Temperature control holder with infrared sensor

Abstract

To provide a holder for temperature adjustment of an infrared sensor, that is capable of highly accurately and stably controlling the environmental temperature of an infrared sensor using temperature adjusting air.SOLUTION: Provided is a holder 10 which accommodates an infrared sensor 1 in order to adjust a temperature of the infrared sensor 1, in controlling an environmental temperature of the infrared sensor 1 using temperature adjusting air 200. The infrared sensor 1 comprises: a lens 2 for receiving infrared rays radiated from a temperature measuring object 100; and a lens-barrel 3 for supporting the lens 2. The holder is provided with a wall part 12 which forms a ventilation surface 13 of the temperature adjusting air 200 at a position above the lens-barrel 3, and has an opening that is larger than an outer shape of the lens-barrel 3 at the ventilation surface 13, and further, forms a space S leading the temperature adjusting air 200 to the periphery of the lens-barrel 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a temperature control holder for an infrared sensor. [Background technology]

[0002] A temperature detector described in Patent Document 1 listed below has been known for some time. This temperature detector is an infrared sensor that includes an infrared detection element that detects infrared rays emitted from an object to be measured, a lens that receives the infrared rays emitted from the object to be measured and narrows the angle of the infrared light incident on the infrared detection element, and a lens barrel (referred to as a holder in Patent Document 1) that supports the lens. In an infrared sensor, if the temperature near the infrared detection element becomes unstable, accurate temperature detection becomes impossible. Therefore, the infrared sensor is housed in a holder (referred to as a case in Patent Document 1), and the holder is provided with a ventilation hole, and the ambient temperature of the infrared sensor is controlled by temperature-controlled air flowing in through the ventilation hole. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-307940 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the ventilation holes in the holder of the above-mentioned conventional technology are formed facing the side of the lens barrel (see Figure 1 of Patent Document 1). Even if the temperature-controlled air is circulated and blown inside the thermostatic chamber, the temperature of the blown air is not stable. Therefore, if the temperature-controlled air flowing in from the ventilation holes directly hits the lens barrel, it can cause temperature detection errors in the infrared detection element. For this reason, the holder of the above-mentioned conventional technology could not be used in applications requiring high accuracy and stability of the ambient temperature of the infrared sensor, such as calibration (adjustment) of the infrared sensor.

[0005] The present invention has been made in view of the above problems, and has as its object to provide a temperature control holder for an infrared sensor that can control the ambient temperature of the infrared sensor with high precision and stability using temperature-controlled air. [Means for solving the problem]

[0006] A temperature control holder for an infrared sensor according to one aspect of the present invention is a temperature control holder for an infrared sensor that houses the infrared sensor when controlling the ambient temperature of the infrared sensor with temperature-controlled air, and the infrared sensor has a lens that receives infrared rays emitted from an object to be measured for temperature and a barrel that supports the lens, and forms a ventilation surface for the temperature-controlled air at a position higher than the barrel, and is equipped with a wall portion that opens at the ventilation surface larger than the outer shape of the barrel and forms a gap around the barrel for guiding the temperature-controlled air.

[0007] In the temperature control holder for an infrared sensor, the ventilation surface may be formed at a height that does not enter the angle of view of the lens.

[0008] In the temperature control holder for an 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 control air.

[0009] The temperature control holder for the infrared sensor may include a holder base on which the infrared sensor is attached, and a holder cover connected to the holder base so as to be openable and closable, and the holder cover may form the wall portion.

[0010] In the temperature control holder for the infrared sensor, multiple infrared sensors can be attached to the holder base, and the holder cover may have multiple openings that form the gap between the infrared sensors attached to the holder base. [Effects of the Invention]

[0011] According to the above 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 precision and stability using temperature-controlled air. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a cross-sectional view showing a temperature control holder of an infrared sensor according to a first embodiment of the present invention. [Figure 2] 4 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 when a wall portion is present and when a wall portion is not present according to the first embodiment of the present invention. FIG. [Figure 3] FIG. 10 is a perspective view showing a temperature control holder of an infrared sensor according to a second embodiment of the present invention. [Figure 4] FIG. 6 is a cross-sectional view showing a main part of a temperature control holder of an infrared sensor according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0014] (First embodiment) FIG. 1 is a cross-sectional view showing a temperature control holder 10 of an infrared sensor 1 according to a first embodiment of the present invention. 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. The lens barrel 3 houses an infrared detection element (not shown) and other components.

[0015] The temperature measurement object 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 thermostatic chamber together with the temperature measurement object 100. Temperature-controlled air 200 that controls the environmental temperature of the infrared sensor 1 circulates within the thermostatic chamber.

[0016] The temperature control holder 10 includes a holder base 11 on which the infrared sensor 1 is attached, and a wall 12 that stands upright from the holder base 11 and forms a ventilation surface 13 for the temperature-controlled air 200 at a position higher than the lens barrel 3. The temperature control holder 10 is made of, for example, a lightweight aluminum material with good thermal conductivity. In particular, the wall 12, which is disposed on the side facing the temperature measurement target 100, is preferably made of a black anodized aluminum material that has been surface-treated.

[0017] In the following description, an XYZ Cartesian coordinate system is set, and the configuration and positional relationship of each component may be described with reference to this XYZ Cartesian coordinate system. The X-axis direction is the direction of flow of temperature-controlled air 200 along ventilation surface 13. The Z-axis direction is the height direction of wall portion 12. The Y-axis direction is perpendicular to the X-axis and Z-axis directions.

[0018] The holder base 11 has a mounting surface 11a for the infrared sensor 1. The wall portion 12 stands in the Z-axis direction from the mounting surface 11a, and its upper end surface 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.

[0019] The ventilation surface 13 is formed at a height H that does not fall within the angle of view 4 of the lens 2. 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 bottom end of the lens barrel 3 to the top surface of the wall portion 12 (ventilation surface 13).

[0020] Wall 12 has an opening at ventilation surface 13 that is larger than the outer shape of barrel 3, forming a gap S that guides temperature-controlled air 200 around barrel 3. This opening in wall 12 serves both as an infrared passage port through which infrared rays from temperature measurement target 100 reach the infrared detection element inside barrel 3, and as an air outlet that guides temperature-controlled air 200 flowing along ventilation surface 13 around barrel 3.

[0021] 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-conditioned air 200. That is, if the dimension of the gap S in the ventilation direction of the temperature-conditioned air 200 were larger than the height H of the ventilation surface 13, the temperature-conditioned air 200 flowing along the ventilation surface 13 would be more likely to flow into the gap S, reducing the wind blocking function of the wall portion 12. Note that the dimension of the gap S in directions other than the ventilation direction of the temperature-conditioned air 200 (for example, the Y-axis direction) has little effect on the inflow of the temperature-conditioned air 200, and therefore may be formed with a dimension larger than the height H of the ventilation surface 13.

[0022] 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-conditioned air 200. That is, the dimension of the gap S in the ventilation direction of the temperature-conditioned air 200 must not be too large, and conversely, if it is too small, it will be difficult for the temperature-conditioned air 200 flowing along the ventilation surface 13 to flow into the gap S, and the temperature of the infrared sensor 1 will not be regulated well by the temperature-conditioned air 200.

[0023] 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 there is a wall 12 according to the first embodiment of the present invention and when there is no wall 12. 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. 2, it can be seen that the wind speed region where the temperature detection error of the infrared detection element is stable at 0 is larger on the side with wall 12 (solid line) than on the side without wall 12 (dashed line). In other words, it can be seen that the presence of wall 12 shown in FIG. 1 prevents temperature-controlled air 200 from directly hitting lens barrel 3, and as a result, the temperature detection error of the infrared detection element is suppressed.

[0024] As described above, the temperature control holder 10 for the infrared sensor 1 of the present embodiment is a temperature control holder 10 for the infrared sensor 1 that houses the infrared sensor 1 when controlling the environmental temperature of the infrared sensor 1 with the temperature-controlled air 200, and the infrared sensor 1 has a lens 2 that receives infrared rays radiated from the temperature-measurement target 100 and a lens barrel 3 that supports the lens 2, and is provided with a wall portion 12 that forms a ventilation surface 13 for the temperature-controlled air 200 at a position higher than the lens barrel 3, and 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 for guiding the temperature-controlled air 200. With 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.

[0025] In addition, 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. This configuration prevents the wall portion 12 from limiting the infrared detection angle (field of view) of the infrared sensor 1.

[0026] Furthermore, in this 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. With this configuration, the temperature-controlled air 200 flowing along the ventilation surface 13 can flow into the gap S while maintaining the wind blocking function of the wall portion 12.

[0027] (Second embodiment) Next, a second embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiment will be denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0028] FIG. 3 is a perspective view showing a temperature control holder 10 of an infrared sensor 1 according to a second embodiment of the present invention. As shown in Figure 3, the temperature control holder 10 for the infrared sensor 1 of the second embodiment has a holder base 11 to which multiple infrared sensors 1 can be attached, and two holder covers 20 connected to the holder base 11 so that they can be opened and closed.

[0029] The holder base 11 can be fitted with a maximum of 24 infrared sensors 1. In other words, the temperature control holder 10 for the infrared sensors 1 of the second embodiment can calibrate (adjust) a maximum of 24 infrared sensors 1 simultaneously.

[0030] The holder cover 20 has a plurality of openings 23 formed therein, which form the above-mentioned gap S between the holder cover 20 and the infrared sensor 1 attached to the holder base 11. As shown in FIG. 3, twelve openings 23 are formed in each holder cover 20.

[0031] The holder cover 20 is connected to the holder base 11 via hinges 21 so as to be able to open and close. The holder cover 20 can be fixed in a closed state to the holder base 11 by fasteners 22. A T-shaped handle 30 is attached to the side of the holder base 11 to make it easy to carry the temperature control holder 10.

[0032] The holder base 11 has positioning pins 14 that position the infrared sensor 1, and a plurality of bosses 15 that form the mounting surface 11a of the infrared sensor 1. The positioning pins 14 are inserted into positioning holes provided in a substrate 5 (not shown in the above-mentioned FIG. 1) of the infrared sensor 1 that supports the lens barrel 3. The bosses 15 have screw holes into which the substrate 5 of the infrared sensor 1 can be screwed.

[0033] 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 present invention. As shown in FIG. 4, the holder base 11 has a front case 11A that supports the plurality of infrared sensors 1, and a rear case 11B that supports an inspection board 40 that is electrically connected to the plurality of infrared sensors 1.

[0034] A space S1 is formed at the mating surface between the front case 11A and the rear case 11B, and allows for the placement of electrodes 6 and the like that electrically connect the infrared sensor 1 and the inspection board 40. The inspection board 40 is covered with a rear cover 50. As shown in FIG. 3, one end 41 of the inspection board 40 protrudes from the holder base 11 (rear cover 50), and can be electrically connected to, for example, an external inspection device (calibration device) not shown.

[0035] 4, in the second embodiment, holder cover 20 forms the above-mentioned wall portion 12. In other words, holder cover 20 forms ventilation surface 13 for temperature-conditioned air 200 at a position higher than lens barrel 3, and has an opening at ventilation surface 13 that is larger than the outer shape of lens barrel 3, forming gap S for guiding temperature-conditioned air 200 around lens barrel 3. Furthermore, ventilation surface 13 is formed at a height that does not fall within angle of view 4 of lens 2, and gap S is formed with a dimension that is smaller than height H of ventilation surface 13, at least in the ventilation direction (X-axis direction) of temperature-conditioned air 200.

[0036] According to the second embodiment having the above configuration, similar to the first embodiment described above, the holder cover 20 acts as a wind blocker, so that the temperature-controlled air 200 does not directly hit the lens barrel 3, and the ambient temperature of the infrared sensor 1 can be controlled with high precision and stability.

[0037] Moreover, the second embodiment has 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, and the holder cover 20 forms the wall portion 12. According to this configuration, opening and closing the holder cover 20 makes it easy to attach and detach the infrared sensor 1.

[0038] Furthermore, in the second embodiment, a plurality of infrared sensors 1 can be attached to the holder base 11, and the holder cover 20 is formed with a plurality of openings 23 that form gaps S between the infrared sensors 1 attached to the holder base 11. With this configuration, a plurality of infrared sensors 1 can be calibrated (adjusted) simultaneously at the same ambient temperature.

[0039] While preferred embodiments of the present invention have been described and illustrated, it should be understood that these are illustrative of the present invention and should not be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the scope of the present invention. Accordingly, the present invention should not be deemed limited by the foregoing description, but rather by the scope of the claims. [Explanation of symbols]

[0040] 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 substrate, 41...one end, 50...rear cover, 100...temperature measurement object, 200...temperature controlled air, S...gap, S1...space

Claims

1. A temperature control holder with an infrared sensor that controls the environmental temperature of the infrared sensor by temperature-controlled air, the infrared sensor has a lens that receives infrared rays radiated from an object to be measured, and a lens barrel that supports the lens; A temperature control holder with an infrared sensor, characterized in that 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 that is larger than the outer shape of the lens barrel, and is provided with a wall portion that forms a gap that guides the temperature-controlled air from the lens side to the periphery of the lens barrel.

2. 2. The temperature control holder with an infrared sensor according to claim 1, wherein the ventilation surface is formed at a height that does not enter the angle of view of the lens.

3. The temperature control holder with infrared sensor described in claim 1 or 2, characterized in that the gap is formed with a dimension in the range of 1 / 2 to 1 / 3 of the distance from the lower end of the lens barrel to the upper end surface of the wall portion, at least in the ventilation direction of the temperature control air.

4. 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 temperature control holder with an infrared sensor according to claim 1, wherein the holder cover forms the wall portion.

5. A plurality of the infrared sensors can be attached to the holder base, The temperature control holder with infrared sensor according to claim 4, characterized in that the holder cover has a plurality of openings that form the gap between the holder cover and the infrared sensor attached to the holder base.

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