WO2022269781A1 - 温度測定装置、温度測定方法、及び電気機器 - Google Patents
温度測定装置、温度測定方法、及び電気機器 Download PDFInfo
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- WO2022269781A1 WO2022269781A1 PCT/JP2021/023694 JP2021023694W WO2022269781A1 WO 2022269781 A1 WO2022269781 A1 WO 2022269781A1 JP 2021023694 W JP2021023694 W JP 2021023694W WO 2022269781 A1 WO2022269781 A1 WO 2022269781A1
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- temperature
- reference point
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- 238000009529 body temperature measurement Methods 0.000 title claims description 29
- 238000000034 method Methods 0.000 title claims description 20
- 238000009434 installation Methods 0.000 claims abstract description 19
- 238000009825 accumulation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 5
- 101100208381 Caenorhabditis elegans tth-1 gene Proteins 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000010411 cooking Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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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
- G01J5/06—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity
- G01J5/064—Ambient temperature sensor; Housing temperature sensor; Constructional details thereof
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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
- G01J5/0275—Control or determination of height or distance or angle information for sensors or receivers
-
- 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
- G01J5/52—Radiation pyrometry, e.g. infrared or optical thermometry using comparison with reference sources, e.g. disappearing-filament pyrometer
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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
- G01J5/70—Passive compensation of pyrometer measurements, e.g. using ambient temperature sensing or sensing of temperature within housing
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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
- G01J2005/0077—Imaging
Definitions
- the present disclosure relates to a temperature measurement device using a thermal image sensor, a temperature measurement method, and an electrical device.
- Patent Document 1 in a device for monitoring a containment vessel, a black body furnace capable of measuring absolute temperature is installed in the device, and by measuring the temperature of this black body furnace, the measurement object acquired by the infrared camera By correcting the relative temperature of the object to the absolute temperature, it is possible to measure the absolute temperature of the object without contact.
- Patent Document 2 a mirror-finished shutter is provided on the side facing a temperature-controlled infrared detector, and infrared rays emitted by the infrared detector itself are reflected by the shutter to be used as a reference heat source, which is used as a measurement target. By correcting the relative temperature of the object to the absolute temperature, the absolute temperature of the object to be measured is measured without contact.
- a temperature measurement device is a temperature measurement device that measures temperature in a space having an upper surface and a lower surface, and includes a thermal image sensor that acquires a relative temperature in the space and a temperature sensor that acquires an absolute temperature. , with a position different from the position where the temperature sensor is installed as a reference point, the measurement value of the temperature sensor, the vertical component of the distance from the installation position of the temperature sensor to the reference point, and the distance from the upper surface to the lower surface a reference point temperature estimator for estimating the absolute temperature of the reference point from the vertical component of the distance and the temperature coefficient of the space; and the absolute temperature of the reference point and the thermal image estimated by the reference point temperature estimator.
- the absolute temperature distribution generation unit determines a correction value from the relative temperature of the reference point by the sensor and generates an absolute temperature distribution from the relative temperature distribution by the thermal image sensor and the correction value.
- the temperature measurement method includes a reference point setting step in which a position different from a position where a temperature sensor that acquires an absolute temperature is installed as a reference point, a measured value of the temperature sensor, and installation of the temperature sensor a reference point temperature estimating step of estimating the absolute temperature of the reference point from the vertical component of the distance from the position to the reference point, the vertical component of the distance from the upper surface to the lower surface, and the temperature coefficient of the space; determining a correction value from the absolute temperature of the reference point estimated by the reference point temperature estimation step and the relative temperature of the reference point measured by the thermal image sensor; It has an absolute temperature distribution generating step for generating a temperature distribution.
- an electrical device controls functions based on an absolute temperature selected from an absolute temperature distribution generated by a temperature measurement device according to the present disclosure and an absolute temperature distribution generation unit of the temperature measurement device. .
- the absolute temperature of the object to be measured can be measured in a non-contact manner with a simple configuration without being restricted by the installation location.
- FIG. 1 is a block diagram showing a schematic configuration of a temperature measuring device according to Embodiment 1;
- FIG. 1 is a perspective view of a space in which a temperature measuring device according to Embodiment 1 is installed;
- FIG. 4 is a cross-sectional view showing part of a space in which the temperature measuring device according to Embodiment 1 is installed;
- FIG. 4 is an image diagram of a thermal image acquired by the thermal image sensor according to Embodiment 1.
- FIG. 4 is a flowchart showing a temperature measurement method according to Embodiment 1;
- 2 is a block diagram of a temperature measuring device according to Embodiment 2;
- FIG. 8 is a flowchart of a temperature measurement method according to Embodiment 2;
- FIG. 11 is a block diagram of a temperature measuring device according to Embodiment 3;
- 10 is a flowchart of a temperature measurement method according to Embodiment 3;
- FIG. 11 is a block diagram of an electric device according
- Embodiment 1 A temperature measuring device according to Embodiment 1 will be described with reference to FIGS. 1 to 5.
- FIG. 1 A temperature measuring device according to Embodiment 1 will be described with reference to FIGS. 1 to 5.
- a temperature measurement device 100 includes a thermal image sensor 1 such as an infrared camera for obtaining relative temperature, a temperature sensor 2 for obtaining absolute temperature by thermocouple or the like, and a microprocessor, a microprocessing unit, or the like.
- a reference point temperature estimator 3 and an absolute temperature distribution generator 4 are provided.
- the temperature measuring device 100 is installed in a space 99 having a ceiling as an upper surface 6 and a floor as a lower surface 5 .
- the space 99 is closed by the upper surface 6, the lower surface 5, and the side surfaces 7 such as walls.
- the vertical component of the distance and the vertical component of the distance from the upper surface 6 to the lower surface 5 are input to the temperature measuring device 100 as installation information at the time of installation, for example.
- the vertical component of the distance from the reference point S to the temperature sensor 2 is the height H1 from the lower surface 5 to the temperature sensor 2
- the vertical component of the distance from the upper surface 6 to the lower surface 5 is from the lower surface 5 to the upper surface 6. is the height H up to
- the relative temperature distribution acquired by the thermal image sensor 1 will be described using FIG.
- a thermal image sensor 1 captures radiant heat emitted from the surface of an object.
- the thermal image sensor 1 displays the captured radiant heat quantity as an image in gradation, and for example, as shown in FIG. Objects are represented as images.
- the lower surface 5 is the floor
- the upper surface 6 is the ceiling
- the opening 8 is the window
- the light emitter 9 is lighting
- the non-moving heat source 10 is a heater
- a cooking appliance etc.
- the moving heat source 11 is a creature such as a person or a pet. be.
- the thermal image sensor 1 perceives them as having a high relative temperature in the same way as the heat source.
- the thermal image sensor 1 captures an image of the inside of the space 99 so as to overlook the space 99 .
- step S11 the thermal image sensor 1 estimates the absolute temperature of the reference point S.
- step S12 a position different from the installation position of the temperature sensor 2 is set as a reference point S (reference point setting step).
- step S13 the vertical component of the distance from the installation position of the temperature sensor 2 to the reference point S and the vertical component of the distance from the upper surface 6 to the lower surface 5 are obtained.
- step S ⁇ b>14 a temperature measurement value is obtained from the temperature sensor 2 .
- step S15 the absolute value of the reference point S is calculated from the measured value of the temperature sensor 2, the vertical component of the distance from the installation position of the temperature sensor 2 to the reference point S, the vertical component of the distance from the upper surface 6 to the lower surface 5, and the temperature coefficient.
- Estimate the temperature (reference point temperature estimation step).
- step S16 a correction value is determined from the estimated absolute temperature of the reference point S and the relative temperature of the reference point S measured by the thermal image sensor 1.
- step S17 the relative temperature distribution is acquired from the relative temperature distribution by the thermal image sensor 1 and the correction value (absolute temperature distribution generating step).
- a reference point setting step in which a position different from the position where the temperature sensor 2 that acquires the absolute temperature is installed as the reference point S, a measurement value of the temperature sensor 2, and a distance from the installation position of the temperature sensor 2 to the reference point S
- Absolute temperature distribution generation for determining a correction value from the absolute temperature of the reference point S and the relative temperature of the reference point S by the thermal image sensor 1, and generating the absolute temperature distribution from the relative temperature distribution by the thermal image sensor 1 and the correction value The temperature is measured according to the process.
- the vertical component of the distance from the upper surface 6 to the lower surface 5 is a positive numerical value H regardless of whether the position of the reference point S is on the floor or the ceiling.
- the vertical component of the distance from the installation position of the temperature sensor 2 to the reference point S is positive when the reference point S is below the temperature sensor 2 and negative when the reference point S is above the temperature sensor 2 .
- the temperature difference between the ceiling surface and the floor surface when meeting the standards of ZEH can be used as the heat insulation coefficient D.
- ZEH Network Zero Energy House by Ministry of Economy, Trade and Industry and Ministry of the Environment
- heat insulation coefficient D is 3.0°C or less.
- the adiabatic coefficient D is 3.0° C.
- the temperature change per height is D/H, so the temperature coefficient is (adiabatic coefficient)/(vertical component of the distance from the upper surface 6 to the lower surface 5).
- the adiabatic coefficient D may be input in advance to the storage unit or the like of the temperature measuring device 100 .
- a table of adiabatic coefficients D may be prepared and selected according to the conditions of the space 99 .
- the reference point S may be at a position different from the installation position of the temperature sensor 2, and the reference point S may be provided on the ceiling. If the reference point S is above the temperature sensor 2, then a negative value H1 will be entered into equation (1).
- the relative temperature of the reference point S is set as the reference point temperature calculated by the reference point temperature estimation unit 3, and the correction value is, for example, the reference point temperature and the thermal image sensor 1 is determined as the temperature difference from the relative temperature of the reference point S by
- the absolute temperature of each position different from the reference point S is calculated by adding, for example, a correction value to the relative temperature obtained by the thermal image sensor 1, and the absolute temperature distribution of the entire area captured by the thermal image sensor 1 is obtained as the absolute temperature of each position. to generate A relative temperature distribution for some areas may be generated. In this way, if there is an object to be measured within the space 99, the absolute temperature of the object to be measured can be known from the generated absolute temperature distribution.
- the absolute temperature may be calculated by subtracting the correction value from the relative temperature obtained by the thermal image sensor 1 . If the numerical value acquired by the thermal image sensor 1 is not converted to temperature, the correction value may be determined so as to convert the numerical value to temperature.
- the correction value need not be a constant. For example, a function such as a formula weighted in the space 99 may be used.
- the temperature measurement device 100 can measure the absolute temperature of the object to be measured in a non-contact manner without installing a heavy object such as a blackbody furnace or an auxiliary device such as a shutter. . Therefore, the absolute temperature of the object to be measured can be measured in a non-contact manner with a simple configuration without being restricted by the installation location.
- the temperature measuring device 100 may be provided with a distance measuring section, a reference point setting section, and the like (not shown). Also, an example in which the entire temperature measuring device 100 is installed in the space 99 has been described, but a part of the temperature measuring device 100 may be outside the space 99 as long as at least the temperature sensor 2 is in the space 99. .
- step S14 of measuring the temperature by the temperature sensor 2 is performed before the step S15 of estimating the absolute temperature of the reference point S, for example, it is performed after the step S12 of determining the position of the reference point S. Equal order may be changed. In other words, temperature measurement by the temperature sensor 2 may be performed before the reference point temperature estimation step.
- Embodiment 2 A temperature measuring device according to Embodiment 2 will be described with reference to FIGS. 6 and 7.
- FIG. 6 A temperature measuring device according to Embodiment 2 will be described with reference to FIGS. 6 and 7.
- the temperature measuring device 100 includes a thermal image sensor 1 such as an infrared camera that acquires relative temperature, and a temperature sensor 2 that acquires absolute temperature using a thermocouple or the like.
- a reference point temperature estimation unit 3 an absolute temperature distribution generation unit 4, a spatial temperature difference data acquisition unit 21, and a spatial temperature difference data determination unit 22 are provided.
- the temperature measurement device 100 of the present embodiment is the same as the temperature measurement device 100 of the first embodiment, further provided with a spatial temperature difference data acquisition unit 21 and a spatial temperature difference data determination unit 22. The configuration is the same.
- FIG. 7 is a flow chart showing the procedure for determining the temperature coefficient. It is performed between step S12 and step S12 where the reference point S is set at a position different from the position where the reference point S is. A procedure for determining the temperature coefficient will be described with reference to FIG.
- step S21 the relative temperature of the upper surface 6 and the relative temperature of the lower surface 5 are obtained from the relative temperature distribution obtained by the thermal image sensor 1, and the spatial temperature difference, which is the difference between the relative temperature of the upper surface 6 and the relative temperature of the lower surface 5, is calculated. calculate. Then, in step S22, it is determined whether or not the spatial temperature difference exceeds a predetermined first threshold value Tth1.
- the first threshold Tth1 is the adiabatic coefficient D according to the ZEH standard shown in Embodiment 1, and when the spatial temperature difference becomes larger than the adiabatic coefficient D, it is determined that the spatial temperature difference exceeds the first threshold Tth1. .
- step S22 If it is determined in step S22 that the spatial temperature difference exceeds the first threshold value Tth1 (Yes), the value obtained by dividing the spatial temperature difference by the vertical component of the distance from the upper surface 6 to the lower surface 5 is taken as the temperature coefficient. do. Then, if it is determined in step S22 that the spatial temperature difference is equal to or less than the first threshold value Tth1 (No), the temperature coefficient is not changed or obtained by the procedure described in the first embodiment.
- the spatial temperature difference data acquiring unit 21 acquires the spatial temperature difference, which is the difference between the relative temperature of the upper surface 6 and the relative temperature of the lower surface 5, from the relative temperature distribution acquired by the thermal image sensor 1 (spatial temperature difference acquiring step ), if the spatial temperature difference exceeds the first threshold value Tth1 in the spatial temperature difference data judging section 22, the value obtained by dividing the spatial temperature difference by the vertical component of the distance from the upper surface 6 to the lower surface 5 is taken as the temperature coefficient. (Spatial temperature difference judgment step).
- the temperature measuring apparatus 100 obtains the temperature change per height from the temperature difference between the upper surface 6 and the lower surface 5 of the space 99 and uses it as a temperature coefficient. It can be estimated more accurately and can produce absolute temperatures more accurately.
- the procedure for determining the temperature coefficient is performed between step S11 of obtaining the relative temperature distribution from the thermal image sensor 1 and step S12 of setting a position different from the position where the temperature sensor 2 is installed as the reference point S.
- the order may be changed, for example, after step S ⁇ b>14 of acquiring the temperature measurement value from the temperature sensor 2 .
- the procedure for determining the temperature coefficient should be performed before the reference point temperature estimation step.
- Embodiment 3 A temperature measuring device according to Embodiment 3 will be described with reference to FIGS. 8 and 9. FIG.
- the temperature measurement device 100 includes a thermal image sensor 1 such as an infrared camera that acquires relative temperature, and a temperature sensor 2 that acquires absolute temperature using a thermocouple or the like.
- a reference point temperature estimating unit 3 an absolute temperature distribution generating unit 4, a relative temperature distribution accumulating unit 31, and a reference point changing unit 32 are provided.
- the temperature measuring device 100 of the present embodiment is the same as the temperature measuring device 100 of the first embodiment, except that a relative temperature distribution storage unit 31 and a reference point changing unit 32 are further provided. is.
- FIG. 9 is a flow chart showing the procedure for determining the reference point. It is performed between step S12 and step S12 where the reference point S is set at a position different from the position where the reference point S is.
- a procedure for determining the reference point S will be described with reference to FIG.
- step S31 the relative temperature distribution acquired by the thermal image sensor 1 is accumulated in the relative temperature distribution accumulation unit 31 for a predetermined time interval ⁇ t.
- step S32 it is determined whether or not the relative temperature difference between the time t and the time (t+ ⁇ t) exceeds a predetermined second threshold Tth2, and the range exceeding the second threshold Tth2 is specified. For example, when the second threshold Tth2 is 5° C.
- the relative temperature difference between time t and time (t+ ⁇ t) exceeds 5° C. it is determined that the relative temperature difference exceeds the second threshold Tth2. Coordinates and the like in an image indicating the relative temperature distribution of the image sensor 1 are specified.
- the second threshold Tth2 may be set to a negative value, and determination may be made based on the relationship between the relative temperature difference and the second threshold Tth2. Then, if it is determined in step S32 that the relative temperature difference between the time t and the time (t+ ⁇ t) exceeds the second threshold Tth2 (Yes), in step S33, the range exceeding the second threshold Tth2 is the reference point. Determine if it is set to S.
- step S34 the position in the space 99 excluding the range exceeding the second threshold Tth2 is a reference point S. For example, it is determined whether the coordinates in the image specified in step S32 match the reference point S, or whether the reference point S exists within the specified range. exists, the X, Y coordinates of the reference point S are shifted by .DELTA.x, .DELTA.y, and the routine is repeated until coordinates outside the specified range are found to move the reference point S.
- step S32 if it is determined that the relative temperature difference between the time t and the time (t+ ⁇ t) does not exceed the second threshold Tth2 (No), and in step S33, the range exceeding the second threshold Tth2 is the reference. If it is determined that the reference point S has not been set as a point (No), the process proceeds to step 12 described in the first embodiment without moving the reference point S. That is, the relative temperature distribution accumulating unit 31 accumulates the relative temperature distribution acquired by the thermal image sensor 1 for a predetermined time interval ⁇ t (relative temperature distribution accumulating step), and the reference point changing unit 32 accumulates the relative temperature distribution.
- the temperature measuring device 100 excludes the position where the relative temperature difference is large from the reference point S, so that the absolute temperature of the reference point S can be estimated more accurately. can be generated.
- the timing for inputting/outputting data may be any timing
- the temperature measuring device 100 is provided with a timing control section for controlling the timing for the thermal image sensor 1 to acquire the relative temperature distribution.
- a timing control section for controlling the timing for the thermal image sensor 1 to acquire the relative temperature distribution.
- the temperature measurement device 100 of the present disclosure is not restricted by the installation location and can measure the absolute temperature of the object to be measured in a non-contact manner with a simple configuration.
- a device control unit 40 for controlling the device 1000 is provided to enable advanced control of various electrical devices 1000 .
- an air conditioner may be provided with a temperature measuring device 100 to detect a range below the set temperature of the air conditioner from the absolute temperature distribution of the space 99 in the room, and control the heating function of the air conditioner. A range in which the set temperature of the air conditioner is exceeded may be detected to control the cooling function. Further, based on the generated absolute temperature distribution, the strength and temperature of the wind hitting the object to be measured may be controlled.
- the temperature measuring device 100 may be provided in a driver monitoring system that monitors drivers of vehicles such as automobiles, trains, airplanes, and ships.
- the temperature measuring device 100 is installed on the dashboard of an automobile, the body surface temperature of the driver is detected from the absolute temperature distribution, and if it exceeds or falls below a predetermined threshold, a warning is issued or the brake is controlled.
- the functions of the electric device 1000 can be highly controlled based on the absolute temperature selected from the absolute temperature distribution generated by the absolute temperature distribution generation unit 4. can be done.
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Abstract
Description
図1~図5を用いて実施の形態1における温度測定装置について説明する。
ステップS11において、熱画像センサ1に基準点Sの絶対温度を推定 する。そして、ステップS12において、温度センサ2の設置位置と異なる位置を基準点Sとする(基準点設定工程)。そして、ステップS13において、温度センサ2の設置位置から基準点Sまでの距離の鉛直成分と上面6から下面5までの距離の鉛直成分を取得する。そして、ステップS14において、温度センサ2から温度の計測値を取得する。そして、ステップS15において、温度センサ2の計測値、温度センサ2の設置位置から基準点Sまでの距離の鉛直成分、上面6から下面5までの距離の鉛直成分、温度係数から基準点Sの絶対温度を推定 する(基準点温度推定工程)。そして、ステップS16において、推定された基準点Sの絶対温度と熱画像センサ1による基準点Sの相対温度とから補正値を決定 する。そして、ステップS17において、熱画像センサ1による相対温度分布と補正値から相対温度分布を取得 する(絶対温度分布生成工程)。
断熱係数Dは、温度測定装置100の記憶部等に予め入力しておけばよい。断熱係数Dのテーブルを作成し、空間99の条件により選択するようにしてもよい。
通常、床から天井までの温度分布はほぼ一様である。この特性を利用して、基準点Sの絶対温度を推定する。温度センサ2の測定値をTmとしたとき、基準点Sの絶対温度Tsは、次式(1)で求まる。
Ts=Tm-(D/H)×H1 (1)
熱画像センサ1から入力された相対温度分布のうち、基準点Sの相対温度を基準点温度推定部3が算出した基準点温度とするとともに、補正値を、例えば基準点温度と熱画像センサ1による基準点Sの相対温度との温度差と決定する。基準点Sと異なる各位置の絶対温度は、熱画像センサ1による相対温度に補正値を例えば加算して算出し、各位置の絶対温度として、熱画像センサ1が撮像したエリア全体の絶対温度分布を生成する。一部のエリアの相対温度分布を生成してもよい。このようにして、空間99内に測定対象物があれば、生成された絶対温度分布から測定対象物の絶対温度を知ることができる。
熱画像センサ1が取得する数値が温度換算されていない場合は、その数値を温度換算するように補正値を決めてもよい。補正値は定数でなくてもよい。例えば空間99内に重みづけをした式等の関数を用いたものであってもよい。
また、温度測定装置100の全体を空間99内に設置する例について説明したが、少なくとも温度センサ2が空間内99にあれば、温度測定装置100の一部が空間99の外にあってもよい。
図6、図7を用いて実施の形態2における温度測定装置について説明する。
図8、図9を用いて実施の形態3における温度測定装置について説明する。
ステップS31において、熱画像センサ1が取得した相対温度分布を、予め定められた時間間隔Δtの間、相対温度分布蓄積部31に蓄積する。そして、ステップS32において時刻tと時刻(t+Δt)の相対温度差が、予め定められた第二の閾値Tth2を超えるか否か判断し、第二の閾値Tth2を超える範囲を特定する。
例えば、第二の閾値Tth2を5℃とし、時刻tと時刻(t+Δt)の相対温度差が5℃より大きくなると、相対温度差が第二の閾値Tth2を超えていると判断するとともに、例えば熱画像センサ1の相対温度分布を示す画像中の座標等を特定する。第二の閾値Tth2を負の値とし、相対温度差と第二の閾値Tth2との関係に基づき判断してもよい。
そして、ステップS32で時刻tと時刻(t+Δt)の相対温度差が第二の閾値Tth2を超えている(Yes)と判断された場合、ステップS33において、第二の閾値Tth2を超える範囲が基準点Sとされているか判断する。そして、ステップS33で第二の閾値Tth2を超える範囲が基準点Sとされている(Yes)と判断された場合、ステップS34において、第二の閾値Tth2を超える範囲を除いた空間99内の位置を基準点Sとする。例えば、ステップS32で特定された画像中の座標が基準点Sと一致するか、特定された範囲内に基準点Sが存在するかを判断し、一致または、特定された範囲内に基準点Sが存在すると判断された場合、基準点SのX、Y座標を、Δx、Δyだけずらし、特定された範囲外の座標が見つかるまでこのルーチンを繰り返し、基準点Sを移動させる。
そして、ステップS32において、時刻tと時刻(t+Δt)の相対温度差が第二の閾値Tth2を超えない(No)と判断された場合、及びステップS33において、第二の閾値Tth2を超える範囲が基準点とされていない(No)と判断された場合は、基準点Sを移動させることなく、実施の形態1で説明したステップ12に進む。
すなわち、相対温度分布蓄積部31において、熱画像センサ1が取得した相対温度分布を予め定められた時間間隔Δt分蓄積し(相対温度分布蓄積工程)、基準点変更部32において、相対温度分布蓄積部31に蓄積された相対温度分布のうち、時間間隔Δt内の温度差が第二の閾値Tth2を超える範囲が特定され、かつ第二の閾値Tth2を超える範囲が基準点Sとされた場合は、第二の閾値Tth2を超える範囲を除いた空間99内の位置を基準点Sとする(基準点変更工程)。
また、上面6、下面5を平面である天井、床とする例について説明したが、上面6、下面5は、曲面であってもよい。
例えば、空調機に温度測定装置100を設け、室内における空間99の絶対温度分布から空調機の設定温度に満たない範囲を検知し、空調機の暖房機能を制御できる。空調機の設定温度を超過する範囲を検知し、冷房機能を制御してもよい。また、生成された絶対温度分布に基づき、測定対象物にあたる風の強さや温度を制御してもよい。
Claims (9)
- 上面、下面を有する空間において温度を測定する温度測定装置であって、
前記空間内の相対温度を取得する熱画像センサと絶対温度を取得する温度センサとを備え、前記空間内の前記温度センサが設置された位置と異なる位置を基準点とし、
前記温度センサの測定値と、前記温度センサの設置位置から前記基準点までの距離の鉛直成分と、前記上面から前記下面までの距離の鉛直成分と、前記空間の温度係数とから、前記基準点の絶対温度を推定する基準点温度推定部と、
前記基準点温度推定部により推定された前記基準点の絶対温度と前記熱画像センサによる前記基準点の相対温度とから補正値を決定し、前記熱画像センサによる相対温度分布と前記補正値とから絶対温度分布を生成する絶対温度分布生成部と、
を備えたことを特徴とする温度測定装置。 - 前記基準点は、前記上面又は前記下面上とすることを特徴とする請求項1に記載の温度測定装置。
- 前記温度係数は、前記空間における高さあたりの温度変化であることを特徴とする請求項1に記載の温度測定装置。
- 前記温度係数は、断熱係数D、前記上面から前記下面までの高さをHとしたとき、D/Hであって、前記基準点の絶対温度Tsは、前記温度センサの計測値をTm、前記下面から前記温度センサまでの高さをH1としたとき、
Ts=Tm-(D/H)×H1 (1)
で求められることを特徴とする請求項1に記載の温度測定装置。 - 前記補正値は、前記基準点温度推定部で推定された前記基準点の絶対温度と、前記熱画像センサから取得された前記相対温度分布のうちの、前記基準点の相対温度との温度差とし、
前記熱画像センサから取得された前記相対温度分布のうち、前記基準点の相対温度を、推定された前記基準点の絶対温度に置き換えるとともに、前記基準点と異なる位置の相対温度を、前記基準点と異なる位置の相対温度に前記補正値を加算、又は減算して、前記絶対温度分布を生成することを特徴とする請求項1に記載の温度測定装置。
- 前記熱画像センサが取得した相対温度分布から、前記上面の相対温度と前記下面の相対温度の差である空間温度差を取得する空間温度差データ取得部をさらに備え、
前記空間温度差が第一の閾値を超えた場合は、
前記空間温度差を前記上面から前記下面までの距離の鉛直成分で除した値を前記温度係数とする空間温度差データ判断部を備えたことを特徴とする請求項1に記載の温度測定装置。 - 前記熱画像センサが取得した相対温度分布を蓄積する相対温度分布蓄積部をさらに備え、
前記相対温度分布蓄積部に蓄積された前記相対温度分布のうち、時間間隔内の温度差が第二の閾値を超える範囲が特定され、かつ前記第二の閾値を超える範囲が基準点とされた場合は、前記第二の閾値を超える範囲と異なる前記空間内の位置を、前記基準点とする基準点変更部を備えたことを特徴とする請求項1に記載の温度測定装置。 - 上面、下面を有する空間において温度を測定する温度測定方法であって、
絶対温度を取得する温度センサが設置された位置と異なる位置を基準点とする基準点設定工程と、
前記温度センサの測定値と、前記温度センサの設置位置から前記基準点までの距離の鉛直成分と、前記上面から前記下面までの距離の鉛直成分と、前記空間の温度係数とから、前記基準点の絶対温度を推定する基準点温度推定工程と、
前記基準点温度推定工程により推定された前記基準点の絶対温度と前記空間内の相対温度を取得する熱画像センサによる前記基準点の相対温度とから補正値を決定し、前記熱画像センサによる相対温度分布と前記補正値から絶対温度分布を生成する絶対温度分布生成工程と、
を備えたことを特徴とする温度測定方法。 - 請求項1から請求項7のいずれかに記載の温度測定装置と、
前記温度測定装置の前記絶対温度分布生成部が生成した絶対温度分布から選択した絶対温度に基づき、機能を制御することを特徴とする電気機器。
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