JP2021043103A - Infrared measurement system - Google Patents

Abstract

To provide an infrared measurement system that facilitates management of the temperature inside a thermostatic bath.SOLUTION: An infrared measurement system comprises: a thermostatic bath 20 including an adiabatic wall that reduces transfer of heat between an exterior space and an interior space, a measurement window 21 that is provided with a lens 31 for condensing infrared rays emitted from an object located in the exterior space to a condensation position in the interior space, a holding part that holds an infrared incident part of an infrared sensor at the condensation position, and a temperature control part that controls the temperature of the interior space to a predetermined temperature; a heat source 40 that is provided in the exterior space and emits infrared rays to the measurement window; and the infrared sensor 10 that is held by the holding part in the interior space and detects the amount of energy of the infrared rays emitted from the heat source and condensed by the lens.SELECTED DRAWING: Figure 3

Description

The present invention relates to an infrared measurement system.

Conventionally, there has been a problem that the thermal energy of the optical system itself provided in the infrared measuring device affects the measurement result. As a technique for solving this problem, an environmental temperature correction technique for measuring the amount of thermal energy of the optical system itself and correcting the amount of infrared rays measured by an infrared sensor is known. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 9-53993

In the environmental temperature correction technology based on the conventional technique, the amount of heat energy radiated from the blackbody furnace is measured while the ambient temperature of the infrared sensor is controlled to a predetermined temperature. When the infrared sensor is placed in the internal space of the constant temperature bath and the blackbody furnace is placed in the external space of the constant temperature bath, the blackbody furnace provided in the external space of the constant temperature bath radiates from the internal space of the constant temperature bath. In order to detect the amount of infrared energy to be emitted, it is conceivable to provide an infrared transmitting portion having a size based on the angle of view of the infrared sensor. However, by providing the infrared transmitting portion having a size based on the angle of view of the infrared sensor, there is a problem that the heat inside the constant temperature bath is radiated to the outside.

That is, according to the conventional method, there is a problem that it is not easy to control the temperature in the constant temperature bath when the temperature is measured in a state where the environmental temperature of the infrared sensor is controlled to a desired temperature.

The present invention has been made in view of such a situation, and an object of the present invention is to provide an infrared measurement system in which temperature control in a constant temperature bath is easy.

In the infrared measurement system according to one aspect of the present invention, a heat insulating wall that reduces heat transfer between the external space and the internal space and infrared rays radiated from an object located in the external space are collected in the internal space. It includes a measurement window provided with a lens that collects light at a position, a holding unit that holds an infrared incident portion of an infrared sensor at the focusing position, and a temperature control unit that controls the temperature of the internal space to a predetermined temperature. A constant temperature bath, a heat source provided in the external space and radiating infrared rays to the measurement window, and an amount of infrared energy emitted from the heat source held in the holding portion of the internal space and collected by the lens. It is equipped with an infrared sensor for detecting.

Further, in the infrared measurement system according to one aspect of the present invention, the heat source is a blackbody furnace.

Further, in the infrared measurement system according to one aspect of the present invention, the lens is an internal visual field space which is the internal space of the constant temperature bath and is included in the angle of view of the infrared sensor, and the constant temperature bath. It is located between the external visual field space, which is an external space and is a space included in the angle of view of the infrared sensor.

Further, in the infrared measurement system according to one aspect of the present invention, the lens is a convex meniscus type lens, and at least a part of the internal visual field space is located between the outer shape of the constant temperature bath and the lens.

Further, in the infrared measurement system according to one aspect of the present invention, the lens is a plano-convex lens whose surface on the internal visual field space side is a flat surface.

According to the present invention, it is possible to provide an infrared measurement system in which temperature control in a constant temperature bath is easy.

It is a figure which shows an example of the infrared measurement system in an embodiment. It is a figure which shows an example of the constant temperature bath in an embodiment. It is a figure which shows an example of the case where the plano-convex lens in an embodiment is used. It is a figure which shows an example of the case where the convex meniscus type lens in an embodiment is used. It is a figure which shows the method which the infrared sensor arranged in the constant temperature bath detects the infrared ray radiated by the heat source to measure in the prior art. It is a figure which shows the method of detecting the infrared ray radiated by the heat source to measure in the prior art from a plurality of positions by an infrared sensor arranged in a constant temperature bath.

Hereinafter, the prior art will be described.
[Conventional technology]
According to the prior art, when measuring the output of an infrared sensor under a predetermined temperature environment, the infrared sensor is placed in the internal space of a temperature-controllable constant temperature bath, and the blackbody furnace is placed in the external space of the constant temperature bath. It was. The infrared sensor detects the amount of infrared energy emitted by the blackbody furnace provided in the external space of the constant temperature bath from the internal space of the constant temperature bath. The infrared sensor installed in the internal space of the constant temperature bath detects the amount of infrared energy emitted by the blackbody furnace installed in the external space of the constant temperature bath, so the wall of the constant temperature bath is based on the angle of view of the infrared sensor. In some cases, it was provided with an infrared transmitting part of a large size.

FIG. 5 is a diagram showing a method in which an infrared sensor detects infrared rays radiated by a heat source to be measured in a constant temperature bath in the prior art.
In the prior art, the infrared sensor 90 is provided in the internal space of the constant temperature bath 91. The heat source 95 to be measured is provided in the external space of the constant temperature bath 91. The infrared sensor 90 detects the amount of infrared energy emitted by the heat source 95 to be measured provided in the external space of the constant temperature bath 91. Therefore, it is conceivable to arrange the infrared transmitting member 93 having a high infrared transmittance in the opening hole 92.
The infrared sensor 90 detects the amount of infrared energy radiated by the heat source 95 to be measured through the infrared transmitting member 93. Therefore, the opening hole and the infrared transmitting member 93 must be enlarged according to the angle of view of the infrared sensor 90.
Therefore, the larger the opening hole and the infrared transmitting member 93, the more infrared rays are radiated from the internal space of the constant temperature bath 91 to the external space.

FIG. 6 is a diagram showing a method in which an infrared sensor detects infrared rays radiated by a heat source to be measured from a plurality of positions in a constant temperature bath in the prior art.
For example, when the angle of view of the infrared sensor 90 exceeds the size of the infrared transmitting member 93, the sensors are arranged at a plurality of positions having different optical axes, and measurement results are obtained from the respective arrangement positions. Therefore, it is conceivable to measure the entire angle of view of the infrared sensor.
When the angle of view of the infrared sensor 90 is wider than that of the infrared transmitting member 93, the infrared sensor 90 is moved to a plurality of positions and measurement is performed from each position in order to measure all the angles of view in a plurality of times. .. In this case, it is necessary to use the heat source 95 to be measured, which has a size corresponding to the angle of view of the infrared sensor 90.
As another method, it is conceivable to perform the measurement a plurality of times while changing the angle at which the sensor faces, but the measurement must be performed a plurality of times, which takes a long time. Further, it is necessary to use the heat source 95 to be measured, which has a size corresponding to the angle of view of the infrared sensor 90.

Hereinafter, the present embodiment will be described.
[About this embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Overview of infrared measurement system 100]
FIG. 1 is a diagram showing an example of an infrared measurement system 100 according to an embodiment.
The infrared measurement system 100 includes an infrared sensor 10, a constant temperature bath 20, and a heat source 40 to be measured. In the infrared measurement system 100, the infrared sensor 10 is provided in the internal space of the constant temperature bath 20. The infrared sensor 10 detects the amount of infrared energy radiated from the measurement target heat source 40 provided in the external space of the constant temperature bath 20.
In the following description, the directions of the infrared sensor 10, the constant temperature bath 20, and the heat source 40 to be measured may be indicated by the three-dimensional orthogonal coordinate system (xyz-axis coordinate system) of the x-axis, y-axis, and z-axis.

The infrared sensor 10 is, for example, an array type infrared sensor. The infrared sensor 10 includes a plurality of pixels arranged in an array in a pixel array plane (not shown). Here, arranging in an array means that the infrared detection elements are arranged at equal intervals in the y-axis direction and the z-axis direction, for example. The pixel array surface in which a plurality of pixels are arranged is arranged perpendicular to the x-axis. Each of the plurality of pixels is an infrared detection element. That is, the infrared sensor 10 is an infrared sensor in which a plurality of infrared detection elements are arranged in an array.
In the present embodiment, the infrared sensor 10 includes an infrared sensor window portion 11. The infrared sensor 10 detects the amount of infrared energy radiated by the heat source 40 to be measured through the infrared sensor window 11. That is, the infrared sensor window portion 11 is an infrared incident portion of the infrared sensor 10.

In the present embodiment, the infrared sensor 10 outputs the detected infrared energy amount as a voltage value.
The infrared sensor 10 may include a signal conversion IC such as a CPU or an analog-digital converter (not shown). The infrared sensor 10 may convert the detected infrared energy amount into digital data such as a serial communication signal or a parallel communication signal and output it. The digital data output by the infrared sensor 10 may be output by a wired connection or an output by a wireless connection.

The constant temperature bath 20 includes a heat insulating wall that reduces heat transfer between the external space and the internal space. In the present embodiment, the constant temperature bath 20 is a rectangular parallelepiped having heat insulating walls on six sides. The constant temperature bath 20 includes a temperature control unit (not shown), and the temperature control unit controls the temperature of the internal space to a predetermined temperature. The infrared measurement system 100 controls the internal space of the constant temperature bath 20 to a predetermined temperature by a temperature control unit, thereby performing an environmental test (reliability evaluation test, etc.) in a predetermined temperature environment such as a low temperature environment or a high temperature environment. ) Is possible.

As shown in FIG. 2, the constant temperature bath 20 has an opening hole 21 on one surface of the heat insulating wall. Hereinafter, the opening hole 21 may also be referred to as a measurement window. Since the constant temperature bath 20 has an opening hole 21, the internal space of the constant temperature bath 20 and the external space of the constant temperature bath 20 are combined, and substances can be exchanged between the internal space and the external space.

Returning to FIG. 1, the lens 30 will be described. In the present embodiment, the constant temperature bath 20 includes a lens 30 in the opening hole 21.
The lens 30 is composed of a member having a high infrared transmittance. The member having high infrared transmittance is calcium fluoride, barium fluoride, zinc sulfide and the like.
The lens 30 collects infrared rays radiated from an object located in the external space of the constant temperature bath 20 at the light collecting position SP in the internal space of the constant temperature bath 20. That is, the lens 30 is a convex lens having a positive power.
The internal space of the constant temperature bath 20 is provided with a holding portion 12 for holding the infrared sensor 10 so that the infrared incident portion of the infrared sensor 10 is located at the condensing position SP of the lens 30. The infrared sensor 10 is held in the internal space of the constant temperature bath 20 by the holding portion 12 included in the constant temperature bath 20, and detects the amount of infrared energy emitted from the measurement target heat source 40 that the lens 30 collects.

The heat source 40 to be measured is a heat source provided in the external space of the constant temperature bath 20 and radiating infrared rays to the measurement window. The heat source 40 to be measured is installed at a distance L so as to face the surface of the constant temperature bath 20 provided with the lens 30.
As an example, the heat source 40 to be measured is a blackbody furnace. In the present embodiment, the heat source 40 to be measured will be described as a flat blackbody furnace.

The blackbody radiates infrared rays in an amount of infrared rays corresponding to the temperature of the blackbody itself, and is maintained at a preset temperature. In a blackbody furnace, it is possible to measure the temperature without being affected by noise.
A flat blackbody furnace is a blackbody furnace having a flat blackbody surface.
In addition to the flat blackbody furnace, the blackbody furnace also includes a cavity type blackbody furnace having a spherical blackbody surface. In the present embodiment, the case where the heat source 40 to be measured is a flat blackbody furnace will be described.

The heat source 40 to be measured includes a radiation surface OP, which is a surface observed by the infrared sensor 10.
The height H and width W of the radiation surface OP included in the heat source 40 to be measured are determined by the sensor angle of view SA of the infrared sensor 10, the refractive index of the lens 30, and the distance L.

[Example of an Embodiment when a plano-convex lens is used]
FIG. 3 is a diagram showing an example when the plano-convex lens in the embodiment is used.
The infrared measurement system 101 includes an infrared sensor 10, a constant temperature bath 20, and a heat source 40 to be measured. In the present embodiment, the constant temperature bath 20 includes a plano-convex lens 31 in the opening hole 21. The infrared measurement system 101 in FIG. 3 is the xy plane in FIG.

The plano-convex lens 31 includes a heat source side lens surface 32 and a sensor side lens surface 33. The plano-convex lens 31 is a lens having a positive power because the heat source side lens surface 32 is a convex curved surface and the sensor side lens surface 33 is a flat surface.
The heat source side lens surface 32 is the surface on which the plano-convex lens 31 faces the external space of the constant temperature bath 20, and the sensor side lens surface 33 is the surface on which the plano-convex lens 31 faces the internal space of the constant temperature bath 20. The side surface.
The plano-convex lens 31 is an example of the lens 30.

The internal visual field space AR1 is an internal space of the constant temperature bath 20 and is a space included in the sensor angle of view SA of the infrared sensor 10.
The extended external visual field space AR2 is an external space of the constant temperature bath 20, and is a space included in the sensor angle of view SA of the infrared sensor 10 when refraction by the plano-convex lens 31 is not taken into consideration.
The external visual field space AR3 is an external space of the constant temperature bath 20, and is a space included in the sensor angle of view SA of the infrared sensor 10 when refraction by the plano-convex lens 31 is taken into consideration. The external visual field space AR3 is included in the extended external visual field space AR2.
The plano-convex lens 31 is located between the internal visual field space AR1 and the external visual field space AR3. That is, the plano-convex lens 31 is an internal visual field space AR1 which is an internal space of the constant temperature bath 20 and is a space included in the sensor angle of view SA of the infrared sensor 10, and an external space of the constant temperature bath 20 and the infrared sensor 10. It is located between the external viewing space AR3, which is a space included in the sensor angle of view SA of.
In the plano-convex lens 31, the sensor-side lens surface 33, which is the surface on the internal visual field space side, is a flat surface.

The heat source 40 to be measured is located in the external space of the constant temperature bath 20, and is installed at a position L away from the constant temperature bath 20. In the present embodiment, the heat source 40 to be measured is a flat blackbody furnace.
The infrared rays emitted by the radiation surface OP of the heat source 40 to be measured are focused on the focusing position SP by the plano-convex lens 31. The infrared rays collected by the plano-convex lens 31 enter the infrared sensor window portion 11 of the infrared sensor 10. The infrared sensor 10 detects the amount of infrared energy emitted by the heat source 40 to be measured.

The heat source width W2 is the width of the heat source 40 to be measured in the present embodiment in the y-axis direction. The infrared rays radiated from the heat source 40 to be measured are refracted by the plano-convex lens 31 and incident on the infrared sensor window portion 11 of the infrared sensor 10. The minimum value of the heat source width W2 is determined by the distance L, the sensor angle of view SA, and the refractive index of the plano-convex lens 31.

The heat source width W1 is the width of the heat source 40 to be measured in the y-axis direction when the constant temperature bath 20 does not include the plano-convex lens 31. The infrared sensor 10 having a sensor angle of view SA can detect the width of the heat source width W1 on the radiation surface OP of the heat source 40 to be measured when refraction by the plano-convex lens 31 is not taken into consideration. Therefore, the minimum value of the heat source width W1 is determined by the distance L and the sensor angle of view SA.

Here, the heat source width W2 is smaller than the heat source width W1. Therefore, in the present embodiment, the infrared measurement system 101 can use a measurement target heat source that is smaller than the size of the measurement target heat source when the plano-convex lens 31 is not provided.

[Example of an Embodiment when a convex meniscus type lens is used]
FIG. 4 is a diagram showing an example when the convex meniscus type lens in the embodiment is used.
The infrared measurement system 102 includes an infrared sensor 10, a constant temperature bath 20, and a heat source 40 to be measured. In the present embodiment, the constant temperature bath 20 includes a convex meniscus type lens 35 in the opening hole 21. The infrared measurement system 102 in FIG. 4 is the xy plane in FIG.

The convex meniscus type lens 35 includes a heat source side lens surface 36 and a sensor side lens surface 37. The convex meniscus type lens 35 is a lens having a positive power because both the heat source side lens surface 36 and the sensor side lens surface 37 are formed of curved surfaces.
The heat source side lens surface 36 is on the external space side of the convex meniscus type lens 35, and the sensor side lens surface 33 is on the internal space side of the convex meniscus type lens 35.
The convex meniscus type lens 35 is an example of the lens 30.

The internal visual field space AR1 is an internal space of the constant temperature bath 20 and is a space included in the sensor angle of view SA of the infrared sensor 10.
The extended external visual field space AR2 is an external space of the constant temperature bath 20, and is a space included in the sensor angle of view SA of the infrared sensor 10 when refraction by the convex meniscus type lens 35 is not taken into consideration.
The external visual field space AR3 is an external space of the constant temperature bath 20, and is a space included in the sensor angle of view SA of the infrared sensor 10 when refraction by the convex meniscus type lens 35 is taken into consideration. The external visual field space AR3 is included in the extended external visual field space AR2.
The convex meniscus lens 35 is located between the internal visual field space AR1 and the external visual field space AR3. In the present embodiment, at least a part of the internal visual field space AR1 is located between the outer shape of the constant temperature bath 20 and the convex meniscus type lens 35.

The heat source 40 to be measured is located in the external space of the constant temperature bath 20, and is installed at a position L away from the constant temperature bath 20. In the present embodiment, the heat source 40 to be measured is a flat blackbody furnace.
The infrared rays emitted by the heat source 40 to be measured are focused on the focusing position SP by the convex meniscus type lens 35. The infrared rays collected by the convex meniscus type lens 35 are incident on the infrared sensor window portion 11 of the infrared sensor 10. The infrared sensor 10 detects the amount of infrared energy emitted by the heat source 40 to be measured.

The heat source width W3 is the width of the heat source 40 to be measured in the present embodiment in the y-axis direction. The infrared rays radiated from the heat source 40 to be measured are refracted by the convex meniscus type lens 35 and incident on the infrared sensor window portion 11 of the infrared sensor 10. The minimum value of the heat source width W3 is determined by the distance L, the sensor angle of view SA, and the refractive index of the convex meniscus type lens 35.

The heat source width W1 is the width of the heat source 40 to be measured in the y-axis direction when the constant temperature bath 20 does not include the convex meniscus type lens 35. The infrared sensor 10 having a sensor angle of view SA can detect the width of the heat source width W1 on the radiation surface OP of the heat source 40 to be measured when refraction by the convex meniscus type lens 35 is not taken into consideration. Therefore, the minimum value of the heat source width W1 is determined by the distance L and the sensor angle of view SA.

Here, the heat source width W3 is smaller than the heat source width W1. Therefore, in the present embodiment, the infrared measurement system 102 can use a measurement target heat source smaller than the size of the measurement target heat source when the convex meniscus type lens 35 is not provided.

[Summary of effects of embodiments]
As described above, the infrared measurement system 100 of the present embodiment includes a constant temperature bath 20, a heat source 40 to be measured, and an infrared sensor 10. The constant temperature bath 20 includes a lens 30 in the opening hole 21. The lens 30 collects infrared rays radiated by a heat source arranged in the external space into the internal space of the constant temperature bath 20. The infrared sensor 10 detects the amount of infrared energy collected by the lens 30. The constant temperature bath 20 can make the opening hole 21 smaller by providing the lens 30 in the opening hole 21. That is, the constant temperature bath 20 can suppress the release of heat from the internal space to the external space by making the opening hole 21 small.
Therefore, in the present embodiment, it is possible to provide an infrared measurement system in which the temperature inside the constant temperature bath can be easily controlled.

Further, in the temperature measurement using the method by the prior art, the infrared sensor and the target heat source are arranged in the internal space of the constant temperature bath in order to measure the temperature of the target heat source while the environmental temperature of the infrared sensor is controlled to a predetermined temperature. It is also conceivable to measure in a state. In that case, it was necessary to prepare a constant temperature bath large enough to accommodate the infrared sensor and the heat source to be measured. When both the infrared sensor and the target heat source are arranged in the internal space of the constant temperature bath, a large constant temperature bath must be used, which requires labor and cost to prepare a large constant temperature bath.
According to the present invention, the heat source 40 to be measured is arranged in the external space of the constant temperature bath 20. Compared with the case where the heat source 40 to be measured is arranged in the internal space of the constant temperature bath 20, the constant temperature bath 20 can be made smaller. Therefore, according to the present invention, there is no need for labor and cost to prepare a large constant temperature bath.

Further, in the temperature measurement using the method by the prior art, it is necessary to use a heat source to be measured having a size corresponding to the angle of view of the infrared sensor. For example, when measuring using a wide-angle infrared sensor, a large heat source must be used as the heat source to be measured, depending on the angle of view of the infrared sensor. When the heat source to be measured is smaller than the angle of view of the infrared sensor, the sensors are arranged at a plurality of positions having different optical axes, and the measurement results from the respective arrangement positions are obtained to obtain all the angles of view of the infrared sensor. Was measuring about. Alternatively, the measurement was performed a plurality of times while changing the angle at which the sensor faces.
According to the present embodiment, the lens 30 is a convex lens that collects infrared rays radiated from an object located in the external space to a condensing position in the internal space. Therefore, by condensing the infrared rays emitted by the object by the lens 30, the infrared measuring system 100 in the present embodiment can measure all the angles of view of the infrared sensor 10 with one measurement.
Further, in the infrared measurement system 100 of the present embodiment, the size of the heat source 40 to be measured can be reduced by condensing the infrared rays radiated by the object by the lens 30.

Further, according to the above-described embodiment, the heat source 40 to be measured is a blackbody furnace.
In the present embodiment, the infrared sensor 10 is provided in the internal space of the constant temperature bath 20 capable of controlling the temperature of the internal space to a predetermined temperature, and detects the amount of infrared energy emitted from the heat source 40 to be measured.
Therefore, the infrared measurement system 100 can measure the characteristics of the infrared sensor 10 under a predetermined temperature environment.

Further, according to the above-described embodiment, the lens 30 is located between the internal visual field space AR1 and the external visual field space AR2. Since the lens 30 is located between the internal visual field space AR1 and the external visual field space AR2, a space through which air flows is secured between the lens 30 and the infrared sensor 10. Since a space through which air flows is secured in the internal space of the constant temperature bath 20, air does not stay.
Therefore, since air does not stay in the constant temperature bath 20 in the present embodiment, the temperature can be easily adjusted.

Further, according to the above-described embodiment, the lens 30 is a convex meniscus type lens. The convex meniscus type lens 35 is arranged so that at least a part of the internal visual field space is located between the outer shape of the constant temperature bath 20 and the convex meniscus type lens 35. When the convex meniscus type lens 35 is used, the infrared sensor 10 can be arranged at a position closer to the convex meniscus type lens 35 as compared with the case where the plano-convex type lens 31 is used. Since the infrared sensor 10 can be arranged at a position closer to the convex meniscus type lens 35, a higher refractive index can be obtained.
Therefore, the heat source 40 to be measured can be made smaller.

Further, according to the above-described embodiment, the lens 30 is a plano-convex lens having a flat surface on the internal visual field space side. Compared with the case where the surface of the lens 30 on the internal visual field space side is a convex curved surface, air retention does not occur. Therefore, when a plano-convex lens is used for the lens 30, the temperature can be easily adjusted as compared with the case where the surface of the lens 30 on the internal visual field space side is a convex curved surface.
Further, the plano-convex lens is cheaper than the convex meniscus type lens. Therefore, when a plano-convex lens is used, the infrared measurement system 100 can be constructed at a lower cost than a convex meniscus type lens.

Although the embodiments for carrying out the present invention have been described above using the embodiments, the present invention is not limited to these embodiments, and various modifications and substitutions are made without departing from the spirit of the present invention. Can be added.

100, 101, 102 ... Infrared measurement system, 10 ... Infrared sensor, 11 ... Infrared sensor window, 12 ... Holding, 20 ... Constant temperature bath, 21 ... Open hole, 30 ... Lens, 31 ... Plano-convex lens, 32 ... Heat source side lens surface, 33 ... Sensor side lens surface, 35 ... Convex meniscus type lens, 36 ... Heat source side lens surface, 37 ... Sensor side lens surface, 40 ... Measurement target heat source, SA ... Sensor angle of view, SP ... Condensing position , OP ... Radial surface, W1, W2, W3 ... Heat source width, AR1 ... Internal visual field space, AR2 ... Extended external visual field space, AR3 ... External visual field space

Claims (5)

A measurement window equipped with a heat insulating wall that reduces heat transfer between the external space and the internal space, and a lens that collects infrared rays radiated from an object located in the external space to the condensing position of the internal space. A constant temperature bath including a holding unit that holds the infrared incident portion of the infrared sensor at the condensing position and a temperature control unit that controls the temperature of the internal space to a predetermined temperature.
A heat source provided in the external space and radiating infrared rays to the measurement window,
An infrared sensor that is held in the holding portion of the internal space and detects the amount of infrared energy emitted from the heat source that the lens collects.
Infrared measurement system with. The infrared measurement system according to claim 1, wherein the heat source is a blackbody furnace. The lens is included in the internal visual field space which is the internal space of the constant temperature bath and is included in the angle of view of the infrared sensor, and the external space of the constant temperature bath and is included in the angle of view of the infrared sensor. The infrared measurement system according to claim 1 or 2, which is located between the space and the external visual field space. The lens is a convex meniscus type lens.
The infrared measurement system according to claim 3, wherein at least a part of the internal visual field space is located between the outer shape of the constant temperature bath and the lens. The infrared measurement system according to claim 3, wherein the lens is a plano-convex lens whose surface on the internal visual field space side is a flat surface.

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