JP2008204233A - Rfid tag built-in cmc sensor and measurement system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an RFID tag built-in CMC sensor that has high detection sensitivity and can be miniaturized, and a measurement system for simplifying system construction using this. <P>SOLUTION: The RFID tag built-in CMC sensor comprises the RFID tag with a sensor input terminal that receives a command signal for RFID tag communication transmitted from a reader and performs the analysis and recording processing of sensor data corresponding to the command signal, and transmission control of measurement data obtained by the processing, the CMC sensor for receiving a carrier signal transmitted from the reader and sensing micro change based on a modulating signal obtained by dividing the carrier signal with a divider, and a CMC sensor unit formed of a detector for converting a signal output from the CMC sensor into sensor data of appropriate level signal. The RFID tag built-in CMC sensor performs sensor signal processing, and transmits measurement data to the reader by RFID tag communication. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a CMC (Carbon Micro Coil) sensor and a system for measuring body temperature, pulse, blood pressure, etc. of the body using the same.

  In recent years, the population ratio of the elderly has increased due to the declining birthrate and aging population accompanying the decline in the birth rate. The cost of medical care in such an aging society is estimated to be about 32 trillion yen in 2004, about 40 trillion yen in 2010, and about 70 trillion yen in 2025. Among the medical expenses, especially the medical expenses for the elderly are remarkably increased, and the cause is a rise in hospitalized medical expenses and a prolonged hospitalization period. Further, the cause of the long-term hospitalization is that the patient becomes bedridden due to fractures of the femur, stroke, cerebral infarction, and the like.

  In order to receive enhanced medical care for a super-aged society in the future, it is necessary to review the current medical system and insurance system and reduce the bloated medical expenses. For this purpose, we will review daily lifestyle habits to maintain a healthy body and prevent primary injury, and detect early signs to reduce the incidence of bedridden patients. Secondary prevention is necessary. Recently, hypertension, hyperlipidemia, and diabetes caused by visceral fat obesity among lifestyle-related diseases are called conditions that make arteriosclerosis easy to occur, so-called metabolic syndrome, such as myocardial infarction, angina, It has been found to cause serious life-threatening diseases.

  For this reason, the physical condition of people who are at high risk for lifestyle-related diseases (usually those who are healthy bodies but who have been pointed out the risk of developing lifestyle-related diseases through medical examinations, etc.) is 24 hours a day in real time. Early sign detection to reduce the incidence of bedridden patients by predicting the occurrence of lifestyle-related diseases and fractures, etc. by acquiring and managing abnormal signals detected by comparing changes between status and abnormal status A service for performing management is required, and the applicant of the present application has proposed a “disease sign management service” disclosed in Japanese Patent Application No. 2006-213879.

Japanese Patent Application No. 2006-213879

  The sensor attached to each body measurement site described in the above publication is not particularly limited. For example, a thermistor is generally used for measuring body temperature, and a strain gauge is generally used for measuring pulse and blood pressure. However, the conventional sensor has a problem that the detection sensitivity is low and a slight change cannot be measured. Moreover, since there is no flexibility and it is difficult to miniaturize, there is a problem that an uncomfortable feeling occurs when the sensor is directly attached to the skin.

  The present invention has been made in order to solve the above-described problems, and has high detection sensitivity and can easily measure a slight change, and further has flexibility and can be miniaturized. Yes, the CMC sensor with a built-in RFID tag that does not cause a sense of incongruity even when directly attached to the skin, and the system construction is simplified by using the CMC sensor with a built-in RFID tag, and the body temperature, pulse, An object of the present invention is to provide a measurement system that can easily measure blood pressure and the like.

  In order to solve the above problems, the RFID tag built-in CMC sensor of the present invention receives a command signal for RFID tag communication transmitted from a reader, and analyzes and records sensor data corresponding to the command signal. An RFID tag with a sensor input terminal that performs processing and transmission control of measurement data obtained by the processing and a carrier signal transmitted from the reader are received, and the carrier signal is divided by a frequency divider. And a CMC sensor unit comprising a CMC sensor that senses a slight change by the modulated signal and a detector that converts a signal output from the CMC sensor into appropriate level sensor data. By performing sensor signal processing in the CMC sensor and transmitting measurement data to the reader via RFID tag communication, the system Body temperature of the body to simplify the dating, pulse, characterized in that it is possible to easily measure the blood pressure and the like.

  The RFID tag with sensor input terminal includes an antenna and an RFID chip for receiving a command signal for RFID tag communication transmitted from a reader, and a power supply circuit for supplying sensor driving power to the CMC sensor and detector. And an A / D converter for analyzing the sensor data obtained by the CMC sensor and the detector.

  The CMC sensor unit includes an antenna for receiving a carrier signal transmitted from a reader, a frequency divider for dividing the carrier signal to obtain a modulation signal, and a CMC for sensing a slight change by the modulation signal. A sensor and a detector that outputs sensor data of an appropriate level from the phase difference signal or potential difference signal output from the CMC sensor.

  Further, in the measurement system using the RFID tag built-in CMC sensor of the present invention, one or a plurality of RFID tag built-in CMC sensors capable of transmitting measurement data by performing wireless communication with the reader. One unit or a plurality of units are connected to the network according to the scale of the system.

  The reader includes an RFID communication unit for performing wireless communication between the RFID tags with sensor input terminals in the RFID tag built-in CMC sensor and driving of the CMC sensor, a network communication unit for communicating with an external network, It comprises a CPU for controlling each communication unit, a memory, a clock, and a power supply unit.

  The carrier used for wireless communication between the reader and the RFID tag with sensor input terminal in the RFID tag built-in CMC sensor and for driving the CMC sensor in the RFID tag built-in CMC sensor is defined by the Radio Law for RFID communication. Use the same frequency and radio wave transmission level.

  The CMC sensor is formed by uniformly dispersing a helical CMC having a constant coil diameter and coil pitch in an elastomer resin that does not feel uncomfortable even when directly applied to the skin. . The CMC sensor can be easily miniaturized and thinned, and can sense minute pressure changes and temperature changes with high sensitivity by an LCR composite resonance circuit. For example, the pressure detection sensitivity is 0.1 Pa or less, which has an excellent high sensitivity of 1000 to 10,000 times or more than a commercially available tactile sensor.

  According to the RFID tag built-in CMC sensor and measurement system of the present invention, when measuring body temperature, pulse, blood pressure, etc. of the body, the detection sensitivity is high and even a slight change can be easily measured. Furthermore, it is flexible and can be miniaturized, and there is an effect that it does not cause a sense of incongruity even when directly applied to the skin. In addition, the carrier frequency used for the wireless communication between the reader and the RFID tag with a sensor input terminal in the CMC sensor with a built-in RFID tag and the driving of the CMC sensor is unified with the frequency defined by the Radio Law for RFID communication. The number of installations can be reduced, and the system construction can be simplified.

  The best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic circuit block diagram of a CMC sensor with a built-in RFID tag according to the present invention. A CMC sensor 3 with a built-in RFID tag receives a command signal for RFID tag communication transmitted from a reader, and the command signal Corresponding to the RFID tag 4 with sensor input terminal for performing sensor data analysis and recording processing and transmission control of measurement data obtained by the processing, and receiving the carrier signal transmitted from the reader, A CMC sensor 12 that performs slight change sensing using a modulation signal obtained by dividing the signal by the frequency divider 11, and a detector 13 that converts a signal output from the CMC sensor 12 into sensor data of an appropriate level. The CMC sensor unit 6 is configured to perform sensor signal processing in the RFID tag built-in CMC sensor 3, and the RFID tag Transmitting the measured data to the reader at grayed communication.

  The RFID tag 4 with sensor input terminal supplies the sensor driving power supply 10 to the antenna 5 and the RFID chip 8 for receiving the RFID tag communication command signal transmitted from the reader, and the CMC sensor 12 and the detector 13. Power supply circuit and an A / D converter 9 for analyzing sensor data obtained by the CMC sensor 12 and the detector 13. The A / D converter 9 may be integrated in the RFID chip 8.

  The CMC sensor unit 6 includes an antenna 7 for receiving a carrier signal transmitted from a reader, a frequency divider 11 for dividing the carrier signal to obtain a modulation signal, and sensing a slight change by the modulation signal. And a detector 13 that outputs sensor data of an appropriate level from the phase difference signal or the potential difference signal output from the CMC sensor 12.

  Next, FIG. 2 is a schematic configuration diagram of a measurement system using the RFID tag built-in CMC sensor of the present invention. The measurement system can transmit measurement data by performing wireless communication with the reader 1 and the reader 1. One unit is composed of one to a plurality of RFID tag built-in CMC sensors 3, and one unit or a plurality of units are connected to a network depending on the scale of the measurement system. The network is generally the Internet or an intranet, but is not particularly limited. If it is small, it may be a stand-alone. The RFID tag built-in CMC sensor 3 has a structure that can be directly attached to a location where body temperature, pulse, blood pressure, etc. of the body are measured. Therefore, the RFID tag 4 with a sensor input terminal in the RFID tag built-in type CMC sensor 3 is preferably a batteryless type that performs a passive operation.

  Next, FIG. 3 is a schematic circuit block diagram of a reader used in a measurement system using the RFID tag built-in CMC sensor of the present invention. The reader 1 is an RFID tag with a sensor input terminal in the RFID tag built-in CMC sensor 3. An antenna 2 and an RFID communication unit 14 for performing wireless communication with each other and driving of the CMC sensor 12, a network communication unit 16 for communicating with a network, and a CPU 15 for controlling each of the communication units , Memory 17, clock 18 and power supply unit 19.

  The carrier used for wireless communication between the reader 1 and the RFID tag 4 with a sensor input terminal in the RFID tag built-in CMC sensor 3 and for driving the CMC sensor 12 in the RFID tag built-in CMC sensor 3 is used for RFID communication. The frequency and radio wave transmission level defined by the Radio Law are used, and for example, the 953 MHz band is suitable. The 953 MHz band is a frequency used in remote RFID tag communication, and the communication distance is about 3 to 5 m even in passive operation.

  FIG. 4 is an operation principle diagram in the case where the detector in FIG. 1 is a phase detector. In this case, when a reference signal is input to one input terminal of the detector 13 and a measurement signal is input to the other input terminal, the signal level is appropriately adjusted by the built-in log amplifier, and then the phase difference between the two signals is calculated. Thus, an analog signal (voltage signal) is output. As this type of IC, for example, there is AD8302 of Analog Devices, Inc., and the phase difference measurement range is -180 to + 180 °, and it is common not to distinguish the difference of ± 90 °. The range is 0 to + 180 ° centered on 0 to −180 ° or + 90 °. The output voltage is 0 to 1.8 V in the range of −180 to 0 °, 1.8 V to 0 V in the range of 0 to + 180 °, and one of the phase ranges is used. Thus, the detector 13 uses the IC or an IC having an equivalent function.

  FIG. 5 is a circuit block diagram of a first embodiment of an RFID tag with a sensor input terminal in a CMC sensor with a built-in RFID tag according to the present invention. The RFID tag 4 with a sensor input terminal receives sensor data from a CMC sensor unit 6 as A. An RFID chip 8 having a function of inputting serial data obtained by conversion into measurement data by the / D converter 9 and transmitting it to the reader 1 by a read command, and an antenna 5 connected to the RFID chip 8 Configure.

  Since the antenna 5 performs radio communication with the reader 1 by electromagnetic waves, the antenna 5 is connected to a tuning circuit 20 including a tuning capacitor (not shown) inside the RFID chip 8 or partly outside the RFID chip 8, and has a carrier frequency such as a 953 MHz band. A resonance circuit is formed by tuning.

  In the subsequent stage of the tuning circuit 20, the voltage waveform of the induced electromotive force generated when the electromagnetic wave output from the antenna 2 of the reader 1 passes through the antenna 5 of the RFID tag 4 with the sensor input terminal is detected. A rectifier circuit 21 is connected to extract a DC voltage by rectifying the electromotive force by half wave or full wave.

  Next, after the rectifier circuit 21, a clock generation circuit 22 for dividing the detected carrier to generate a system clock, and a demodulation operation for extracting a signal from the carrier at the time of signal reception are performed. A modulation / demodulation circuit 23 for performing a modulation operation by a switching element (not shown) during transmission, stabilizes the DC voltage, supplies circuit power to the RFID chip 8 and peripheral circuits, and charges the charging capacitor 25. A power supply circuit 24 for supplying voltage is connected. The power supply circuit 24 is also used to supply a sensor driving power supply 10 that drives the CMC sensor unit 6.

  Next, after the modulation / demodulation circuit 23, control of the modulation / demodulation circuit 23 and ID data and measurement data of the RFID chip 8 with respect to FRAM (Ferroelectric RAM: a registered trademark of Ramtron, USA) 27 which is a nonvolatile memory, A logic circuit 26 for performing writing or reading control is connected. The logic circuit 26 is provided with terminals for a clock signal (CLK) and a serial input signal (SI) for inputting serial data obtained by the external A / D converter 9.

  The FRAM 27 is a ferroelectric nonvolatile memory, and the ID data, measurement data, etc. of the RFID chip 8 are not lost even when the circuit power is turned off. In addition, since the data write voltage does not need to be boosted to a high voltage unlike an EEPROM or a flash memory, the booster circuit is simplified. Further, the writing or reading speed is equivalent to that of DRAM, and is characterized by being much faster than EEPROM and flash memory. Thus, although FRAM27 is suitable as a non-volatile memory, you may use another memory.

  FIG. 6 is a circuit block diagram of a second embodiment of the RFID tag with a sensor input terminal in the CMC sensor with a built-in RFID tag of the present invention, which is basically the same as the first embodiment, The only difference is that the A / D converter 9 is incorporated as an A / D conversion circuit 28. In this case, the A / D conversion circuit 28 is provided with an analog input signal (Ai) terminal for inputting sensor data obtained by the CMC sensor unit 6. In any of the embodiments, the sensor data is A / D converted after being scaled to an appropriate level by a scaler amplifier (not shown) built in the A / D converter 9 or the A / D conversion circuit 28. Measurement data can be obtained. If the A / D converter 9 or the A / D converter circuit 28 has a plurality of input terminals, the same number of CMC sensor units 6 can be prepared to measure body temperature, pulse, blood pressure, etc. at once. It becomes possible.

  Next, an outline of the operation of the measurement system will be described using a flowchart.

  FIG. 7 is a flowchart at the start of measurement of the measurement system using the RFID tag built-in CMC sensor of the present invention. In the operation, first, a measurement start command is transmitted from the RFID communication unit 14 in the reader 1 to the RFID tag built-in CMC sensor 3. (Step S1-1) The command signal is a modulated wave in which a Manchester code is superimposed on a carrier.

  Next, the command signal is received by the antenna 5 of the RFID tag 4 with a sensor input terminal in the CMC sensor 3 with a built-in RFID tag. (Step S1-2) At this time, the modulation signal resonates in the tuning circuit 20 in the antenna 5 and the RFID chip 8, and an induced electromotive force is generated. Therefore, the induced electromotive force is charged into the charging capacitor 25 from the power supply circuit 24 in the RFID chip 8 to obtain the sensor driving power supply 10 for driving the RFID chip 8, the peripheral circuit power supply, and the CMC sensor unit 6. (Step S1-3)

  Next, the command signal is also received by the antenna 7 of the CMC sensor unit 6 in the RFID tag built-in CMC sensor 3 and is divided by the frequency divider 11 to generate a modulation signal. (Step S1-4) The modulation signal is used as a drive signal for the CMC sensor 12 and input to the detector 13 as a reference signal. (Step S1-5) Next, the CMC sensor 12 senses a minute change of the object, and the obtained measurement signal is input to the detector 13 in the same manner. (Step S1-6)

  Next, the sensor data obtained by the detector 13 is input to the A / D converter 9 in the RFID tag 4 with the sensor input terminal or the A / D conversion circuit 28 built in the RFID chip 8, and the measurement data As digital data. (Step S1-7) Thereafter, the measurement data is written into the FRAM 27 under the control of the logic circuit 26 in the RFID chip 8. (Step S1-8) As described above, the body temperature, pulse, blood pressure, etc. of the body are measured by the RFID tag built-in CMC sensor 3.

  FIG. 8 is a flowchart at the time of reading measurement data of the measurement system using the RFID tag built-in CMC sensor of the present invention. In the operation, first, a data read command is transmitted from the RFID communication unit 14 in the reader 1 to the RFID tag built-in CMC sensor 3. (Step S2-1)

  Next, the command signal is received by the antenna 5 of the RFID tag 4 in the CMC sensor 3 with a built-in RFID tag. (Step S2-2)

  Next, the measurement data is read from the FRAM 27 under the control of the logic circuit 26 in the RFID chip 8. (Step S2-3)

  Next, data is read by modulating the carrier signal with the measurement data and responding to the reader 1. (Step S2-4)

  As described above, since the RFID tag 4 with sensor input terminal and the CMC sensor unit 6 in the CMC sensor 3 with a built-in RFID tag perform wireless communication with the same reader 1, a measurement system that simplifies the system construction is obtained. Will be.

  In the above description, the measurement system that simplifies the system construction by using the RFID tag built-in CMC sensor 3 and can easily measure the body temperature, pulse, blood pressure, etc. of the body has been described. For example, if a building structure or machine is used, a measurement system capable of easily detecting minute vibrations, distortions and temperature changes of the building structure or machine can be obtained. Thus, the RFID tag built-in CMC sensor and measurement system of the present invention can be applied to all measurement systems.

It is a schematic circuit block diagram which comprises the RFID tag built-in type CMC sensor of this invention. It is a schematic block diagram of the measurement system using the RFID tag built-in type CMC sensor of this invention. It is a schematic circuit block diagram of the reader used in the measurement system using the RFID tag built-in type CMC sensor of the present invention. FIG. 2 is an operation principle diagram when the detector in FIG. 1 is a phase detector. 1 is a circuit block diagram of a first embodiment of an RFID tag with a sensor input terminal in a CMC sensor with a built-in RFID tag of the present invention. It is a circuit block diagram of the 2nd Example of the RFID tag with a sensor input terminal in the RFID tag built-in type CMC sensor of this invention. It is a flowchart at the time of a measurement start of the measurement system using the RFID tag built-in type CMC sensor of this invention. It is a flowchart at the time of the measurement data read-out of the measurement system using the RFID tag built-in type CMC sensor of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reader 2 Antenna 3 CMC sensor with built-in RFID tag 4 RFID tag with sensor input terminal 5 Antenna 6 CMC sensor unit 7 Antenna 8 RFID chip 9 A / D converter 10 Power supply for sensor 11 Divider 12 CMC sensor 13 Detector 14 RFID communication unit 15 CPU
16 Network Communication Unit 17 Memory 18 Clock 19 Power Supply Unit 20 Tuning Circuit 21 Rectification Circuit 22 Clock Generation Circuit 23 Modulation / Demodulation Circuit 24 Power Supply Circuit 25 Charging Capacitor 26 Logic Circuit 27 FRAM
28 A / D conversion circuit

Claims (7)

  In the RFID tag built-in CMC sensor, the RFID tag communication command signal transmitted from the reader is received, sensor data analysis and recording processing corresponding to the command signal, and measurement obtained by the processing are performed. An RFID tag with a sensor input terminal for controlling transmission of data and a carrier signal transmitted from the reader are received, and a slight change is sensed by a modulation signal obtained by dividing the carrier signal by a frequency divider. A CMC sensor to be performed and a CMC sensor unit including a detector that converts a signal output from the CMC sensor into appropriate level sensor data, and performs sensor signal processing in the RFID tag built-in CMC sensor, By sending measurement data to the reader via RFID tag communication, system construction is simplified and body temperature and pulse And characterized in that it can be easily measured blood pressure, etc., RFID tags embedded CMC sensors and measurement systems.   The RFID tag with sensor input terminal includes an antenna and an RFID chip for receiving a command signal for RFID tag communication transmitted from a reader, and a power supply circuit for supplying sensor driving power to the CMC sensor and detector. An RFID tag built-in type CMC sensor according to claim 1, wherein the CMC sensor and the A / D converter for analyzing sensor data obtained by the detector are used. Measuring system.   The CMC sensor unit includes an antenna for receiving a carrier signal transmitted from a reader, a frequency divider for dividing the carrier signal to obtain a modulation signal, and a CMC for sensing a slight change by the modulation signal. 2. The RFID tag built-in type CMC sensor according to claim 1, comprising a sensor and a detector that outputs sensor data of an appropriate level from a phase difference signal or a potential difference signal output from the CMC sensor. And measuring system.   In the measurement system using the RFID tag built-in type CMC sensor, the reader is constituted by one or more RFID tag built-in type CMC sensors capable of transmitting measurement data by wireless communication with the reader. 4. The RFID tag built-in CMC sensor and measurement system according to any one of claims 1 to 3, wherein one unit or a plurality of units are connected to a network depending on the scale of the system.   The reader includes an RFID communication unit for performing wireless communication between the RFID tags with sensor input terminals in the RFID tag built-in CMC sensor and driving of the CMC sensor, a network communication unit for communicating with an external network, 5. The RFID tag built-in type CMC sensor and measurement system according to claim 1, comprising a CPU for controlling each of the communication units, a memory, a clock, and a power supply unit. .   The carrier used for the wireless communication between the reader and the RFID tag with a sensor input terminal in the RFID tag built-in CMC sensor and the driving of the CMC sensor in the RFID tag built-in CMC sensor is a frequency determined by the Radio Law for RFID communication. The RFID tag built-in CMC sensor and measurement system according to any one of claims 1 to 5, wherein a radio wave transmission level is used.   The RFID tag built-in type CMC sensor and measurement system according to any one of claims 1 to 6, wherein the RFID tag with a sensor input terminal is a battery-less type.

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