JP2022134360A - Infrared sensor temperature control holder - Google Patents

Abstract

[Problem] To provide a temperature control holder for an infrared sensor that can control the environmental temperature of the infrared sensor with high accuracy and stability using temperature-controlled air. [Solution] A temperature control holder 10 for an infrared sensor 1 that houses the infrared sensor 1 when controlling the environmental temperature of the infrared sensor 1 with temperature-controlled air 200. The infrared sensor 1 has a lens 2 that receives infrared rays radiated from a temperature measurement target 100, and a lens barrel 3 that supports the lens 2, and is provided with a ventilation surface 13 for the temperature-controlled air 200 at a position higher than the lens barrel 3, and a wall portion 12 that opens at the ventilation surface 13 larger than the outer shape of the lens barrel 3 and forms a gap S around the lens barrel 3 to guide the temperature-controlled air 200. [Selected Figure] Figure 1

Description

The present invention relates to a temperature control holder for an infrared sensor.

2. Description of the Related Art Conventionally, a temperature detector described in Patent Document 1 below is known. This temperature detector is an infrared sensor, and includes an infrared detecting element that detects infrared rays emitted from a temperature measurement object, and an angle of infrared light that receives infrared rays emitted from the temperature measurement object and enters the infrared detection element. and a lens barrel (referred to as a holder in Patent Document 1) that supports the lens. In the infrared sensor, if the temperature in the vicinity of the infrared detection element becomes unstable, the temperature cannot be detected accurately. An opening is provided, and the environmental temperature of the infrared sensor is controlled by temperature-controlled air flowing in from the ventilation opening.

JP-A-6-307940

However, the ventilation holes of the conventional holder are formed so as to face the side surface of the lens barrel (see FIG. 1 of Patent Document 1). Even if temperature-controlled air is circulated in a constant temperature bath, the temperature of the air is not stable. Therefore, if the temperature-controlled air flowing in from the ventilation port hits the lens barrel directly, it can cause a temperature detection error in the infrared detection element. For this reason, the above conventional holder cannot be used for applications such as calibration (adjustment) of an infrared sensor, which require high accuracy and stability of the environmental temperature of the infrared sensor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a temperature control holder for an infrared sensor that can control the environmental temperature of the infrared sensor with high accuracy and stability using temperature-controlled air.

An infrared sensor temperature control holder according to one aspect of the present invention is a temperature control holder for an infrared sensor that houses the infrared sensor when the environmental temperature of the infrared sensor is controlled by temperature-controlled air, wherein the infrared sensor is a lens for receiving infrared rays emitted from a temperature measurement target; and a lens barrel for supporting the lens. A wall portion is provided on the ventilation surface, the opening being larger than the outer shape of the lens barrel, and forming a gap around the lens barrel for guiding the temperature-controlled air.

In the infrared sensor temperature control holder, the ventilation surface may be formed at a height that does not fall within the angle of view of the lens.

In the temperature control holder for the infrared sensor, the gap may be formed with a dimension smaller than the height of the ventilation surface at least in the ventilation direction of the temperature-controlled air.

The infrared sensor temperature control holder has a holder base to which the infrared sensor is attached, and a holder cover connected to the holder base so as to be openable and closable, wherein the holder cover forms the wall. may be

In the infrared sensor temperature control holder, a plurality of the infrared sensors can be attached to the holder base, and the holder cover forms the gap between the infrared sensors attached to the holder base. A plurality of openings may be formed.

According to one aspect of the present invention, it is possible to provide a temperature control holder for an infrared sensor that can control the environmental temperature of the infrared sensor with high accuracy and stability by temperature control air.

FIG. 3 is a cross-sectional view showing a temperature control holder for the infrared sensor according to the first embodiment of the present invention; FIG. 5 is a graph showing the relationship between the temperature detection error of the infrared detection element and the wind speed of temperature-controlled air when there is a wall and when there is no wall according to the first embodiment of the present invention. FIG. 8 is a perspective view showing a temperature control holder for an infrared sensor according to a second embodiment of the present invention; FIG. 7 is a cross-sectional view showing a main part of a temperature control holder for an infrared sensor according to a second embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a sectional view showing a temperature control holder 10 of an infrared sensor 1 according to a first embodiment of the invention.
As shown in FIG. 1 , the infrared sensor 1 has a lens 2 that receives infrared rays emitted from a temperature measurement target 100 and a lens barrel 3 that supports the lens 2 . Inside the lens barrel 3, an infrared detection element (not shown) and the like are accommodated.

The temperature measurement target 100 is, for example, a blackbody furnace for calibrating (adjusting) the infrared sensor 1 . The temperature control holder 10 of this embodiment is housed in a large constant temperature bath together with the temperature measurement object 100 . Temperature controlled air 200 for controlling the environmental temperature of the infrared sensor 1 is circulated in the constant temperature bath.

The temperature control holder 10 includes a holder base 11 to which the infrared sensor 1 is attached, and a wall portion 12 erected from the holder base 11 and forming a ventilation surface 13 for the temperature control air 200 at a position higher than the lens barrel 3. I have it. The temperature control holder 10 is made of, for example, an aluminum material that has good thermal conductivity and is lightweight. In particular, the wall portion 12 arranged on the side facing the temperature measurement target 100 is preferably made of a black alumite material obtained by surface-treating an aluminum material.

In the following description, an XYZ orthogonal coordinate system is set, and the configuration and positional relationship of each member may be described with reference to this XYZ orthogonal coordinate system. The X-axis direction is the ventilation direction of the temperature-controlled air 200 along the ventilation surface 13 . The Z-axis direction is the height direction of the wall portion 12 . The Y-axis direction is a direction orthogonal to the X-axis direction and the Z-axis direction.

The holder base 11 has a mounting surface 11 a for the infrared sensor 1 . The wall portion 12 is erected from the mounting surface 11 a in the Z-axis direction, and the upper end surface thereof forms a ventilation surface 13 . The ventilation surface 13 forms a plane parallel to the XY plane. On the ventilation surface 13, temperature-controlled air 200 flows along the X-axis direction.

The ventilation surface 13 is formed with a height H that does not fall within the angle of view 4 of the lens 2. - 特許庁The angle of view of the lens 2 is, for example, about 40°. The height H of the ventilation surface 13 is the distance from the lower end of the lens barrel 3 to the upper end surface of the wall portion 12 (ventilation surface 13).

The wall portion 12 has an opening larger than the outer shape of the lens barrel 3 on the ventilation surface 13 to form a gap S for guiding the temperature-controlled air 200 around the lens barrel 3 . The opening of the wall portion 12 includes an infrared passage through which infrared rays from the temperature measurement target 100 reach the infrared detecting element in the lens barrel 3 , and an infrared passage through which the temperature-controlled air 200 flowing along the ventilation surface 13 passes through the lens barrel 3 . It also serves as an air outlet that leads to the

The gap S between the wall portion 12 and the lens barrel 3 is preferably formed with a dimension smaller than the height H of the ventilation surface 13 at least in the ventilation direction (X-axis direction) of the temperature-controlled air 200 . That is, if the dimension of the gap S in the ventilation direction of the temperature-controlled air 200 is larger than the height H of the ventilation surface 13, the temperature-controlled air 200 flowing along the ventilation surface 13 easily flows into the gap S, This is because the wind blowing function of the wall portion 12 is deteriorated. The dimension of the gap S in the direction other than the ventilation direction of the temperature-controlled air 200 (for example, the Y-axis direction) has little effect on the inflow of the temperature-controlled air 200, so it is formed to be larger than the height H of the ventilation surface 13. I don't mind.

The gap S is preferably formed with a dimension in the range of 1/2 to 1/3 of the height H of the ventilation surface 13 at least in the ventilation direction (X-axis direction) of the temperature-controlled air 200 . That is, the dimension of the gap S in the ventilation direction of the temperature-controlled air 200 should not be too large. This is because the temperature control of the infrared sensor 1 by the temperature control air 200 does not go well.

FIG. 2 is a graph showing the relationship between the temperature detection error of the infrared detection element and the wind speed of the temperature-controlled air 200 when the wall portion 12 is present and when the wall portion 12 is not present according to the first embodiment of the present invention. . Note that FIG. 2 is a graph when the dimension of the gap S is set to 1/2 of the height H of the ventilation surface 13 .
As shown in FIG. 2, the side with the wall 12 (solid line) has a larger wind speed region than the side without the wall 12 (dashed line), where the temperature detection error of the infrared detection element is 0 and stable. That is, it can be seen that the presence of the wall portion 12 shown in FIG. 1 prevents the temperature-controlled air 200 from directly hitting the lens barrel 3, and as a result, the temperature detection error of the infrared detection element is suppressed.

As described above, the temperature control holder 10 for the infrared sensor 1 of the present embodiment described above can be used to control the ambient temperature of the infrared sensor 1 with the temperature-controlled air 200 . 10, the infrared sensor 1 has a lens 2 for receiving infrared rays emitted from a temperature measurement target 100 and a lens barrel 3 for supporting the lens 2. A wall portion 12 that forms a ventilation surface 13 for air conditioning 200, has an opening larger than the outer shape of the lens barrel 3 in the ventilation surface 13, and forms a gap S that guides the temperature-controlled air 200 around the lens barrel 3. there is According to this configuration, the temperature-controlled air 200 does not directly hit the lens barrel 3, and the environmental temperature of the infrared sensor 1 can be controlled with high precision and stability.

Further, in this embodiment, the ventilation surface 13 is formed at a height that does not fall within the angle of view 4 of the lens 2 . According to this configuration, it is possible to prevent the infrared detection angle (field of view) of the infrared sensor 1 from being restricted by the wall portion 12 .

Further, in the present embodiment, the gap S is formed with a dimension smaller than the height H of the ventilation surface 13 at least in the ventilation direction of the temperature-controlled air 200 . According to this configuration, it is possible to allow the temperature-controlled air 200 flowing along the ventilation surface 13 to flow into the gap S while maintaining the blowing function of the wall portion 12 .

(Second embodiment)
Next, a second embodiment of the invention will be described. In the following description, the same reference numerals are given to the same or equivalent configurations as in the above-described embodiment, and the description thereof will be simplified or omitted.

FIG. 3 is a perspective view showing the temperature control holder 10 of the infrared sensor 1 according to the second embodiment of the invention.
As shown in FIG. 3, the temperature control holder 10 for the infrared sensor 1 of the second embodiment includes a holder base 11 to which a plurality of infrared sensors 1 can be attached, and two holder bases 11 connected to the holder base 11 so as to be openable and closable. and a holder cover 20 .

A maximum of 24 infrared sensors 1 can be attached to the holder base 11 . That is, the temperature control holder 10 of the infrared sensor 1 of the second embodiment can simultaneously calibrate (adjust) a maximum of 24 infrared sensors 1 .

A plurality of openings 23 are formed in the holder cover 20 to form the above-described gap S between the infrared sensor 1 attached to the holder base 11 and the holder cover 20 . Twelve openings 23 are formed in one holder cover 20, as shown in FIG.

The holder cover 20 is connected to the holder base 11 via hinges 21 so as to be openable and closable. Moreover, the holder cover 20 can be fixed to the holder base 11 in a closed state by means of fasteners 22 . A T-shaped handle 30 is attached to the side surface of the holder base 11 to facilitate carrying the temperature control holder 10 .

The holder base 11 has a positioning pin 14 for positioning the infrared sensor 1 and a plurality of bosses 15 forming a mounting surface 11 a for the infrared sensor 1 . The positioning pin 14 is inserted into a positioning hole provided in the substrate 5 (not shown in FIG. 1 described above) of the infrared sensor 1 that supports the lens barrel 3 . The boss 15 has a screw hole into which the substrate 5 of the infrared sensor 1 can be screwed.

FIG. 4 is a cross-sectional view showing a main part of the temperature control holder 10 of the infrared sensor 1 according to the second embodiment of the invention.
As shown in FIG. 4, the holder base 11 has a front case 11A that supports a plurality of infrared sensors 1 and a rear case 11B that supports an inspection board 40 electrically connected to the plurality of infrared sensors 1. is doing.

A space S1 is formed between the mating surfaces of the front case 11A and the rear case 11B, and an electrode 6 or the like for electrically connecting the infrared sensor 1 and the inspection board 40 can be arranged. The inspection board 40 is covered with a rear cover 50 . As shown in FIG. 3, one end portion 41 of the inspection substrate 40 protrudes from the holder base 11 (rear cover 50), and is electrically connectable to an external inspection device (calibration device) (not shown), for example. .

As shown in FIG. 4, in the second embodiment, the holder cover 20 forms the wall portion 12 described above. That is, the holder cover 20 forms a ventilation surface 13 for the temperature-controlled air 200 at a position higher than the lens barrel 3, and the ventilation surface 13 has an opening larger than the external shape of the lens barrel 3, so that the surroundings of the lens barrel 3 can be heated. A gap S for guiding the air conditioning 200 is formed. The ventilation surface 13 is formed at a height not within the angle of view 4 of the lens 2, and the gap S is at least the height H of the ventilation surface 13 in the ventilation direction (X-axis direction) of the temperature-controlled air 200. formed with smaller dimensions than

According to the second embodiment having the above-described configuration, the holder cover 20 serves as a wind blower as in the above-described first embodiment, so that the temperature-controlled air 200 does not directly hit the lens barrel 3, and the ambient temperature of the infrared sensor 1 is reduced. can be controlled with high precision and stability.

Further, in the second embodiment, a holder base 11 to which the infrared sensor 1 is attached, and a holder cover 20 connected to the holder base 11 so as to be openable and closable are provided. forming. According to this configuration, opening and closing the holder cover 20 facilitates attachment and detachment of the infrared sensor 1 .

Further, in the second embodiment, a plurality of infrared sensors 1 can be attached to the holder base 11, and a gap S is provided between the holder cover 20 and the infrared sensors 1 attached to the holder base 11. A plurality of forming openings 23 are formed. According to this configuration, a plurality of infrared sensors 1 can be calibrated (adjusted) at the same environmental temperature at the same time.

While the preferred embodiments of the invention have been described and described, it is to be understood that they are illustrative of the invention and should not be considered limiting. Additions, omissions, substitutions, and other modifications may be made without departing from the scope of the invention. Accordingly, the invention should not be viewed as limited by the foregoing description, but rather by the claims appended hereto.

DESCRIPTION OF SYMBOLS 1... Infrared sensor 2... Lens 3... Lens barrel 4... Angle of view 5... Substrate 6... Electrode 10... Temperature control holder 11... Holder base 11a... Mounting surface 11A... Front case 11B... Rear case 12 Wall portion 13 Ventilation surface 14 Positioning pin 15 Boss 20 Holder cover 21 Hinge 22 Fastener 23 Opening 30 Handle 40 Inspection board 41...One end 50...Rear cover 100...Temperature measurement target 200...Temperature controlled air S...Gap S1...Space

Claims (5)

An infrared sensor temperature control holder for housing the infrared sensor when controlling the environmental temperature of the infrared sensor with temperature-controlled air,
The infrared sensor has a lens that receives infrared rays emitted from a temperature measurement target, and a lens barrel that supports the lens,
A ventilation surface for the temperature-controlled air is formed at a position higher than the lens barrel, and the ventilation surface has an opening larger than the outer shape of the lens barrel to form a gap for introducing the temperature-controlled air around the lens barrel. A holder for temperature control of an infrared sensor, characterized by comprising a wall portion that 2. A temperature control holder for an infrared sensor according to claim 1, wherein said ventilation surface is formed at a height that does not fall within the angle of view of said lens. 3. A temperature control holder for an infrared sensor according to claim 1, wherein said gap is formed with a dimension smaller than the height of said ventilation surface at least in the ventilation direction of said temperature-controlled air. a holder base to which the infrared sensor is attached;
a holder cover connected to the holder base so as to be openable and closable;
4. The infrared sensor temperature control holder according to claim 1, wherein the holder cover forms the wall. A plurality of the infrared sensors can be attached to the holder base,
5. The infrared sensor according to claim 4, wherein the holder cover is formed with a plurality of openings forming the gaps between the holder cover and the infrared sensor attached to the holder base. Temperature control holder.

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