WO2000022390A1 - Capteur d'infrarouge et thermometre de mesure du rayonnement - Google Patents

Capteur d'infrarouge et thermometre de mesure du rayonnement Download PDF

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Publication number
WO2000022390A1
WO2000022390A1 PCT/JP1998/004653 JP9804653W WO0022390A1 WO 2000022390 A1 WO2000022390 A1 WO 2000022390A1 JP 9804653 W JP9804653 W JP 9804653W WO 0022390 A1 WO0022390 A1 WO 0022390A1
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WO
WIPO (PCT)
Prior art keywords
sensor
infrared
heating
thermopile
temperature
Prior art date
Application number
PCT/JP1998/004653
Other languages
English (en)
Japanese (ja)
Inventor
Kazuhito Sakano
Original Assignee
Kazuhito Sakano
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kazuhito Sakano filed Critical Kazuhito Sakano
Priority to AU94616/98A priority Critical patent/AU9461698A/en
Priority to PCT/JP1998/004653 priority patent/WO2000022390A1/fr
Priority to PCT/JP1999/002410 priority patent/WO2000022391A1/fr
Priority to JP55280699A priority patent/JP3346583B2/ja
Priority to AU36298/99A priority patent/AU3629899A/en
Publication of WO2000022390A1 publication Critical patent/WO2000022390A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/06—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity
    • G01J5/061—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity by controlling the temperature of the apparatus or parts thereof, e.g. using cooling means or thermostats
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/04—Casings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/04—Casings
    • G01J5/049—Casings for tympanic thermometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G01J5/0818—Waveguides
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G01J5/084—Adjustable or slidable

Definitions

  • the present invention relates to an infrared sensor and a radiation thermometer having the infrared sensor. More specifically, the present invention relates to an infrared sensor that detects infrared rays emitted from a measurement target and a radiation thermometer that detects infrared rays with the infrared sensor and measures the temperature of the measurement target in a non-contact manner.
  • thermometers emit more radiation from the eardrum and surrounding tissues than contact-type thermometers such as a sublingual thermometer that measures the temperature in the oral cavity and an axillary thermometer that measures the temperature of the axilla for reasons of hygiene and convenience.
  • contact-type thermometers such as a sublingual thermometer that measures the temperature in the oral cavity and an axillary thermometer that measures the temperature of the axilla for reasons of hygiene and convenience.
  • thermometers Because the eardrum is located deep within the human body and is less susceptible to the external environment, one of the reasons why ear-type thermometers have attracted attention is that they can measure body temperature more accurately than other parts of the human body such as the oral cavity and axilla. It is.
  • Ear thermometers generally use a pyroelectric sensor or a thermopile sensor as an infrared sensor for detecting infrared radiation emitted from a measurement object.
  • Pyroelectric sensors use a temperature change when they absorb infrared energy radiated from the object to be measured. The sensor detects a change in the surface charge of the pyroelectric body as an output. Since the pyroelectric sensor outputs an output only when the temperature of the pyroelectric element changes, the incident infrared ray is shoved to intermittently cut off and output continuously.
  • a thermopile sensor is a sensor in which thermocouples are deposited using integrated circuit technology, and a continuous output for the temperature difference between the hot junction and the cold junction is obtained by a large number of directly connected thermocouples.
  • thermopile sensor and an ear thermometer using the thermopile sensor.
  • thermopile sensors include, for example, thermopile sensors shown in FIGS. 8 and 9. As shown in FIG. 8, such a thermopile sensor is electrically connected to a thermopile element 1 for receiving infrared rays, a heat sink 2 formed on the surface of the thermopile element 1 by vapor deposition or the like, and a thermocouple of the thermopile element 1. And a package 7 having an infrared receiving window 6.
  • the package 7 has a hollow cylindrical shape as shown in FIG. 9, and has a stem 5 attached to one end and an infrared receiving window 6 attached to the other end.
  • the thermopile element 1 has a circular shape. Although not shown, a hot junction for receiving infrared rays is provided at the center of the thermopile element 1, and a cold junction is provided around the center.
  • thermopile sensor converts infrared radiation energy into heat energy when infrared light from the measurement object that enters from the infrared light receiving window 6 provided in the package 7 enters the hot junction of the thermopile element 1. It outputs thermoelectromotive force generated according to the temperature difference between the hot junction and the cold junction.
  • thermometer As a conventional ear thermometer using a thermopile sensor as described above, there is an ear thermometer shown in FIG. As shown in Fig. 10, such an ear thermometer includes a main body case 11, a probe 12 positioned at the tip of the main body case 11, an infrared detector 1 housed in the main body case 11 and the probe 12, and so on. 3 and a temperature measurement circuit section 14.
  • the probe 12 is formed so as to become thinner toward the tip so as not to be inserted deeply into the ear canal, so that the user can use it safely.
  • the infrared detector 13 is composed of a thermopile sensor 15 for detecting infrared rays radiated from the eardrum and a thermopile sensor. And a waveguide 16 connected to the sensor 15 for efficiently transmitting weak infrared rays radiated from the eardrum.
  • the waveguide 16 and the thermopile sensor 15 are fixed to the main body case 11 by support plates 17 and 18, respectively.
  • the temperature measurement circuit section 14 includes a printed circuit board 16 in which a temperature measurement circuit is incorporated, a start switch (not shown), and a liquid crystal temperature display. The thermopile sensor 15 and the printed circuit board 16 are electrically connected.
  • thermopile sensor 15 the infrared radiation radiated from the eardrum and taken in from the waveguide 16 is converted into thermal energy by the thermopile sensor 15, and the hot junction and the cold junction of the thermopile sensor 15 are converted. Temperature based on the thermoelectromotive force generated in accordance with the temperature difference between the thermopile sensor and the temperature data of the thermopile sensor 15 detected by a temperature measuring element such as a thermostat attached to the thermopile sensor 15. The measurement circuit performs arithmetic processing, and the temperature of the eardrum is displayed on a liquid crystal display.
  • FIG. 11 is a block diagram showing a temperature measuring circuit of a radiation thermometer of PCT / JP98 / 0245.
  • thermopile sensor 21 provided in the radiation thermometer outputs a voltage depending on the amount of infrared rays radiated from the eardrum and the temperature of the thermopile sensor 21. That is, the thermopile sensor 21 outputs a voltage corresponding to the difference between the temperature of the object to be measured and the temperature of the thermopile sensor 21, and this output is output when the temperature of the object to be measured is higher than the temperature of the thermopile sensor 21. It is output as a positive voltage, and is output as a negative voltage when the temperature of the measurement target is lower than the temperature of the thermopile sensor 21. When the temperature of the thermopile sensor 21 is equal to the temperature of the thermopile sensor 21, the output of the thermopile sensor 21 is 0.
  • the operational amplifier 22 connected to the thermopile sensor 21 amplifies the minute voltage output from the thermopile sensor 21 to a predetermined magnitude.
  • a comparator (voltage comparator) IC 23 connected to the operational amplifier 22 detects the presence or absence of the output of the thermopile sensor 21 amplified by the operational amplifier 22. That is, the comparator IC 23 is connected to the thermopile sensor irrespective of the magnitude of the output of the thermopile sensor 21 and its sign. A signal is sent to the microcomputer 27 as to whether the output of the sensor 21 is 0 or not.
  • Mono- Mopairusensa 2 1 profile is a good metal can package 2 5 structure in thermal conductivity, mono- miss evening 2 4 This metal can package 2 5 any installed c
  • Reference numeral 4 denotes a temperature measuring element for measuring the temperature of the thermopile sensor 21 via the metal can package 25, and converts a change in the resistance value in the thermistor 24 due to a change in the temperature of the thermistor 24 into a voltage. And output.
  • the operational amplifier 26 connected to the thermistor 24 amplifies the output of the thermistor 24.
  • the microcomputer 27 has a built-in AD converter, and the microcomputer 27 performs arithmetic processing based on the output signal from the IC 23 and the output signal from the monitor 24 to perform liquid crystal temperature processing. Send the temperature value output of the measurement target to display 28.
  • the liquid crystal temperature display 28 digitally displays the temperature of the object to be measured.
  • the heater 29 is wound around a metal can package 25 to heat the thermopile sensor 21.
  • the drive IC 30 transmits a heating command signal from the microcomputer 27 to the microcomputer 29.
  • the following describes how the temperature of the measurement target is measured by the temperature measurement circuit described above.
  • thermopile sensor 21 In the radiation thermometer of PCT / JP980 / 0205, before the temperature measurement is started, the temperature of the thermopile sensor 21 is set to a preset temperature, for example, about 32 ° C. A heating command signal is sent on evening 29. Therefore, at the start of the temperature measurement, the temperature of the thermopile sensor 21 has risen to the set temperature.
  • thermopile sensor 21 When a command to start temperature measurement is transmitted from the outside to the microcomputer 27, a heating command signal for heating the thermopile sensor 21 with the heating amount per unit time being substantially constant is sent from the microcomputer 27 to the drive IC 30. Is sent to the heater 29 via. During the temperature measurement, the thermopile sensor 21 is heated by open loop control, that is, without changing the heating amount of the heater 29.
  • thermopile sensor 21 When the temperature measurement is started, the thermopile sensor 21 is rapidly heated, and the output of the thermopile sensor 21 decreases rapidly. When heating proceeds and the temperature of the thermopile sensor 21 becomes equal to the temperature of the eardrum to be measured, the output of the thermopile sensor 21 becomes 0. The output signal of the thermopile sensor 21 is sent to the comparator IC 23. The temperature of the thermopile sensor 21 at the time when the output of the thermopile sensor 21 becomes 0 is sent to the microcomputer 27 based on the output from the thermistor 24. By performing arithmetic processing, the temperature of the eardrum to be measured is detected. The detected temperature of the eardrum is recognized by being displayed on the liquid crystal temperature indicator 28.
  • the radiation thermometer of PCT / JP 98/0 205 uses the detector with Comparator IC 23 as a detector to detect the output of the thermopile sensor 21. Since the temperature of the thermopile sensor 21 at the time when the output of the thermopile sensor 21 is 0 can be detected by an inexpensive circuit, the temperature at which the temperature of the thermopile sensor 21 is feedback-controlled is reduced. No adjustment is required. Therefore, the radiation thermometer of PCT / JP980 / 0245 can improve the measurement accuracy, shorten the measurement time, and reduce the number of parts. Has advantages.
  • thermopile sensor shown in FIGS. 8 and 9 and the conventional ear thermometer shown in FIG. 10 have the following problems, and the PC TZJ P98 / There was room for improvement in the radiation thermometer of 0 2 0 4 5 as follows.
  • thermopile sensor since the package 7 has a cylindrical shape as described above, for example, when the thermopile sensor is used in a small electronic device, the thermopile sensor is arranged. The arrangement position was sometimes restricted. In particular, when used in an ear thermometer, the probe 12 becomes thinner toward the tip so as not to be inserted deeply into the ear canal as shown in Fig. 10, so depending on the size of the package 7, a thermopile may be used. Sensor 15 could not be provided at the tip of probe 12. Therefore, in the conventional ear thermometer, it is necessary to provide a waveguide 16 for guiding infrared rays to the thermopile sensor 15 as shown in Fig.
  • thermopile sensor 21 is heated by the heater 29 as shown in FIG. Although the temperature of the thermopile sensor 21 has risen to the set temperature, after the temperature measurement is started, the heater 29 is heated to conduct heat to the thermopile sensor 21 via the metal tube package 25 for a certain period of time. Was required. It is an object of the present invention to solve the above-mentioned problems in the prior art and to provide an infrared sensor capable of relaxing the restriction on the arrangement position even when used in a small electronic device.
  • Another object of the present invention is to provide an inexpensive radiation thermometer with improved measurement accuracy and a reduced number of parts.
  • the infrared sensor according to the first invention provided to solve the above-described problems includes an infrared detecting element, a stem through which an electrode connected to the infrared detecting element is inserted, and an infrared detecting element attached to the stem.
  • An infrared sensor comprising: a package having an infrared receiving window for enclosing the element; and an infrared sensor having: a side surface of the package having a tapered portion in which a diameter of the package on the infrared receiving window side is smaller than a diameter of the stem on the stem side. It is.
  • the restriction on the arrangement position can be relaxed.
  • the infrared sensor can be placed close to the eardrum because it conforms to the probe shape.
  • an infrared sensor provided to solve the above-described problems includes an infrared detecting element, a stem having an electrode connected to the infrared detecting element inserted therethrough, A package provided with an infrared receiving window that is mounted on the system and encloses the infrared detecting element; and an infrared sensor having the above, wherein the package has a truncated cone whose diameter on the infrared receiving window side of the package is smaller than the diameter on the stem side.
  • the restriction on the arrangement position can be relaxed.
  • the infrared sensor can be arranged near the eardrum because it conforms to the shape of the probe.
  • thermometer according to a third invention of the present application provided to solve the above-mentioned problem is characterized in that the infrared sensor according to the first invention of the present application is provided at a probe tip for receiving infrared rays. It is a thermometer.
  • thermopile sensor With this configuration, components such as a waveguide and a support plate for supporting the thermopile sensor become unnecessary, and the distance between the thermopile sensor and the eardrum becomes shorter, so that infrared energy increases in proportion to the square of the distance. As a result, a significant increase in the sensitivity of the thermopile sensor results in a large improvement in output, resulting in an inexpensive high-accuracy radiation thermometer with a small number of components while improving measurement accuracy.
  • thermometer according to a fourth invention of the present application provided to solve the above-mentioned problem is characterized in that the infrared sensor according to the second invention of the present application is provided at a probe tip for receiving infrared rays. It is a thermometer.
  • thermopile sensor With this configuration, components such as a waveguide and a support plate for supporting the thermopile sensor become unnecessary, and the distance between the thermopile sensor and the eardrum becomes shorter, so that infrared energy increases in proportion to the square of the distance. As a result, a significant increase in the sensitivity of the thermopile sensor results in a large improvement in output, resulting in an inexpensive high-accuracy radiation thermometer with a small number of components while improving measurement accuracy.
  • a radiation thermometer provided to solve the above-mentioned problem is a sensor having an infrared sensor according to the first invention of the present application, and a hollow portion adapted to a taper portion of the infrared sensor.
  • a radiation thermometer comprising: a heating block; a heating device for heating the sensor heating block; and a slide mechanism for sliding the infrared sensor with respect to the sensor heating block. is there. With this configuration, the infrared sensor can be heated by sliding the infrared sensor on a pre-heated sensor heating block, so that the measurement time can be shortened with the shortened heating time.
  • a radiation thermometer provided to solve the above-mentioned problem is a sensor having a infrared sensor according to the second invention of the present application, and a hollow portion adapted to the truncated cone shape of the infrared sensor.
  • a radiation thermometer comprising: a heating block; a heating device that heats the sensor heating block; and a slide mechanism that slides the infrared sensor with respect to the sensor heating block. is there.
  • the infrared sensor can be heated by sliding the infrared sensor on a pre-heated sensor heating block, so that the measurement time can be shortened with the shortened heating time.
  • a radiation thermometer according to a seventh invention of the present application provided to solve the above-mentioned problems includes an infrared sensor according to the first invention of the present application, a heating device for heating the infrared sensor, and a tapered portion of the infrared sensor.
  • a radiation thermometer comprising: a sensor heat radiation block having a hollow portion conforming to the above; and a slide mechanism for sliding the infrared sensor with respect to the sensor heat radiation block.
  • the pre-heated infrared sensor By adopting such a configuration, it is possible to slide the pre-heated infrared sensor on the sensor radiating block and cool the sensor. For example, the infrared sensor is cooled more than the case where the pre-heated infrared sensor is cooled by natural heat radiation. Cooling (temperature adjustment) in a short time. Therefore, measurement time can be reduced.
  • a radiation thermometer according to an eighth invention of the present application provided to solve the above-mentioned problems includes an infrared sensor according to the second invention of the present application, a heating device for heating the infrared sensor, and a truncated cone of the infrared sensor.
  • a radiation thermometer comprising: a sensor heat radiation block having a hollow portion conforming to a shape; and a slide mechanism for sliding the infrared sensor with respect to the sensor heat radiation block.
  • the pre-heated infrared sensor By adopting such a configuration, it is possible to slide the pre-heated infrared sensor on the sensor radiating block and cool the sensor. For example, the infrared sensor is cooled more than the case where the pre-heated infrared sensor is cooled by natural heat radiation. Cooling (Temperature adjustment) can be performed in a short time. Therefore, measurement time can be reduced.
  • a radiation thermometer according to a ninth invention of the present application provided to solve the above-mentioned problem is a radiation thermometer according to the seventh or eighth invention of the present application, wherein the heating device uses a Peltier element.
  • the radiation thermometer is a thermo module having a heating surface and a cooling surface, wherein the heating surface is connected to the infrared sensor, and the cooling surface is connected to the sensor radiating block.
  • the radiation thermometer according to the fifth to ninth aspects of the present invention has the above-described configuration, and the infrared sensor in the shape of a taper or a truncated cone is housed at the probe tip.
  • the maximum contact area can be obtained by simply sliding the sensor heating block or the sensor heat radiation block having the same taper hollow portion as that of a small distance. Therefore, the maximum heating or heat radiation effect can be obtained with the minimum slide amount.
  • FIG. 1 is a sectional view showing a thermopile sensor according to an embodiment of the present invention.
  • FIG. 2 is a perspective view showing a thermopile sensor according to one embodiment of the present invention.
  • FIG. 3 is a partially cutaway perspective view showing a radiation thermometer according to one embodiment of the present invention.
  • FIG. 4 is a perspective view showing a slide mechanism of the radiation thermometer according to one embodiment of the present invention.
  • FIG. 5 is a block diagram showing a temperature measuring circuit of the radiation thermometer according to one embodiment of the present invention.
  • FIG. 6 is a perspective view showing a slide mechanism of a radiation thermometer according to another embodiment of the present invention.
  • FIG. 7 is a perspective view showing a heating device for a radiation thermometer according to another embodiment of the present invention.
  • FIG. 8 is a sectional view showing a conventional thermopile sensor.
  • FIG. 9 is a perspective view showing a conventional thermopile sensor.
  • FIG. 10 is a sectional view showing a conventional radiation thermometer.
  • FIG. 11 is a block diagram showing a temperature measuring circuit of a conventional radiation thermometer.
  • the infrared sensor according to one embodiment of the present invention is a thermopile sensor, and as shown in FIG. 1, a thermopile element 41 for receiving infrared rays and a thermopile element 41 are formed on the surface by vapor deposition or the like. Heat sink 4 2 and thermopile element 4 1
  • the thermocouple comprises electrode pins 43 and 44 electrically connected to the thermocouple, a stem 45 passing through the electrode pins 43 and 44, and a package 47 having an infrared receiving window 46.
  • the package 47 is formed of a steel plate or the like, and has a hollow truncated cone shape as shown in FIG. 2, and a stem 45 formed of a steel plate or the like is attached to one end of the package 47.
  • the infrared receiving window 46 is attached to the other end. Also, the diameter of the package 47 on the side of the infrared receiving window 46 is smaller than the diameter of the stem 45 on the side.
  • the thermopile element 41 has a circular shape, and although not shown, a hot junction for receiving infrared rays is provided at the center thereof, and a cold junction is provided around the center.
  • thermopile sensor In the thermopile sensor according to the present embodiment, the infrared light from the measurement object incident from the infrared light receiving window 46 provided in the package 47 enters the warm junction of the thermopile element 41, thereby Radiant energy is converted to heat energy, and a thermoelectromotive force is generated that is generated according to the temperature difference between the hot junction and the cold junction.
  • the package 47 has the shape of a truncated cone, so that the restriction on the arrangement position is relaxed even when used in a small electronic device. can do.
  • this thermopile sensor when used in an ear thermometer, it fits the shape of the probe, so this thermopile sensor can be placed near the eardrum. Therefore, components such as a waveguide and a support plate for supporting the thermopile sensor are not required, and the distance between the thermopile sensor and the eardrum is short, so that the infrared energy increases in proportion to the square of the distance.
  • the drastic improvement in the sensitivity of the thermopile sensor leads to a large increase in output, which results in an inexpensive high-accuracy radiation thermometer with a small number of components while improving measurement accuracy.
  • the radiation thermometer according to one embodiment of the present invention is an ear thermometer, and as shown in FIG. 3, a main body case 51, an infrared detecting section 52 housed in the main body case 51, and a temperature measurement circuit. And 53 parts.
  • the infrared detector 52 includes a sensor heating block 54 and a thermopile sensor 55.
  • the temperature measuring circuit 53 includes printed circuit boards 56a and 56b, a switch 57, and a liquid crystal temperature display 5. 8 and a slide mechanism 59.
  • Main body case 51 inserted into the ear canal
  • the probe 60 at the tip must not be inserted deeply into the ear canal. It is formed so that it becomes thinner toward the tip so that the user can use it safely.
  • the infrared detector 5 2 is placed in the main body case 5 1 end of the probe 6 in 0, c infrared detector 5 2 for detecting the infrared radiation incident from provided hole on the tip of the probe 6 0, the radiation from the tympanic membrane It has a frusto-conical thermopile sensor 55 that detects the infrared rays that are emitted, and a hollow part that houses the thermopile sensor 55 inside, and has a hole at the tip end for taking in infrared rays.
  • thermopile sensor 55 having a truncated cone shape.
  • the electrode pins 61 of the thermopile sensor 55 are connected to the printed circuit board 56 a, and the sensor heating probe 54 is fixed to the probe 60.
  • a thermopile sensor 55 and a printed circuit board 56a can be slid on the sensor heating block 54 in the longitudinal direction of the main body case 51 as shown in FIG.
  • the small holes 62 for holding the electrode pins 61 of the thermopile sensor 55 are provided.
  • thermopile sensor 55 and the printed board 56a are advanced toward the front end of the main body case 51 by the slide mechanism 59 described below, the thermopile sensor 55
  • the inner peripheral surface of the sensor heating block 54 is hollowed out into a truncated conical shape so that the inner peripheral surface of the sensor heating block 54 contacts each other.
  • the temperature measurement circuit section 5 3 is a printed circuit board 5 with a built-in temperature measurement circuit.
  • the printed circuit board 56b is fixed to the main body case 51, and the printed circuit boards 56a and 56b are connected by a spring 64 and a cable 65 as shown in FIG.
  • the switch 57 and the liquid crystal temperature display 58 are exposed to the outside of the main body case 51 through holes provided in the main body case 51, respectively. Pressing the switch 57 starts the temperature measurement, and the LCD temperature display 58 digitally displays the measured temperature.
  • the slide mechanism 59 includes electromagnets 66a and 66b provided on the opposing surfaces of the printed circuit boards 56a and 56b, respectively, and printed circuit boards 56a and 56b. Concatenate Spring 64. Normally, the thermopile sensor 55 and the printed board 56 a are urged in the direction of the printed board 56 b by the elastic force of the spring 64. In such a case, the thermopile sensor 55 is located at a small distance from the sensor heating block 54 as shown in FIG. 4 (a). At the time of temperature measurement, by energizing the electromagnets 66a and 66b, the thermopile sensor 55 and the printed circuit board 56a are urged in the sensor heating block 54 direction due to the repulsion by electromagnetic induction. As shown in FIG.
  • thermopile sensor 55 comes into contact with the sensor heating block 54. After the temperature measurement, when the power to the electromagnets 66a and 66b is released, the thermopile sensor 55 and the printed circuit board 56a are attached in the direction of the printed circuit board 56b by the elastic force of the spring 64. Returned to the original position.
  • thermopile sensor 55 provided in the ear thermometer outputs a voltage that depends on the amount of infrared radiation radiated from the eardrum and the temperature of the thermopile sensor 55. That is, the thermopile sensor 55 outputs a voltage corresponding to the difference between the temperature of the measurement target and the temperature of the thermopile sensor 55, and the output is such that the temperature of the measurement target is higher than the temperature of the thermopile sensor 55. In this case, it is output as a positive voltage, and when the temperature of the measurement target is lower than the temperature of the thermopile sensor 55, it is output as a negative voltage. When the temperature of the measurement target is equal to the temperature of the thermopile sensor 55, the output of the thermopile sensor 55 becomes 0.
  • the operational amplifier 67 connected to the thermopile sensor 55 amplifies the small voltage output from the thermopile sensor 55 to a predetermined magnitude.
  • a comparator (voltage comparator) IC 68 connected to the operational amplifier 67 detects the presence or absence of the output of the thermopile sensor 55 amplified by the operational amplifier 67. That is, the comparator IC 68 sends a signal to the microcomputer 69 whether or not the output of the thermopile sensor 55 is 0, regardless of the magnitude of the output of the thermopile sensor 55 and whether the output is positive or negative.
  • the temperature of the thermopile sensor 55 is output as a voltage due to a change in the resistance value of a temperature measuring element such as a thermometer attached to the thermopile sensor 55.
  • An operational amplifier 70 connected to the thermopile sensor 55 amplifies the output from the temperature measuring element.
  • the microcomputer 69 has a built-in AD converter, and the microcomputer 69 performs arithmetic processing based on the output signal from the comparator IC 68 and the output signal from the operational amplifier 70, and outputs the result to the liquid crystal temperature display 58. Sends the temperature value output of the measurement target.
  • the liquid crystal temperature display 58 digitally displays the temperature of the object to be measured.
  • the drive IC 71 transmits a heating command signal from the microcomputer 69 to a sensor heating block 54 having a heater.
  • the sensor heating block 54 is heated from the micro computer 69 so that the temperature of the sensor heating block 54 becomes a preset temperature, for example, about 45 ° C before the temperature measurement is started.
  • a heating command signal is sent to the block 54. Therefore, at the start of temperature measurement, the temperature of the sensor heating block 54 has risen to the set temperature.
  • thermopile sensor 55 When a command to start temperature measurement is transmitted from the outside to the microcomputer 69, the slide mechanism 59 operates, and the thermopile sensor 55 comes into contact with the sensor heating work 54 as described above. Then, the thermopile sensor 55 is rapidly heated by the heat conducted from the preheated sensor heating block 54, and the output of the thermopile sensor 55 decreases rapidly. When the heating proceeds and the temperature of the thermopile sensor 55 becomes equal to the temperature of the eardrum to be measured, the output of the thermopile sensor 55 becomes 0. Since the output signal of the thermopile sensor 55 is sent to the micro computer 69 by the comparator IC 68, the temperature of the thermopile sensor 55 at the time when the output of the thermopile sensor 55 becomes 0 is obtained. The microphone computer 69 performs arithmetic processing based on the output from the temperature measuring element to detect the temperature of the eardrum to be measured. The detected temperature of the eardrum is recognized by being displayed on the liquid crystal temperature indicator 58.
  • the ear-type thermometer provides the waveguide and the thermopile sensor by providing the truncated cone-shaped thermopile sensor 55 at the tip of the case body 51.
  • the need for supporting plates and other components is eliminated, and the distance between the thermopile sensor and the eardrum is reduced, so the infrared energy increases in proportion to the square of the distance.
  • a significant improvement in the sensitivity of the thermopile sensor leads to a large increase in output, resulting in an inexpensive high-accuracy radiation thermometer with a small number of components while improving measurement accuracy.
  • thermopile sensor 55 having a truncated cone shape, a sensor heating block 54 having a hollow portion conforming to the truncated cone shape, a heating device for heating the sensor heating block 54, and a slide mechanism 5
  • the thermopile sensor 55 can be heated by sliding the thermopile sensor 55 on the pre-heated sensor heating block 54, so that the measurement time can be reduced as the heating time is reduced.
  • the maximum contact area can be obtained only by sliding the frusto-conical thermopile sensor 55 to the sensor heating block 54 by a small distance. Therefore, the maximum heating or heat radiation effect can be obtained with the minimum slide amount.
  • the slide mechanism is the slide mechanism 59 using the electromagnets 66 a and 66 b and the spring 64, but is not limited thereto.
  • a manual slide mechanism that manually slides the thermopile sensor with respect to the sensor heating block may be used. Even with such a manual slide mechanism, the maximum contact area can be obtained simply by sliding the frusto-conical thermopile sensor 55 to the sensor heating block 54 a small distance. Is received. Therefore, the maximum heating or heat radiation effect can be obtained with the minimum slide amount.
  • FIG. 6 description of the same parts as those of the above-described embodiment will be omitted, and only different parts will be described.
  • a radiation thermometer according to another embodiment of the present invention is an ear thermometer, and the sensor heating block 54 in the ear thermometer described above does not include a heating device and has a sensor heat radiation block 72. Has become.
  • the heating device is attached to the thermopile sensor 55.
  • a heating device 73 is wound around the outer peripheral surface of the thermopile sensor 55.
  • the cable 63 in the ear thermometer described above is unnecessary.
  • the temperature of the thermopile sensor 55 is a preset temperature, for example, about 42 ° C. before the start of temperature measurement.
  • the slide mechanism 59 is activated by the instruction to start temperature measurement, and the thermopile sensor 55 Contacts the heat dissipation block 72 of the sensor. Then, the heat of the thermopile sensor 55 is conducted to the sensor heat dissipating block 72, whereby the heat is rapidly dissipated, and the output of the thermopile sensor 55 increases rapidly.
  • the output of the thermopile sensor 55 becomes 0. Thereafter, the temperature of the eardrum to be measured is detected in the same procedure as the ear thermometer described above.
  • the heating device attached to the thermopile sensor 55 is such that the heating device 73 is wound on the outer peripheral surface of the thermopile sensor 55 as described above.
  • the invention is not limited to this.
  • a heating element or the like may be provided inside the package of the thermopile sensor 55.
  • a thermo module using a Peltier element may be used.
  • FIG. 7A is a perspective view showing a thermo module 74 attached to the ear thermometer according to the present embodiment
  • FIG. 7B is a perspective view showing the thermo module 74 with the thermo module 74.
  • FIG. 6 is a perspective view showing a state where the display unit is attached to a fifth embodiment.
  • FIG. 7 (b) for the sake of convenience, the bottom of the truncated cone-shaped sensor heat-dissipating block 72 is omitted.
  • the thermo module 74 has a Peltier element 75 and lead wires 76.
  • the upper surface of the Peltier element 75 has a cooling surface 77, and the lower surface has a heating surface 78. Has become.
  • the Peltier element 75 is an element having a property of absorbing heat on the cooling surface 77 and releasing heat from the heating surface 78 by the Peltier effect when energized.
  • the heating surface 78 of the Peltier element 75 is adhered almost to the center of the stem 45 of the thermopile sensor 55, and cooling is performed.
  • the tip 80 of the flat plate 79 attached to the surface 77 is adhered to the inner peripheral surface of the sensor heat radiation block 72.
  • the lead wire 76 is connected to the printed circuit board 56a.
  • the flat plate 79 is formed of a metal having good heat conductivity, and has elasticity so as not to hinder the slide of the thermopile sensor 55.
  • thermometer In the ear thermometer to which the thermo module 74 shown in FIG. 7 is attached, the Peltier element is simultaneously heated when the thermopile sensor 55 is preheated before the temperature measurement is started.
  • the cooling surface 7 7 absorbs the heat of the sensor radiating block 72 through the flat plate 79, that is, cools the sensor radiating block 72, so the sensor radiating block 72 must be Can be kept cool. Therefore, when the thermopile sensor 55 is in contact with the sensor heat radiation block 72 when the slide mechanism 59 is activated by the instruction to start temperature measurement, the thermopile sensor 55 can be cooled efficiently in a short time. .
  • the ear thermometer includes a frusto-conical thermopile sensor 55, a heating device for heating the thermopile sensor 55, and a hollow portion adapted to the frusto-conical shape.
  • the preheated thermopile sensor 55 can be cooled by sliding it on the sensor heat dissipating block 59.
  • the thermopile sensor can be cooled (temperature adjusted) in a shorter time than when the previously heated thermopile sensor is cooled by natural heat radiation. Therefore, the measurement time can be shortened.
  • the heating device is a thermo module using a Peltier element
  • the heating surface of the thermo module is connected to the thermopile sensor 55
  • the cooling surface is connected to the sensor radiation block 72. 5
  • the sensor heat radiation process 72 can be cooled. Therefore, cooling (temperature adjustment) of the thermopile sensor 55 can be performed in a shorter time. Therefore, the measurement time can be further reduced.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)

Abstract

L'invention se rapporte à un thermomètre de mesure du rayonnement comportant un capteur d'infrarouge qui peut, même lorsqu'il est utilisé dans de petits dispositifs électroniques, réduire les limitations relatives à sa position de fonctionnement. De manière spécifique, l'invention se rapporte à un thermomètre de mesure du rayonnement comportant un boîtier (51), une section de détection des infrarouges (52) installée dans ledit boîtier, et une section de circuit de mesure de la température (53). La section de détection des infrarouges (52) comporte un bloc (54) de chauffage du capteur et un capteur à thermopile (55). La section de circuit de mesure de la température (53) comporte des cartes à circuits imprimés (56a, 56b), un commutateur (57), un circuit d'affichage à cristaux liquides (58) et un mécanisme coulissant (59) qui sert à faire coulisser la thermopile (55) par rapport au bloc (54) de chauffage du capteur. La sonde (60) située au niveau de la pointe possède une forme effilée en direction de l'extrémité avant. La section de détection des infrarouges (52) comporte le capteur à thermopile (55) en forme de cône tronqué et une partie creuse qui est conçue pour loger ledit capteur à thermopile (55).
PCT/JP1998/004653 1998-10-15 1998-10-15 Capteur d'infrarouge et thermometre de mesure du rayonnement WO2000022390A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU94616/98A AU9461698A (en) 1998-10-15 1998-10-15 Infrared sensor and radiation thermometer
PCT/JP1998/004653 WO2000022390A1 (fr) 1998-10-15 1998-10-15 Capteur d'infrarouge et thermometre de mesure du rayonnement
PCT/JP1999/002410 WO2000022391A1 (fr) 1998-10-15 1999-05-10 Capteur infrarouge et pyrometre a radiation
JP55280699A JP3346583B2 (ja) 1998-10-15 1999-05-10 赤外線センサ及び放射温度計
AU36298/99A AU3629899A (en) 1998-10-15 1999-05-10 Infrared sensor and radiation pyrometer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1998/004653 WO2000022390A1 (fr) 1998-10-15 1998-10-15 Capteur d'infrarouge et thermometre de mesure du rayonnement

Publications (1)

Publication Number Publication Date
WO2000022390A1 true WO2000022390A1 (fr) 2000-04-20

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PCT/JP1998/004653 WO2000022390A1 (fr) 1998-10-15 1998-10-15 Capteur d'infrarouge et thermometre de mesure du rayonnement
PCT/JP1999/002410 WO2000022391A1 (fr) 1998-10-15 1999-05-10 Capteur infrarouge et pyrometre a radiation

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PCT/JP1999/002410 WO2000022391A1 (fr) 1998-10-15 1999-05-10 Capteur infrarouge et pyrometre a radiation

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AU (2) AU9461698A (fr)
WO (2) WO2000022390A1 (fr)

Cited By (3)

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JP2002315727A (ja) * 2001-04-19 2002-10-29 Pigeon Corp 体温計
JP2002540418A (ja) * 1999-03-25 2002-11-26 ブラウン ゲーエムベーハー 加熱可能なプローブヘッドと保護カバーを有する赤外線温度計
FR2827956A1 (fr) * 2001-07-25 2003-01-31 Min Ying Chen Procede de stabilisation d'un thermometre medical et dispositif associe

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JP4621363B2 (ja) * 2001-01-12 2011-01-26 株式会社バイオエコーネット 赤外線体温計
JP4580562B2 (ja) * 2001-01-23 2010-11-17 株式会社バイオエコーネット 非接触型温度センサーおよびそれを用いた赤外線体温計

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JPH0663022A (ja) * 1992-08-21 1994-03-08 Terumo Corp 放射体温計
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JPH06347321A (ja) * 1993-06-11 1994-12-22 Fujitsu Ltd 赤外線センサ用コールドシールド
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JPH0528617B2 (fr) * 1988-09-15 1993-04-26 Temupu Suteitsuku Corp
JP2588792B2 (ja) * 1990-09-21 1997-03-12 山武ハネウエル株式会社 温熱感覚演算方法および装置
JPH0663022A (ja) * 1992-08-21 1994-03-08 Terumo Corp 放射体温計
JPH0690910A (ja) * 1992-09-17 1994-04-05 Terumo Corp 体温計

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002540418A (ja) * 1999-03-25 2002-11-26 ブラウン ゲーエムベーハー 加熱可能なプローブヘッドと保護カバーを有する赤外線温度計
JP2002315727A (ja) * 2001-04-19 2002-10-29 Pigeon Corp 体温計
JP4686047B2 (ja) * 2001-04-19 2011-05-18 ピジョン株式会社 体温計
FR2827956A1 (fr) * 2001-07-25 2003-01-31 Min Ying Chen Procede de stabilisation d'un thermometre medical et dispositif associe

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AU9461698A (en) 2000-05-01
AU3629899A (en) 2000-05-01
WO2000022391A1 (fr) 2000-04-20
JP3346583B2 (ja) 2002-11-18

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