WO2014175200A1 - Wireless sensor system - Google Patents

Wireless sensor system Download PDF

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Publication number
WO2014175200A1
WO2014175200A1 PCT/JP2014/061129 JP2014061129W WO2014175200A1 WO 2014175200 A1 WO2014175200 A1 WO 2014175200A1 JP 2014061129 W JP2014061129 W JP 2014061129W WO 2014175200 A1 WO2014175200 A1 WO 2014175200A1
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Prior art keywords
rfid
resonator
resonance
control unit
signal
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PCT/JP2014/061129
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French (fr)
Japanese (ja)
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近藤靖浩
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株式会社村田製作所
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Priority to JP2015513738A priority Critical patent/JP6004095B2/en
Publication of WO2014175200A1 publication Critical patent/WO2014175200A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/20—Clinical contact thermometers for use with humans or animals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/32—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using change of resonant frequency of a crystal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2209/00—Arrangements in telecontrol or telemetry systems
    • H04Q2209/40—Arrangements in telecontrol or telemetry systems using a wireless architecture
    • H04Q2209/47—Arrangements in telecontrol or telemetry systems using a wireless architecture using RFID associated with sensors

Definitions

  • the present invention includes a resonance tag that generates and wirelessly transmits a resonance signal corresponding to a physical quantity of a measured part, and a reader module that receives the resonance signal and measures the physical quantity of the measured part from the frequency of the resonance signal.
  • the present invention relates to a wireless sensor system.
  • the wireless sensor system described in Patent Document 1 includes an RFID tag and a remote detection device.
  • the RFID tag includes a resonator, and a reverberation signal is generated when the resonator is excited by a transmission signal from a remote detection device.
  • the frequency of the reverberation signal is a frequency corresponding to the temperature of the measurement target part where the RFID tag is arranged.
  • the remote detection device detects the temperature of the part to be measured by receiving the reverberation signal and performing frequency analysis.
  • a plurality of RFID tags may be used.
  • each RFID tag transmits a reverberation signal.
  • the remote detection device cannot identify the reverberation signal transmitted from which RFID tag.
  • the frequency of the reverberation signal is different for each RFID tag.
  • an object of the present invention is to provide a wireless sensor system that can individually receive a reverberation signal from an RFID tag (resonance tag) without being affected by the number of RFID tags (resonance tags).
  • the wireless sensor system of the present invention includes a resonance tag and a reader module.
  • the resonance tag includes a resonator whose resonance frequency changes according to a surrounding physical quantity and an RFID.
  • the reader module includes a measurement signal receiving unit, a measurement unit, and an RFID communication control unit.
  • the measurement signal transmission / reception unit transmits an excitation signal for exciting the resonator and receives a reverberation signal based on the excitation signal.
  • the measurement unit measures a physical quantity based on the reverberation signal obtained by the measurement signal transmission / reception unit.
  • the RFID communication control unit communicates with the RFID.
  • the RFID communication control unit transmits an enabling command for enabling the resonator to the RFID. When the RFID obtains an activation command, the RFID activates resonance by the excitation signal of the resonator.
  • the resonators of all the resonance tags can be disabled in a steady state, and the resonators of the resonance tags from which the reverberation signal is acquired can be enabled at the measurement timing. Thereby, only the reverberation signal from the resonator of the resonance tag from which the reverberation signal is to be acquired can be received by the reader module.
  • the wireless sensor system of the present invention preferably has the following configuration.
  • the RFID communication control unit transmits an invalidation command for invalidating the resonator to the RFID when the resonator is valid.
  • the RFID acquires the invalidation command, the RFID invalidates the resonance caused by the excitation signal of the resonator.
  • the resonator of the resonance tag that was the measurement target can be invalidated at the specified timing. This prevents the resonator from being enabled unnecessarily long.
  • the wireless sensor system of the present invention preferably has the following configuration.
  • the RFID includes a switch circuit connected in parallel to the resonator.
  • the switch circuit is in an open state when enabled and in a conductive state when disabled.
  • the wireless sensor system of the present invention preferably has the following configuration.
  • the RFID includes a storage unit that stores an operation program of the reader module.
  • the RFID communication control unit acquires an operation program and sets operations of the RFID communication control unit, the measurement signal transmission / reception unit, and the measurement unit.
  • the reader module is operated by the operation program stored in the RFID of the resonance tag. Therefore, a general-purpose reader module can be realized for various types of resonance tags.
  • the reverberation signal from the resonance tag can be individually received, and the physical quantity such as the temperature of the measured part can be reliably measured.
  • 1 is a configuration diagram of a wireless sensor system according to a first embodiment of the present invention. It is a block diagram of the resonance tag which concerns on the 1st Embodiment of this invention. It is a flowchart of the wireless sensor system which concerns on the 1st Embodiment of this invention. It is a figure which shows the case where a human body temperature is measured using the wireless sensor system which concerns on the 1st Embodiment of this invention. It is a block diagram of the wireless sensor system which concerns on the 2nd Embodiment of this invention. It is a flowchart of the wireless sensor system which concerns on the 2nd Embodiment of this invention.
  • FIG. 1 is a configuration diagram of a wireless sensor system according to a first embodiment of the present invention.
  • FIG. 2 is a configuration diagram of the resonance tag according to the first embodiment of the present invention.
  • the wireless sensor system 10 includes a resonance tag 20 and a reader module 30.
  • the resonance tag 20 is attached to the part to be measured.
  • the reader module 30 has a shape that can be carried by a measurer, for example.
  • the resonance tag 20 includes an RFID 21, an RFID communication antenna 22, a resonator 23, and a resonator antenna 24.
  • the reader module 30 includes an RFID communication control unit 31, an RFID communication antenna 32, a measurement signal transmission / reception unit 33, a measurement signal antenna 34, a measurement unit 35, and a display unit 36.
  • the RFID 21 includes a control unit 211 and a resonance operation control unit 212.
  • the control unit 211 controls wireless communication with the outside using the RFID communication antenna 22.
  • the control unit 211 communicates with the RFID communication control unit 31 of the reader module 31 via the RFID communication antenna 22 and the RFID communication antenna 32 of the reader module 31.
  • the control unit 211 receives the operation control signal Sc from the RFID communication control unit 31.
  • the operation control signal is an enabling command Sce or an invalidating command Sci.
  • the control unit 211 transmits the RFID identification information Sinf of the RFID 21 to the RFID communication control unit 31.
  • the control unit 211 analyzes the operation control signal Sc and controls the operation of the resonance operation control unit 212.
  • the resonance operation control unit 212 activates or deactivates the resonator 23 in response to the operation control from the control unit 211.
  • the resonance operation control unit 212 is a switch circuit, and is connected in parallel to the resonator 23.
  • the resonance operation control unit 212 including such a switch circuit is opened or turned on by operation control.
  • the resonator 23 is an element whose resonance frequency changes according to the sensed temperature.
  • the resonator 23 is made of a crystal resonator.
  • the resonator 23 receives the excitation signal SpL via the resonator antenna 24, the resonator 23 resonates at a resonance frequency corresponding to the sensed temperature and generates a reverberation signal Sfp. Therefore, since the resonance tag 20 is attached to the measurement target, the resonator 23 resonates at a resonance frequency corresponding to the temperature of the measurement target, and generates a reverberation signal Sfp. That is, the frequency of the reverberation signal Sfp depends on the temperature of the part to be measured.
  • the resonator 23 may be an element whose resonance frequency changes according to a surrounding physical quantity such as magnetism or strain, not the sensed temperature.
  • the resonance tag 20 has the resonator 23 enabled by the operation control signal, and generates the reverberation signal Sfp when it receives the excitation signal SpL and transmits it from the resonator antenna 24 to the outside. To do. On the other hand, if the resonator 23 is disabled, the resonance tag 20 cannot generate the reverberation signal Sfp even if it receives the excitation signal SpL. Therefore, the resonance tag 20 does not transmit any signal from the resonator antenna 24 to the outside.
  • the RFID communication control unit 31 communicates with the control unit 211 of the RFID 21 of the resonance tag 20 via the RFID communication antenna 32 and the RFID communication antenna 22 of the resonance tag 20. Specifically, the RFID communication control unit 31 transmits an operation control signal Sc to the control unit 211 of the RFID 21. The RFID communication control unit 31 receives and demodulates the RFID identification information Sinf from the control unit 211 of the RFID 21. By this process, the RFID 21 in communication, that is, the resonance tag 20 is identified.
  • the RFID communication control unit 31 outputs the transmission information of the operation control signal Sc to the measurement signal transmission / reception unit 33.
  • the RFID communication control unit 31 outputs the acquired RFID identification information Sinf to the measurement signal transmission / reception unit 33.
  • the measurement signal transmitter / receiver 33 generates the excitation signal SpL at a preset time interval and transmits it from the measurement antenna 34.
  • the measurement signal transmitting / receiving unit 33 may generate the excitation signal SpL after detecting that the operation control signal Sc of the validation command Sce has been received. Thus, if the excitation signal SpL is generated and transmitted after receiving the detection of the validation command Sce, unnecessary transmission of the excitation signal SpL can be suppressed.
  • the measurement signal transmitting / receiving unit 33 When receiving the reverberation signal Sfp via the measurement antenna 34, the measurement signal transmitting / receiving unit 33 performs frequency analysis of the reverberation signal Sfp and acquires the frequency fp of the reverberation signal Sfp. The measurement signal transmitting / receiving unit 33 outputs the frequency fp of the reverberation signal Sfp to the measurement unit 35. The measurement signal transmission / reception unit 33 associates the RFID identification information Sinf with the frequency fp and outputs it to the measurement unit 35.
  • the measuring unit 35 stores a relationship table between the frequency fp and the temperature T in advance. When obtaining the frequency fp, the measuring unit 35 refers to the relationship table and calculates the temperature T. At this time, the measurement unit 25 can determine a relation table based on the RFID identification information Sinf, and can calculate the temperature T from the determined relation table.
  • the display unit 36 acquires and displays the temperature T calculated by the measurement unit 35. At this time, the display unit 36 may display the RFID identification information Sinf together with the temperature T. The display unit 36 can be omitted as necessary. In this case, an output terminal that outputs the temperature T and RFID identification information Sinf to the outside may be provided.
  • FIG. 3 is a flowchart of the wireless sensor system according to the first embodiment of the present invention.
  • the resonance tag 20 is attached to the measurement target part.
  • the switch circuit which is the resonance operation control unit 212 is in a conductive state, and the resonator 23 is in an invalid state (S101).
  • the reader module 30 is activated (S201). In a state where the reader module 30 is brought close to the resonance tag 20, a measurement start operation input is performed on the reader module 30. In response to the measurement start operation input, the reader module 30 transmits an validation command Sce (operation control signal Sc) (S202). Communication between the reader module 30 and the resonance tag 20 at this time is performed by, for example, so-called short-range non-contact communication.
  • Sce operation control signal Sc
  • the resonance tag 20 maintains the invalid state until the activation command Sce is received (S102: NO).
  • the resonance tag 20 receives the validation command Sce (S102: YES)
  • the resonance tag 20 switches the resonator 23 to the valid state (S103). Specifically, the switch circuit which is the resonance operation control unit 212 is opened.
  • the resonance tag 20 transmits the RFID identification information Sinf to the reader module 30.
  • the reader module 30 receives and demodulates the RFID identification information Sinf (S203).
  • the reader module 30 generates and transmits an excitation signal SpL (S204).
  • the resonator 23 of the resonance tag 10 receives the excitation signal SpL, resonates, and generates a reverberation signal Sfp (S103).
  • the reader module 30 receives the reverberation signal Sfp (S205).
  • the reader module 30 analyzes the frequency fp of the reverberation signal Sfp and measures the temperature T from the frequency fp (S206).
  • the reader module 30 transmits an invalidation command Sci (operation control signal Sc) (S207).
  • the resonance tag 20 maintains the valid state until the invalidation command Sci is received (S104: NO).
  • the resonance tag 20 switches the resonator 23 to an invalid state (S105). Specifically, the switch circuit which is the resonance operation control unit 212 is turned on.
  • the reverberation signal Sfp can be generated only by the resonance tag 10 that is the measurement target. For example, even if there are a plurality of resonance tags within a range where the excitation signal SpL of the reader module 30 can reach, only the resonance tag 10 whose resonator is enabled by RFID communication generates the reverberation signal Sfp that responds to the excitation signal SpL. Can be generated. As a result, the reverberation signals Sfp from a plurality of resonance tags can be individually acquired without changing the frequency for each resonance tag. Therefore, it is possible to reliably measure a physical quantity such as a desired temperature of the measured part.
  • the activation and invalidation of the resonator can be controlled by opening and conducting the switch circuit.
  • the resonance tag which has the above-mentioned operation effect can be realized with a simple configuration.
  • FIG. 4 is a diagram showing a case where the body temperature of a person is measured using the wireless sensor system according to the first embodiment of the present invention.
  • FIG. 4 shows an example in which only two resonance tags 20 exist for the sake of explanation.
  • the RFID communication antenna 22 and the resonance antenna 24 are each realized by forming a coil electrode on a flexible thin flexible substrate (for example, paper and PET). ing.
  • a resonator 23 is disposed at the end of the long portion 26 of the flexible substrate.
  • the resonator 23 of the resonance tag 20 is attached to the armpit 901 of the person 900 that is the test body, that is, the axilla 901.
  • the long portion 26 is wound around the upper arm 900A of the person 900 to fix the resonance tag 20 to the upper arm 900A.
  • the wireless sensor system 10 measures the deep body temperature of the person 900.
  • the winding direction is adjusted so that the surface on which the coil electrode for realizing the RFID communication antenna 22 and the resonance antenna 24 is formed is outside (outside the upper arm 900A). To do. Thereby, RFID communication and transmission / reception of the excitation signal SpL and the reverberation signal Sfp can be performed between the reader module 30 and the resonance tag 20.
  • the reader module 30 activates only the resonator 23 of the resonance tag 20 attached to the person 900 with the enable command Sce, and invalidates the resonator 23 of the resonance tag 20 attached to the person 910. Yes. Therefore, the reader module 30 does not need to change the frequency for each resonance tag 20 even when the two resonance tags 20 exist within the range where the excitation signal SpL can reach, and the reverberation signal is transmitted only from the resonance tag 20 attached to the person 900. Sfp can be acquired.
  • FIG. 5 is a configuration diagram of a wireless sensor system according to the second embodiment of the present invention.
  • the wireless sensor system 10A includes a resonance tag 20A and a reader module 30A.
  • the resonance tag 20A includes an RFID 21A, an RFID communication antenna 22, a resonator 23, and a resonator antenna 24.
  • the configuration of the RFID 21A is different from the RFID 21 according to the first embodiment, and the other configuration of the resonance tag 20A is the same as that of the resonance tag 20 according to the first embodiment.
  • the reader module 30A includes an RFID communication control unit 31A, an RFID communication antenna 32, a measurement signal transmitting / receiving unit 33, a measurement signal antenna 34, a measurement unit 35A, and a display unit 36.
  • the configuration of the RFID communication control unit 31A and the measurement unit 35A is different from the RFID communication control unit 31 and the measurement unit 35 according to the first embodiment, and the other configuration of the reader module 30A is the reader module 30 according to the first embodiment. Is the same. Therefore, only different parts will be described.
  • the RFID 21A includes a control unit 211, a resonance operation control unit 212, and a storage unit 213.
  • the basic configurations of the control unit 211 and the resonance operation control unit 212 are the same as those of the RFID 21 according to the first embodiment.
  • the storage unit 213 stores a reader module operation program.
  • the reader module operation program is, for example, a program for performing communication processing unique to the RFID 21A.
  • the program also includes a relationship table that represents the resonance frequency of the resonator of the resonance tag 20A and the temperature characteristics of the resonance frequency.
  • the RFID 21A When receiving the program read command Scr from the RFID communication control unit 31A of the reader module 30A, the RFID 21A reads the operation program from the storage unit 213 and converts it into a radio signal. The RFID 21A outputs the operation program Spro converted into a radio signal to the RFID communication unit 31A.
  • the communication protocol of the read command Scr and the operation program Spro converted into a radio signal is a general-purpose protocol that does not depend on the type of RFID, the communication of the read command Scr and the operation program Spro converted into a radio signal can be reliably performed. Can be executed.
  • the RFID communication control unit 31A transmits a read command Scr, receives the operation program Spro converted into a radio signal, and demodulates the operation program.
  • the RFID communication control unit 31A sets the operation of the RFID communication control unit 31A itself and the operation of the measurement unit 35A from the demodulated operation program.
  • the operation setting of the RFID communication control unit 31A itself is, for example, a communication protocol setting for the RFID 21A thereafter.
  • the operation setting of the measurement unit 35A is a setting of a relation table for calculating the temperature T from the frequency fp corresponding to the resonator 23 attached to the resonance tag 20A.
  • Measure unit 35A measures temperature T based on the setting by the operation program. Specifically, the measurement unit 35A calculates the temperature T from the relationship table set by the operation program and the frequency fp analyzed by the measurement signal transmission / reception unit 33.
  • FIG. 6 is a flowchart of the wireless sensor system according to the second embodiment of the present invention.
  • the flow of the wireless sensor system 10A of the present embodiment is the same as the flowchart of the wireless sensor system according to the first embodiment after the process of transmitting the validation command Sce.
  • the same step numbers are given to the same processing portions as those in the flowchart of the wireless sensor system according to the first embodiment, and the description of the same processing portions is omitted.
  • the reader module 30A is activated (S201). In a state where the reader module 30A is brought close to the resonance tag 20A, a read command Scr is transmitted to the resonance tag 20A (S221).
  • the resonance tag 20A When the resonance tag 20A receives the read command Scr (S121), the resonance tag 20A transmits the operation program Spro to the reader module 30A (S122). When receiving the operation program Spro (S222), the reader module 30A demodulates and develops the operation program Spro (S223). In the following, measurement processing is performed as in the first embodiment.
  • the reader module can reliably communicate for each resonance tag even if the communication specifications and the like are different for each resonance tag. That is, the reader module can be generalized. In addition, by including the relation table in the operation program Spro, the physical quantity can be accurately measured regardless of which resonance tag is used.

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  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
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Abstract

An objective of the present invention is to reliably identify and receive a reverberation signal from each resonance tag without being affected by the number of resonance tags. A resonance tag (20) comprises an RFID (21), and a resonator (23). A reader module (30) comprises an RFID communication control unit (31), and a measurement signal transceiver unit (33). The resonator (23) is normally neutralized by the RFID (21). The RFID communication control unit (31) transmits an operation control signal (Sc) for an activation command (Sce) to the RFID (21). Upon receiving the activation command (Sce), the RFID (21) activates the resonator (23). The measurement signal transceiver unit (33) transmits an excitation signal (SpL). The resonator (23) receives the excitation signal (SpL) and resonates at a resonance frequency according to a physical quantity in the vicinity thereof and transmits a reverberation signal (Sfp). The measurement signal transceiver unit (33) receives the reverberation signal (Sfp).

Description

無線式センサシステムWireless sensor system
　本発明は、被計測部の物理量に応じた共振信号を発生し無線送信する共振タグと、該共振信号を受信して該共振信号の周波数から被測定部の物理量を計測するリーダモジュールとを備える無線式センサシステムに関する。 The present invention includes a resonance tag that generates and wirelessly transmits a resonance signal corresponding to a physical quantity of a measured part, and a reader module that receives the resonance signal and measures the physical quantity of the measured part from the frequency of the resonance signal. The present invention relates to a wireless sensor system.
　従来、無線を利用して被計測部の物理量を検出する無線式センサシステムが各種考案されている。例えば、特許文献１に記載の無線式センサシステムでは、ＲＦＩＤタグと遠隔検知装置とを備える。 Conventionally, various wireless sensor systems have been devised that detect the physical quantity of a measurement target part using radio. For example, the wireless sensor system described in Patent Document 1 includes an RFID tag and a remote detection device.
　ＲＦＩＤタグは、共振子を備えており、遠隔検知装置からの送信信号で共振子が励振して残響信号を発生する。残響信号の周波数は、ＲＦＩＤタグが配置されている被計測部の温度に応じた周波数である。遠隔検知装置は、残響信号を受信して周波数解析することで、被計測部の温度を検知している。 The RFID tag includes a resonator, and a reverberation signal is generated when the resonator is excited by a transmission signal from a remote detection device. The frequency of the reverberation signal is a frequency corresponding to the temperature of the measurement target part where the RFID tag is arranged. The remote detection device detects the temperature of the part to be measured by receiving the reverberation signal and performing frequency analysis.
　このような無線式センサシステムでは、ＲＦＩＤタグを複数用いる場合がある。この場合、複数のＲＦＩＤタグへ同時に励振用の送信信号が送信されると、各ＲＦＩＤタグは、それぞれに残響信号を送信する。各ＲＦＩＤタグの残響信号が同じ周波数であると、遠隔検知装置は、いずれのＲＦＩＤタグから送信された残響信号であるか識別できない。 In such a wireless sensor system, a plurality of RFID tags may be used. In this case, when a transmission signal for excitation is transmitted to a plurality of RFID tags at the same time, each RFID tag transmits a reverberation signal. When the reverberation signal of each RFID tag has the same frequency, the remote detection device cannot identify the reverberation signal transmitted from which RFID tag.
　したがって、特許文献１に記載の無線式センサシステムでは、残響信号の周波数を、ＲＦＩＤタグ毎に異ならせている。 Therefore, in the wireless sensor system described in Patent Document 1, the frequency of the reverberation signal is different for each RFID tag.
特開２０１１－１８０７９９号公報JP 2011-180799 A
　しかしながら、特許文献１に記載の無線式センサシステムでは、ＲＦＩＤタグ毎に周波数を異ならせなければならないため、ＲＦＩＤタグの個数が多くなるほど、通信する周波数帯域が広くなる。このような周波数帯域に対応するには、広い周波数帯域で利得の高いアンテナや、広い周波数帯域をカバーするための複数のアンテナを用意しなければならない。これにより、遠隔検知装置が大型化したり、高コスト化してしまい、現実的な利用は容易ではない。 However, in the wireless sensor system described in Patent Document 1, since the frequency must be different for each RFID tag, the frequency band for communication becomes wider as the number of RFID tags increases. In order to cope with such a frequency band, an antenna having a high gain in a wide frequency band and a plurality of antennas for covering a wide frequency band must be prepared. As a result, the remote sensing device becomes large or expensive, and practical use is not easy.
　したがって、本発明の目的は、ＲＦＩＤタグ（共振タグ）の個数に影響されず、個別にＲＦＩＤタグ（共振タグ）からの残響信号を受信することができる無線式センサシステムを提供することにある。 Therefore, an object of the present invention is to provide a wireless sensor system that can individually receive a reverberation signal from an RFID tag (resonance tag) without being affected by the number of RFID tags (resonance tags).
　この発明の無線式センサシステムは、共振タグとリーダモジュールを備える。共振タグは、周囲の物理量に応じて共振周波数が変化する共振子およびＲＦＩＤを備える。リーダモジュールは、計測用信号受信部、計測部、およびＲＦＩＤ通信制御部を備える。計測用信号送受信部は、共振子を励振する励振信号を送信し、該励振信号に基づく残響信号を受信する。計測部は、計測用信号送受信部で得た残響信号に基づいて物理量の計測を行う。ＲＦＩＤ通信制御部は、ＲＦＩＤと通信を行う。ＲＦＩＤ通信制御部は、共振子を有効にする有効化コマンドを、ＲＦＩＤに送信する。ＲＦＩＤは、有効化コマンドを取得すると、共振子の励振信号による共振を有効化する。 The wireless sensor system of the present invention includes a resonance tag and a reader module. The resonance tag includes a resonator whose resonance frequency changes according to a surrounding physical quantity and an RFID. The reader module includes a measurement signal receiving unit, a measurement unit, and an RFID communication control unit. The measurement signal transmission / reception unit transmits an excitation signal for exciting the resonator and receives a reverberation signal based on the excitation signal. The measurement unit measures a physical quantity based on the reverberation signal obtained by the measurement signal transmission / reception unit. The RFID communication control unit communicates with the RFID. The RFID communication control unit transmits an enabling command for enabling the resonator to the RFID. When the RFID obtains an activation command, the RFID activates resonance by the excitation signal of the resonator.
　この構成では、定常的には全ての共振タグの共振子を無効化しておき、計測のタイミングで、残響信号の取得対象となる共振タグの共振子を有効化することができる。これにより、残響信号の取得対象となる共振タグの共振子からの残響信号のみを、リーダモジュールで受信することができる。 In this configuration, the resonators of all the resonance tags can be disabled in a steady state, and the resonators of the resonance tags from which the reverberation signal is acquired can be enabled at the measurement timing. Thereby, only the reverberation signal from the resonator of the resonance tag from which the reverberation signal is to be acquired can be received by the reader module.
　また、この発明の無線式センサシステムでは、次の構成であることが好ましい。ＲＦＩＤ通信制御部は、共振子が有効化されている時に、共振子を無効にする無効化コマンドを、ＲＦＩＤに送信する。ＲＦＩＤは、無効化コマンドを取得すると、共振子の励振信号による共振を無効化する。 Also, the wireless sensor system of the present invention preferably has the following configuration. The RFID communication control unit transmits an invalidation command for invalidating the resonator to the RFID when the resonator is valid. When the RFID acquires the invalidation command, the RFID invalidates the resonance caused by the excitation signal of the resonator.
　この構成では、計測対象であった共振タグの共振子を指定したタイミングで無効化できる。これにより、不必要に長く共振子が有効化されない。 In this configuration, the resonator of the resonance tag that was the measurement target can be invalidated at the specified timing. This prevents the resonator from being enabled unnecessarily long.
　また、この発明の無線式センサシステムでは、次の構成であることが好ましい。ＲＦＩＤは、共振子に並列接続されたスイッチ回路を備える。スイッチ回路は、有効化されている時に開放状態であり、無効化されている時に導通状態である。 Also, the wireless sensor system of the present invention preferably has the following configuration. The RFID includes a switch circuit connected in parallel to the resonator. The switch circuit is in an open state when enabled and in a conductive state when disabled.
　この構成では、共振子の有効化と無効化の切り替えを、簡素な回路構成で実現することができる。 In this configuration, switching between enabling and disabling of the resonator can be realized with a simple circuit configuration.
　また、この発明の無線式センサシステムでは、次の構成であることが好ましい。ＲＦＩＤは、リーダモジュールの動作プログラムを記憶する記憶部を備える。ＲＦＩＤ通信制御部は、動作プログラムを取得して、ＲＦＩＤ通信制御部、計測用信号送受信部および計測部の動作を設定する。 Also, the wireless sensor system of the present invention preferably has the following configuration. The RFID includes a storage unit that stores an operation program of the reader module. The RFID communication control unit acquires an operation program and sets operations of the RFID communication control unit, the measurement signal transmission / reception unit, and the measurement unit.
　この構成では、リーダモジュールは、共振タグのＲＦＩＤに記憶された動作プログラムによって、リーダモジュールが動作する。したがって、各種の共振タグに対して汎用なリーダモジュールを実現することができる。 In this configuration, the reader module is operated by the operation program stored in the RFID of the resonance tag. Therefore, a general-purpose reader module can be realized for various types of resonance tags.
　この発明によれば、共振タグからの残響信号を個別に受信することができ、被計測部の温度等の物理量を確実に計測することができる。 According to the present invention, the reverberation signal from the resonance tag can be individually received, and the physical quantity such as the temperature of the measured part can be reliably measured.
本発明の第１の実施形態に係る無線式センサシステムの構成図である。1 is a configuration diagram of a wireless sensor system according to a first embodiment of the present invention. 本発明の第１の実施形態に係る共振タグの構成図である。It is a block diagram of the resonance tag which concerns on the 1st Embodiment of this invention. 本発明の第１の実施形態に係る無線式センサシステムのフローチャートである。It is a flowchart of the wireless sensor system which concerns on the 1st Embodiment of this invention. 本発明の第１の実施形態に係る無線式センサシステムを用いて人の体温を測定する場合を示す図であるIt is a figure which shows the case where a human body temperature is measured using the wireless sensor system which concerns on the 1st Embodiment of this invention. 本発明の第２の実施形態に係る無線式センサシステムの構成図である。It is a block diagram of the wireless sensor system which concerns on the 2nd Embodiment of this invention. 本発明の第２の実施形態に係る無線式センサシステムのフローチャートである。It is a flowchart of the wireless sensor system which concerns on the 2nd Embodiment of this invention.
　本発明の第１の実施形態に係る無線式センサシステムについて、図を参照して説明する。図１は本発明の第１の実施形態に係る無線式センサシステムの構成図である。図２は本発明の第１の実施形態に係る共振タグの構成図である。 The wireless sensor system according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a wireless sensor system according to a first embodiment of the present invention. FIG. 2 is a configuration diagram of the resonance tag according to the first embodiment of the present invention.
　無線式センサシステム１０は、共振タグ２０とリーダモジュール３０を備える。共振タグ２０は、被計測部に装着されている。リーダモジュール３０は、例えば、計測者が持ち運び可能な形状からなる。 The wireless sensor system 10 includes a resonance tag 20 and a reader module 30. The resonance tag 20 is attached to the part to be measured. The reader module 30 has a shape that can be carried by a measurer, for example.
　共振タグ２０は、図１、図２に示すように、ＲＦＩＤ２１、ＲＦＩＤ通信用アンテナ２２、共振子２３、および、共振子用アンテナ２４を備える。リーダモジュール３０は、ＲＦＩＤ通信制御部３１、ＲＦＩＤ通信用アンテナ３２、計測用信号送受信部３３、計測信号用アンテナ３４、計測部３５、および表示部３６を備える。 As shown in FIGS. 1 and 2, the resonance tag 20 includes an RFID 21, an RFID communication antenna 22, a resonator 23, and a resonator antenna 24. The reader module 30 includes an RFID communication control unit 31, an RFID communication antenna 32, a measurement signal transmission / reception unit 33, a measurement signal antenna 34, a measurement unit 35, and a display unit 36.
　（共振タグ２０の構成）
　ＲＦＩＤ２１は、制御部２１１、および共振動作制御部２１２を備える。 (Configuration of resonance tag 20)
The RFID 21 includes a control unit 211 and a resonance operation control unit 212.
　制御部２１１は、ＲＦＩＤ通信用アンテナ２２を用いた外部との無線通信を制御する。制御部２１１は、ＲＦＩＤ通信用アンテナ２２、リーダモジュール３１のＲＦＩＤ通信用アンテナ３２を介して、リーダモジュール３１のＲＦＩＤ通信制御部３１と通信を行う。具体的には、制御部２１１は、ＲＦＩＤ通信制御部３１からの動作制御信号Ｓｃを受信する。動作制御信号は有効化コマンドＳｃｅもしくは無効化コマンドＳｃｉである。制御部２１１は、ＲＦＩＤ２１のＲＦＩＤ識別情報Ｓｉｎｆを、ＲＦＩＤ通信制御部３１に送信する。制御部２１１は、動作制御信号Ｓｃを解析して、共振動作制御部２１２の動作制御を行う。 The control unit 211 controls wireless communication with the outside using the RFID communication antenna 22. The control unit 211 communicates with the RFID communication control unit 31 of the reader module 31 via the RFID communication antenna 22 and the RFID communication antenna 32 of the reader module 31. Specifically, the control unit 211 receives the operation control signal Sc from the RFID communication control unit 31. The operation control signal is an enabling command Sce or an invalidating command Sci. The control unit 211 transmits the RFID identification information Sinf of the RFID 21 to the RFID communication control unit 31. The control unit 211 analyzes the operation control signal Sc and controls the operation of the resonance operation control unit 212.
　共振動作制御部２１２は、制御部２１１からの動作制御を受けて、共振子２３を有効化もしくは無効化させる。共振動作制御部２１２は、具体的には、図２に示すように、スイッチ回路であり、共振子２３に並列接続されている。このようなスイッチ回路からなる共振動作制御部２１２は、動作制御によって開放または導通する。 The resonance operation control unit 212 activates or deactivates the resonator 23 in response to the operation control from the control unit 211. Specifically, as shown in FIG. 2, the resonance operation control unit 212 is a switch circuit, and is connected in parallel to the resonator 23. The resonance operation control unit 212 including such a switch circuit is opened or turned on by operation control.
　共振子２３は、感知温度に応じて共振周波数が変化する素子である。例えば、共振子２３は水晶振動子からなる。共振子２３は、共振子用アンテナ２４を介して励振信号ＳｐＬを受けると、感知温度に応じた共振周波数で共振し、残響信号Ｓｆｐを発生する。したがって、共振タグ２０が被計測部に装着されているので、共振子２３は、被計測部の温度に応じた共振周波数で共振し、残響信号Ｓｆｐを発生する。すなわち、残響信号Ｓｆｐの周波数は、被測定部の温度に依存する。なお、共振子２３は、感知温度ではなく、磁気や歪み等といった周囲の物理量に応じて共振周波数が変化する素子であってもよい。 The resonator 23 is an element whose resonance frequency changes according to the sensed temperature. For example, the resonator 23 is made of a crystal resonator. When the resonator 23 receives the excitation signal SpL via the resonator antenna 24, the resonator 23 resonates at a resonance frequency corresponding to the sensed temperature and generates a reverberation signal Sfp. Therefore, since the resonance tag 20 is attached to the measurement target, the resonator 23 resonates at a resonance frequency corresponding to the temperature of the measurement target, and generates a reverberation signal Sfp. That is, the frequency of the reverberation signal Sfp depends on the temperature of the part to be measured. Note that the resonator 23 may be an element whose resonance frequency changes according to a surrounding physical quantity such as magnetism or strain, not the sensed temperature.
　このような構成により、共振タグ２０は、動作制御信号によって共振子２３が有効化されており、励振信号ＳｐＬを受けた時に、残響信号Ｓｆｐを発生して、共振子用アンテナ２４から外部へ送信する。一方、共振タグ２０は、共振子２３が無効化されていると、励振信号ＳｐＬを受けても、残響信号Ｓｆｐを発生できない。したがって、共振タグ２０は、共振子用アンテナ２４から外部に、全く信号を送信しない。 With such a configuration, the resonance tag 20 has the resonator 23 enabled by the operation control signal, and generates the reverberation signal Sfp when it receives the excitation signal SpL and transmits it from the resonator antenna 24 to the outside. To do. On the other hand, if the resonator 23 is disabled, the resonance tag 20 cannot generate the reverberation signal Sfp even if it receives the excitation signal SpL. Therefore, the resonance tag 20 does not transmit any signal from the resonator antenna 24 to the outside.
　（リーダモジュール３０の構成）
　ＲＦＩＤ通信制御部３１は、ＲＦＩＤ通信用アンテナ３２、共振タグ２０のＲＦＩＤ通信用アンテナ２２を介して、共振タグ２０のＲＦＩＤ２１の制御部２１１と通信を行う。具体的には、ＲＦＩＤ通信制御部３１は、ＲＦＩＤ２１の制御部２１１に動作制御信号Ｓｃを送信する。ＲＦＩＤ通信制御部３１は、ＲＦＩＤ２１の制御部２１１からのＲＦＩＤ識別情報Ｓｉｎｆを受信して復調する。この処理により、通信中のＲＦＩＤ２１すなわち共振タグ２０を識別する。 (Configuration of reader module 30)
The RFID communication control unit 31 communicates with the control unit 211 of the RFID 21 of the resonance tag 20 via the RFID communication antenna 32 and the RFID communication antenna 22 of the resonance tag 20. Specifically, the RFID communication control unit 31 transmits an operation control signal Sc to the control unit 211 of the RFID 21. The RFID communication control unit 31 receives and demodulates the RFID identification information Sinf from the control unit 211 of the RFID 21. By this process, the RFID 21 in communication, that is, the resonance tag 20 is identified.
　ＲＦＩＤ通信制御部３１は、動作制御信号Ｓｃの送信情報を、計測用信号送受信部３３に出力する。ＲＦＩＤ通信制御部３１は、取得したＲＦＩＤ識別情報Ｓｉｎｆを、計測用信号送受信部３３に出力する。 The RFID communication control unit 31 outputs the transmission information of the operation control signal Sc to the measurement signal transmission / reception unit 33. The RFID communication control unit 31 outputs the acquired RFID identification information Sinf to the measurement signal transmission / reception unit 33.
　計測用信号送受信部３３は、励振信号ＳｐＬを、予め設定した時間間隔で生成して、計測用アンテナ３４から送信する。なお、計測用信号送受信部３３は、有効化コマンドＳｃｅの動作制御信号Ｓｃを受信したことを検知してから、励振信号ＳｐＬを生成してもよい。このように、有効化コマンドＳｃｅの検出を受けてから励振信号ＳｐＬを生成、送信すれば、励振信号ＳｐＬの不要な送信を抑制することができる。 The measurement signal transmitter / receiver 33 generates the excitation signal SpL at a preset time interval and transmits it from the measurement antenna 34. The measurement signal transmitting / receiving unit 33 may generate the excitation signal SpL after detecting that the operation control signal Sc of the validation command Sce has been received. Thus, if the excitation signal SpL is generated and transmitted after receiving the detection of the validation command Sce, unnecessary transmission of the excitation signal SpL can be suppressed.
　計測用信号送受信部３３は、計測用アンテナ３４を介して残響信号Ｓｆｐを受信すると、残響信号Ｓｆｐの周波数解析を実行し、残響信号Ｓｆｐの周波数ｆｐを取得する。計測用信号送受信部３３は、残響信号Ｓｆｐの周波数ｆｐを計測部３５に出力する。計測用信号送受信部３３は、ＲＦＩＤ識別情報Ｓｉｎｆを周波数ｆｐに関連付けして、計測部３５に出力する。 When receiving the reverberation signal Sfp via the measurement antenna 34, the measurement signal transmitting / receiving unit 33 performs frequency analysis of the reverberation signal Sfp and acquires the frequency fp of the reverberation signal Sfp. The measurement signal transmitting / receiving unit 33 outputs the frequency fp of the reverberation signal Sfp to the measurement unit 35. The measurement signal transmission / reception unit 33 associates the RFID identification information Sinf with the frequency fp and outputs it to the measurement unit 35.
　計測部３５は、周波数ｆｐと温度Ｔとの関係テーブルを予め記憶している。計測部３５は、周波数ｆｐを取得すると、関係テーブルを参照して、温度Ｔを算出する。この際、計測部２５は、ＲＦＩＤ識別情報Ｓｉｎｆに基づいて関係テーブルを決定し、当該決定した関係テーブルから、温度Ｔを算出することもできる。 The measuring unit 35 stores a relationship table between the frequency fp and the temperature T in advance. When obtaining the frequency fp, the measuring unit 35 refers to the relationship table and calculates the temperature T. At this time, the measurement unit 25 can determine a relation table based on the RFID identification information Sinf, and can calculate the temperature T from the determined relation table.
　表示部３６は、計測部３５で算出された温度Ｔを取得して表示する。この際、表示部３６は、ＲＦＩＤ識別情報Ｓｉｎｆを温度Ｔと一緒に表示してもよい。なお、表示部３６は、必要に応じて省略することもできる。この場合、温度ＴやＲＦＩＤ識別情報Ｓｉｎｆを外部出力する出力端子を備えればよい。 The display unit 36 acquires and displays the temperature T calculated by the measurement unit 35. At this time, the display unit 36 may display the RFID identification information Sinf together with the temperature T. The display unit 36 can be omitted as necessary. In this case, an output terminal that outputs the temperature T and RFID identification information Sinf to the outside may be provided.
　このような構成からなる無線式センサシステム１０は、次に示すフローによって、被計測部の温度Ｔを計測する。図３は、本発明の第１の実施形態に係る無線式センサシステムのフローチャートである。 The wireless sensor system 10 having such a configuration measures the temperature T of the measurement target part according to the following flow. FIG. 3 is a flowchart of the wireless sensor system according to the first embodiment of the present invention.
　共振タグ２０を被計測部に装着しておく。この状態では、共振動作制御部２１２であるスイッチ回路は導通状態であり、共振子２３は無効状態である（Ｓ１０１）。 The resonance tag 20 is attached to the measurement target part. In this state, the switch circuit which is the resonance operation control unit 212 is in a conductive state, and the resonator 23 is in an invalid state (S101).
　リーダモジュール３０を起動する（Ｓ２０１）。リーダモジュール３０を共振タグ２０に近接させた状態で、リーダモジュール３０に対して計測開始操作入力を行う。この計測開始操作入力により、リーダモジュール３０は、有効化コマンドＳｃｅ（動作制御信号Ｓｃ）を送信する（Ｓ２０２）。この際のリーダモジュール３０と共振タグ２０との通信は、例えば、所謂、近距離非接触通信で行われる。 The reader module 30 is activated (S201). In a state where the reader module 30 is brought close to the resonance tag 20, a measurement start operation input is performed on the reader module 30. In response to the measurement start operation input, the reader module 30 transmits an validation command Sce (operation control signal Sc) (S202). Communication between the reader module 30 and the resonance tag 20 at this time is performed by, for example, so-called short-range non-contact communication.
　共振タグ２０は、有効化コマンドＳｃｅを受信するまでは、無効状態を維持する（Ｓ１０２：ＮＯ）。共振タグ２０は、有効化コマンドＳｃｅを受信すると（Ｓ１０２：ＹＥＳ）、共振子２３を有効状態に切り替える（Ｓ１０３）。具体的には、共振動作制御部２１２であるスイッチ回路を開放状態にする。 The resonance tag 20 maintains the invalid state until the activation command Sce is received (S102: NO). When the resonance tag 20 receives the validation command Sce (S102: YES), the resonance tag 20 switches the resonator 23 to the valid state (S103). Specifically, the switch circuit which is the resonance operation control unit 212 is opened.
　この際、共振タグ２０は、ＲＦＩＤ識別情報Ｓｉｎｆをリーダモジュール３０に送信する。リーダモジュール３０は、ＲＦＩＤ識別情報Ｓｉｎｆを受信して復調する（Ｓ２０３）。 At this time, the resonance tag 20 transmits the RFID identification information Sinf to the reader module 30. The reader module 30 receives and demodulates the RFID identification information Sinf (S203).
　リーダモジュール３０は、励振信号ＳｐＬを生成して送信する（Ｓ２０４）。共振タグ１０の共振子２３は、励振信号ＳｐＬを受けて共振し、残響信号Ｓｆｐを発生する（Ｓ１０３）。 The reader module 30 generates and transmits an excitation signal SpL (S204). The resonator 23 of the resonance tag 10 receives the excitation signal SpL, resonates, and generates a reverberation signal Sfp (S103).
　リーダモジュール３０は、残響信号Ｓｆｐを受信する（Ｓ２０５）。リーダモジュール３０は、残響信号Ｓｆｐの周波数ｆｐを解析して、当該周波数ｆｐから温度Ｔを計測する（Ｓ２０６）。 The reader module 30 receives the reverberation signal Sfp (S205). The reader module 30 analyzes the frequency fp of the reverberation signal Sfp and measures the temperature T from the frequency fp (S206).
　リーダモジュール３０は、無効化コマンドＳｃｉ（動作制御信号Ｓｃ）を送信する（Ｓ２０７）。 The reader module 30 transmits an invalidation command Sci (operation control signal Sc) (S207).
　共振タグ２０は、無効化コマンドＳｃｉを受信するまでは、有効状態を維持する（Ｓ１０４：ＮＯ）。共振タグ２０は、無効化コマンドＳｃｉを受信すると（Ｓ１０４：ＹＥＳ）、共振子２３を無効状態に切り替える（Ｓ１０５）。具体的には、共振動作制御部２１２であるスイッチ回路を導通状態にする。 The resonance tag 20 maintains the valid state until the invalidation command Sci is received (S104: NO). When the resonance tag 20 receives the invalidation command Sci (S104: YES), the resonance tag 20 switches the resonator 23 to an invalid state (S105). Specifically, the switch circuit which is the resonance operation control unit 212 is turned on.
　このような構成および処理を行うことで、計測対象である共振タグ１０のみで残響信号Ｓｆｐを発生させることができる。例えば、リーダモジュール３０の励振信号ＳｐＬが届く範囲に複数の共振タグが存在していても、ＲＦＩＤ通信により共振子が有効化された共振タグ１０のみが、励振信号ＳｐＬに応答する残響信号Ｓｆｐを発生することができる。これにより、共振タグ毎に周波数を異ならせなくても、複数の共振タグからの残響信号Ｓｆｐを個別に取得することができる。したがって、所望とする被計測部の温度等の物理量を確実に計測することができる。 By performing such configuration and processing, the reverberation signal Sfp can be generated only by the resonance tag 10 that is the measurement target. For example, even if there are a plurality of resonance tags within a range where the excitation signal SpL of the reader module 30 can reach, only the resonance tag 10 whose resonator is enabled by RFID communication generates the reverberation signal Sfp that responds to the excitation signal SpL. Can be generated. As a result, the reverberation signals Sfp from a plurality of resonance tags can be individually acquired without changing the frequency for each resonance tag. Therefore, it is possible to reliably measure a physical quantity such as a desired temperature of the measured part.
　また、本実施形態の構成および処理を用いれば、共振子の有効化、無効化を、スイッチ回路の開放、導通で制御することができる。これにより、上述の作用効果を奏する共振タグを、簡素な構成によって実現することができる。 Also, if the configuration and processing of this embodiment are used, the activation and invalidation of the resonator can be controlled by opening and conducting the switch circuit. Thereby, the resonance tag which has the above-mentioned operation effect can be realized with a simple configuration.
　本実施形態では、共振タグ２０を小型化できるため、無線式センサシステム１０を以下のように用いることができる。図４は、本発明の第１の実施形態に係る無線式センサシステムを用いて人の体温を測定する場合を示す図である。ただし、図４は、説明のために、共振タグ２０が２つのみ存在する例を示している。 In this embodiment, since the resonance tag 20 can be reduced in size, the wireless sensor system 10 can be used as follows. FIG. 4 is a diagram showing a case where the body temperature of a person is measured using the wireless sensor system according to the first embodiment of the present invention. However, FIG. 4 shows an example in which only two resonance tags 20 exist for the sake of explanation.
　図４に示すように、ＲＦＩＤ通信用アンテナ２２、及び共振用アンテナ２４は、可撓性を有する薄型のフレキシブル基板（例えば紙及びＰＥＴ等）上にコイル電極が形成されることにより、それぞれ実現されている。当該フレキシブル基板の長尺部２６の端部には共振子２３が配置されている。 As shown in FIG. 4, the RFID communication antenna 22 and the resonance antenna 24 are each realized by forming a coil electrode on a flexible thin flexible substrate (for example, paper and PET). ing. A resonator 23 is disposed at the end of the long portion 26 of the flexible substrate.
　人の体温を測定するときには、まず、共振タグ２０の共振子２３を、被検温体である人９００の腋の下、すなわち腋窩９０１に装着する。次に、長尺部２６を人９００の上腕９００Ａに巻き付けて共振タグ２０を上腕９００Ａに固定する。これにより、無線式センサシステム１０は、人９００の深部体温を測定する。 When measuring the body temperature of a person, first, the resonator 23 of the resonance tag 20 is attached to the armpit 901 of the person 900 that is the test body, that is, the axilla 901. Next, the long portion 26 is wound around the upper arm 900A of the person 900 to fix the resonance tag 20 to the upper arm 900A. Thereby, the wireless sensor system 10 measures the deep body temperature of the person 900.
　長尺部２６を上腕９００Ａに巻き付ける際、ＲＦＩＤ通信用アンテナ２２、及び共振用アンテナ２４を実現するコイル電極を形成した面が外側（上腕９００Ａに対しての外側）になるように巻き付け方向を調整する。これにより、リーダモジュール３０と共振タグ２０との間で、ＲＦＩＤ通信、並びに、励振信号ＳｐＬ及び残響信号Ｓｆｐの送受信が可能となる。 When winding the long portion 26 around the upper arm 900A, the winding direction is adjusted so that the surface on which the coil electrode for realizing the RFID communication antenna 22 and the resonance antenna 24 is formed is outside (outside the upper arm 900A). To do. Thereby, RFID communication and transmission / reception of the excitation signal SpL and the reverberation signal Sfp can be performed between the reader module 30 and the resonance tag 20.
　図４に示す例では、リーダモジュール３０は、人９００に装着した共振タグ２０の共振子２３のみを有効化コマンドＳｃｅで有効化し、人９１０に装着した共振タグ２０の共振子２３を無効化している。従って、リーダモジュール３０は、励振信号ＳｐＬが届く範囲に２つの共振タグ２０が存在する場合でも、共振タグ２０毎に周波数を異ならせる必要がなく、人９００に装着した共振タグ２０のみから残響信号Ｓｆｐを取得することができる。 In the example shown in FIG. 4, the reader module 30 activates only the resonator 23 of the resonance tag 20 attached to the person 900 with the enable command Sce, and invalidates the resonator 23 of the resonance tag 20 attached to the person 910. Yes. Therefore, the reader module 30 does not need to change the frequency for each resonance tag 20 even when the two resonance tags 20 exist within the range where the excitation signal SpL can reach, and the reverberation signal is transmitted only from the resonance tag 20 attached to the person 900. Sfp can be acquired.
　次に、本発明の第２の実施形態に係る無線式センサシステムについて、図を参照して説明する。図５は本発明の第２の実施形態に係る無線式センサシステムの構成図である。 Next, a wireless sensor system according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a configuration diagram of a wireless sensor system according to the second embodiment of the present invention.
　本実施形態に係る無線式センサシステム１０Ａは、共振タグ２０Ａとリーダモジュール３０Ａを備える。共振タグ２０Ａは、ＲＦＩＤ２１Ａ、ＲＦＩＤ通信用アンテナ２２、共振子２３、共振子用アンテナ２４を備える。ＲＦＩＤ２１Ａの構成が、第１の実施形態に係るＲＦＩＤ２１と異なり、共振タグ２０Ａの他の構成は第１の実施形態に係る共振タグ２０と同じである。リーダモジュール３０Ａは、ＲＦＩＤ通信制御部３１Ａ、ＲＦＩＤ通信用アンテナ３２、計測用信号送受信部３３、計測信号用アンテナ３４、計測部３５Ａ、および表示部３６を備える。ＲＦＩＤ通信制御部３１Ａ、計測部３５Ａの構成が、第１の実施形態に係るＲＦＩＤ通信制御部３１、計測部３５と異なり、リーダモジュール３０Ａの他の構成は第１の実施形態に係るリーダモジュール３０と同じである。したがって、異なる箇所のみを説明する。 The wireless sensor system 10A according to the present embodiment includes a resonance tag 20A and a reader module 30A. The resonance tag 20A includes an RFID 21A, an RFID communication antenna 22, a resonator 23, and a resonator antenna 24. The configuration of the RFID 21A is different from the RFID 21 according to the first embodiment, and the other configuration of the resonance tag 20A is the same as that of the resonance tag 20 according to the first embodiment. The reader module 30A includes an RFID communication control unit 31A, an RFID communication antenna 32, a measurement signal transmitting / receiving unit 33, a measurement signal antenna 34, a measurement unit 35A, and a display unit 36. The configuration of the RFID communication control unit 31A and the measurement unit 35A is different from the RFID communication control unit 31 and the measurement unit 35 according to the first embodiment, and the other configuration of the reader module 30A is the reader module 30 according to the first embodiment. Is the same. Therefore, only different parts will be described.
　ＲＦＩＤ２１Ａは、制御部２１１、共振動作制御部２１２、記憶部２１３を備える。制御部２１１と共振動作制御部２１２の基本構成は、第１の実施形態に係るＲＦＩＤ２１と同じである。 The RFID 21A includes a control unit 211, a resonance operation control unit 212, and a storage unit 213. The basic configurations of the control unit 211 and the resonance operation control unit 212 are the same as those of the RFID 21 according to the first embodiment.
　記憶部２１３には、リーダモジュールの動作プログラムが記憶されている。リーダモジュールの動作プログラムとは、例えば、当該ＲＦＩＤ２１Ａに特有の通信処理を行うためのプログラムである。また、当該プログラムには、当該共振タグ２０Ａの共振子の共振周波数、および、当該共振周波数の温度特性を表す関係テーブルも含まれている。 The storage unit 213 stores a reader module operation program. The reader module operation program is, for example, a program for performing communication processing unique to the RFID 21A. The program also includes a relationship table that represents the resonance frequency of the resonator of the resonance tag 20A and the temperature characteristics of the resonance frequency.
　ＲＦＩＤ２１Ａは、リーダモジュール３０ＡのＲＦＩＤ通信制御部３１Ａから、プログラム読み出しコマンドＳｃｒを受信すると、記憶部２１３から動作プログラムを読み出し、無線信号化する。ＲＦＩＤ２１Ａは、無線信号化された動作プログラムＳｐｒｏを、ＲＦＩＤ通信部３１Ａに出力する。なお、読み出しコマンドＳｃｒおよび無線信号化された動作プログラムＳｐｒｏの通信プロトコルは、ＲＦＩＤの種類に依存しない汎用のプロトコルとしておけば、読み出しコマンドＳｃｒおよび無線信号化された動作プログラムＳｐｒｏの通信を、確実に実行することができる。 When receiving the program read command Scr from the RFID communication control unit 31A of the reader module 30A, the RFID 21A reads the operation program from the storage unit 213 and converts it into a radio signal. The RFID 21A outputs the operation program Spro converted into a radio signal to the RFID communication unit 31A. In addition, if the communication protocol of the read command Scr and the operation program Spro converted into a radio signal is a general-purpose protocol that does not depend on the type of RFID, the communication of the read command Scr and the operation program Spro converted into a radio signal can be reliably performed. Can be executed.
　ＲＦＩＤ通信制御部３１Ａは、読み出しコマンドＳｃｒを送信して、無線信号化された動作プログラムＳｐｒｏを受信し、動作プログラムを復調する。ＲＦＩＤ通信制御部３１Ａは、復調した動作プログラムから、ＲＦＩＤ通信制御部３１Ａ自身の動作を設定するともに、計測部３５Ａの動作を設定する。ＲＦＩＤ通信制御部３１Ａ自身の動作設定とは、例えば、これ以降のＲＦＩＤ２１Ａに対する通信プロトコルの設定である。計測部３５Ａの動作設定とは、共振タグ２０Ａに装着されている共振子２３に対応した周波数ｆｐから温度Ｔを算出する関係テーブルの設定である。 The RFID communication control unit 31A transmits a read command Scr, receives the operation program Spro converted into a radio signal, and demodulates the operation program. The RFID communication control unit 31A sets the operation of the RFID communication control unit 31A itself and the operation of the measurement unit 35A from the demodulated operation program. The operation setting of the RFID communication control unit 31A itself is, for example, a communication protocol setting for the RFID 21A thereafter. The operation setting of the measurement unit 35A is a setting of a relation table for calculating the temperature T from the frequency fp corresponding to the resonator 23 attached to the resonance tag 20A.
　計測部３５Ａは、動作プログラムによる設定に基づいて温度Ｔを計測する。具体的には、計測部３５Ａは、動作プログラムで設定された関係テーブルと計測用信号送受信部３３で解析した周波数ｆｐから温度Ｔを算出する。 Measure unit 35A measures temperature T based on the setting by the operation program. Specifically, the measurement unit 35A calculates the temperature T from the relationship table set by the operation program and the frequency fp analyzed by the measurement signal transmission / reception unit 33.
　図６は、本発明の第２の実施形態に係る無線式センサシステムのフローチャートである。本実施形態の無線式センサシステム１０Ａのフローは、有効化コマンドＳｃｅの送信処理以降は、第１の実施形態に係る無線式センサシステムのフローチャートと同じである。また、第１の実施形態に係る無線式センサシステムのフローチャートと同じ処理の箇所には、同じステップ番号が記してあり、当該同じ処理の箇所は説明を省略する。 FIG. 6 is a flowchart of the wireless sensor system according to the second embodiment of the present invention. The flow of the wireless sensor system 10A of the present embodiment is the same as the flowchart of the wireless sensor system according to the first embodiment after the process of transmitting the validation command Sce. In addition, the same step numbers are given to the same processing portions as those in the flowchart of the wireless sensor system according to the first embodiment, and the description of the same processing portions is omitted.
　リーダモジュール３０Ａを起動する（Ｓ２０１）。リーダモジュール３０Ａを共振タグ２０Ａに近接させた状態で、読み出しコマンドＳｃｒを、共振タグ２０Ａに送信する（Ｓ２２１）。 The reader module 30A is activated (S201). In a state where the reader module 30A is brought close to the resonance tag 20A, a read command Scr is transmitted to the resonance tag 20A (S221).
　共振タグ２０Ａは、読み出しコマンドＳｃｒを受信すると（Ｓ１２１）、動作プログラムＳｐｒｏをリーダモジュール３０Ａに送信する（Ｓ１２２）。リーダモジュール３０Ａは、動作プログラムＳｐｒｏを受信すると（Ｓ２２２）、動作プログラムＳｐｒｏを復調して展開する（Ｓ２２３）。以下は、第１の実施形態と同様に、計測処理を行う。 When the resonance tag 20A receives the read command Scr (S121), the resonance tag 20A transmits the operation program Spro to the reader module 30A (S122). When receiving the operation program Spro (S222), the reader module 30A demodulates and develops the operation program Spro (S223). In the following, measurement processing is performed as in the first embodiment.
　このような構成および処理を用いることで、共振タグ毎に通信仕様等が異なっていても、リーダモジュールは、共振タグ毎に確実に通信を行うことができる。すなわち、リーダモジュールを汎用化することができる。また、動作プログラムＳｐｒｏ内に関係テーブルを含んでおくことで、いずれの共振タグを用いても、物理量を正確に計測することができる。 By using such a configuration and processing, the reader module can reliably communicate for each resonance tag even if the communication specifications and the like are different for each resonance tag. That is, the reader module can be generalized. In addition, by including the relation table in the operation program Spro, the physical quantity can be accurately measured regardless of which resonance tag is used.
１０，１０Ａ：無線式センサシステム
２０，２０Ａ：共振タグ
２１，２１Ａ：ＲＦＩＤ
２１１：制御部
２１２：共振動作制御部
２１３：記憶部
２２：ＲＦＩＤ通信用アンテナ
２３：共振子
２４：共振子用アンテナ
３０，３０Ａ：リーダモジュール
３１：ＲＦＩＤ通信制御部
３２：ＲＦＩＤ通信用アンテナ
３３：計測用信号送受信部
３４：計測用アンテナ
３５，３５Ａ：計測部
３６：表示部 10, 10A: Wireless sensor system 20, 20A: Resonance tags 21, 21A: RFID
211: Control unit 212: Resonance operation control unit 213: Storage unit 22: RFID communication antenna 23: Resonator 24: Resonator antenna 30, 30A: Reader module 31: RFID communication control unit 32: RFID communication antenna 33: Measurement signal transmission / reception unit 34: measurement antenna 35, 35A: measurement unit 36: display unit

Claims (4)

  1. 　周囲の物理量に応じて共振周波数が変化する共振子およびＲＦＩＤを備えた共振タグと、
    　前記共振子を励振する励振信号を送信し、該励振信号に基づく残響信号を受信する計測用信号送受信部、該計測用信号送受信部で得た前記残響信号に基づいて物理量の計測を行う計測部、および、前記ＲＦＩＤと通信を行うＲＦＩＤ通信制御部を備えたリーダモジュールと、
    　を備え、
    　前記ＲＦＩＤ通信制御部は、前記共振子を有効にする有効化コマンドを、前記ＲＦＩＤに送信し、
    　前記ＲＦＩＤは、前記有効化コマンドを取得すると、前記共振子の前記励振信号による共振を有効化する、無線式センサシステム。     A resonance tag including a resonator and an RFID whose resonance frequency changes according to a surrounding physical quantity; and
    A measurement signal transmission / reception unit that transmits an excitation signal for exciting the resonator and receives a reverberation signal based on the excitation signal, and a measurement unit that measures a physical quantity based on the reverberation signal obtained by the measurement signal transmission / reception unit A reader module including an RFID communication control unit that communicates with the RFID;
    With
    The RFID communication control unit transmits an enabling command for enabling the resonator to the RFID,
    When the RFID receives the activation command, the RFID activates resonance by the excitation signal of the resonator.
  2. 　前記ＲＦＩＤ通信制御部は、前記共振子が有効化されている時に、前記共振子を無効にする無効化コマンドを、前記ＲＦＩＤに送信し、
    　前記ＲＦＩＤは、前記無効化コマンドを取得すると、前記共振子の前記励振信号による共振を無効化する、請求項１に記載の無線式センサシステム。     The RFID communication control unit transmits an invalidation command for invalidating the resonator to the RFID when the resonator is activated,
    The wireless sensor system according to claim 1, wherein when the RFID receives the invalidation command, the RFID invalidates resonance due to the excitation signal of the resonator.
  3. 　前記ＲＦＩＤは、
    　前記共振子に並列接続されたスイッチ回路を備え、
    　前記スイッチ回路は、有効化されている時に開放状態であり、無効化されている時に導通状態である、
    　請求項１または請求項２に記載の無線式センサシステム。     The RFID is
    A switch circuit connected in parallel to the resonator;
    The switch circuit is in an open state when enabled, and in a conductive state when disabled.
    The wireless sensor system according to claim 1 or 2.
  4. 　前記ＲＦＩＤは、
    　前記リーダモジュールの動作プログラムを記憶する記憶部を備え、
    　前記ＲＦＩＤ通信制御部は、前記動作プログラムを取得して、当該ＲＦＩＤ通信制御部、前記計測用信号送受信部および前記計測部の動作を設定する、
    　請求項１乃至請求項３のいずれか１項に記載の無線式センサシステム。     The RFID is
    A storage unit for storing an operation program of the reader module;
    The RFID communication control unit acquires the operation program and sets the operation of the RFID communication control unit, the measurement signal transmission / reception unit, and the measurement unit.
    The wireless sensor system according to any one of claims 1 to 3.
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