WO2021161862A1 - 温度計 - Google Patents

温度計 Download PDF

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Publication number
WO2021161862A1
WO2021161862A1 PCT/JP2021/003868 JP2021003868W WO2021161862A1 WO 2021161862 A1 WO2021161862 A1 WO 2021161862A1 JP 2021003868 W JP2021003868 W JP 2021003868W WO 2021161862 A1 WO2021161862 A1 WO 2021161862A1
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WIPO (PCT)
Prior art keywords
temperature
thermometer
housing
external space
measurement target
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2021/003868
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English (en)
French (fr)
Japanese (ja)
Inventor
中西　保之
直博 大須賀
雅夫 水田
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Horiba Ltd
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Horiba Ltd
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Publication date
Application filed by Horiba Ltd filed Critical Horiba Ltd
Priority to JP2022500344A priority Critical patent/JP7564185B2/ja
Publication of WO2021161862A1 publication Critical patent/WO2021161862A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • G01J5/05—Means for preventing contamination of the components of the optical system; Means for preventing obstruction of the radiation path
    • 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

Definitions

  • the present invention relates to a thermometer that measures the temperature of a measurement target based on the intensity of infrared rays generated from the measurement target existing in the external space.
  • thermometer capable of measuring the temperature of a substance in a non-contact manner based on the intensity of infrared rays generated from an object.
  • This thermometer is called a radiation thermometer.
  • the radiation thermometer includes an infrared sensor that detects infrared rays generated from an object and a lens that allows the sensor to receive the infrared rays, and can easily measure the temperature without contact. Therefore, the radiation thermometer can be used to measure the temperature of plants cultivated in greenhouses, such as products manufactured in various plants.
  • the radiation thermometer can easily measure the temperature of the object to be measured without contact, it may not be able to measure the temperature accurately in a harsh environment such as a large temperature fluctuation in the external space where it is installed. Further, if water droplets (mist) are present in the external space and adhere to the lens surface of the radiation thermometer, the infrared sensor cannot properly receive the infrared rays emitted from the object to be measured. As a result, the temperature may not be measured accurately.
  • Patent Document 1 compressed gas is discharged to the window portion of the housing to remove dust adhering to the window portion. It is considered that the adhesion of water droplets to the window can be prevented by discharging the gas to the window in this way, but when the radiation thermometer is placed near the measurement target, the discharged gas is the measurement target. It hits the target and adversely affects the measurement target, or the gas that hits the measurement target cannot accurately measure the temperature of the measurement target.
  • the temperature of the infrared sensor itself also fluctuates due to the temperature fluctuation, and the signal output from the infrared sensor fluctuates according to this temperature fluctuation. As a result, a temperature different from the actual temperature of the external space may be output as the measurement result.
  • An object of the present invention is to accurately measure the temperature of a measurement object existing in an external space under a harsh environment based on infrared rays generated from the measurement object.
  • the thermometer measures the temperature of the measurement target based on the intensity of infrared rays generated from the measurement target existing in the external space.
  • This thermometer includes a radiation thermometer, a first housing, a first opening, and a temperature maintenance device.
  • the radiation thermometer has an infrared sensor that detects infrared rays and a lens that causes the infrared sensor to receive infrared rays.
  • the first housing houses the radiation thermometer in the internal space.
  • the first opening is provided in the first housing and allows the lens to penetrate the external space.
  • the temperature maintenance device stabilizes the temperature of the internal space of the first housing at a first temperature higher than the temperature upper limit of the temperature of the external space.
  • the air warmed in the internal space is discharged through the opening to prevent the intrusion of water droplets from the outside and to prevent the water droplets from entering the lens. Can be prevented from adhering.
  • the temperature of the internal space is kept almost constant, so that the signal output from the infrared sensor is prevented from fluctuating according to the temperature fluctuation of the external space. can.
  • the above thermometer can accurately measure the temperature of the object to be measured existing in the external space in a harsh environment.
  • the thermometer may further include a second housing and a second opening.
  • the second housing houses the first housing.
  • the second opening is provided at a position corresponding to the first opening in the second housing, and penetrates the lens and the external space together with the first opening. As a result, it is possible to prevent the temperature of the internal space of the first housing from being affected by the temperature fluctuation of the external space.
  • the thermometer may further include a cooling device for cooling the second housing. As a result, it is possible to prevent the temperature of the internal space of the first housing from being affected by the temperature of the external space.
  • the infrared sensor may have a light receiving member that receives infrared rays and generates heat, and a thermocouple that generates thermoelectromotive force according to the difference between the reference temperature and the temperature of the light receiving member.
  • the thermometer may further include a mounting member on which the radiation thermometer is mounted.
  • the temperature maintenance device is fixed to the mounting member. As a result, the temperature of the radiation thermometer can be more reliably maintained at the first temperature.
  • the thermometer may further include a stop device for stopping the temperature maintenance device when the temperature of the internal space of the first housing reaches the second temperature, which is a predetermined temperature higher than the first temperature.
  • the first housing may be made of metal or resin. As a result, deterioration of the first housing can be suppressed even in a harsh environment of the external space.
  • the thermometer may further include a limiting member that limits the movement of the object to be measured.
  • the external space may contain mist.
  • the pressure of the internal space of the first housing is made higher than the pressure of the external space, and the pressure of the external space is increased. It is possible to prevent the contained mist from entering the internal space of the first housing. As a result, it is possible to prevent water droplets from adhering to the lens of the radiation thermometer.
  • thermometer which concerns on 1st Embodiment is installed.
  • the figure which shows the structure of the thermometer which concerns on 2nd Embodiment The side view of the thermometer which concerns on 2nd Embodiment. Top view of the thermometer according to the second embodiment.
  • thermometer 100 is installed in a greenhouse G (vinyl house) as shown in FIG. 1, for example, at a place P where vegetables, fruits, etc. to be grown are planted.
  • the thermometer 100 measures the leaf temperature of vegetables, fruits and the like to be grown, and the temperature of fruits (fruits).
  • FIG. 1 is a diagram showing an example of a greenhouse in which a thermometer according to the first embodiment is installed.
  • Greenhouse G is provided with equipment for growing the above vegetables, fruits, etc. (for example, irrigation system, temperature control equipment, mist spraying device).
  • the greenhouse G of the present embodiment is for growing vegetables (for example, tomatoes) and fruits (for example, strawberries) that are difficult to grow in a high temperature area, and is sprayed with mist. Therefore, the thermometer 100 of the present embodiment has a configuration capable of appropriately measuring the leaf temperature and the fruit temperature even in an environment in which such a mist is present. In this way, measuring the leaf temperature and fruit temperature of vegetables and fruits grown in greenhouse G where mist exists is to grow high-quality vegetables and fruits with high sugar content. It's very important.
  • FIG. 2 is a perspective view of the thermometer according to the first embodiment.
  • FIG. 3 is an exploded view of the thermometer according to the first embodiment.
  • the thermometer 100 according to the present embodiment includes a radiation thermometer 1.
  • the radiation thermometer 1 measures the temperature of the measurement target M based on the intensity of the infrared IR (FIG. 4) generated from the measurement target M (for example, the fruit or leaf of a vegetable or fruit) (FIG. 4) existing in the external space. To measure.
  • the radiation thermometer 1 includes an infrared sensor 13 (FIG.
  • thermometer 1 that detects infrared rays generated from the measurement target M, and a lens 11 (FIG. 4) that causes the infrared sensor 13 to receive infrared rays.
  • the radiation thermometer 1 is mounted on a metal (for example, aluminum) mounting member 2 inside the thermometer 100.
  • the mounting member 2 is attached to the first bottom member 4a and the second bottom member 5a of the thermometer 100 by being fixed to the fixing member 2a.
  • a heater 3 (an example of a temperature maintaining device) is fixed to the bottom of the mounting member 2.
  • the mounting member 2 is provided with a temperature sensor (for example, a thermocouple) (not shown) for measuring the temperature of the mounting member 2.
  • the heater 3 is controlled by the temperature controller 3a while measuring the temperature of the mounting member 2 with the temperature sensor, thereby stabilizing the temperature of the mounting member 2 at a predetermined temperature set by the temperature controller 3a.
  • the temperature controller 3a outputs a control signal for adjusting the temperature to the heater drive unit 3b.
  • the heater drive unit 3b supplies electric power based on the control signal received from the temperature controller 3a to the heater 3.
  • the heater drive unit 3b is, for example, a device that adjusts and outputs electric power to the heater 3 such as an SSR (Solid State Relay).
  • the temperature of the radiation thermometer 1 can be stabilized at the predetermined temperature.
  • the temperature of the first internal space S1 in which the radiation thermometer 1 is housed can be stabilized.
  • a thermostat 3c (an example of a stop device) is fixed to the mounting member 2.
  • the thermostat 3c prevents the temperature of the mounting member 2 from becoming excessive. Specifically, the thermostat 3c stops the power supply from the heater drive unit 3b to the heater 3 when the temperature of the mounting member 2 becomes the second temperature T2 (for example, 60 ° C.) or higher. As a result, the temperature of the mounting member 2 becomes excessive, and the failure of the radiation thermometer 1 can be prevented.
  • the thermometer 100 includes a first lid member 4b.
  • the first lid member 4b has a hollow three-dimensional shape with an open bottom, and is fixed to the first bottom member 4a at the bottom.
  • the first housing 4 having the first internal space S1 is formed. That is, the first housing 4 houses the radiation thermometer 1 in the first internal space S1.
  • the first housing 4 (first lid member 4b) has a first opening O1 at a position corresponding to the lens 11 of the radiation thermometer 1.
  • the first bottom member 4a and the first lid member 4b (first housing 4) are made of, for example, a material such as metal or resin. As a result, deterioration of the first housing 4 can be suppressed even in a harsh environment of the external space.
  • the thermometer 100 includes a second lid member 5b.
  • the second lid member 5b has a hollow three-dimensional shape with an open bottom, and is fixed to the second bottom member 5a at the bottom.
  • the second housing 5 having the second internal space S2 is formed. That is, the second housing 5 houses the first housing 4 (and the radiation thermometer 1) in the second internal space S2.
  • the second housing 5 (second lid member 5b) has a second opening O2 at a position corresponding to the lens 11 of the radiation thermometer 1.
  • the second bottom member 5a and the second lid member 5b (second housing 5) are made of aluminum. As a result, the weight of the thermometer 100 can be reduced.
  • a tripod fixing portion 6 is provided at the bottom of the second housing 5 (second lid member 5b).
  • the tripod is fixed to the tripod fixing portion 6 and the installation height of the thermometer 100 can be adjusted.
  • the radiation thermometer 1 is housed in the first internal space S1 of the first housing 4, and the temperature of the first internal space S1 is stabilized by the heater 3. Be transformed.
  • the temperature of the first internal space S1 is kept substantially constant, so that the radiation thermometer 1 is not affected by the temperature fluctuation of the external space and the temperature is stable. It can operate in the first internal space S1 that has been converted. As a result, it is possible to prevent the signal output from the infrared sensor 13 of the radiation thermometer 1 from fluctuating according to the temperature fluctuation in the external space.
  • the first housing 4 and the radiation thermometer 1 are housed in the second internal space S2 of the second housing 5. That is, the radiation thermometer 1 is housed in the first internal space S1 which is the innermost part of the "nested" double structure of the first housing 4 and the second housing 5. As a result, the temperature of the first internal space S1 of the first housing 4 can be further suppressed from being affected by the temperature fluctuation of the external space.
  • FIG. 4 is a diagram showing the configuration of a radiation thermometer.
  • FIG. 5 is a diagram showing a configuration of an infrared sensor.
  • the radiation thermometer 1 is a device that receives infrared rays generated from the measurement target M and measures the temperature of the measurement target M based on the intensity of the received infrared rays.
  • the radiation thermometer 1 includes a lens 11, an infrared sensor 13, a signal converter 15, and a calculation unit 17.
  • the lens 11 causes the light receiving member 131 (FIG. 5) of the infrared sensor 13 to receive the infrared IR generated from the measurement target M. Specifically, the lens 11 collects infrared IR on the surface of the light receiving member 131.
  • the infrared sensor 13 detects the infrared IR focused by the lens 11 and outputs a signal based on the intensity of the received infrared IR.
  • the infrared sensor 13 is, for example, a thermopile and has a configuration as shown in FIG. That is, the infrared sensor 13 has a light receiving member 131, a thermocouple 133, and an output terminal 135.
  • the surface of the light receiving member 131 is irradiated with infrared IR focused by the lens 11.
  • the light receiving member 131 is a member that generates heat according to the intensity of the infrared IR irradiated on the surface.
  • the surface of the light receiving member 131 irradiated with infrared IR is coated with a substance (for example, fine gold particles) that easily absorbs infrared IR.
  • the thermocouple 133 outputs a thermoelectromotive force based on the difference between the temperature of the light receiving member 131 and the reference temperature (the temperature of the cold contact CP).
  • the thermocouple 133 has a plurality of first metal members 133a and a plurality of second metal members 133b. One end of each first metal member 133a and each second metal member 133b is connected to each other in the light receiving member 131. On the other hand, the other ends of each first metal member 133a and each second metal member 133b are connected to each other at a cold contact CP (for example, the main body of the radiation thermometer 1).
  • thermocouple 133 the thermocouple composed of one first metal member 133a and one second metal member 133b measures the difference between the temperature of the light receiving member 131 and the temperature of the cold contact CP. .. Further, in the thermocouple 133, a thermocouple composed of one first metal member 133a and one second metal member 133b is connected in series. With such a configuration, the thermocouple 133 can sensitively detect the change in the light receiving intensity of the infrared IR and improve the sensitivity of the temperature measurement of the radiation thermometer 1.
  • the output terminal 135 is connected to both ends of the thermocouple 133 and is a terminal for taking out the thermoelectromotive force generated by the thermocouple 133 to the outside. Therefore, the signal converter 15 is connected to the output terminal 135.
  • the signal converter 15 of the radiation thermometer 1 converts the thermoelectromotive force (analog signal) generated by the thermocouple 133 into a digital signal.
  • the signal converter 15 is, for example, an A / D converter.
  • the arithmetic unit 17 is, for example, a computer system composed of a CPU, a storage device (RAM, ROM, etc.), and various interfaces. Further, the calculation unit 17 may be a SoC (System on Chip) having these configurations. The calculation unit 17 calculates the temperature of the measurement target M based on the digital signal input from the signal converter 15, that is, the thermoelectromotive force value measured by the thermocouple 133 of the infrared sensor 13. Further, the calculation unit 17 executes general control of the radiation thermometer 1 and the thermometer 100. The calculation of the temperature of the measurement target M and the control of the radiation thermometer 1 and the thermometer 100 in the calculation unit 17 may be executed by a computer program stored in the storage device of the calculation unit 17. Further, a part or all of the above calculation and / or control may be realized by hardware.
  • SoC System on Chip
  • thermometer 100 is installed in the vicinity of the measurement target M.
  • the measurement target M is a leaf of a vegetable being grown in the greenhouse G, for example, as shown in FIG. 6, the tripod 300 is fixed to the tripod fixing portion 6 and the temperature is set to the height of the leaf which is the measurement target M.
  • the total 100 is fixed, and the second opening O2 (first opening O1) of the thermometer 100 is brought close to the measurement target M.
  • FIG. 6 is a diagram showing an example of the installation state of the thermometer.
  • the tripod is an example, and for example, a fixing method using a fixing frame can also be used.
  • the heater 3 is operated by the temperature controller 3a.
  • the set temperature of the temperature controller 3a is set so that the temperature of the mounting member 2 controlled by the heater 3 becomes the first temperature T1 which is higher than the maximum temperature of the greenhouse G. That is, the first temperature T1 is a temperature higher than the upper limit temperature of the greenhouse G.
  • the temperature is set to be about 10 ° C higher than the maximum temperature of the greenhouse G (for example, 45 ° C).
  • the first temperature T1 can be appropriately changed depending on the usage environment of the thermometer 100 and the like.
  • the temperature of the mounting member 2 is stabilized at the first temperature T1 by the control of the heater 3 during the temperature measurement of the measurement target M, and the radiation thermometer 1 is the first housing 4 and the second housing.
  • the temperature of the radiation thermometer 1 is almost constant during temperature measurement without being affected by the temperature fluctuation of the external space (household G). Be stabilized. Since the temperature of the radiation thermometer 1 is kept almost constant during the temperature measurement without being affected by the temperature fluctuation of the external space, the temperature fluctuation of the cold contact CP of the infrared sensor 13 disappears and the temperature is output from the infrared sensor 13.
  • the thermoelectric power does not fluctuate according to the temperature fluctuation in the external space. As a result, the radiation thermometer 1 can accurately measure the temperature of the measurement target M without being affected by the temperature fluctuation of the external space (greenhouse G).
  • the temperature of the mounting member 2 becomes higher than the upper limit temperature (maximum temperature) of the temperature of the external space
  • the air in the first internal space S1 is heated by the mounting member 2, and the first internal space is heated.
  • the temperature inside S1 is also higher than the maximum temperature in the external space. Since the first internal space S1 is connected to the external space by the first opening O1 and the second opening O2, the temperature of the first internal space S1 becomes higher than the maximum temperature of the external space, so that the first internal space S1 An air flow to the external space occurs. That is, the air warmed in the first internal space S1 is discharged through the first opening O1 and the second opening O2.
  • the first opening O1 and the second opening O2 are provided so as to correspond to the lens 11 of the radiation thermometer 1, that is, to penetrate the lens 11 and the external space, the first internal space S1 described above The air flow to the external space occurs in the vicinity of the lens 11. As a result, it is possible to prevent the air in the external space from reaching the lens 11. As a result, even if the air in the external space contains mist, it is possible to prevent the mist (water droplets) and the like from adhering to the lens 11.
  • thermometer 100 of the present embodiment Since water hardly transmits infrared rays, if water droplets are attached to the lens 11, the infrared IR from the measurement target M is blocked by the water droplets, and the temperature of the measurement target M cannot be accurately measured by the radiation thermometer 1. ..
  • the thermometer 100 of the present embodiment as described above, even if the mist is sprayed in the external space and the air in the external space contains the mist, the lens 11 is being measured during the temperature measurement of the measurement target M. The structure is such that water droplets do not adhere to the surface. As a result, the thermometer 100 of the present embodiment can accurately measure the temperature of the measurement target M.
  • the air flow generated by raising the temperature of the first internal space S1 to be higher than the maximum temperature of the external space is large enough to prevent the air in the external space from reaching the lens 11, while measuring. It is small enough not to affect the temperature of the target M. That is, by configuring the temperature of the first internal space S1 to be higher than the maximum temperature of the external space, the thermometer 100 of the present embodiment does not adhere water droplets to the lens 11, but does not affect the temperature of the measurement target M. It is possible to accurately measure the temperature of the measurement target M existing in the external space of a harsh environment such as containing mist by generating an air flow having an optimum flow rate in the vicinity of the lens 11.
  • thermometer 100 of the present embodiment When the thermometer 100 of the present embodiment is actually used to measure the leaf temperature of tomatoes grown in the greenhouse G sprayed with mist (that is, the measurement target M is a tomato leaf), as shown in FIG. In addition, the thermometer 100 showed a measurement result close to the actual leaf temperature. In FIG. 7, the solid line is the measurement result of the leaf temperature by the thermometer 100.
  • FIG. 7 is a diagram showing an example of the actual measurement result of the temperature of the object to be measured by the thermometer.
  • thermometer 100 is a predetermined position (leaves, fruits, etc.) of vegetables (tomatoes) and fruits (strawberry) being grown in greenhouse G where mist is sprayed.
  • the temperature can be measured accurately.
  • temperature measurement using a plant such as a vegetable or fruit as the measurement target M it may be desired to measure the temperature at a specific position of the measurement target M as much as possible. That is, there is a case where it is desired to fix the relative position between the thermometer 100 and the measurement target M.
  • the measurement location As a method of specifying the measurement location, there is a method of indicating the measurement location with the light emitted from the laser marker or the LED.
  • the sunlight is too strong under the sunlight in the daytime, and the marker is very difficult to see or the marker cannot be seen.
  • the laser marker cannot be constantly irradiated, it is necessary to irradiate the laser marker every time the measurement location is confirmed. When the operation of irradiating the laser marker is performed every time the measurement location is confirmed, the measurement location may shift.
  • the thermometer 200 further includes a limiting member 20 that limits the movement of the measurement target M in order to fix the position relative to the measurement target M as much as possible.
  • a total of three limiting members 20 are provided on the left and right side surfaces and the upper surface of the second housing 5 of the thermometer 200.
  • the position of the pair of limiting members 20 provided on the left and right side surfaces of the second housing 5 in the height direction is preferably the position where the second opening O2 (first opening O1) is provided.
  • FIG. 8 is a diagram showing a configuration of a thermometer according to the second embodiment.
  • thermometer 200 according to the second embodiment has the same configuration and function as the thermometer 100 according to the first embodiment, except that the limiting member 20 is fixed to the second housing 5. Therefore, the description other than the limiting member 20 will be omitted here.
  • the limiting member 20 is provided with a plurality of scales 21a to 21d. Specifically, one scale 21a is attached at a position corresponding to the front end (second opening O2) of the second housing 5. The other scales 21b to 21d are provided at equal intervals in the direction away from the front end of the second housing 5.
  • FIG. 9A is a side view of the thermometer according to the second embodiment.
  • FIG. 9B is a top view of the thermometer according to the second embodiment.
  • the number of scales 21a to 21d attached to the limiting member 20 is 4, but this number can be arbitrary depending on the usage conditions of the thermometer 200 and the like. Further, the distance between the two scales can be made arbitrary depending on the usage conditions of the thermometer 200 and the like.
  • the thermometer 200 By providing the limiting member 20 as shown in FIGS. 8 to 9B, the thermometer 200 according to the second embodiment accommodates the measurement target M inside the limiting member 20 as shown in FIGS. 9A and 9B. , The range in which the relative movement is possible with respect to the second housing 5 can be limited. As a result, the thermometer 200 can continuously measure the temperature at a specific position of the measurement target M. Further, by attaching the scales 21a to 21d to the limiting member 20, the distance between the measurement target M and the second opening O2 (that is, the lens 11 of the radiation thermometer 1) can be visually recognized. As a result, for example, it is possible to visually confirm whether the distance between the measurement target M and the lens 11 is within the temperature measurable range. Further, for example, the size (area) of the temperature measuring region of the measurement target M can be adjusted by adjusting the distance between the measurement target M and the lens 11 using the scales 21a to 21d in the temperature measurable range. ..
  • the limiting member 20 is a rod-shaped member.
  • the present invention is not limited to this, and the limiting member 20 can have an arbitrary shape (for example, a circular shape) as long as the measurement target can be held.
  • thermometers 100 and 200 described in the first and second embodiments described above generate steam (mist-like water droplets) in, for example, a food factory in addition to the greenhouse G on which the mist is sprayed. It can also be used for purposes such as measuring the temperature of a product in a production plant where the temperature fluctuates sharply.
  • thermometers 100 and 200 described in the first embodiment and the second embodiment are transmitted from the calculation unit 17 to another device, for example, in order to control the device. It may be used.
  • the temperature measurement results of vegetables and fruits measured by thermometers 100 and 200 can be used to control other devices in the greenhouse G to adjust the growing conditions of the vegetables and fruits.
  • a cooling device for example, a Perche element can be used.
  • the second housing 5 may be heated by the external space, and the temperature of the second internal space S2 may rise.
  • the temperature of the first internal space S1 becomes the temperature of the second internal space S2 even if the temperature of the first internal space S1 is adjusted to be constant by the heater 3. Can be affected by temperature. Therefore, by providing the cooling device in the second housing 5, it is possible to prevent the temperature of the first internal space from being affected by the temperature of the external space.
  • (D) For example, when the air in the external space flows in even if the temperature of the first internal space S1 is higher than the temperature of the external space, and / or, the air is sent from the first internal space S1 to the external space at a large flow rate. If it is difficult to affect the temperature of the measurement target M even if it flows out, the back side of the first housing 4 and / or the second housing 5 (the side provided with the first opening O1 and the second opening O2). A device for generating a gas flow such as a fan may be provided on the opposite side), and the air may flow out from the first internal space S1 to the external space by the device.
  • a device for generating a gas flow such as a fan may be provided on the opposite side
  • the present invention can be widely applied to a thermometer that measures the temperature of a measurement target based on the intensity of infrared rays generated from the measurement target existing in the external space.
  • Thermometer 1 Radiation thermometer 11 Lens 13 Infrared sensor 131
  • Light receiving member 133 Thermocouple 133a First metal member 133b Second metal member 135 Output terminal CP Cold contact 15
  • Signal converter 17 Calculation unit 2 Mounting member 2a Fixing member 3 Heater 3a Temperature controller 3b Heater drive unit 3c
  • Thermometer 4 First housing 4a First bottom member 4b First lid member S1 First internal space T1 First temperature O1 First opening 5 Second housing 5a Second bottom member 5b 2nd lid member S2 2nd internal space T2 2nd temperature O2 2nd opening 6
  • Tripod fixing part 20
  • Restricting member 21a, 21b, 21c, 21d Scale 300 Tripod G Greenhouse P Place M Measurement target IR Infrared

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  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Radiation Pyrometers (AREA)
PCT/JP2021/003868 2020-02-12 2021-02-03 温度計 Ceased WO2021161862A1 (ja)

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