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WO2011162148A1 - Capteur passif, système de capteur de type sans fil, et procédé de mesure utilisant le système de capteur de type sans fil - Google Patents

Capteur passif, système de capteur de type sans fil, et procédé de mesure utilisant le système de capteur de type sans fil Download PDF

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Publication number
WO2011162148A1
WO2011162148A1 PCT/JP2011/063764 JP2011063764W WO2011162148A1 WO 2011162148 A1 WO2011162148 A1 WO 2011162148A1 JP 2011063764 W JP2011063764 W JP 2011063764W WO 2011162148 A1 WO2011162148 A1 WO 2011162148A1
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identification information
frequency
signal
physical quantity
unit
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PCT/JP2011/063764
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English (en)
Japanese (ja)
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伊藤吉博
伊藤重夫
星野有里
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株式会社村田製作所
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Priority to JP2012521435A priority Critical patent/JP5387771B2/ja
Publication of WO2011162148A1 publication Critical patent/WO2011162148A1/fr

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    • 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
    • G01D21/00—Measuring or testing not otherwise provided for

Definitions

  • the present invention relates to a wireless sensor system that performs remote measurement by wirelessly communicating a master device that receives an operation input and a slave device that performs measurement, and a passive sensor used in the wireless sensor system.
  • the present invention also relates to a measurement method using such a wireless sensor system.
  • the resonance frequency of a sensor element such as a SAW resonator depends on the shape of the sensor element
  • the measurement accuracy depends on the formation accuracy of the sensor element.
  • an object of the present invention is to realize a wireless sensor system capable of obtaining high measurement accuracy even if there are individual differences due to manufacturing variations of sensor elements, and a passive sensor used in the wireless sensor system.
  • This invention relates to a passive sensor.
  • This passive sensor includes a sensor element, an antenna, and identification information recording means.
  • the sensor element outputs a resonance signal having a frequency corresponding to the physical quantity to be sensed by an external excitation signal.
  • the antenna is connected to the sensor element, and transmits and receives an excitation signal and a resonance signal.
  • the identification information recording means records identification information based on the frequency characteristic of the sensor element with respect to the physical quantity.
  • identification information that can identify the frequency characteristic is provided for each passive sensor. Thereby, if the said identification information is acquired and the calculation process according to a frequency characteristic is performed, the measurement error of the physical quantity by the individual difference of a sensor element can be suppressed.
  • the identification information recording means is composed of marks formed in a plane such as numerals, alphabets, symbols, colors, and barcodes.
  • This configuration shows a specific configuration example of the identification information recording means, and the identification information recording means is realized by various two-dimensional marks. Thereby, identification information can be easily acquired by the user visually recognizing and inputting an operation or performing an image reading process.
  • the identification information recording means is an RFID-IC connected to an antenna.
  • This configuration also shows a specific configuration example of the identification information recording means, and the identification information recording means is realized by RFID-IC. Thereby, identification information can be acquired by radio
  • the present invention also relates to a wireless sensor system including a passive sensor and a parent device that performs wireless communication with the passive sensor.
  • the base unit of the wireless sensor system includes a storage unit, a base unit side antenna, an identification information acquisition unit, and a measurement unit.
  • the storage unit of the master unit classifies the frequency characteristics of the sensor elements with respect to the physical quantity according to the difference in the frequency characteristics, and stores them in association with the identification information.
  • the base unit side antenna transmits and receives the excitation signal and the resonance signal by electromagnetic coupling or radio waves with the antenna of the passive sensor.
  • the identification information acquisition unit reads a mark that is an identification information recording unit, and acquires identification information.
  • the measurement unit calculates a physical quantity based on the resonance frequency of the resonance signal, the identification information acquired by the identification information acquisition unit, and the frequency characteristics for each identification information stored in the storage unit.
  • This configuration shows a wireless sensor system using a passive sensor provided with identification information recording means using the above-mentioned marks.
  • the base unit of the wireless sensor system includes a storage unit, a request signal generation unit, a base unit side antenna, an identification information acquisition unit, and a measurement unit.
  • the storage unit classifies the frequency characteristics of the sensor elements with respect to the physical quantity according to the difference in the frequency characteristics, and stores them in association with the identification information.
  • the request signal generation unit generates a request signal to the RFID-IC.
  • the base unit side antenna transmits and receives an excitation signal, a resonance signal, a request signal, and a response signal from the passive sensor to the request signal by electromagnetic coupling or radio wave with the antenna of the passive sensor.
  • the identification information acquisition unit analyzes the response signal and acquires identification information.
  • the measurement unit calculates a physical quantity based on the resonance frequency of the resonance signal, the identification information acquired by the identification information acquisition unit, and the frequency characteristics for each identification information stored in the storage unit.
  • This configuration shows a wireless sensor system using a passive sensor equipped with the above-described RFID-IC identification information recording means.
  • base station can obtain identification information with the resonance signal according to a physical quantity from a passive sensor.
  • the frequency characteristics corresponding to the individual difference of the sensor element (passive sensor) and the identification information are stored in association with each other in advance in the parent device, the associated information and the frequency of the acquired resonance signal are stored.
  • the identification information By using the identification information, the physical quantity can be measured while suppressing the influence of individual differences of the sensor elements.
  • the resonance signal, the request signal, and the response signal are communicated using different channels in the same communication band.
  • the present invention also relates to a wireless sensor system including a passive sensor and a parent device.
  • the passive sensor includes a sensor element that outputs a resonance signal having a frequency corresponding to a physical quantity to be sensed by an excitation signal from the outside, and an antenna that is connected to the sensor element and that transmits and receives the excitation signal and the resonance signal.
  • the parent device includes a parent device that wirelessly communicates with a passive sensor and detects a physical quantity based on a resonance signal.
  • this wireless sensor system includes a packaging material that packages a plurality of passive sensors grouped based on frequency characteristics with respect to a physical quantity to be sensed for each group. This packing material is provided with identification information recording means for identifying a group.
  • the master unit includes an identification information acquisition unit that acquires identification information from the identification information recording unit, a resonance frequency of the resonance signal, identification information acquired by the identification information acquisition unit, and frequency characteristics for each identification information stored in advance. And a measurement unit that calculates a physical quantity based on the above.
  • the identification information recording means is provided for each packing material including a plurality of passive sensors. Thereby, it is not necessary to provide identification information recording means for each passive sensor.
  • the present invention includes a sensor element that resonates at a frequency corresponding to a physical quantity to be sensed, receives a excitation signal from the master unit and transmits a resonance signal, and transmits an excitation signal and receives a resonance signal.
  • the present invention relates to a measurement method using a wireless sensor system including a master unit that calculates a physical quantity based on the frequency of the resonance signal.
  • This measurement method has at least the following three steps.
  • this measurement method includes a step of classifying passive sensors according to differences in frequency characteristics of sensor elements with respect to physical quantities, and recording them in association with identification information.
  • This measurement method includes a step of detecting a physical quantity with a sensor element and outputting a resonance signal.
  • This measurement method includes a step of calculating a physical quantity based on a resonance signal, identification information, and frequency characteristics for each identification information.
  • the present invention it is possible to realize a wireless sensor system that can suppress measurement errors due to individual differences in sensor elements and obtain high measurement accuracy, and a passive sensor used in the wireless sensor system.
  • 1 is a block diagram illustrating a configuration of a wireless sensor system 1 according to a first embodiment. It is a figure for demonstrating the concept of a group classification
  • FIG. 1 is a block diagram showing a configuration of a wireless sensor system 1 according to the present embodiment.
  • the wireless sensor system 1 includes a passive sensor 10 and a parent device 20. Passive sensor 10 and base unit 20 perform communication by electromagnetic field coupling or radio wave transmission / reception.
  • the communication mode is not limited to electromagnetic field coupling, but may be based on electromagnetic induction or radio wave radiation.
  • the passive sensor 10 includes an antenna 11, a SAW resonator 12 corresponding to the “sensor element” of the present application, and an identification mark 13.
  • a SAW resonator is used as the sensor element.
  • the resonance frequency varies depending on the physical quantity (temperature, magnetic strength, etc.) to be detected, such as a piezoelectric resonator, a crystal resonator, or a tuning fork resonator. Others may be used as long as they change.
  • the antenna 11 is realized by a coil electrode formed in a wound shape if it is an electromagnetic coupling method, and is realized by a dipole antenna if it is a radio wave transmission / reception method. In any method, the antenna 11 is formed in a shape (electrode length or the like) corresponding to a frequency band used for communication.
  • the antenna 11 receives the excitation signal SpL from the base unit side antenna 24 of the base unit 20 and applies it to the SAW resonator 12.
  • the antenna 11 radiates the resonance signal Sfp output from the SAW resonator 12 to the outside.
  • the resonance signal Sfp is transmitted from the antenna 11 of the passive sensor 10 to the parent device side antenna 24 of the parent device 20 by receiving the radiated resonance signal Sfp by the parent device side antenna 24.
  • the SAW resonator 12 includes, as a schematic configuration, a piezoelectric substrate and an IDT electrode formed on the surface of the piezoelectric substrate.
  • the resonance frequency is determined by the material of the piezoelectric substrate and the shape of the IDT electrode. For this reason, the SAW resonator 12 has individual differences in resonance frequency and frequency characteristics based on the formation accuracy in the manufacturing process. Such individual differences are completely unavoidable in the manufacturing process and affect measurement accuracy. However, in the present application, although specific contents will be described later, it is possible to suppress deterioration in measurement accuracy due to the individual difference.
  • the SAW resonator 12 has a characteristic of sensing a predetermined physical quantity (in this embodiment, the magnetic intensity is taken as an example) and being excited at a resonance frequency corresponding to the sensed magnetic intensity. Therefore, when the pulsed excitation signal SpL is received from the antenna 11, the SAW resonator 12 is excited at a resonance frequency corresponding to the sensed magnetic intensity and outputs the resonance signal Sfp. The resonance signal Sfp is output to the antenna 11.
  • the identification mark 13 is a mark printed on a base material (for example, a base substrate) of the passive sensor 10 on which the antenna 11 and the SAW resonator 12 are disposed. Specifically, numerals, alphabets, other symbols, colors, barcodes, and the like are used for the marks, and conceptually, any information that can be visually identified may be used. This mark is set in advance based on the individual difference of the frequency characteristic for each SAW resonator described above, and the mark means the identification group information Gr for each identification group.
  • the base unit 20 includes a control unit 21, a transmission signal generation unit 22, a transmission / reception unit 23, a base unit side antenna 24, a measurement unit 25, an identification information reading unit 26 corresponding to the “identification information acquisition unit” of the present application, and a display unit 27. Is provided.
  • the control unit 21 performs overall control of the base unit 20, and performs transmission / reception control such as switching between the transmission mode and the reception mode, and acquisition control of identification information. These controls are executed based on the operation input content from the operation unit 28, for example.
  • the transmission signal generation unit 22 generates a pulsed excitation signal SpL according to transmission mode start control from the control unit 21 and outputs it to the transmission / reception unit 23.
  • the transmission / reception unit 23 outputs the excitation signal SpL from the transmission signal generation unit 22 to the parent device side antenna 24, and outputs the resonance signal Sfp from the parent device side antenna 24 to the measurement unit 25.
  • the parent device side antenna 24 is realized by an antenna using a flat coil electrode or a dipole antenna according to specifications.
  • the measurement unit 25 includes a frequency conversion unit 251, a physical quantity detection unit 252, and a storage unit 252.
  • the frequency conversion unit 251 analyzes the frequency of the resonance signal Sfp and detects the resonance frequency fp.
  • the storage unit 253 stores identification group information Gr and frequency characteristics (magnetic intensity-frequency characteristics) with respect to the magnetic intensity associated with each identification group information Gr.
  • the identification group information Gr is input from the identification information reading unit 26 to the physical quantity detection unit 252. Based on the identification group information Gr, the physical quantity detection unit 252 reads the magnetic intensity-frequency characteristics corresponding to the corresponding identification group information Gr from the storage unit 253. The physical quantity detection unit 252 compares the read magnetic intensity-frequency characteristic with the resonance frequency from the frequency conversion unit 251, and reads the magnetic intensity corresponding to the resonance frequency to calculate the magnetic intensity.
  • the identification information reading unit 26 is composed of an image reader or the like, reads the identification mark 13 of the passive sensor 10 and acquires identification group information Gr. Note that if the identification mark 13 can be easily recognized by a person such as a numeral or alphabet, the operation unit 28 can be used as an identification information reading unit. In this case, the identification group information Gr is acquired by an operation input from the user. Thus, the acquired identification group information Gr is given to the physical quantity detection unit 252 of the measurement unit 25 as described above.
  • the display unit 27 is composed of a liquid crystal display or the like and displays the magnetic intensity calculated by the measurement unit 25.
  • FIG. 2 is a diagram for explaining the concept of group classification.
  • FIG. 3 is a flowchart showing pre-measurement processing including group classification.
  • an identification frequency width ⁇ f is calculated from a required magnetic strength measurement error ⁇ ER and a theoretical magnetic strength-frequency characteristic as a reference characteristic (FIG. 3: S901). Thereby, the identification frequency width ⁇ f according to the specification of the measurement error ⁇ ER can be set.
  • the identification group information Gr is set for each band of the identification frequency width ⁇ f with reference to the resonance frequency (reference frequency) Fo when no magnetic field is applied in the reference characteristics. Then, an upper limit frequency and a lower limit frequency, that is, a threshold frequency Thf is calculated for each identification group information Gr (FIG. 3: S902).
  • the identification group information Gr4 is set between a frequency that is higher by ⁇ f / 2 to the high frequency side and a frequency that is lower by ⁇ f / 2 to the low frequency side, centered on the reference frequency Fo. To do.
  • the frequency section from (Fo ⁇ f / 2) to (Fo + ⁇ f / 2) is registered in the identification group information Gr4.
  • the identification group information Gr4 is associated with a magnetic field strength-frequency characteristic that becomes the reference frequency Fo when no magnetic field is applied.
  • the identification group information Gr3 is set between a frequency that is higher by ⁇ f / 2 toward the high frequency side and a frequency that is lower by ⁇ f / 2 toward the low frequency side, centered on the reference frequency Fo + ⁇ f. To do.
  • the frequency section from (Fo ⁇ f / 2) + ⁇ f to (Fo + ⁇ f / 2) + ⁇ f is registered in the identification group information Gr3.
  • the identification group information Gr3 is associated with a magnetic field strength-frequency characteristic that becomes the reference frequency Fo + ⁇ f when no magnetic field is applied. Then, by performing such a shift process to the high frequency side, as shown in FIG. 2, the related information of the identification group information Gr2, Gr1 is set.
  • the identification group information Gr5 is defined between a frequency that is higher by ⁇ f / 2 toward the high frequency side and a frequency that is lower by ⁇ f / 2 toward the low frequency side, centered on the reference frequency Fo ⁇ f. Set to.
  • the frequency section from (Fo ⁇ f / 2) ⁇ f to (Fo + ⁇ f / 2) ⁇ f is registered in the identification group information Gr5.
  • the identification group information Gr5 is associated with a magnetic field strength-frequency characteristic that becomes the reference frequency Fo- ⁇ f when no magnetic field is applied. Then, by performing such a shift process to the low frequency side, as shown in FIG. 2, the related information of the identification group information Gr6 is set.
  • the number of identification group information Gr to be set is not limited to this, and may be set as appropriate from the highest frequency and the lowest frequency when no magnetic field is applied, which is caused by variations in the actual manufacturing process of the SAW resonator.
  • Each identification group information set in this way and the magnetic intensity-frequency characteristics respectively associated with the identification group information are stored in the storage unit 253 of the measurement unit 25 of the parent device 20 (FIG. 3: S910). ).
  • a pulsed excitation signal SpL is applied to each SAW resonator 12 without applying a magnetic field, and the resonance frequency fp is experimentally measured.
  • the identification group information Gr is determined by detecting which identification group information Gr1-6 belongs to the experimentally measured resonance frequency fp. For example, if the experimentally measured resonance frequency fp is between (Fo ⁇ f / 2) and (Fo + ⁇ f / 2), the SAW resonator 12 is set in the identification group information Gr4 (FIG. 3: S903). ).
  • the classified identification group information Gr is printed in the form of the identification mark 13 on the passive sensor 11 in which the SAW resonator 12 is disposed (FIG. 3: S904).
  • FIG. 4 is a flowchart illustrating a measurement process according to the embodiment.
  • FIG. 5 is a diagram for explaining the concept of measurement processing using group classification.
  • the identification group information is acquired before acquiring the resonance signal, but the identification group information may be acquired after acquiring the resonance signal.
  • base unit 20 starts the identification information acquisition mode (FIG. 4: S101). Thereby, the identification information reading part 26 of the main
  • base unit 20 starts the transmission mode of the measurement mode (FIG. 4: S104).
  • Base unit 20 transmits a pulsed excitation signal SpL (FIG. 4: S105). After transmitting excitation signal SpL, base unit 20 switches to reception mode (FIG. 4: S106).
  • the passive sensor 10 receives the excitation signal SpL (FIG. 4: S201).
  • the SAW resonator 12 of the passive sensor 10 is excited by the excitation signal SpL, resonates at a resonance frequency corresponding to the magnetic strength of the atmosphere, and outputs a resonance signal Sfp (FIG. 4: S202).
  • the passive sensor 10 transmits a resonance signal Sfp (FIG. 4: S203).
  • the master unit 20 receives the resonance signal Sfp (FIG. 4: S107), analyzes the frequency of the resonance signal Sfp, and detects the resonance frequency fp (FIG. 4: S108).
  • Base unit 20 calculates the magnetic intensity based on the detected resonance frequency fp, the acquired identification group information Gr, and the magnetic intensity-frequency characteristics corresponding to the previously stored identification group information (FIG. 4: S109).
  • the magnetic intensity is calculated using the concept as shown in FIG.
  • the identification group information of the SAW resonator 12 is Gr4
  • the magnetic intensity-frequency characteristic SP (G4) of the frequency (reference frequency) Fo when no magnetic field is applied is read.
  • the magnetic strength P4 is calculated by referring to the detected resonance frequency fp in the characteristic.
  • the magnetic strength-frequency characteristic SP (G1) of the frequency (Fo + 3 ⁇ f) when no magnetic field is applied is read.
  • the magnetic intensity P1 is calculated by referring to the detected resonance frequency fp in the characteristic.
  • the magnetic strength-frequency characteristic SP (G5) of the frequency (Fo- ⁇ f) when no magnetic field is applied is read.
  • the magnetic intensity P5 is calculated by referring to the detected resonance frequency fp in the characteristic.
  • the measured value of the magnetic strength is within the range of the measurement error width ⁇ ER of the identification group to which it belongs even if it is large, and the measurement error is a measurement error width ⁇ ER corresponding to a preset specification.
  • the magnetic intensity physical quantity
  • the magnetic intensity can be reliably detected within a measurement error narrower than the measurement error that can be taken due to manufacturing variations of the SAW resonator 12.
  • a 10.6 MHz crystal resonator as a reference frequency at a standard temperature is used as a sensor element. The case will be described.
  • Such a crystal resonator has a temperature characteristic of the resonance frequency, and the resonance frequency and temperature have a linear relationship.
  • the inclination that is, the ratio of frequency change to temperature change is 947 Hz / ° C.
  • a frequency range of about ⁇ 1.06 MHz is set with 10.6 MHz as the center frequency (the above-described reference frequency Fo) based on the assumed variation in the above-described manufacturing process.
  • the temperature-frequency characteristic corresponding to the identification group information is read, and the detected resonance frequency fp is applied to calculate the temperature.
  • FIG. 6 is a block diagram showing the configuration of the wireless sensor system 1A according to the present embodiment.
  • FIG. 7 is a diagram showing a concept of setting a frequency band according to the present embodiment.
  • the wireless sensor system 1A of the present embodiment is obtained by replacing the wireless sensor system 1 shown in the first embodiment with the identification mark 13 of the passive sensor 1 replaced with the RFID-IC 14 of the passive sensor 1A. is there. Along with this, the means for acquiring the identification information of the master unit 20A has been changed. Therefore, in the following, only differences from the first embodiment will be described in detail.
  • the passive sensor 1A includes an RFID-IC14.
  • the RFID-IC 14 is connected to the antenna 11 similarly to the SAW resonator 12.
  • the RFID-IC 14 stores the identification group information Gr described above.
  • the RFID-IC 14 is activated by the request signal Srq from the parent device 20A, and generates a response signal San including the identification group information Gr.
  • Response signal San is radiated from antenna 11 and transmitted to base unit 20A.
  • the master unit 20A includes a request signal generation unit 31 and an identification information analysis unit 32 instead of the identification information reading unit 26.
  • the request signal generation unit 31 When receiving the identification information acquisition control from the control unit 21A, the request signal generation unit 31 generates a request signal Srq having a predetermined frequency and outputs the request signal Srq to the transmission / reception unit 23A.
  • the transmission / reception unit 23A is provided with a switch (SW) 231 and transmits a request signal Srq to the parent-side antenna 24 when acquiring identification information.
  • the frequency frq of the request signal Srq and the frequency fan of the response signal San are set in the same frequency band as the resonance frequency of the SAW resonator 12, thereby obtaining identification information.
  • Communication and communication for measurement can be realized by only a pair of parent device side antenna 24 and antenna 11.
  • the passive sensor 10A and the parent device 20A can be downsized.
  • the transmission / reception unit 23A receives the response signal San and outputs it to the identification information analysis unit 32 when the identification information is acquired.
  • the transmission / reception unit 23A In the transmission mode, the transmission / reception unit 23A outputs the excitation signal SpL from the transmission signal generation unit 22 to the parent device side antenna 24 as described above, and the resonance signal Sfp from the parent device side antenna 24 to the measurement unit 25. Output.
  • the identification information analysis unit 32 analyzes the response signal San and acquires identification group information Gr.
  • the identification information analysis unit 32 outputs the identification group information to the physical quantity detection unit 252 of the measurement unit 25.
  • the measurement unit 25 calculates the magnetic strength using the identification group information Gr, the resonance frequency fp of the resonance signal Sfp, and the magnetic strength-frequency characteristic for each identification group, as in the first embodiment.
  • FIG. 8 is a flowchart showing measurement processing according to the present embodiment.
  • base unit 20A starts a measurement mode (S301) and transmits a pulsed excitation signal SpL (S302). After transmitting excitation signal SpL, base unit 20A switches to reception mode (S303).
  • the passive sensor 10A receives the excitation signal SpL (S201).
  • the SAW resonator 12 of the passive sensor 10A is excited by the excitation signal SpL, oscillates at a resonance frequency corresponding to the magnetic intensity of the atmosphere, and outputs a resonance signal Sfp (S202).
  • the passive sensor 10A transmits a resonance signal Sfp (S203).
  • Main unit 20A receives resonance signal Sfp (S304), performs frequency analysis of resonance signal Sfp, and detects resonance frequency fp (S305).
  • Master unit 20A detects which channel in the used frequency band the resonance frequency fp corresponds to. Furthermore, base unit 20A senses the availability of other channels in the used frequency band (S306).
  • the master unit 20A generates a request signal Srq with the detected frequency of the empty channel and transmits it from the master unit side antenna 24 (S307).
  • the passive sensor 10A receives the request signal Srq (S204).
  • the RFID-IC 14 of the passive sensor 10A is activated by the request signal Srq and generates a response signal San including its own identification group information Gr.
  • the passive sensor 10A transmits a response signal San from the antenna 11 (S205).
  • the master unit 20A receives the response signal San (S308).
  • Main unit 20A analyzes response signal San and acquires identification group information Gr (S309).
  • Main unit 20A calculates the magnetic intensity based on the detected resonance frequency fp, the acquired identification group information Gr, and the magnetic intensity-frequency characteristics corresponding to the previously stored identification group information (S310).
  • the magnetic intensity can be measured with a small measurement error. Furthermore, if the configuration of the present embodiment is used, the external access means for acquiring the identification group information in the master unit and the external access means for measurement are only antennas, and the size can be reduced.
  • the passive sensor 10 is packed for each identification group, packed in the same box, and packed when shipped.
  • An identification mark may be printed on the box.
  • base unit 20 may read the identification mark provided on the packing box.
  • 1,1A-wireless sensor system 10,10A-passive sensor, 11-antenna, 12-SAW resonator, 13-identification mark, 14-RFID-IC, 20, 20A-base unit, 21, 21A-control unit, 22-transmission signal generation unit, 23, 23A-transmission / reception unit, 24-base unit side antenna, 25-measurement unit, 251-frequency conversion unit, 252-physical quantity detection Section, 253-storage section, 26-identification information reading section, 27-display section, 31-request signal generation section, 32-identification information analysis section

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Abstract

La présente invention concerne la réalisation d'un système de capteur de type sans fil, qui fait preuve d'une précision de mesure élevée même s'il existe des différences individuelles dues aux variations de fabrication entre les éléments de capteur ou autres éléments semblables. Un capteur passif (10) comprend un résonateur à onde acoustique de surface OAS (12) et un marqueur d'identification (13). Le marqueur d'identification (13) est un marqueur correspondant aux informations de groupe d'identification (Gr). Un dispositif maître (20) émet un signal d'excitation (SpL) vers le capteur passif (10), et reçoit un signal de résonance (Sfp) du résonateur OAS (12) afin d'acquérir une fréquence de résonance (fp). En outre, le dispositif maître (20) lit le marqueur d'identification (13) afin d'acquérir les informations de groupe d'identification (Gr). Le dispositif maître (20) calcule ensuite une intensité magnétique en se basant sur le signal de résonance (Sfp), les informations de groupe d'identification (Gr), et une caractéristique entre intensité magnétique et fréquence pour chaque information de la pluralité d'informations de groupe d'identification (Gr) stockées à l'avance.
PCT/JP2011/063764 2010-06-24 2011-06-16 Capteur passif, système de capteur de type sans fil, et procédé de mesure utilisant le système de capteur de type sans fil WO2011162148A1 (fr)

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Cited By (2)

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WO2014181667A1 (fr) * 2013-05-09 2014-11-13 株式会社村田製作所 Système de capteur sans fil et module lecteur
JP2021505910A (ja) * 2017-11-30 2021-02-18 ムニョス、マイケル 取り付けられた及び／又は埋め込まれた受動電磁センサを使用して、配電ネットワーク、液体及びガスパイプライン、並びに核剤、化学剤及び生物剤を含む大気汚染物質の監視のプロセス制御及び予知保全を可能にする、モノのインターネット（ＩｏＴ）対応の無線センサシステム

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WO2014181667A1 (fr) * 2013-05-09 2014-11-13 株式会社村田製作所 Système de capteur sans fil et module lecteur
JPWO2014181667A1 (ja) * 2013-05-09 2017-02-23 株式会社村田製作所 無線式センサシステムおよびリーダモジュール
JP2021505910A (ja) * 2017-11-30 2021-02-18 ムニョス、マイケル 取り付けられた及び／又は埋め込まれた受動電磁センサを使用して、配電ネットワーク、液体及びガスパイプライン、並びに核剤、化学剤及び生物剤を含む大気汚染物質の監視のプロセス制御及び予知保全を可能にする、モノのインターネット（ＩｏＴ）対応の無線センサシステム
JP7316292B2 (ja) 2017-11-30 2023-07-27 ムニョス、マイケル 取り付けられた及び／又は埋め込まれた受動電磁センサを使用して、配電ネットワーク、液体及びガスパイプライン、並びに核剤、化学剤及び生物剤を含む大気汚染物質の監視のプロセス制御及び予知保全を可能にする、モノのインターネット（ＩｏＴ）対応の無線センサシステム

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