WO2008072712A1 - Système de senseur radio, et système de gestion de la santé d'un corps vivant - Google Patents

Système de senseur radio, et système de gestion de la santé d'un corps vivant Download PDF

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Publication number
WO2008072712A1
WO2008072712A1 PCT/JP2007/074062 JP2007074062W WO2008072712A1 WO 2008072712 A1 WO2008072712 A1 WO 2008072712A1 JP 2007074062 W JP2007074062 W JP 2007074062W WO 2008072712 A1 WO2008072712 A1 WO 2008072712A1
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WIPO (PCT)
Prior art keywords
sensor
radio wave
transmitted
sensors
controller
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PCT/JP2007/074062
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English (en)
Japanese (ja)
Inventor
Masaaki Ichiki
Toshihiro Itoh
Tsuyoshi Ikehara
Takeshi Kobayashi
Ryutaro Maeda
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National Institute Of Advanced Industrial Science And Technology
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Application filed by National Institute Of Advanced Industrial Science And Technology filed Critical National Institute Of Advanced Industrial Science And Technology
Publication of WO2008072712A1 publication Critical patent/WO2008072712A1/fr

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0002—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
    • A61B5/0004—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network characterised by the type of physiological signal transmitted
    • A61B5/0008—Temperature signals

Definitions

  • Wireless sensor system living body health management system
  • the present invention relates to a wireless sensor system and a biological health management system.
  • one of the problems is securing the power supply of the sensor in a state of being attached to a measurement target.
  • the measured value at the sensor is analog data, and it is necessary to convert it to digital data in order to transmit it wirelessly. Power is also consumed by the A / D converter for this purpose.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2006-98398
  • an ad hoc method is employed in which direct communication is performed between slave units without using a master unit.
  • ad hoc communication since each terminal communicates asynchronously, communication is not established unless each terminal is always in a receiving state, and it is difficult to reduce power consumption.
  • the present invention has been made based on such a technical problem, and an object thereof is to provide a wireless sensor system and the like that can save power.
  • the wireless sensor system of the present invention measures a physical quantity, and wirelessly transmits a message including the measured measurement data
  • a wireless sensor system comprising a controller for receiving a telegram, wherein the controller transmits a radio wave for supplying power to the sensor to a radio wave generation source and transmits the radio wave generation source to a plurality of sensors. By stopping the radio wave, the command to the sensor is included in the radio wave.
  • the sensor side responds to the timing, length, etc., when the radio wave is stopped.
  • the received command can be recognized on the sensor side.
  • a configuration for receiving radio waves for power supply and a configuration for transmitting a telegram including measurement data may be provided.
  • commands from the controller can be received with a configuration such as an antenna for receiving radio waves for power supply. Therefore, it is possible to reduce power consumption without requiring standby power to receive commands.
  • any command may be included in the radio wave for supplying power.
  • the sensor side By sending a message from the sensor to the controller in the time zone individually assigned to each sensor in advance, the sensor side does not need to send a message to the sensor from the controller side. Standby power for receiving is also unnecessary.
  • the controller side requests the sensor to transmit a message, the command for that purpose may be included in the radio wave for supplying power to the sensor.
  • the controller verifies the message transmitted from each of the plurality of sensors, and when there is an error in the verified message, the command that requests the sensor that transmitted the message to retransmit the message. Can also be included in the radio waves.
  • Such a wireless sensor system may be used for any purpose, it is suitable for use in a system for managing the health of a living organism such as an animal.
  • the present inventors attach a sensor for measuring physical quantities such as acceleration, inclination, temperature, blood flow, blood pressure, pulse, etc. to a living body to be managed in order to manage the health of the living body, and transmit the measurement transmitted from the sensor.
  • a sensor for measuring physical quantities such as acceleration, inclination, temperature, blood flow, blood pressure, pulse, etc.
  • the configuration is as follows.
  • it is a system for managing the health of a living body, and is equipped with a plurality of sensors that are mounted on a plurality of living bodies that perform management to measure a predetermined physical quantity and wirelessly transmit a message including the measured measurement data. And a controller that receives a message from the sensor, a radio wave generation source that transmits a radio wave for supplying power to the sensor, and an abnormal health condition of the living body based on the measurement data included in the message received by the controller. And a controller that determines whether or not a radio wave has occurred, wherein the controller includes a command for the sensor in the radio wave by stopping the radio wave transmitted from the radio wave generation source to the plurality of sensors. This is the configuration.
  • the senor used may have any configuration, but in order to reduce power consumption by reducing the amount of measurement data and the frequency of data transmission, for example, an acceleration sensor and a temperature sensor having the following configuration may be used. Is preferred.
  • a deformable member that deforms according to acceleration, a piezoelectric material portion that is formed on the surface of the deformable member and generates an electric charge according to the deformation of the deformable member, and an electric charge generated at the piezoelectric material portion
  • a signal processing circuit for generating a signal when the applied voltage exceeds a predetermined set voltage.
  • a plurality of piezoelectric material portions are electrically connected in series with each other. Further, a plurality of signal processing circuits are provided, and are connected to at least two different piezoelectric material portions among the plurality of piezoelectric material portions connected in series.
  • a voltage generated according to the number of piezoelectric material portions connected in series between the piezoelectric material portion to which the signal processing circuit is connected and the reference potential is generated. It is to be applied.
  • the piezoelectric material portion there may be a piezoelectric thin film, a piezoelectric thick film, and a piezoelectric material that is subjected to a barta bonding.
  • each 1S piezoelectric material part When the voltage applied from the piezoelectric material part to the signal processing circuit exceeds the set voltage, the signal processing circuit emits a signal. By recognizing the signal processing circuit that issued this signal, the degree of the applied acceleration is obtained. be able to. In other words, acceleration can be measured digitally based on signals emitted from a plurality of signal processing circuits.
  • signals from a plurality of signal processing circuits can be output via electrical connection, output via wireless communication, or stored in a memory circuit or the like. It is possible.
  • the inventors pay attention to a temperature switch using a bimetal structure.
  • the temperature switch using the bimetal structure has zero power consumption and the output is also an ON / OFF electrical switch, so it can be read directly as a digital signal. Power can be minimized.
  • the bimetal temperature switch is a switch that operates at a specific temperature, it cannot be used to detect a continuous temperature change within a wide temperature range.
  • a bimetallic cantilever formed by laminating two kinds of materials having different linear expansion coefficients, an electric contact member facing the tip of the cantilever with a gap, and the cantilever or the electric contact member
  • a plurality of sets of voltage application units that apply voltage and detection circuits that detect voltage fluctuations when a cantilever deformed in response to a temperature change comes into contact with or leaves the electrical contact member.
  • the bimetallic cantilever is deformed according to the temperature change.
  • the timing differs. The longer the cantilever and the narrower the gap between the tip of the cantilever and the electrical contact member, the smaller the temperature change.
  • each pair Multiple sets of cantilevers and electrical contact members when there is a temperature change corresponding to the temperature pitch determined by the difference in cantilever length or the gap between the tip of the cantilever and the electrical contact member The contact state changes with the detection circuit so that the contact (or separation) can be detected by voltage fluctuation.
  • temperature detection in a wide temperature range can be performed digitally by using multiple sets of cantilevers. Therefore, based on the signals emitted from a plurality of detection circuits, the temperature can be adjusted to such a temperature sensor.
  • a measurement control circuit that performs digital measurement may be further provided.
  • the cantilever is formed of a conductive material on at least the layer facing the electric contact member.
  • the layer facing the electrical contact member of the force cantilever is made of a non-conductive material
  • the surface of the cantilever facing the electrical contact member is made of a conductive material, and the cantilever is deformed according to temperature changes. It is preferable to provide a conductive member such as a wiring that conducts to the electrical contact member.
  • the voltage application unit may be a capacitor fed from a power source.
  • the capacitor is discharged when a cantilever that does not need to be constantly applied with a voltage contacts the electrical contact member, and the voltage change can be detected by the detection circuit. Then, when the capacitor is discharged, the power supply control circuit may supply power from the power source to the capacitor.
  • a command is sent to the sensor using a radio wave for supplying power, the time of each sensor is corrected, and the timing at which data is transmitted from each sensor is synchronized. Requested data retransmission when there was an error in data transmission. As a result, data transmission from each sensor can be performed smoothly and reliably, and the power consumption can be suppressed because each sensor side does not need to spend standby power to receive these commands.
  • FIG. 1 is a conceptual diagram of a bird flu monitoring system in the present embodiment.
  • FIG. 2 is a diagram showing a configuration of a sensor.
  • FIG. 3 is a diagram showing a specific configuration of an acceleration sensor.
  • FIG. 4 is a diagram showing a specific example of voltage change in the acceleration sensor.
  • FIG. 5 is a diagram showing a specific configuration of a temperature sensor.
  • FIG. 6 This is an example of the configuration when the temperature sensor is manufactured by MEMS technology.
  • FIG. 7 is a diagram showing the relationship between the cantilever length and the operating temperature difference.
  • FIG. 8 is a diagram showing a transmission timing of a radio wave for supplying power to a sensor and a timing of transmitting a telegram including measurement data from the sensor.
  • FIG. 9 (a) is an example of data transmitted by the sensor in this embodiment, (b) is an example of data transmitted by a conventional sensor, and (c) is an example of switch assignment in the sensor of this embodiment.
  • Base end 222d ... Tip, 224 ... Electric contact member, 225 ... Signal processing circuit, 225a ... Capacitor (voltage application unit), 225b ... Detection circuit, 240 ... Communication control Part, 250 ... antenna
  • FIG. 1 shows a bird flu monitoring system (biological health management system) according to the present invention.
  • FIG. 1 shows a bird flu monitoring system (biological health management system) according to the present invention.
  • one or more avian influenza monitoring systems 100 are installed so as to cover the sensor 120 attached to the bird (living body) managed in the management area 110 and the management area 110.
  • the management area 110 is provided for raising birds, such as a birdhouse.
  • the management area 110 may be an outdoor area such as a ranch, an indoor area such as a barn, or each animal in the zoo. It can be a building or a whole natural park.
  • the configuration of the present invention can also be applied to human subjects.
  • the management area 110 In the management area 110, the sensor 120 and the relay station 130 communicate wirelessly. Therefore, the management area 110 is an area where the relay station 130 can acquire the signal from the sensor 120 directly or indirectly. Therefore, when the management area 110 is widened, the power to increase the wireless communication output of the sensor 120 and the number of relay stations 130 may be increased. It is preferable that one relay station 130 can cover an area having a radius of several tens of meters.
  • a communication method between the sensor 120 and the relay station 130 there are standards such as IEEE802.lx wireless LAN, PHS (registered trademark), Bluetooth (registered trademark), ZigBee (registered trademark), and UWB. However, considering the balance between power consumption and communication distance, ZigBee (registered trademark) is now the preferred method. Of course, other methods may be used.
  • the sensor 120 is a high-density integration of a sensor group that detects the posture and behavior of a bird, a vital sign, and the like, and a detection processing circuit, a communication circuit, a power supply, and a power management device, to monitor the health state of the bird. It is a system in package.
  • Measurement data in the sensor 120 is transmitted wirelessly.
  • the transmitted measurement data is received by the relay station 130 and further transferred to the relay station controller 140.
  • the relay station 130 and the relay station controller 140 can be connected by wireless or wired Ethernet (registered trademark).
  • the relay station controller 140 is installed in the management area 110. Not only the relay station 130 but also the relay stations in the other management areas 112 and 114 are controlled, and the data of the sensors 120 received by these relay stations are collected and transferred to the transmission / reception device 150.
  • the relay station controller 140 is assigned an identification mark such as an IP address to all the relay stations 130 installed in the management area 110, and is provided with a control device. It is possible to add a function that mediates transmission of commands given from 160 to each sensor 120.
  • the relay station controller 140 can also be configured to control hand over between the relay stations 130.
  • the transmission / reception device 150 transmits the measurement data of the sensor 120 to the control device 160 through the Ethernet (registered trademark), the Internet, a telephone line, a wireless telephone network.
  • the control device 160 is a computer device in terms of hardware, and can be manufactured by installing software having necessary functions in a general-purpose computer. Therefore, many functions of the control device 160 are realized by cooperation of hardware such as CPU, memory, network adapter, and modem, which is provided in a general computer, and software.
  • the control device 160 monitors the occurrence of bird flu by determining the measurement data transmitted from the sensor 120.
  • the determination result that is, information indicating that avian influenza has occurred is output as an alarm output, It can also be output by printing out printed matter, sending an e-mail to a destination input in advance.
  • the control device 160 may be installed in the vicinity of the management area 110! /, But it may be installed at a remote location! /, Or may be!
  • the bird flu monitoring system 100 it is possible to monitor the behavior of a large number of birds at low cost and online without interfering with the behavior of the bird by attaching a sensor 120 to the control animal and monitoring it wirelessly. It becomes possible. This makes it easy to understand the health status of birds to be managed, and to quickly detect emergencies such as the occurrence of infectious diseases.
  • the sensor 120 includes, for example, a physical quantity sensor 210 for measuring a predetermined physical quantity on a thin film substrate, and a circuit for controlling each part so as to perform a predetermined operation as the sensor 120.
  • the sensor control unit 220 configured with the above, the capacitor unit 230 that stores power necessary for the operation of the sensor 120, and the communication control unit 240 for performing communication control for transmitting and receiving radio waves to and from the relay station 130.
  • an antenna 250 mounted on a thin-band (film-like) substrate.
  • Such a sensor 120 uses the most advanced ultra-high-density mounting technology and MEMS processing technology, and is also made extremely compact by narrowing down the sensor function.
  • an ultra-small sensor chip is manufactured by a system-in-package with a three-dimensional multilayer chip (5 mm or less) in the middle lcm square area on a 3 cm square antenna FPC.
  • the physical quantity sensor 210 is a physical quantity sensing chip that measures at least one of acceleration, inclination, temperature, “blood flow, blood pressure” and pulse.
  • an acceleration sensor 210A and a temperature sensor 210T are provided as the physical quantity sensor 210.
  • the sensor information including acceleration information and temperature information detected by the acceleration sensor 210A and the temperature sensor 210T is not transmitted to the relay station 130 in succession.
  • the ability to reduce power consumption by reducing the amount of power can be reduced with S.
  • the sensor control unit 220 includes an IC and a memory, and is a physical quantity sensor.
  • An event-driven circuit that performs predetermined processing when a signal is received from 210 is provided.
  • the predetermined processing there is a method of accumulating the contents of the signal received from the physical quantity sensor 210 in the memory.
  • the sensor 120 receives electric waves transmitted from the relay station 130 based on the control of the relay station controller 140 by the antenna 250, thereby generating power by the induced electromotive force. This power is generated and stored in the capacitor unit 230. Therefore, the sensor control unit 220 includes an RF-DC conversion circuit that converts a radio wave received by the antenna 250 into a direct current, and a charging circuit that stores electric power in the capacitor unit 230 by the direct current converted by the RF-DC conversion circuit. It is equipped with.
  • the sensor 120 Because it is an active sensor that is installed and communicates with its own power, it does not require scanning by a reader like RF—ID, and it is never easy to control its behavior! / Suitable for bird management ing.
  • the communication control unit 240 responsible for communication control functions as an ultra-small wireless communication device for transmitting a message including measurement data from the physical quantity sensor 210, and has a communication control circuit. It has a control chip and an impedance matching circuit that matches the impedance of radio waves to be transmitted and received.
  • the control chip is configured to have a unique identifier, and when transmitting sensor information from the physical quantity sensor 210, the control chip is configured to transmit the identifier together.
  • FIG. 3 is a diagram showing a configuration of an acceleration sensor 210 A for detecting acceleration in the physical quantity sensor 210.
  • the acceleration sensor 210A includes a deformation member 211 that deforms according to the acceleration applied to the acceleration sensor 210A, and a piezoelectric material portion 212 that generates an electric charge according to the deformation of the deformation member 211.
  • a signal processing circuit 213 to which a voltage obtained according to the amount of electric charge generated in the piezoelectric material portion 212 is applied.
  • the deformable member 211 for example, a cantilever type composed of a cantilever 21 la and a weight 21 lb can be used.
  • a deformable member 211 is not limited to a cantilever type but may be another type such as a diaphragm type.
  • Other types include, for example, a structure in which a weight is supported by a plurality of cantilevers (see Journal of Micromechanics and Microengineering, vol. 10, (2000) 322-328).
  • the piezoelectric material part 212 is made of a piezoelectric thin film formed on the surface of the deformable member 211.
  • a material for forming such a piezoelectric thin film in addition to PZT (lead zirconate titanate) material, well-known piezoelectric materials such as Ba TiO, ZnO, A1N, quartz crystal, PVDF (polyvinylidene fluoride) are used.
  • the piezoelectric material portion 212 When the deformable member 211 is deformed according to the applied acceleration, the piezoelectric material portion 212 generates an electric charge according to the deformation amount. That is, as the applied acceleration increases, the piezoelectric material portion 212 generates a larger charge. Generated charge and piezoelectric The voltage obtained in the piezoelectric material part 212 is determined by the load capacity in the material part 212.
  • the piezoelectric material portion 212 may be formed by forming a thin film made of a predetermined piezoelectric material on the surface, and the cantilever 21 la itself. The cantilever 21 la itself is made of piezoelectric material.
  • the piezoelectric material portion 212 may employ a piezoelectric thick film, a material that joins a piezoelectric body with a barta joint, or the like.
  • the deformable member 211 having such a piezoelectric material portion 212 is used in the acceleration sensor 210A.
  • a plurality of piezoelectric material portions 212 are electrically connected in series to each other, and one end side thereof is electrically grounded.
  • the signal processing circuit 213 is a MoS (Metal Oxide Semiconductor) transistor having a circuit configuration as shown in FIG. This signal processing circuit 213 can be provided in an IC constituting the sensor control unit 220.
  • Such a signal processing circuit 213 includes a deformable member 21 connected in series as shown in FIG.
  • a plurality of 1 are connected to different deformation members 21 1.
  • the number of signal processing circuits 213 may be smaller than the number of deformation members 211 connected in series, or may be connected to all the deformation members 211.
  • 40 deformable members 21 1 are provided in series, and among them, the signal processing circuit 213 is connected to the four deformable members 21 1 at the positions previously extracted and selected! / RU
  • the gate of the signal processing circuit 213 is connected to the deformable member 2 to which the signal processing circuit 213 is connected.
  • the voltage from the eleven piezoelectric material portions 212 is applied.
  • the piezoelectric material portion of the deformable member 211 is applied.
  • the signal processing circuit 213 connected to the nth deformable member 211 from the ground side generates a potential difference from the reference potential in the n piezoelectric material portions 212 from the ground side.
  • the sum of the measured voltages V (n XV) is applied.
  • each signal processing circuit 213 the voltage at which the transistor is turned ON is preset. That is, when the applied voltage exceeds the set voltage, the signal processing circuit 213 is turned on.
  • the signal processing circuit 21 When the signal from 3 is switched from OFF to ON or from ON to OFF, the fact that the signal has been switched from OFF to ON or from ON to OFF is stored in the memory, and the stored information is stored at a predetermined timing. Is transmitted to the control device 160 via the relay station 130.
  • the individual deformable members 211 are similarly deformed, and therefore the same voltage is applied from each piezoelectric material portion 212. At this time, it is applied to the signal processing circuit 213 connected to the grounding side because the number of piezoelectric material portions 212 connected to the grounding side is small. The voltage is small. On the other hand, since the signal processing circuit 213 connected to the deformable member 211 far from the ground side has a large number of piezoelectric material parts 212 connected from the ground side, the applied voltage is growing.
  • each signal processing circuit 213 has a function like a switch.
  • the acceleration caused by the bird's movement is 0.5 g during sleep, 0.2 g ⁇ , 0.5 g during meal, and lg during tremor.
  • the piezoelectric material portion 212 provided on the deformable member 211 is, for example, 1. lmV / g
  • the piezoelectric material portions 212 of the individual deformable members 211 may be As shown in Table 1, the output voltage is 0.055 mV, 0.22 mV, 0.55 mV, and 1. lmV.
  • the eye deformation member 211 is provided with the signal processing circuit 213, the voltage applied in accordance with the bird's movement is as shown in Table 1.
  • the attached signal processing circuit 213 213 213 becomes 0N.
  • n 3 10 15 All signal processing circuits 213 213 213 213 attached to the 40th deformable member 211 are generated.
  • the acceleration sensor 210A it is possible to digitally obtain the acceleration level according to the number of signal processing circuits 213 that are turned ON. For example, as shown in Table 1, when signal processing circuit 213 is SON, level 1
  • Figure 4 shows that bird behavior is, for example, 15 minutes for pupae, 10 minutes for meals, 30 minutes for sleep, This shows the temporal displacement of the voltage applied to each signal processing circuit 213 in the order of 5 minutes.
  • the signal processing circuits 213, 213, 21 when the tremor is started which is an operation that can be determined that an abnormality has occurred in the state of the bird.
  • the sensor 120 transmits sensor information when the temperature detected by the temperature sensor 210T deviates from the preset range and is a value that can be determined that an abnormality has occurred in the state of the bird. ing. That is, when the acceleration level is level 4 in the sensor control unit 220, the sensor 120 transmits a signal indicating that the detected acceleration level is level 4.
  • control device 160 When the control device 160 receives a sensor 120 force, or a signal indicating that the acceleration level is level 4, it determines that an abnormality has occurred in the physical condition of the bird in the management area 110. .
  • the sensor control unit 220 may monitor the signal processing circuit 213 that is turned on only when there is a tremor.
  • the piezoelectric material part 212 made of a piezoelectric material directly generates an electric charge, so that the power consumption during standby is almost zero.
  • the piezoelectric material portion 212 provided in the deformable member 211 is provided in series, the amount of power generated when acceleration is applied can be increased. Therefore, the acceleration sensor 210A must be highly sensitive. I'll do it.
  • such an acceleration sensor 210A can be made small by MEMS technology, and by reducing power consumption, it is possible to eliminate the battery and reduce the weight.
  • the sensitivity in the piezoelectric material part 212, the number of the deformable members 211, the set voltage that is turned on in the signal processing circuit 213, and the like are merely examples, and can be appropriately changed.
  • Deformable member 211 including piezoelectric material portion 212 provided in series connection By changing the number, the connection position of the signal processing circuit 213, the set voltage in the signal processing circuit 213, etc., various accelerations can be measured in addition to birds.
  • the individual deformable member 211, the piezoelectric material part 212, and the signal processing circuit 213 themselves can be used in common, so that a device with high versatility and applicability can be used by simply changing the design according to the application. It can be said that this is a configuration.
  • FIG. 5 is a diagram showing a configuration of the temperature sensor 210T for detecting the temperature in the physical quantity sensor 210. As shown in FIG.
  • the temperature sensor 210T includes a plurality of bimetal cantilever sensors 222.
  • the bimetal cantilever sensor 221 has a lever (cantilever) 2 22 made of a bimetal material in which a high linear expansion coefficient material 222a and a low linear expansion coefficient material 22 2b are joined or laminated, and only the base end portion 222c is a base 223.
  • the structure is fixed to the cantilever and supported in a cantilever shape.
  • An electric contact member 2 24 made of a conductive material is disposed with a predetermined gap so as to face the lever 222.
  • the lever 222 made of such a bimetal material swells and deforms around the base end portion 222c according to the temperature change due to the difference in linear expansion coefficient between the high linear expansion coefficient material 222a and the low linear expansion coefficient material 222b.
  • the tip end portion 222d moves in a direction approaching / separating from the electrical contact member 224 and reaches a predetermined temperature, the tip end portion 222d comes into contact with the electrical contact member 224.
  • the low linear expansion coefficient material 222b is usually provided so as to face the electrical contact member 224, and constitutes an electrical contact with the electrical contact member 224. For this reason, the low linear expansion coefficient material 222b needs to be formed of a conductive material.
  • a material other than metal is used as the low linear expansion coefficient material 222b, it is necessary to add a conductive member such as a wiring made of a conductive material to the surface of the lever 222 on the low linear expansion coefficient material 222b side.
  • the lengths of the levers 222 are different from each other. If the materials of the high linear expansion coefficient material 222a and the low linear expansion coefficient material 222b constituting the lever 222 are the same between the bimetal cantilever sensors 221, the lever 222 is located at the same distance from the base end 222c. If so, it will stagnate and deform with the same radius of curvature as the temperature changes. At this time, since the lengths of the levers 222 are different between the bimetal cantilever sensors 221, the longer the lever 222, the greater the displacement of the tip end portion 222d.
  • the difference in the length of the lever 222 between the bimetal cantilever sensors 221 is determined by the measurement pitch when the temperature is measured digitally, in other words, the minimum unit of measurement. Accordingly, it is preferable that the lengths of the levers 222 between the bimetal cantilever sensors 221 are provided with a constant pitch.
  • the length of the lever 222 may be constant, and the gap between the lever 222 and the electrical contact member 224 may be different among the plurality of bimetal cantilever sensors 221.
  • each bimetal cantilever sensor 221 a voltage is applied to the electrical contact member 224, and the lever 222 side is grounded!
  • a signal processing circuit 225 is connected to each bimetal cantilever sensor 221!
  • the electrical contact member 224 is applied with a voltage that is stored by a capacitor (voltage applying unit) 225a.
  • the bimetal cantilever sensor 221 has a voltage that changes when the lever 222 is deformed due to temperature changes and contact is made with the electrical contact member 224, and the voltage changes. This is used as an F / F (Flip Flop) circuit. It is detected by a detection circuit 225b consisting of If the voltage detected by the detection circuit 225b fluctuates, the detection circuit 225b The output signal switches from OFF force to ON or from ON to OFF.
  • the sensor control unit 220 detects that the output signal from the detection circuit 225b has switched from OFF to ON, a certain waiting time elapses (the ON state is maintained when the temperature becomes high). Therefore, the power supply control signal for supplying the power from the power source to the capacitor 225a discharged by the conduction of the lever 222 and the electrical contact member 224 for a certain time is output to the power source.
  • Such a signal processing circuit 225 can be formed in an IC constituting the sensor control unit 220.
  • the temperature sensor 210T having such a configuration, a plurality of sets of bimetal cantilever sensors 221 are provided, and the lengths of the levers 222 are different in a plurality of stages.
  • the lever 222 contacts the electrical contact member 224 and the signal processing circuit 225 detects from the detection circuit 225b. Output signal turns ON.
  • the signal processing circuits 225 of each set sequentially output ON output signals in the order of the length of the lever 222.
  • the sensor control unit 220 when the signal from the detection circuit 225b is switched from OFF to ON, or from ON to OFF, the OFF force, or from ON or from ON to OFF, and the time information thereof are displayed.
  • the information stored in the memory and transmitted at a predetermined timing is transmitted to the control device 160 via the relay station 130.
  • the temperature change is digitally measured by detecting the contact of the plurality of bimetallic levers 222 having different lengths to the electrical contact member 224 using a signal from the detection circuit 225b. It becomes possible to do. At this time, by appropriately setting the difference in the length of the lever 222 between the multiple levers 222, the temperature can be measured with a minimum unit accuracy that is more than necessary. Therefore, the power consumption can be reduced to the minimum. Further, unless the temperature change amount exceeds a certain level, the lever 222 does not contact the electrical contact member 224, and the ON signal is not output. This naturally reduces the power required to output the signal. Further, the data obtained as a result of the measurement in this way is the temperature and time information when the temperature change occurs. In other words, if the temperature change is small, the amount of data transmitted wirelessly can be reduced, which also leads to power saving.
  • the capacitor 225a is charged, and when the lever 222 contacts and discharges the electrical contact member 224, power is supplied to the capacitor 225a. Can be suppressed.
  • the voltage fluctuation generated when the lever 222 contacts / separates the electrical contact member 224 is directly used as the output signal from the detection circuit 225b, so that a digital signal can be output directly and no AD converter is required. It is.
  • Such a temperature sensor 210T can be formed by MEMS technology.
  • a silicon oxide film 261 as a sacrificial layer is deposited on a silicon substrate 260, and a 0.5 m thick Ni (Young) is formed thereon as a high linear expansion coefficient material 222a.
  • the film 262 is produced by sputtering or vapor deposition.
  • a 0.5-inch thick W (Young's modulus 345GPa, linear expansion coefficient 4 ⁇ 5E-6 / ° C) film 263 was formed as a low linear expansion coefficient material 222b by sputtering or vapor deposition. 222 is formed.
  • These films can be processed with an accuracy of m level using a photolithographic method and etching. Make 21 Reen 222s of length 195 111 forces, et al 215 111, changing the length by 1 m. By using photolithography and etching, these levers 222 having different lengths can be manufactured simultaneously.
  • the silicon oxide film 261 in the lower part of the lever 222 having the bimetallic structure is removed, so that the lever 222 can freely operate. Since W and Ni do not dissolve in HF, the lever 222 can be left selectively.
  • a glass plate 264 having a recess 264a having a depth of 5 m is joined to the upper surface of the lever 222, and an electrical contact member 224 is joined to the inside.
  • the glass plate 264 and the electrical contact member 224 are bonded to each other by a two-layer structure consisting of an insulating spacer having a thickness of 5 inches and a substrate on which electrodes are formed. It may be.
  • the W film 263 made of the low linear expansion coefficient material 222b faces the electric contact member 224. Therefore, when the temperature rises, the electric contact member 224 is directed and bent.
  • one end of a bimetal prepared by superposing two layers of material A (thickness ta, Young's modulus Ea, linear expansion coefficient aa) and material B (thickness tb, Young's modulus Eb, linear expansion coefficient ab) is fixed.
  • the cantilever structure has a length L
  • the displacement y due to the temperature change ⁇ at the other end is expressed by the following equation. From this equation, the temperature difference that creates a 5 m displacement at the tip 222d of the lever 222 can be calculated.
  • FIG. 7 shows the calculation results when the Reno 1 222 has a length of 195 to 215 ⁇ m in the temperature sensor 210T having the above-described configuration using Equation 1.
  • the lever 222 without bending force S is manufactured at room temperature (20 ° C)
  • the lever 222 and the electrical contact member 224 come into contact and the switch is turned on.
  • the lever 215 m in length 215 m turns on at a temperature difference of 16.51 ° C (actual temperature 36.51 ° C) with respect to room temperature.
  • the actual temperature range 36 ⁇ 51 ° C to 40.0 ° 7 ° C can be covered at intervals of about 0.2 ° C. This is just equivalent to the response to heat generated by human normal heat, and by using this temperature sensor 210T, it is possible to measure the human body temperature with an accuracy (measurement pitch) of 0.2 ° C. Become.
  • this sensor 120 When this sensor 120 is used for other living bodies, the same design should be performed within the measurement temperature range according to the type of the living body! /.
  • the temperature sensor 210T can be reduced in size and weight by forming the temperature sensor 210T by MEMS technology.
  • levers 222 and the like having different lengths can be formed in a lump so that they can be mass-produced at low cost.
  • the sensor 120 provided with such a temperature sensor 210T can be reduced in size and weight, and at the same time, can save power.
  • the sensor 120 generates electric power by the induced electromotive force when the antenna 250 receives the radio wave transmitted from the relay station 130, and this electric power is supplied to the capacitor unit 230. It is becoming accumulating.
  • a message including measurement data in the sensor 120 is transmitted wirelessly and received by the relay station 130.
  • the communication control unit 240 creates a message including information such as an identifier given to the control chip of the sensor 120 together with the measurement data to be transmitted, and transmits it to the relay station 130. .
  • the frequency of the radio wave transmitted from the relay station 130 for supplying power to the sensor 120 and the radio wave transmitted from the sensor 120 to the relay station 130 for transferring a message including measurement data are the same. They are set differently! /
  • radio power is supplied to a plurality of sensors 120 existing within a range in which the relay station 130 can perform wireless communication, and a message including measurement data is received. It has become possible to do.
  • Each sensor 120 transmits a message including measurement data to the relay station 130 in a predetermined order assigned to each sensor 120 in advance.
  • the individual sensors 120 receive the communication of the relay station 130 force.
  • Standby power is required. Therefore, the standby power can be suppressed by transmitting a message including measurement data from each sensor 120 at a predetermined timing. In order to do this, it is necessary to perform time correction in each sensor 120 to suppress an error in data transmission timing so that communication with one relay station 130 does not interfere between the plurality of sensors 120.
  • the relay station controller 140 uses the relay station 130 force and the radio wave transmitted to supply power to each sensor 120 to correct the time in each sensor 120.
  • Send a command That is, as shown in FIG. 8, in the relay station controller 140, the radio wave transmitted from the relay station 130 to the individual sensors 120 for power supply is stopped as a command at regular intervals. . For example, every time an electric wave is transmitted for one hour, the transmission of the electric wave is stopped for 0.01 seconds.
  • the force of the relay station 130 also receives the radio wave transmitted to the sensor 120 for power supply by the antenna 250.
  • the internal clock Function time correction is performed.
  • each sensor 120 when a message including measurement data measured by the acceleration sensor 21 OA or the temperature sensor 210T is transmitted to the relay station 130, the transmission timing is as described above. At a predetermined timing assigned to
  • FIG. 8 is a chart showing the timing at which a message including measurement data is transmitted to the relay station 130 in one sensor 120. As shown in FIG. 8, the time zone Ts for transmitting a message containing measurement data to the relay station 130 is allocated to the sensor 120 so that the timing is in a predetermined order. Time zones other than the time zone Ts are allocated to the other sensors 120.
  • the start time T1 and the end time T2 are managed by the clock function of the sensor 120 as described above.
  • the time zone Ts is long enough to ensure the error of the built-in clock that can occur even when the time is corrected, and the time that data can be retransmitted if transmission of a message containing measurement data fails. It is preferable to set it.
  • the relay station controller 140 has a function of checking a message including measurement data transmitted from each sensor 120 and determining whether an error has occurred. If an error occurs in the received message, the relay station controller 140 sends a command for requesting retransmission to the sensor 120 that transmitted the message via the relay station 130. ing.
  • This command to request the sensor 120 to retransmit the message is sent from the relay station 130 to each cell. Included in the radio wave transmitted to sensor 120 to supply power.
  • the relay station controller 140 controls the radio wave for supplying power to be transmitted from the relay station 130 to the sensor 120 that needs to retransmit the message within the above-mentioned time zone Ts. It is stopped.
  • the sensor control unit 220 In the sensor 120, when the relay station 130 force is also transmitted to the sensor 120 for power supply and received by the antenna 250 and stops within the time zone Ts, the sensor control unit 220 The message containing is sent again.
  • the acceleration sensor 210A and the temperature sensor 210T as described above have a configuration like a digital switch, and can directly output a measurement result as digital data. Moreover, output indicating that a change has occurred is made only when the change is greater than a certain amount.
  • FIG. 9A shows an example of measurement data transmitted from the sensor 120 to the relay station 130.
  • FIG. 9 (b) is an example of measurement data transmitted from the sensor 120 to the relay station 130 in the case where the conventional sensor, that is, measurement data is transmitted at regular intervals.
  • the senor 120 can be used for purposes other than monitoring the occurrence of avian influenza.
  • the size, sensor type, and output of the communication device may be specially designed according to the purpose of use, such as for aquaculture, livestock, and wild animals.
  • the sensor 120 may be configured such that a battery is provided in the sensor 120 that does not perform power supply by radio waves. Of course, it is also possible to charge the battery at an appropriate timing.
  • the present invention can be applied not only to the aquaculture industry, but also to other livestock farming and health monitoring of wild animals, and prevents large-scale transmission of infectious diseases via wild animals. It can also be used to construct a simple network.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)

Abstract

L'objet de l'invention est un système de senseur radio capable d'économiser de la puissance. Dans un contrôleur de station relais, une onde radio, transmise pour fournir de la puissance depuis une station relais vers chaque senseur, est interrompue à un certain intervalle de temps, et une instruction qui commande d'exécuter une correction de temps dans chaque senseur est transmise. Au moment de l'interruption de l'onde radio qui est transmise depuis la station relais vers chaque senseur pour fournir de la puissance, chaque senseur exécute une correction de temps d'une fonction d'horloge interne. De plus, dans le contrôleur de station relais, quand une erreur s'est produite dans un message contenant des données de mesure qui sont transmises à partir de chaque senseur, l'onde radio qui est transmise pour fournir de la puissance depuis la station relais vers le senseur qui a transmis le message, est interrompue pendant une période de temps prédéterminée de façon à solliciter une retransmission du message.
PCT/JP2007/074062 2006-12-15 2007-12-13 Système de senseur radio, et système de gestion de la santé d'un corps vivant WO2008072712A1 (fr)

Applications Claiming Priority (2)

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JP2006-338267 2006-12-15
JP2006338267A JP4849549B2 (ja) 2006-12-15 2006-12-15 無線式センサシステム、生体の健康管理システム

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WO2008072712A1 true WO2008072712A1 (fr) 2008-06-19

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EP2345145B1 (fr) * 2008-10-08 2016-05-25 Sapurast Research LLC Capteur-émetteur/récepteur incorporé dans une chaussure et alimenté à la force du pied
CN105145394A (zh) * 2015-09-29 2015-12-16 毛茂军 一种基于Zigbee技术的牧场动物跟踪监管系统

Citations (5)

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Publication number Priority date Publication date Assignee Title
JPH0810232A (ja) * 1994-06-29 1996-01-16 Casio Comput Co Ltd 生体情報処理システム
JP2001307268A (ja) * 2000-04-18 2001-11-02 Yokohama Rubber Co Ltd:The 周囲雰囲気中の物理量計測システム
WO2005029436A1 (fr) * 2003-09-19 2005-03-31 Ntn Corporation Systeme de detection sans fil et dispositif d'appui equipe d'un systeme de detection sans fil
JP2005329862A (ja) * 2004-05-21 2005-12-02 Denso Corp タイヤ空気圧検出装置
JP2006027390A (ja) * 2004-07-14 2006-02-02 Nippon Soken Inc タイヤ空気圧検出装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0810232A (ja) * 1994-06-29 1996-01-16 Casio Comput Co Ltd 生体情報処理システム
JP2001307268A (ja) * 2000-04-18 2001-11-02 Yokohama Rubber Co Ltd:The 周囲雰囲気中の物理量計測システム
WO2005029436A1 (fr) * 2003-09-19 2005-03-31 Ntn Corporation Systeme de detection sans fil et dispositif d'appui equipe d'un systeme de detection sans fil
JP2005329862A (ja) * 2004-05-21 2005-12-02 Denso Corp タイヤ空気圧検出装置
JP2006027390A (ja) * 2004-07-14 2006-02-02 Nippon Soken Inc タイヤ空気圧検出装置

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