JP2009162700A - Temperature sensor, and temperature sensor management device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the weight of a radio temperature sensor, to miniaturize it, and to mount a temperature sensor function to an electronic tag constituted by an antenna of an electric wave type at low cost. <P>SOLUTION: In the radio temperature sensor, an antenna made of a shape memory alloy is used, the antenna made of the shape memory alloy recovers the antenna shape at a temperature of a transformation point or higher, and the effective gain and polarization wave of the antenna vary. Temperature variation is detected as the variation in the effective gain and the polarization wave of the antenna. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a temperature sensor that detects a temperature change including the temperature itself. Among them, the present invention relates to a wireless temperature sensor and a wireless temperature sensor system having an antenna, and more particularly to an antenna of a wireless temperature sensor using a member made of a shape memory alloy.

  2. Description of the Related Art In recent years, a sensor network information system that can acquire environmental temperature information with a temperature sensor and can be integratedly managed on a network has attracted attention. As a method for acquiring temperature information, a method has been proposed in which a member made of a shape memory alloy is used and the temperature is detected by utilizing the change in the shape of the member at a temperature equal to or higher than the shape recovery temperature.

  For example, having a member made of a soft magnetic material inside a member made of a shape memory alloy, when the shape recovery temperature stored in the member made of the shape memory alloy is reached, the shape of the member made of the shape memory alloy is recovered, Along with this, the shape of the member made of the soft magnetic material changed, and the change in inductance accompanying the change of the demagnetizing field due to the shape change of the member made of the soft magnetic material was wound around the outside of the member made of the shape memory alloy. A temperature sensor (see Patent Document 1) that transmits to a copper wire coil and knows the temperature from the inductance change from the copper wire coil has been proposed.

  Examples of utilizing the shape recovery effect of the shape memory alloy include an extension structure for extending space structures such as antennas and solar cell paddles in a spacecraft (see Patent Document 2).

Japanese Patent Application No. 6-114678 JP-A-9-277996

However, the temperature sensor based on the above prior art has a problem that it is difficult to reduce the weight and size because it uses a magnetic material and a coil.
In addition, in recent years, radio-frequency passive electronic tags based on international standards have become widespread, and there is a demand from the market to mount a temperature sensor function on this electronic tag. The mounting of the temperature sensor of the prior art on the electronic tag is a high cost factor because it uses a magnetic material and a coil.

  It is an object of the present invention to provide a wireless temperature sensor that can be easily reduced in weight and size, and to be equipped with a temperature sensor function at a low cost in an electronic tag configured with a radio wave antenna.

  The present invention detects a change in temperature using a radio wave characteristic that changes with a change in shape of a member based on a change in temperature. The detection of the temperature change includes measuring the temperature.

  The present invention also includes detecting a temperature change using at least one of an effective gain and a polarization of an antenna that constitutes an electronic component accompanying a temperature change. In this case, a shape memory alloy is used for the antenna, and the temperature change is detected by detecting the characteristic that changes with the shape change of the antenna according to the temperature change. In this case, the temperature change detection also includes temperature measurement.

  In a more specific aspect of the present invention, an antenna made of a shape memory alloy is used, and the effective gain and polarization of the antenna are changed by recovering the antenna shape at a temperature equal to or higher than the transformation point. The wireless temperature sensor is characterized in that a temperature change is detected as a change in effective gain and polarization of the antenna of the wireless temperature sensor.

Further, in the present invention, in order to perform the temperature status management of the wireless temperature sensor,
A communication device for performing wireless communication with the wireless temperature sensor;
A storage device storing communication conditions with the wireless temperature sensor at each temperature below the transformation point and above the transformation point;
A process of determining the ambient temperature where the wireless temperature sensor is installed by comparing a communication result when wirelessly communicating with the wireless temperature sensor and a communication condition with the wireless temperature sensor in the storage device. An arithmetic unit to
With a wireless temperature sensor management device comprising
The wireless temperature sensor management device wirelessly communicates with the wireless temperature sensor through the communication device, and the communication result and the wireless temperature sensor at each temperature below the transformation point and above the transformation point stored in the storage device. Compare with communication conditions,
If the communication result matches the communication conditions at the temperature below the transformation point, determine that the ambient temperature of the wireless temperature sensor is below the transformation point,
If the communication result matches the communication conditions at the temperature above the transformation point, by determining that the ambient temperature of the wireless temperature sensor is the temperature above the transformation point,
A technique for detecting the ambient temperature of the wireless temperature sensor is also included.

  Note that one embodiment of the present invention includes a change in radio wave characteristics due to a change in a relationship including a contact relationship with another member due to deformation of a member including an antenna. For example, the length (size) of the antenna is changed in a pseudo manner by connecting to another antenna due to deformation of the member, and the radio wave characteristic that changes along with this is detected to detect the temperature change.

  According to the present invention, it is possible to share a member for temperature detection with another member, and the size of the apparatus can be reduced.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 and FIG. 2 are schematic views relating to the first embodiment of the wireless temperature sensor of the present invention.
FIG. 1 is an overview of the wireless temperature sensor at a temperature above the transformation point, and FIG. 2 is an overview of the wireless temperature sensor at a temperature below the transformation point.

  The antenna member 3 is made of a shape memory alloy made of NiTi alloy, and based on the desired transformation temperature, that is, the shape recovery temperature, utilizing the fact that the transformation temperature changes sensitively to the alloy composition, heat treatment conditions, etc. Decide the rate and apply heat treatment. For example, when the desired shape recovery temperature is 40 ° C., the Ni content may be 56% and heat treatment at 480 ° C. may be applied.

  As shown in FIG. 1, when the shape of the antenna member 3 is recovered at a temperature equal to or higher than the transformation point, the shape is memorized so that the antenna member 3 is deformed linearly and comes into contact with the antenna member 2. At this time, the total length of the antenna portion of the wireless temperature sensor is about one half of the wavelength of the radio wave used by the wireless temperature sensor.

  Further, as shown in FIG. 2, the antenna member 3 is bent at a temperature equal to or lower than the transformation point. In addition, you may make it deform | transform into another suitable shape here. In this state, an interval of 1/6 wavelength or more of the radio wave used by the wireless temperature sensor is opened between the antenna member 3 and the antenna member 2 so that the antenna member 2 is not electrically affected.

  The antenna member 2 is joined to the IC chip 1 of the wireless temperature sensor, and the length of the antenna member 2 in the major axis direction is about 1/10 of the wavelength of the radio wave used by the wireless temperature sensor. For this reason, if it is a short distance, it can communicate with the radio | wireless communication apparatus which manages a radio | wireless temperature sensor.

  The wireless temperature sensor case 4 is a case for protecting the antenna of the wireless temperature sensor and the IC chip 1 and is made of an insulator.

  The impedance matching between the antenna of the wireless temperature sensor and the IC chip 1 is designed so that matching can be achieved at a temperature above the transformation point. That is, impedance matching is performed in a state where the antenna member 2 and the antenna member 3 are in contact with each other as shown in FIG.

  At this time, since the total length of the antenna portion of the wireless temperature sensor is about one half of the wavelength of the radio wave used by the wireless temperature sensor, the antenna of the wireless temperature sensor is a half-wave dipole matched with the IC chip 1. Operates as an antenna.

  At a temperature below the transformation point, as shown in FIG. 2, the antenna member 3 is in a bent state and is not in contact with the antenna member 2, so that the effective length of the antenna portion with respect to the wavelength of the radio wave is small. Since it is too short, the directivity gain is lower than that of a general half-wave dipole antenna.

  In addition, when the antenna member 2 and the antenna member 3 are in contact with each other, since the impedance of the antenna of the wireless temperature sensor and the impedance of the IC chip 1 are matched, as shown in FIG. In a non-contact state, the impedance of the antenna of the wireless temperature sensor and the IC chip 1 are also mismatched.

  Because the directivity gain is reduced and the impedance is mismatched, that is, the execution gain is reduced, the communication performance of the wireless temperature sensor is significantly reduced, and it communicates only with a wireless communication device that manages the wireless temperature sensor at a short distance. become unable.

  On the other hand, at a temperature equal to or higher than the transformation point, as shown in FIG. 1, the antenna member 3 recovers its shape and deforms linearly and comes into contact with the antenna member 2, so that the impedance of the antenna of the wireless temperature sensor and the IC chip 1 is In addition to being matched, since it operates as a half-wave dipole antenna, the directivity gain is also improved compared to the state of FIG.

  Because the directivity gain is improved and the impedance is matched, that is, the execution gain is improved, the communication performance of the wireless temperature sensor is remarkably improved, so that it can communicate with a wireless communication device that manages the wireless temperature sensor at a long distance. Become.

  As described above, with the shape recovery of the shape memory alloy due to the temperature change, the temperature change can be detected as the change in the communication distance performance due to the change in the effective gain of the wireless temperature sensor.

  In addition, since it can communicate in a short distance at the temperature below the transformation point, it can be determined whether or not the wireless temperature sensor has failed.

  Note that by shortening the length of the antenna member 2 in the major axis direction, it may not be possible to communicate at a temperature below the transformation point.

  Next, a second embodiment of the present invention will be described. FIG. 3 and FIG. 4 are overview diagrams regarding the second embodiment of the wireless temperature sensor of the present invention.

FIG. 3 is an overview of the wireless temperature sensor at a temperature above the transformation point, and FIG. 4 is an overview of the wireless temperature sensor at a temperature below the transformation point.
The antenna member 23 is made of a shape memory alloy made of NiTi alloy,
As shown in FIG. 3, when the shape of the antenna member 23 is recovered at a temperature equal to or higher than the transformation point, the shape is memorized so that the antenna member 23 is deformed linearly and comes into contact with the antenna member 22. At this time, the total length of the antenna portion of the wireless temperature sensor is about one half of the wavelength of the radio wave used by the wireless temperature sensor.

Further, as shown in FIG. 4, the antenna member 23 is bent at a temperature equal to or lower than the transformation point. In this state, an interval of 1/6 wavelength or more of the radio wave used by the wireless temperature sensor is opened between the antenna member 23 and the antenna member 22 so that the antenna member 22 is not electrically affected.
The antenna member 22 is joined to the IC chip 21 of the wireless temperature sensor, and the length of the antenna member 22 in the long axis direction is set to about 1/10 of the wavelength of the radio wave used by the wireless temperature sensor.

  The wireless temperature sensor case 24 is a case for protecting the antenna of the wireless temperature sensor and the IC chip 21 and is made of an insulator.

  The spring 25 is a tension spring made of an insulator, and is coupled to a contact portion of the antenna member 23 with the antenna member 22. The tension of the spring 25 is processed so as to be weaker than the generation force of the shape memory alloy of the antenna member 23 at a temperature equal to or higher than the transformation point and higher than the generation force of the shape memory alloy of the antenna member 23 at a temperature lower than the transformation point. deep. The spring 25 may be formed of a shape memory alloy with a conductor. In this case, an insulator may be interposed between the spring 25 and the antenna member 23, or the spring 25 may be configured as a part of the antenna.

  The impedance matching between the antenna of the wireless temperature sensor and the IC chip 21 is designed so that matching can be achieved at a temperature above the transformation point. That is, impedance matching is performed in a state where the antenna member 22 and the antenna member 23 shown in FIG.

  At a temperature below the transformation point, as shown in FIG. 4, the antenna member 23 is in a bent state and is not in contact with the antenna member 22, so that the effective length of the antenna portion is not affected by the wavelength of the radio wave. Since it is too short, the directivity gain is lower than that of a general half-wave dipole antenna.

  Further, since the antenna member 22 and the antenna member 23 are not in contact with each other, the impedances of the antenna of the wireless temperature sensor and the IC chip 21 are also mismatched.

  Therefore, since the execution gain decreases, the communication performance of the wireless temperature sensor decreases, and communication with the wireless communication device that manages the wireless temperature sensor becomes impossible, or communication becomes possible only at a short distance.

  It should be noted that at a temperature below the transformation point, the tension is not (almost) applied since the spring 25 is not stretched.

  On the other hand, at a temperature equal to or higher than the transformation point, as shown in FIG. 3, the antenna member 23 recovers its shape and deforms linearly and comes into contact with the antenna member 22. In addition to being matched, since it operates as a half-wave dipole antenna, the directivity gain is also improved compared to the state of FIG.

Since the execution gain is improved, the communication performance of the wireless temperature sensor is remarkably improved, and communication with a wireless communication device that manages the wireless temperature sensor can be performed at a long distance.
At a temperature equal to or higher than the transformation point, the spring 25 is stretched and tension is applied to the contact portion of the antenna member 23 with the antenna member 22. However, as shown in FIG. The spring 25 and the antenna member 23 maintain the extended shape. At this time, maintaining the extended shape includes a change in shape within a predetermined range.

  On the other hand, when the temperature is lowered to a temperature equal to or lower than the transformation point from the above state, the tension of the spring 25 becomes stronger than the generated force of the antenna member 23, so the spring 25 and the antenna member 23 are bent and contracted as shown in FIG. .

  As described above, the antenna shape of the wireless temperature sensor changes reversibly due to temperature changes, and the effective gain also changes accordingly. As a result, the communication distance performance changes reversibly. That is, the temperature change around the wireless temperature sensor can be detected by the change in the communication distance performance.

  The spring 25 may be a shape memory alloy instead of an insulator, and the temperature of the transformation point of the spring 25 is higher than the temperature of the transformation point of the antenna member 23 so that the generated force of the spring 25 is stronger than the generated force of the antenna member 23. The antenna member 23 shown in FIG. 4 may be returned to a bent shape by applying heat above the transformation point of the spring 25 by processing.

Next, a third embodiment of the present invention will be described. 5, FIG. 6, and FIG. 7 are schematic views relating to the third embodiment of the wireless temperature sensor of the present invention. In each figure, the vertical direction in the drawing is the vertical direction.
The antenna member 7 and the antenna member 8 are made of a shape memory alloy made of NiTi alloy, and are joined to the IC chip 6 of the wireless temperature sensor. The length of the antenna member 7 and the antenna member 8 is about one-fourth of the wavelength of the radio wave used by the wireless temperature sensor when the antenna is linear, and the length of the radio wave used when the antenna is bent. Process to 1/20 or less.

  When the shape of the antenna member 7 is recovered at a temperature equal to or higher than the transformation point, the shape of the antenna member 7 is memorized so as to be a bent structure having a length of 1/20 or less of the wavelength of the radio wave to be used. This bent structure functions as a tension spring at a temperature above the transformation point. On the other hand, the shape of the antenna member 8 is memorized so as to be linear when the shape is recovered at a temperature equal to or higher than the transformation point.

  The Ni content and the heat treatment method of the antenna member 7 and the antenna member 8 are applied so that the transformation points have different temperatures. Specifically, in this embodiment, the desired temperatures to be discriminated are 40 ° C. and 90 ° C. In this case, since the temperature of the transformation point of the antenna member 7 is 90 ° C., the Ni content is set to 54.6% and heat treatment at 480 ° C. is performed. On the other hand, since the temperature of the transformation point of the antenna member 8 is 40 ° C., the Ni content is set to 56% and heat treatment at 480 ° C. is performed.

  The spring 9 is a tension spring made of an insulator. The tension of the spring 9 is weaker than the generation force of the shape memory alloy of the antenna member 7 at a temperature equal to or higher than the transformation point, and the shape memory of the antenna member 9 at a temperature lower than the transformation point. It is processed so that it is stronger than the generated force of the alloy.

  The spring 10 is a compression spring made of an insulator. The repulsive force of the spring 10 is weaker than the generation force of the shape memory alloy of the antenna member 8 at a temperature above the transformation point, and the shape of the antenna member 8 at a temperature below the transformation point. It is processed so as to be stronger than the generation force of the memory alloy.

  The wireless temperature sensor case 11 is a case for protecting the antenna and IC chip of the wireless temperature sensor and is made of an insulator.

  In the low temperature region of 40 ° C. or lower, the antenna member 7 becomes a straight line because it is pulled by the spring 9 because the temperature is lower than the transformation point of the antenna member 7 and the antenna member 8, and the antenna member 8 is compressed by the spring 10. As a result, the antenna has a folded structure and has a length of one-twentieth or less of the wavelength of the radio wave to be used. Therefore, the antenna of the wireless temperature sensor operates as a vertically polarized antenna.

  In the intermediate temperature range of 40 ° C. or higher and 90 ° C. or lower, the temperature is equal to or lower than the transformation point of the antenna member 7. Since the temperature is equal to or higher than the transformation point of the antenna member 8, the antenna member 7 is pulled by the spring 9. However, the antenna member 8 changes to a linear shape because the generated force of the shape memory alloy is stronger than the repulsive force of the spring 10. For this reason, the antenna of the wireless temperature sensor operates as a cross-dipole antenna that operates in both vertical polarization and horizontal polarization.

  In the high temperature region of 90 ° C. or higher, the antenna member 7 has a temperature higher than the transformation point of the antenna member 7 and the antenna member 8. Has a folded structure. On the other hand, the antenna member 8 maintains a linear shape because the generation force of the shape memory alloy is stronger than the repulsive force of the spring 10. For this reason, the antenna of the wireless temperature sensor operates as a horizontally polarized antenna.

  As described above, the antenna shape of the wireless temperature sensor changes reversibly in each of the three temperature regions, and the polarization differs for each antenna shape. By detecting this difference in polarization, the temperature around the wireless temperature sensor can be detected in three stages.

As a method for detecting the difference in polarization, a horizontal polarization antenna and a linear polarization antenna are prepared on the side of the radio communication device managing the radio temperature sensor, and the radio temperature sensor is used for both antennas. Can be detected by which antenna can communicate with the wireless temperature sensor. For example, when communication can be performed only with a horizontally polarized antenna, it can be seen that the wireless temperature sensor is horizontally polarized.
The antenna member 3, the antenna member 23, the antenna member 7, and the antenna member 8 made of shape memory alloy are not limited to NiTi alloys, but may be NiTiCu alloys or NiTiCo alloys.

The antenna member 3, the antenna member 23, the antenna member 7, and the antenna member 8 made of shape memory alloy may be plated with aluminum or copper in order to improve electrical conductivity.
The bent shape of the antenna member 3, the antenna member 7, and the antenna member 8 is an example of the present embodiment, and can be variously changed without departing from the gist thereof.

  In the second embodiment and the third embodiment, instead of using a spring, the shape can be memorized not only on the high temperature side but also on the low temperature side. Shape memory alloys may be used.

  Note that the method of detecting the polarization of the wireless temperature sensor on the wireless communication device side managing the wireless temperature sensor in the example of the third embodiment is an example of the present embodiment. Various changes can be made without departing from the scope.

Next, an embodiment of the wireless temperature sensor management device of the present invention will be described with reference to the drawings.
FIG. 8 is a configuration diagram of the wireless temperature sensor management device according to the present embodiment.
The wireless temperature sensor management device 100 in the present embodiment is a device that manages the status of the wireless temperature sensor. In the present embodiment, an example in which a communication function including an antenna is integrated will be described below.
The wireless temperature sensor management device 100 is a program stored in a storage device 101 such as a non-volatile memory in order to realize the function of executing the wireless temperature sensor management method of the present invention for the wireless temperature sensor 200 of the present invention. 102 is read into the memory 103 and executed by the CPU 104 which is an arithmetic unit.

  The wireless temperature sensor management device 100 is connected to an input interface 105 such as various buttons and network connectors generally provided in a computer device, an output interface 106 such as an LED, display, and network connector, and the wireless temperature sensor 200. The wireless communication interface 130 for carrying out wireless communication and the antenna 131 are provided. In this embodiment, the antenna 131 is an antenna that can switch between circularly polarized wave, vertically polarized wave, and horizontally polarized wave.

  Next, the functional unit of the wireless temperature sensor management device 100 will be described. The wireless temperature sensor management device 100 stores the communication distance between the area where the wireless temperature sensor 200 exists and the antenna 131 in the storage device 101, and can use it.

When communicating with the wireless temperature sensor 200, the wireless temperature sensor management device 100 includes a communication condition setting unit 110 that controls antenna power, sets effective radiation power, and sets the polarization of the antenna 131.
In addition, the wireless temperature sensor management device 100 relates to whether or not communication is successful when communicating with the wireless temperature sensor 200, and when the communication is successful, the wireless temperature sensor 200 stored in the wireless temperature sensor 200 to be communicated. Reads information on effective gain and polarization at temperatures below the transformation point, information on effective gain and polarization at temperatures above the transformation point, and reversibility information on the thermal deformation of the antenna of the wireless temperature sensor. 103 includes a sensor information acquisition unit 111 stored in 103.

  Further, the apparatus 100 determines a temperature state of the wireless temperature sensor 200 based on communication conditions when communicating with the wireless temperature sensor and wireless temperature sensor information acquired from the wireless temperature sensor. A determination unit 112 is provided.

As a method for determining the state of the wireless temperature sensor here, for example,
Information on reflected power, antenna gain, required received power, matching loss, polarization, and thermal deformation of the antenna of the wireless temperature sensor 200 at each temperature below and above the transformation point of the wireless temperature sensor 200 Reversible information about,
Effective radiated power of radio waves radiated from the antenna 131 of the wireless temperature sensor management device 100;
From the distance between the antenna 131 and the wireless temperature sensor 200,
A method for determining the temperature state of the wireless temperature sensor 200 is assumed, and details thereof will be described later.
The wireless temperature sensor device 100 includes an output unit 113 that outputs the calculated wireless temperature sensor state determination result to the output interface 106.

Next, the wireless temperature sensor 200 that communicates with the wireless temperature sensor management apparatus 100 will be described. In the present embodiment, as an example, an example of a passive wireless temperature sensor that does not incorporate a battery, instead of an active type that incorporates a battery, will be described below.
The wireless temperature sensor 200 includes a CPU 210, a RAM 211, a ROM 212, information on effective gain and polarization at temperatures below the transformation point, and information on effective gain and polarization at temperatures above the transformation point of the wireless temperature sensor. , An IC chip 201 composed of an EEPROM 213 for storing reversible information relating to thermal deformation of the antenna of the wireless temperature sensor, a case 202 for housing the IC chip 201, an antenna 203 disposed in the case 202, and a wireless communication interface 204.

  A radio wave transmitted from the antenna 131 of the wireless temperature sensor management apparatus 100 is received by the antenna 203, and a power / clock signal and data are received from the received radio wave. In addition, since it is a passive type, the circuit is activated by the electric power obtained in this way, and the ID of the wireless temperature sensor stored in the EEPROM 213, the transformation point and below, and the reflected power and the antenna directivity at each temperature above. Information on gain, required received power, matching loss, polarization, reversibility information on thermal deformation of the antenna of the wireless temperature sensor 200, and other data such as the product number of the article to which the wireless temperature sensor is attached It returns to the said wireless temperature sensor management apparatus as an electromagnetic wave.

  When the wireless temperature sensor 200 communicates with the wireless temperature sensor management device 100, the wireless temperature sensor 200 is stored in the EEPROM 213, which is the storage device, the transformation point related to the wireless temperature sensor above and below the antenna directivity gain, etc. A sensor information transmission unit 205 that reads communication characteristic data and reversibility information regarding thermal deformation of the antenna and transmits the reversibility information to the wireless temperature sensor management device 200 is provided. The sensor information transmission unit 205 can be assumed to be stored as a program in either the ROM 212 or the EEPROM 213, for example. Therefore, the CPU 210 of the wireless temperature sensor 200 reads the sensor information transmission unit 205 as a program from either the ROM 212 or the EEPROM 213 and executes it.

In addition, each function part 110, 111, 112, 113 in the wireless temperature sensor management apparatus 100 shown so far may be realized as hardware, or in an appropriate storage device such as a memory or an HDD (Hard Disk Drive). It may be realized as a stored program. In this case, the CPU 104 reads the corresponding program from the storage device 101 to the memory 103 and executes it in accordance with the program execution.
In addition, the sensor information transmission unit 205 in the wireless temperature sensor 200 may be realized as hardware or may be realized as a program stored in an appropriate storage device such as a ROM. In this case, the CPU 210 reads the corresponding program from the ROM 212 to the RAM 211 in accordance with the execution of the program, and executes it.

  Next, the structure of the table including the communication characteristic data such as the directivity gain of the antenna and the reversibility information regarding the thermal deformation of the antenna in the wireless temperature sensor 200 according to the present embodiment above and below the transformation point stored in the memory. Will be described.

  FIG. 9 is a diagram illustrating a data structure example of the temperature characteristic table 220 of the wireless temperature sensor in the present embodiment. The temperature characteristic table 220 includes information about the reflected power, the antenna directivity gain, the required received power, the matching loss, the polarization, and the radio temperature at each temperature below and above the transformation point of the radio temperature sensor 200. It is the table which stored the reversibility information regarding the thermal deformation of the antenna 203 of the sensor 200, the temperature characteristic data, and the required received power of the wireless temperature sensor. As an example of the value of reversibility information regarding the thermal deformation of the antenna, it has a value of 0 to 3, where 0 is reversible regarding thermal deformation, 1 is irreversible when changing from low temperature to high temperature, and 2 is from high temperature to low temperature. It is assumed that 3 is irreversible when changing from low temperature to high temperature or from high temperature to low temperature.

  The temperature characteristic table 220 of this wireless temperature sensor is, for example, a thermal deformation indicating whether or not the temperature returns to the original shape when the temperature changes below the transformation point when the temperature changes to the temperature above the transformation point and the antenna shape changes. In addition to the reversibility information regarding the wireless temperature sensor and the required reception power of the wireless temperature sensor, which is the minimum power required for the operation of the wireless temperature sensor, the antenna directivity gain and the wireless temperature at the temperatures below and above the transformation point respectively. It consists of a data field in which data such as matching loss at the junction between the sensor IC chip and the antenna portion, reflected power, and information on polarization such as linear polarization and circular polarization are associated.

  Next, an actual procedure of the wireless temperature sensor management method in the present embodiment will be described with reference to the drawings.

  Of the various operations corresponding to the electronic tag management method described below, the operation related to the wireless temperature sensor management device 100 is realized by the program 102 that the wireless temperature sensor management device 100 reads into the memory 103 and executes, The wireless temperature sensor 200 is realized by a program that the wireless temperature sensor 200 reads from the EEPROM 213 to the RAM 211 and executes. These programs are composed of codes for performing various operations described below.

  FIG. 10 is a diagram illustrating a processing procedure example of the wireless temperature sensor management method of the present embodiment. In this flow example, a process for determining the temperature state of the wireless temperature sensor from the communication condition when communicating with the wireless temperature sensor and the communication result with the wireless temperature sensor will be described.

  It is assumed that the antenna of the wireless temperature sensor management device and the wireless temperature sensor are installed at specific positions and the distance is fixed. In addition, the wireless temperature sensor has an ID in advance, the temperature of the transformation point shown in FIG. 9, the antenna shape reversibility due to thermal change, the necessary received power, the reflected power, and the transformation point or less, and at each temperature above, It is assumed that information on antenna directivity gain, matching loss, and polarization is stored in advance.

  Under the above premise, first, the communication condition setting unit 110 of the wireless temperature sensor management device 100 sets the antenna 131 to both horizontal polarization and vertical polarization at a transmission level of high output (for example, antenna power 36 dBm). To start communication with the wireless temperature sensor at each polarization (F001).

  When communication with the wireless temperature sensor is not possible for both horizontal polarization and vertical polarization antenna settings, the sensor state determination unit 112 determines that the wireless temperature sensor 200 may be damaged, A warning notification is sent from the output interface 106 (F003).

  On the other hand, if communication with the wireless temperature sensor is possible, the sensor information acquisition unit 111 acquires data such as the ID and the temperature of the transformation point stored in the memory of the wireless temperature sensor, and stores the data in the memory 103 (F004).

  Next, the communication condition setting unit 110, based on the acquired information of the wireless temperature sensor, sets either a condition where communication is not possible on the low temperature side below the transformation point or a condition where communication is not possible on the high temperature side above the transformation point. Select and communicate with the wireless temperature sensor again (F005, F006, F012). First, the communication condition setting unit 110 performs evaluation for selecting a condition where communication is not possible (F005). The communication condition is selected such that communication is not possible on the low temperature side but communication is possible on the high temperature side, or communication is not possible on the high temperature side but communication is possible on the low temperature side. When the above condition is established on either the low temperature side or the high temperature side, either the low temperature side or the high temperature side may be selected.

  Specifically, in this embodiment, as shown by the table 220 in FIG. 9, the directivity gain of the antenna 203 on the low temperature side is lower than that on the high temperature side, and the loss due to matching loss is large. Therefore, by setting the effective radiated power of the wireless temperature sensor management device to a low output, it is possible to set communication conditions that allow communication on the high temperature side but not on the low temperature side. Therefore, in this embodiment, the communication condition is selected such that communication is not possible on the low temperature side below the transformation point.

Hereinafter, a case where communication conditions are set such that communication cannot be performed on the low temperature side will be described.
The communication condition setting unit 110 sets a communication condition that cannot communicate at a temperature below the transformation point (F006). That is, information indicating this communication condition is stored in the memory 103. In the present embodiment, the polarization of the antenna 131 is set to the horizontal polarization based on the data of the wireless temperature sensor in the table 220 of FIG. 9, and the effective radiated power output from the wireless temperature sensor management device is communicated on the high temperature side. Power that cannot be communicated on the low temperature side. Information indicating these is stored in the memory 103.

  A specific set value of the effective radiated power is calculated from the mathematical formula of FIG. For example, when the communication distance between the antenna 131 of the wireless temperature sensor management device and the wireless temperature sensor 200 is 1 m and the frequency used is 950 MHz, communication is possible if the effective radiated power is 22 dBm or higher on the high temperature side, while 34 dBm or higher on the low temperature side. Therefore, the communication condition setting unit 110 sets the effective radiated power to a value between 22 dBm and less than 34 dBm, for example, 25 dBm. Communication with the wireless temperature sensor is performed under this communication condition (F007).

  If communication with the process F007 fails to communicate with the wireless temperature sensor, the sensor state determination unit 112 determines whether the temperature of the sensor wireless temperature sensor 200 is equal to or lower than the current transformation point because communication failed under conditions where communication is not possible in the low temperature region. Alternatively, it is determined that the temperature is equal to or lower than the past transformation point. Furthermore, the sensor state determination unit 112 confirms the reversibility information regarding the thermal deformation of the antenna 203 of the wireless temperature sensor 200 stored in the memory 103. If the deformation of the antenna shape at a low temperature is reversible, the sensor state determination unit 112 checks from the low temperature to the high temperature. Since the antenna shape returns to its original state due to the temperature change, it is determined that the temperature is lower than the transformation point (F010). On the other hand, when the reversibility information regarding the thermal deformation of the antenna 203 is irreversible due to deformation at low temperature, the shape of the antenna 203 does not recover once the temperature becomes lower than the transformation point. (F011).

  On the other hand, if the communication with the wireless temperature sensor can be performed in the communication of the process F007, since the communication has succeeded under the condition that communication is not possible in the low temperature region, the sensor state determination unit 112 determines whether the temperature of the sensor wireless temperature sensor 200 is equal to or higher than the current transformation point. Or, it is determined that the temperature is higher than the past transformation point. The sensor state discriminating unit 112 confirms the reversibility information regarding the thermal deformation of the antenna 203 of the wireless temperature sensor 200 stored in the memory 103, and if the deformation of the antenna shape at a high temperature above the transformation point is reversible, the transformation is performed. Since the antenna shape returns to the original shape when the temperature changes from a high temperature above the point to a low temperature below the transformation point, it is determined that the temperature is above the transformation point (F015). On the other hand, if the reversibility information regarding the thermal deformation of the antenna 203 is irreversible due to deformation at high temperature, the shape of the antenna 203 does not recover once the temperature becomes higher than the transformation point. (F011).

  As described above, the case where the communication condition is set so that communication cannot be performed on the low temperature side has been described. However, the same processing is performed when the communication condition is set so that communication cannot be performed on the high temperature side.

  First, the communication condition setting unit 110 sets a communication condition that cannot communicate at a temperature equal to or higher than the transformation point (F012). That is, information indicating communication conditions is stored in the memory 103.

  When communication with the process F012 fails to communicate with the wireless temperature sensor, the sensor state determination unit 112 determines whether the temperature of the sensor wireless temperature sensor 200 is equal to or higher than the current transformation point because communication failed under conditions where communication is not possible in the high temperature region. Alternatively, it is determined that the temperature is equal to or higher than the past transformation point. Further, the sensor state determination unit 112 confirms the reversibility information regarding the thermal deformation of the antenna 203 of the wireless temperature sensor 200 stored in the memory 103. If the deformation of the antenna shape at high temperature is reversible, the sensor state determination unit 112 is higher than the transformation point. Since the antenna shape returns to its original shape when the temperature changes from a high temperature to a low temperature below the transformation point, it is determined that the temperature is higher than the transformation point (F015). On the other hand, if the reversibility information regarding the thermal deformation of the antenna 203 is irreversible due to deformation at high temperature, the shape of the antenna 203 does not recover once the temperature becomes higher than the transformation point. (F016).

On the other hand, when the communication with the wireless temperature sensor can be performed in the communication of the process F012, since the communication has been successfully performed under the condition where the communication cannot be performed in the high temperature region, the sensor state determination unit 112 determines whether the sensor wireless temperature sensor 200 has a temperature equal to or lower than the current transformation point. Or, it is determined that the temperature is lower than the past transformation point. The sensor state determination unit 112 confirms the reversibility information regarding the thermal deformation of the antenna 203 of the wireless temperature sensor 200 stored in the memory 103. If the deformation of the antenna shape at low temperature is reversible, the temperature from the low temperature to the high temperature Since the antenna shape returns to its original state due to the change, it is determined that the temperature is lower than the transformation point (F018). On the other hand, if the reversibility information regarding the thermal deformation of the antenna 203 is irreversible due to deformation at a low temperature below the transformation point, the shape of the antenna 203 does not recover once the temperature falls below the transformation point, so the wireless temperature sensor has transformed in the past. It is determined that the temperature has become lower than the point (F019).
With the above method, the temperature state of the wireless temperature sensor 200 can be determined.

  In the present embodiment, the wireless temperature sensor management device determines the temperature state of the wireless temperature sensor by changing the effective power, but instead of changing the effective power, the antenna position of the wireless temperature sensor management device is determined. It may be changed. Further, the polarization of the antenna of the wireless temperature sensor management device may be changed.

  In this embodiment, the effective gain and polarization information at a temperature below the transformation point of the wireless temperature sensor, the effective gain and polarization information at a temperature above the transformation point of the wireless temperature sensor, and the wireless The reversible information about the thermal deformation of the antenna of the temperature sensor is stored in the EEPROM of the wireless temperature sensor, and the wireless temperature sensor management device reads this information to determine the temperature state of the wireless temperature sensor. Instead of storing the information, the wireless temperature sensor management device or the database connected to the wireless temperature sensor management device stores the information of the wireless temperature sensor, and the ID of the wireless temperature sensor and the wireless temperature sensor Information such as effective gain and polarization at temperatures above and below the transformation point is linked, and the wireless temperature sensor ID is read by communicating with the wireless temperature sensor. And ID, a wireless temperature sensor managing device, or by comparing the information of the wireless temperature sensor that is stored in the connected database to the wireless temperature sensor managing device may determine the temperature state of the wireless temperature sensor.

  In addition, the wireless temperature sensor management device in the present embodiment is a device in which the wireless temperature sensor management function and the wireless communication function are integrated, but the wireless temperature sensor management device and the wireless communication device are separated into two devices, Both may be connected and controlled via a network.

  As mentioned above, although embodiment regarding the wireless temperature sensor management apparatus of this invention was described concretely based on the embodiment, it is not limited to this and can be variously changed in the range which does not deviate from the summary. .

  Finally, an embodiment relating to an article temperature management system using the wireless temperature sensor management apparatus of the present invention will be described with reference to the drawings.

FIG. 12 is a configuration diagram of an article temperature management system using the wireless temperature sensor management apparatus of the present invention. FIG. 13 is a configuration diagram of the article temperature management system control server.
In the past, the article temperature management system according to the present embodiment is such that when the article is stored, the article is over the storage temperature due to wireless communication between the wireless temperature sensor attached to the article and the wireless temperature sensor management device. After confirming whether or not there is, the temperature of the article on the article management shelf is managed. In this embodiment, the storage temperature of the article is only the upper limit value, and only the upper limit of the temperature is managed.
The received articles 312 flow on the belt conveyor 316 with a sorting function, and are sorted by articles that have not exceeded the storage temperature in the past and articles that have exceeded the storage temperature in the past. Articles that have not exceeded the storage temperature in the past after sorting are managed by the article management shelf 317. On the other hand, articles that have exceeded the storage temperature in the past are sent to the abnormal article management box 318.

  A wireless temperature sensor 313 that is the first embodiment of the wireless temperature sensor of the present invention is attached to each article. The transformation point of the wireless temperature sensor 313 attached to the article is processed so as to have a storage temperature unique to each article. The wireless temperature sensor 313 is irreversible with respect to thermal deformation, and is processed so that it can communicate only in the vicinity or in a strong electric field once the temperature at the transformation point is exceeded.

  The belt conveyor 316 with a sort function has a sort function that sorts the received articles into an article management shelf 317 and an abnormal article management box 318. A wireless temperature sensor management device 314 is installed at the entrance of the belt conveyor 316 with a sort function, and when an article is received, it communicates with the wireless temperature sensor 313 of the received article, and the temperature state of the wireless temperature sensor 313 is indicated. Determine. The article temperature management system control server 310 receives the data in the memory such as the ID of the wireless temperature sensor 313 and the determination result of the temperature state from the wireless temperature sensor management device 314, and the belt conveyor with sort function based on the determination result And the destination of the article 312 is distributed to the article management shelf 317 and the abnormal article management box 318.

  The article 312 sent to the article management shelf 317 is temperature-managed by the article temperature management system control server 310. The article temperature management system control server 310 adjusts the temperature of the article temperature management shelf 317 by controlling the air conditioner 311. The article temperature management system control server 310 uses the temperature at the transformation point of the wireless temperature sensor 313 received from the wireless temperature sensor management apparatus 314 when sorting the destinations of the articles 312, that is, the storage temperature of the article, as the air conditioner of the article temperature management shelf 317. When the temperature is lower than the set temperature of 311, the set temperature of the air conditioner 311 is lowered to a temperature equal to or lower than the transformation point of the wireless temperature sensor 313. Further, the wireless temperature sensor 319 always communicates wirelessly with the wireless temperature sensor 313 of the article 312 on the article management shelf 317 and sends information to the article temperature management system control server 310. When the article temperature management system control server 310 detects a temperature equal to or higher than the transformation point, the article temperature management system control server 310 displays a warning on its own display and controls the air conditioner 311 to lower the ambient temperature of the article management shelf 317. Either one of the display and the control of the air conditioner may be performed.

  The wireless temperature sensor management devices (314, 319), the air conditioner 311 and the belt conveyor 316 with a sort function are each provided with a communication interface, via the article temperature management system control server 310 and the HUB 321 which is a concentrator. Connected by signal lines. In addition, an antenna 315 is connected to the wireless temperature sensor management device 314, and an antenna 320 is connected to the wireless temperature sensor management device 319. The article temperature management system control server 310 and the HUB 321 are signal lines 322, the wireless temperature sensor management device 314 and the HUB 321 are signal lines 325, the wireless temperature sensor management device 319 and the HUB 321 are signal lines 326, and the air conditioner 311 and the HUB 321 are connected. Is a signal line 323, and the sort function belt conveyor 316 and the HUB 321 are connected by a signal line 324.

  Hereinafter, the function which implement | achieves the article | item temperature management system of the article | item temperature management system control server 310 in this embodiment is demonstrated.

  The article temperature management system control server 310 in the present embodiment has the functions for realizing the article temperature management system of the present invention, the wireless temperature sensor management device (314, 319), the wireless temperature sensor 313, and the article management shelf of the present invention. The program 402 stored in the storage device 401 such as a non-volatile memory is read into the memory 403 to be realized for the air conditioner 311 that adjusts the ambient temperature 317 and the belt conveyor 316 with a sort function, and the CPU 404 that is an arithmetic device. To execute.

  The article temperature management system control server 310 includes an input interface 405 such as a keyboard generally provided in a computer device, an output interface 406 such as a display, a wireless temperature sensor management device (314, 319), and an air conditioner 311. And a communication interface 408 responsible for communication with the belt conveyor 316 with a sorting function.

Subsequently, the functional unit of the article temperature management system control server 310 will be described.
The article temperature management system control server 310 receives a communication result between the wireless temperature sensor management apparatus 315 and the wireless temperature sensor 313 when the article is received from the wireless temperature sensor management apparatus 315, and the memory 403 and the article management table 407. Warehousing processing section 410 to store in
When the temperature state of the wireless temperature sensor 313 is a normal temperature equal to or lower than the transformation point and the temperature at the transformation point is lower than the current storage temperature of the article management shelf, the air conditioner 311 is lowered so as to lower the storage temperature of the air conditioner 311. A temperature management unit 412 that controls 311 is provided.

  FIG. 16 is an example of a table structure when the communication result data of the wireless temperature sensor 313 is stored in the article management table 407. The data of the wireless temperature sensor 313 sent to the article management shelf 317 is composed of an ID and a temperature data field of the transformation point, and the data of the wireless temperature sensor 313 sent to the abnormality management box 318 is the presence or absence of a response of the communication result And ID and transformation point temperature data fields. When there is a response from the wireless temperature sensor 313, the ID and transformation point temperature are recorded.

  Further, the article temperature management system control server 310 takes out a communication result with the wireless temperature sensor from the memory 403, and has a sorting function based on the presence / absence of a response of the wireless temperature sensor and the determination result of the temperature state of the wireless temperature sensor. A sorter control unit 411 that controls the distribution of the destinations of articles on the belt conveyor 316 is provided.

  Further, the article temperature management system control server 310 periodically receives a communication result between the wireless temperature sensor management apparatus 319 and the wireless temperature sensor 313 stored in the article management shelf 317 from the wireless temperature sensor management apparatus 319. When the determination result of the temperature state of the unit 412 and the wireless temperature sensor is equal to or higher than the transformation point, an output unit 413 that outputs a warning message to the display of the article temperature management system control server 310 is provided.

  Next, an actual procedure of the management method of the article temperature management system in the present embodiment will be described with reference to the drawings.

FIG. 14 is a diagram illustrating an example of a procedure during the warehousing process of the article temperature management system according to the present embodiment. The warehousing unit 410 of the article temperature management system control server 310 is a memory of the wireless temperature sensor 313 attached to the article 312. The data such as the ID, the temperature at the transformation point, and the determination result of the temperature state are received from the wireless temperature sensor management device 314, and the reception result is recorded in the memory 403 (F101).
The warehousing processing unit 410 reads out the reception result of the data of the wireless temperature sensor 313 from the memory 403, and when the wireless temperature sensor management device does not respond to the wireless sensor, the storage processing unit 410 stores it in the abnormality management box table of the article management table 407. Then, it is registered that there is no response from the wireless temperature sensor (F103).

  Further, the sorter control unit 411 reads the reception result of the data of the wireless temperature sensor 313 from the memory 403, and when the determination result of the wireless temperature sensor management device is abnormal, the sorter control unit 411 distributes and sends the article 312 to the abnormality management box 318 (F104). ).

  The warehousing processing unit 410 reads the data reception result of the wireless temperature sensor 313 from the memory 403, and determines that the wireless temperature sensor and the article are normal when the determination result of the wireless temperature sensor management device is a low temperature below the transformation point. Then, the ID of the wireless temperature sensor and the temperature of the transformation point are registered in the article management shelf table of the article management table 407 (F106).

  Further, the temperature management unit 412 reads out the reception result of the data of the wireless temperature sensor 313 from the memory 403, and when the determination result of the wireless temperature sensor management device is a low temperature below the transformation point, and the temperature of the transformation point is When the temperature is lower than the current storage temperature of the article management shelf, the air conditioner 311 is controlled to lower the storage temperature of the air conditioner 311 (F108).

  Further, the sorter control unit 411 reads out the reception result of the data of the wireless temperature sensor 313 from the memory 403, and distributes the article 312 to the article management shelf 317 when the determination result of the wireless temperature sensor management device is a low temperature below the transformation point. Send it (F109).

  The warehousing processing unit 410 reads the reception result of the data of the wireless temperature sensor 313 from the memory 403, and determines that the wireless temperature sensor and the article are abnormal when the determination result of the wireless temperature sensor management device is a high temperature above the transformation point. Then, the fact that there is a response of the wireless temperature sensor is registered in the abnormality management box table of the article management table 407, and the ID of the wireless temperature sensor and the temperature of the transformation point are registered ((F110)).

  Further, the sorter control unit 411 reads out the reception result of the data of the wireless temperature sensor 313 from the memory 403, and distributes the article 312 to the abnormality management box 318 when the determination result of the wireless temperature sensor management device is higher than the transformation point. Send it (F111).

  Next, the temperature management processing procedure for the article 312 on the article management shelf 17 of the article temperature management system of this embodiment will be described with reference to the drawings. FIG. 15 is a diagram illustrating a procedure example of a temperature management method for the article 313 on the article management shelf 17 in the article temperature management system according to the present embodiment.

  The wireless temperature sensor management device 319 periodically communicates with the wireless temperature sensor 313 attached to the article 313 on the article management shelf 317, and the determination result of the temperature state of the wireless temperature sensor is sent to the article temperature management system control server 310. Send regularly. Note that communication may be performed irregularly.

  The temperature management unit 412 of the article temperature management system control server 310 determines that the received temperature state of the wireless temperature sensor is within the storage temperature of the article 312 when the temperature determination result is lower than the transformation point (F203).

  On the other hand, the temperature management unit 412 of the article temperature management system control server 310 determines that the received temperature state of the wireless temperature sensor is equal to or higher than the storage temperature of the article 312 when the temperature state determination result is higher than the transformation point. The air conditioner 311 is controlled so that the ambient temperature of the shelf 317 is equal to or lower than the storage temperature equal to or lower than the transformation point (F204).

  The output unit 413 determines that the storage temperature of the article management shelf 317 is equal to or higher than the storage temperature of the article 312 when the received determination result of the temperature state of the wireless temperature sensor is higher than the transformation point, and the article temperature management is performed. A warning screen is displayed on the display of the system control server 310 (F205).

  As mentioned above, although embodiment related to the article temperature management system of the form of the present invention was concretely explained based on the embodiment, it is not limited to this, and the wireless temperature sensor management device is a belt conveyor with sorting. Various modifications can be made without departing from the gist of the invention.

  In addition, the radio | wireless temperature sensor demonstrated by each embodiment described above contributes to the weight reduction and size reduction of a radio | wireless temperature sensor because the antenna of the radio | wireless temperature sensor which consists of shape memory alloys bears a temperature sensor function.

  In addition, since the antenna portion serves as a temperature sensor, it contributes to mounting the temperature sensor function at a low cost on an electronic tag including a radio wave type antenna.

  Furthermore, each embodiment is a small and lightweight wireless temperature sensor, a wireless temperature sensor management device, and a temperature management system applied to temperature management of articles in traceability and temperature management of members in manufacturing processes in industry. I will provide a.

FIG. 3 is an overview perspective view of the wireless temperature sensor at a temperature equal to or higher than the transformation point in the first embodiment of the wireless temperature sensor. FIG. 3 is an overview perspective view of the wireless temperature sensor at a temperature equal to or lower than the transformation point in the first embodiment of the wireless temperature sensor. The general | schematic perspective view of the wireless temperature sensor in the temperature more than the transformation point in 2nd Embodiment of this wireless temperature sensor. The general | schematic perspective view of the wireless temperature sensor in the temperature below the transformation point in 2nd Embodiment of this wireless temperature sensor. The general | schematic top view of the wireless temperature sensor in the low temperature area | region in 3rd Embodiment of this wireless temperature sensor. FIG. 10 is a schematic top view of a wireless temperature sensor in an intermediate temperature region in a third embodiment of the wireless temperature sensor. The general | schematic top view of the wireless temperature sensor in the high temperature area | region in 3rd Embodiment of this wireless temperature sensor. The block diagram of the wireless temperature sensor management apparatus in this embodiment. The temperature characteristic table of the wireless temperature sensor in this embodiment. The figure which shows the example of a process sequence which discriminate | determines the temperature state of the wireless temperature sensor of the wireless temperature sensor management apparatus in this embodiment. The figure which shows the effective radiated power calculation formula of the wireless temperature sensor management apparatus of this embodiment. The article temperature management system block diagram using the wireless temperature sensor management device of the present invention. The block diagram of the goods temperature management system control server of this invention. The figure which shows the sort processing procedure of the goods delivery destination of the goods temperature management system using the wireless temperature sensor management apparatus of this invention. The figure which shows the temperature management procedure in the article | item management shelf of the article | item temperature management system using the wireless temperature sensor management apparatus of this invention. The table structure figure of the article management table in the article temperature management system control server of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 6, 21 ... IC chip 2, 22 ... Antenna member 3, 23 ... Antenna member 4, 11, 24 ... Wireless temperature sensor case 9, 10, 25 ... Spring 7, 8 ... Shape memory alloy which consists of shape memory alloys Antenna member 100, 314, 319 ... Wireless temperature sensor management device 101 ... Storage device 102 (of wireless temperature sensor management device) ... Program 103 (of wireless temperature sensor management device) ... Memory 104 (of wireless temperature sensor management device) ... CPU (of wireless temperature sensor management device)
105 ... Input interface 106 (of wireless temperature sensor management device) ... Output interface 110 (of wireless temperature sensor management device) ... Communication condition setting unit 111 (of wireless temperature sensor management device) ... Sensor information (of wireless temperature sensor management device) Acquisition unit 112 ... sensor state determination unit 113 (of the wireless temperature sensor management device) ... output unit 130 (of the wireless temperature sensor management device) ... wireless communication interfaces 131, 315, 320 ... (of the wireless temperature sensor management device) Antenna 200 (of sensor management device), 313 ... Wireless temperature sensor 201 ... (Wireless temperature sensor) IC chip 202 ... (Wireless temperature sensor) Case 203 ... (Wireless temperature sensor) Antenna 204 ... (Wireless temperature sensor) Wireless Communication interface 205 (information on wireless temperature sensor) Information transmission unit 210 (of wireless temperature sensor) Line of temperature sensor) CPU
211 ... RAM (of wireless temperature sensor)
212 ... ROM (of wireless temperature sensor)
213 ... EEPROM (of wireless temperature sensor)
220 ... Temperature characteristic table 310 (of wireless temperature sensor) ... Article temperature management system control server 311 ... Air conditioner 312 ... Article 316 ... Belt conveyor with sort function
317 ... Article management shelf 318 ... Abnormality management box 321 ... HUB
322, 323, 324, 325, 326 ... signal line 401 ... storage device 402 (of article temperature management system control server) ... program 403 (of article temperature management system control server) ... memory 404 (of article temperature management system control server) ... CPU (of article temperature management system control server)
405 ... Input interface 406 (of article temperature management system control server) Output interface 407 (of article temperature management system control server) Article management table 408 (of article temperature management system control server) ... (of article temperature management system control server) ) Communication interface 410 ... Warehousing processor 411 (of the article temperature management system control server) ... Sorter controller 412 (of the article temperature management system control server) ... Temperature management section 413 (of the article temperature management system control server) ... (article temperature) Output part of management system control server

Claims (11)

At least in a temperature sensor that detects temperature changes,
A member whose shape changes according to a temperature change;
Means for detecting radio wave characteristics of the member that change with the shape change of the member;
A temperature sensor comprising: means for detecting the temperature change according to the detected radio wave characteristic. The temperature sensor according to claim 1,
The temperature sensor characterized in that the member is made of a shape memory alloy. The temperature sensor according to claim 1,
The member has a first partial member and a second partial member that change in shape according to a temperature change, and the second partial member changes in shape as the shape of the first partial member changes. And a temperature sensor connected to the first partial member. The temperature sensor according to claim 3,
The temperature sensor, wherein the first partial member is made of a spring shape and / or a shape memory alloy. The temperature sensor according to any one of claims 1 to 4,
The member is an antenna that outputs radio waves from the temperature sensor,
The temperature sensor characterized in that the means for detecting the radio wave characteristic detects at least one of an effective gain and a polarization of the antenna. The temperature sensor according to claim 5,
The antenna is a cross dipole antenna, the antenna element of the horizontal polarization component and the antenna element of the vertical polarization component in the cross dipole antenna are made of a shape memory alloy having different crystal configurations,
The means for detecting the radio wave characteristic has a shape of an antenna for at least three temperature regions in accordance with different temperatures of transformation points of the antenna elements of the horizontally polarized wave component and the vertically polarized wave component. A temperature sensor characterized by detecting the characteristics of polarization changing in each temperature region by changing each. In the temperature sensor in any one of Claim 5 or 6,
And further has means for storing information,
The storing means stores information on effective gain and / or polarization at a temperature below the transformation point of the antenna, information on effective gain and / or polarization at a temperature above the transformation point, and reversibility information on thermal deformation. A temperature sensor characterized by storing. The temperature sensor according to any one of claims 5 to 7,
The temperature sensor further comprises control means for transmitting the detected temperature change via the antenna. The temperature sensor according to any one of claims 1 to 8,
The temperature sensor is characterized in that the means for detecting the temperature change measures the temperature. A communication device that performs wireless communication with the temperature sensor according to any one of claims 1 to 9,
In wireless communication with the temperature sensor, a process for determining the state of the wireless temperature sensor from communication conditions regarding effective radiated power and polarization controlled by the communication device and a communication result when wirelessly communicating with the wireless temperature sensor; A temperature sensor management device comprising: an output device that outputs the determination result to an output interface. A communication device that communicates with the temperature sensor according to any one of claims 1 to 9, and an arithmetic device that determines a state of the wireless temperature sensor based on a communication condition with the temperature sensor and a communication result with the wireless temperature sensor. In a program for causing a computer comprising:
Causing the communication device to communicate with the temperature sensor;
The arithmetic unit is configured to determine the state of the temperature sensor based on the communication result and a predetermined communication condition with the temperature sensor,
The arithmetic unit causes the output interface to output the state of the temperature sensor.

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