecontrol or telemetry systems
    • H04Q2209/80—Arrangements in the sub-station, i.e. sensing device
    • H04Q2209/88—Providing power supply at the sub-station
    • H04Q2209/886—Providing power supply at the sub-station using energy harvesting, e.g. solar, wind or mechanical

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Theoretical Computer Science (AREA)
  • Electromagnetism (AREA)
  • Signal Processing (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

A sensor system comprises a self-powered wireless sensor node 2 including at least one sensor 4 adapted to sense one or more parameters, a non-volatile memory 14 for storing data corresponding to the sensed parameters, a wireless transmitter 26, 28 for transmitting the data to an external device 30, at least one controller 8 for controlling the operation of the at least one sensor, the memory and the wireless transmitter, a first electrical power source comprising an energy harvester 16 adapted to generate electrical energy from an environmental energy input and a second electrical power source comprising a radio frequency power supply 22 adapted to generate electrical energy from a radio frequency energy input.

Description

SENSOR SYSTEM
This invention relates to a sensor system and to a method of operating a sensor system.
In particular, this invention relates to sensor system comprising a self-powered wireless sensor node.
There are many operational and reliability benefits to being able to measure mechanical and dynamic parameters on structures such as vehicles, oil rigs, or wind turbine blades.
Wireless sensor nodes (WSN) are attractive for this purpose because they do not require to be connected, via cables, to a source of electrical power or to a communication hub.
To achieve truly wireless operation of the sensor nodes, energy harvesting is the only plausible method of powering these WSNs because battery changing is impractical due to access difficulties. Energy harvesting is the parasitic use of environmental energy, such as mechanical, thermal or solar energy, to drive a local electrical generator, for example an electromechanical generator in the case of mechanical energy with the device being connected to a moving body from which mechanical energy is parasitically taken.
Sensor systems using such energy harvesters for providing local electrical power can have indefinite operating lives because there is no constraint due to a battery life.
However, some sensor systems must be capable of transmitting their data via a wireless radio transmitter at a time when the energy harvester is not generating power. This facility can be provided by storing electrical energy locally in a capacitor, but this has practical limitations due, for example, to capacitor self-discharge.
The present invention aims to provide a sensor system, which can function as a self-powered wireless sensor node, which can reliably capture sensed data and transmit that data on demand without requiring local energy storage.
Accordingly, the present invention provides a sensor system comprising at least one sensor adapted to sense one or more parameters, a non-volatile memory for storing data corresponding to the sensed parameters, a wireless transmitter for transmitting the data to an external device, at least one controller for controlling the operation of the at least one sensor, the memory and the wireless transmitter, a first electrical power source comprising an energy harvester adapted to generate electrical energy from an environmental energy input and a second electrical power source comprising a radio frequency power supply adapted to generate electrical energy from a radio frequency energy input.
Optionally, the at least one controller is at least one microprocessor having a first sensing and recording sub-system powered by the energy harvester and a second communication sub-system powered by the radio frequency power supply.
Optionally, the first sensing and recording sub-system and the second communication sub-system are alternately enabled in dependence upon the input electrical power to the at least one controller.
Optionally, the first sensing and recording sub-system is enabled when the electrical power from the energy harvester is above a pre-set minimum threshold.
Optionally, the second communication sub-system is enabled when the electrical power from the radio frequency power supply is above a pre-set minimum threshold.
Optionally, the second communication sub-system is adapted to control at least one setting of the at least one sensor.
Optionally, the wireless transmitter and the radio frequency power supply comprise a radio frequency transponder coupled to an antenna, the transponder being activated to generate electrical power by an input radio frequency signal.
Optionally, the energy harvester and the radio frequency power supply comprise the sole sources of electrical power for the sensor system.
Optionally, the sensor system does not contain an electrical battery or storage capacitor for providing a power source for the sensor system.
Optionally, the sensor system is in combination with an external radio frequency emitter for thputting a radio frequency energy input to the radio frequency power supply.
Optionally, the external radio frequency emitter is adapted to input to the at least one controller, via the radio frequency energy input, control parameters for the at least one sensor and/or the at least one controller.
The sensor system according to the invention may comprise a vehicle data logger.
The present invention further provides a vehicle incorporating the sensor system according to the invention.
The present invention further provides a method of operating a sensor system, the method comprising the steps of: (a) sensing one or more parameters by at least one sensor; (b) storing data corresponding to the sensed parameters in a non-volatile memory; and (c) wirelessly transmitting the data to an external device; wherein steps (a) and (b) are carried out using electrical energy harvested from an environmental energy input and step (c) is carried out using electrical energy from a radio frequency energy input.
Optionally, steps (a) and (b) are carried out by a first sensing and recording operation mode of at least one controller and step (e) is carried out by a second communication operation mode of the at least one controller.
Optionally, the first sensing and recording operation mode and the second communication operation mode are alternately enabled in dependence upon the input electrical power to the at least one controller.
Optionally, the first sensing and recording operation mode is enabled when the electrical power harvested from the environmental energy input is above a pre-set minimum threshold.
Optionally, the second communication operation mode is enabled when the electrical power from the radio frequency energy input is above a pre-set minimum threshold.
The method may further comprise step (d) of controlling at least one setting of the at least one sensor, and wherein the second communication operation mode is additionally adapted to carry out step (d).
Optionally, the environmental energy input and the radio frequency energy input comprise the sole sources of electrical power for the sensor system.
The method may be for logging data of a vehicle.
Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:-FIG. 1 is a schematic diagram of a sensor system in the form of a wireless sensor node including an energy harvester in accordance with an embodiment of the invention; and FIG. 2 is a schematic diagram illustrating the principle of operation of the sensor system of Figure 1.
Referring to FIG. 1, there is shown a schematic diagram of a sensor system 2 in the form of a wireless sensor node including an energy harvester in accordance with an embodiment of the invention.
The sensor system 2 comprises at least one sensor 4. The sensor or sensors 4 may be adapted to sense one or more parameters, for example mechanical strain, mechanical stress, pressure, temperature, etc.. The output data from the sensor(s) 4 is communicated via a two-way data bus 6 to be processed by a controller 8 comprising a microprocessor 10. The microprocessor 10 is programmed to produce a numerical value for the sensed parameter(s). The or each numerical value is transmitted via a two-way data bus 12 to a storage location comprising a non-volatile memory 14.
An energy harvester 16 is electrically connected, by a power connection 18, to the microprocessor 10. The sensor system 2 is self-powered. The energy harvester 16 provides electrical power to operate the sensor 4 and microprocessor 10 during a sensing operation and during a data processing and storage operation. No battery or local storage of electrical power is provided. The energy harvester 16 is adapted parasitically to harvest environmental energy, for example mechanical, solar and br thermal energy, and convert that energy input into electrical energy. An electromechanical energy harvester such as that disclosed in WO-A-2009/1 27823 may be used.
The energy harvester 16 may be provided with power conditioning circuitry 20 to provide a desired output electrical supply, for example a direct current supply with desired power, current and voltage properties, to drive the microprocessor 10. Ideally, the energy harvester 16, of whichever type, should be maintenance free and contain no parts that wear out over an extended operational lifetime of more than 10 years at least, preferably at least 25 years.
A radio frequency energy supply 22 is additionally electrically connected, by a power connection 24, to the microprocessor 10. The radio frequency energy supply 22 comprises a low frequency radio transponder 26, coupled to an antenna 28. The radio frequency may be a frequency typically used in known RF systems, such as, for example, k±Hz or 1 MHz. The low frequency radio transponder 26 is adapted to generate electrical power, and to supply such electrical power to the microprocessor 10, when the antenna 28 receives an input wireless radio frequency signal. The input wireless radio frequency signal is received from an external or remote radio frequency transmitter 30.
The input wireless radio frequency signal also triggers the low frequency radio transponder 26 to transmit data encoded in the signal to the microprocessor 10 along a two-way data bus 32. Such data may comprise control parameters, such as sensor settings and operating instructions for the microprocessor 10. The sensor settings may be sent from the microprocessor 10 to the sensor(s) 4 along the data bus 6. Operating instructions for the microprocessor 10 may be sent along the data bus 12 to be stored in the non-volatile memory 14.
The microprocessor 10 is adapted to transmit sensor data, retrieved from the non-volatile memory 14, along the two-way data bus 32 to the low frequency radio transponder 26. In turn, the low frequency radio transponder 26 is adapted to transmit that data as a wireless radio frequency signal from the antenna 28 back to an external device, which may be a remote base station for analysis. The external device may, for example, include the radio frequency transmitter 30, and may comprise an RFID device, such as a radio frequency reader of a type generally known in the art.
By providing an energy harvester 16 and a radio frequency energy supply 22 which provide the necessary electrical power to control the sensing function, the data processing function and the data transmitting function of the sensor system which comprises a wireless sensor node, there are (i) no batteries in the sensor system, or (ii) charge storing capacitor for storing charge, to power the sensor system when the energy harvester is in a non-functional mode because of the absence of external enviromnental input energy.
Referring to FiG. 2, there is shown a schematic diagram illustrating the principle of operation of the sensor system of Figure 1.
The sensor system 2 of this invention is an autonomous sensor system which has two distinct modes of operation.
A first mode is a sensing and recording mode 40 in which the sensor(s) 4 function to detect the desired parameter(s) and the corresponding data from the sensor(s) 4 is sent along data bus 6 to the microprocessor 10 and then to the non-volatile memory 14 for storage.
A second mode is a communication and control mode 42 in which, on demand from an input signal from an external device or remote location, sensor data is retrieved from the non-volatile memory 14 along data bus 12 and then communicated wirelessly to the external device or remote location. In addition, control parameters for operating the sensor system 2 are inputted wirelessly.
Electrical power for the sensing and recording mode is provided by the energy harvester 16. Electrical power for the communication and control mode is provided by the radio frequency energy supply 22.
The sensing and recording mode 40 is entered when electrical power becomes available from the energy harvester 16. In this mode, the or each sensor 4 is interrogated and the corresponding sensor data is stored in the non-volatile memory 14. Sensor control parameters may be read from the non-volatile memory 14 which specify details of the sensor reading processes. This sensing and recording mode is exited, or terminated, either when the electrical power from the energy harvester 16 is no longer available or falls below a pre-set minimum threshold or when RE power from the radio frequency energy supply 22 becomes available or is above a pre-set minimum threshold.
The communication and control mode 42 is entered when RE power becomes available.
In this mode, the radio frequency transmitter 30, which comprises an external radio-frequency reader (REID-type) device, is used to communicate wirelessly with the sensor system 2 and provides radio frequency energy which is converted into electrical energy by the radio frequency energy supply 22. Control parameters, input in the RE signal, can be set within the non-volatile memory 14 and sensor data can be retrieved from the non-volatile memory 14 and communicated back to the external radio-frequency reader (REID-type) device. This mode is exited, or terminated, when the RE power is no longer available or falls below a pre-set minimum threshold.
Correspondingly, the microprocessor 10 is provided with two sub-systems, a first sensing and recording sub-system 34 operable in the sensing and recording mode 40, and a second communication and control sub-system 36 operable in the communication and control mode 42. Typically, the two sub-systems 34, 36 are not powered simultaneously, but they can operate simultaneously. Alternatively, two controllers arc provided in a control assembly, each controller being a respective microprocessor and having a respective sub-system 34, 36 for carrying out a respective mode 40,42..
Accordingly the non-volatile memory 14 is alternately powered from different power sources, the energy harvester 16 during the first mode 40 or the radio frequency energy supply 22 during the second mode 42, the operable mode being dependent upon whichever operable sub-system of the microprocessor 10 is currently writing or reading data into or from the non-volatile memory 14. The non-volatile memory 14 retains the data stored therein when no electrical power is present.
The sensor settings can be changed via control parameters stored in the non-volatile memory 14, and which have been communicated using the wireless communications system. The communications system is similar to existing, widely deployed RFID systems.
The sensor system of the present invention has particular application for recording, storing and transmitting data of a moving vehicle, such as an automobile or a truck. For such a data logging application of a moving vehicle, the energy harvester 16 would typically comprise a vibration harvester for providing electrical power for the sensing and recording sub-system 34 during operation of the vehicle, in which vibration energy could be harvested. When the vehicle is stationary, in which static condition the vibration harvester cannot provide electrical power, the electrical power for the communication and control mode sub-system 36 operable in the communication and control mode 42 would be provided by an RFID-type reader.
Other modifications to the various embodiments of the present invention, and applications of the sensor system, will be apparent to those skilled in the art.

Claims (21)

  1. CLAIMS: 1. A sensor system comprising at least one sensor adapted to sense one or more parameters, a non-volatile memory for storing data corresponding to the sensed parameters, a wireless transmitter for transmitting the data to an external device, at least one controller for controlling the operation of the at least one sensor, the memory and the wireless transmitter, a first electrical power source comprising an energy harvester adapted to generate electrical energy from an environmental energy input and a second electrical power source comprising a radio frequency power supply adapted to generate electrical energy from a radio frequency energy input.
  2. 2. A sensor system according to claim 1 wherein the at least one controller is at least one microprocessor having a first sensing and recording sub-system powered by the energy harvester and a second communication sub-system powered by the radio frequency power supply.
  3. 3. A sensor system according to claim 2 wherein the first sensing and recording sub-system and the second communication sub-system are alternately enabled in dependence upon the input electrical power to the at least one controller.
  4. 4. A sensor system according to claim 3 wherein the first sensing and recording sub-system is enabled when the electrical power from the energy harvester is above a pre-set minimum threshold.
  5. 5. A sensor system according to claim 3 or claim 4 wherein the second communication sub-system is enabled when the electrical power from the radio frequency power supply is above a pre-set minimum threshold.
  6. 6. A sensor system according to any one of claims 2 to 5 wherein the second communication sub-system is adapted to control at least one setting of the at least one sensor.
  7. 7. A sensor system according to any foregoing claim wherein the wireless transmitter and the radio frequency power supply comprise a radio frequency transponder coupled to an antenna, the transponder being activated to generate electrical power by an input radio frequency signal.
  8. 8. A sensor system according to any foregoing claim wherein the energy harvester and the radio frequency power supply comprise the sole sources of electrical power for the sensor system
  9. 9. A sensor system according to any foregoing claim which does not contain an electrical battery or storage capacitor for providing a power source for the sensor system.
  10. 10. A sensor system according to any foregoing claim in combination with an external radio frequency emitter for inputting a radio frequency energy input to the radio frequency power supply.
  11. 11. A sensor system according to claim 10 wherein the external radio frequency emitter is adapted to input to the at least one controller, via the radio frequency energy input, control parameters for the at least one sensor and/or the at least one controller.
  12. 12. A sensor system according to any foregoing claim which comprises a vehicle data logger.
  13. 13. A vehicle incorporating the sensor system according to any foregoing claim.
  14. 14. A method of operating a sensor system, the method comprising the steps of: (a) sensing one or more parameters by at least one sensor; (b) storing data corresponding to the sensed parameters in a non-volatile memory; and (c) wirelessly transmitting the data to an external device; wherein steps (a) and (b) are carried out using electrical energy harvested from an environmental energy input and step (c) is carried out using electrical energy from a radio frequency energy input.
  15. 15. A method according to claim 14 wherein steps (a) and (b) are carried out by a first sensing and recording operation mode of at least one controller and step (e) is carried out by a second communication operation mode of the at least one controller.
  16. 16. A method according to claim 15 wherein the first sensing and recording operation mode and the second communication operation mode are alternately enabled in dependence upon the input electrical power to the at least one controller.
  17. 17. A method according to claim 16 wherein the first sensing and recording operation mode is enabled when the electrical power harvested from the environmental energy input is above a pre-set minimum threshold.
  18. 18. A method according to claim 16 or claim 17 wherein the second communication operation mode is enabled when the electrical power from the radio frequency energy input is above a pre-set minimum threshold.
  19. 19. A method according to claim any one of claims 15 to 18 further comprising step (d) of controlling at least one setting of the at least one sensor, and wherein the second communication operation mode is additionally adapted to carry out step (d).
  20. 20. A method according to any one of claims 14 to 19 wherein the environmental energy input and the radio frequency energy input comprise the sole sources of electrical power for the sensor system.
  21. 21. A method according to any one of claims 14 to 20 for logging data of a vehicle.
GB1020336.2A 2010-12-01 2010-12-01 Sensor system Expired - Fee Related GB2486008B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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GB2486008A true GB2486008A (en) 2012-06-06
GB2486008B GB2486008B (en) 2014-04-16

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CN103974467A (en) * 2013-02-06 2014-08-06 致伸科技股份有限公司 Radio heating device and radio heating system
US9144017B2 (en) 2013-03-14 2015-09-22 Qualcomm Incorporated Systems and methods for saving power in monitoring and tracking devices
NL2012484A (en) * 2014-03-20 2015-12-10 Stichting Incas3 Sensor system, Mote and a Motes-system for sensing an environmental parameter.
EP3324512A1 (en) * 2016-11-21 2018-05-23 Kabushiki Kaisha Toshiba Power supply device, power supply system, and sensor system
EP3333777A1 (en) * 2016-12-06 2018-06-13 THOMSON Licensing Method and apparatus for harvesting an energy from a power cord
WO2018141315A1 (en) 2017-02-06 2018-08-09 Level S.R.O. Device for monitoring operation parameters of a vehicle axle

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WO2006133204A2 (en) * 2005-06-08 2006-12-14 Powercast Corporation Powering devices using rf energy harvesting
US7719416B2 (en) * 2005-09-09 2010-05-18 Microstrain, Inc. Energy harvesting, wireless structural health monitoring system
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103974467A (en) * 2013-02-06 2014-08-06 致伸科技股份有限公司 Radio heating device and radio heating system
US9144017B2 (en) 2013-03-14 2015-09-22 Qualcomm Incorporated Systems and methods for saving power in monitoring and tracking devices
NL2012484A (en) * 2014-03-20 2015-12-10 Stichting Incas3 Sensor system, Mote and a Motes-system for sensing an environmental parameter.
US9880143B2 (en) 2014-03-20 2018-01-30 Ingu Solutions Inc. Sensor system, mote and a motes-system for sensing an environmental parameter
EP3324512A1 (en) * 2016-11-21 2018-05-23 Kabushiki Kaisha Toshiba Power supply device, power supply system, and sensor system
US10263433B2 (en) 2016-11-21 2019-04-16 Kabushiki Kaisha Toshiba Power supply device, power supply system, and sensor system
EP3333777A1 (en) * 2016-12-06 2018-06-13 THOMSON Licensing Method and apparatus for harvesting an energy from a power cord
WO2018141315A1 (en) 2017-02-06 2018-08-09 Level S.R.O. Device for monitoring operation parameters of a vehicle axle

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