JP2018189841A - Black body plate and infrared radiation measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a black body plate that exhibits a high black body emissivity.SOLUTION: A black body plate comprises a substrate 10 having flat plate surfaces, and a plurality of V-grooves 20 juxtaposed next to each other without gaps on one plate surface in such a way that a center line of each groove is perpendicular to the plate surface of the substrate 10, and a plurality of extended groove bottoms 30 provided at a bottom of each V-groove 20, each extended groove bottom 30 being in communication with a corresponding V-groove 20 and having a shape that is bent in a direction crossing the groove center line.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a black body plate and an infrared radiation measuring apparatus having the black body plate.

  The black body plate is used in infrared radiation measurement equipment such as the multi-wavelength optical radiometer (Second Generation Global Imager: SGLI) mounted on the Global Change Observation Mission-Climate Satellite (GCOM-C Satellite). Used as a built-in blackbody radiation source. Since the black body plate is smaller, thinner and lighter than a black body radiation source such as a black body furnace, it is useful for reducing the size, thickness and weight of an infrared radiation measuring apparatus.

  By the way, a black body radiation source including a black body plate is required to have a high black body radiation rate. As a technique for obtaining a high black body radiation rate in a black body plate, for example, there is a technique of forming a groove having a V-shaped cross section (hereinafter also referred to as a V groove) on the plate surface of the black body plate.

  Technologies related to the improvement of black body emissivity and infrared emissivity are disclosed in, for example, Patent Documents 1 to 3.

Japanese Patent Laying-Open No. 2015-063116 JP, 2006-038041, A JP 2009-104973 A

  As described above, the black body emissivity can be expected to be improved by forming the V groove on the plate surface of the black body plate, but there is room for improvement. This is because an R shape exists at the bottom of the V groove, in other words, at the apex of the V groove. The presence of the R shape means that there is a reflection surface perpendicular to the direction of incidence of infrared rays on the black body plate. As a result of the incident infrared rays being reflected by this reflecting surface, the black body emissivity is lowered.

  In addition, when forming a V groove using a cutting tool, the measure which raises a processing precision can be considered so that R shape may not exist as much as possible. However, in order to increase the machining accuracy, for example, when the cutting tool is made highly accurate or the cutting tool is frequently replaced, not only is it disadvantageous in terms of cost, but in reality it is not possible to eliminate the R shape. It is considered impossible.

  Alternatively, a manufacturing method is conceivable in which a portion including one groove wall surface of the V-groove and a portion including the other groove wall surface are formed as separate parts, and then both are joined so that the R shape does not exist. However, since the completed black body plate has a structure in which a plurality of parts are joined, the uniformity of the in-plane temperature distribution may be impaired.

  The objective of this invention is providing the technique for solving the said subject, and is providing the black body board which has a high black body emissivity.

  Another object of the present invention is to provide an infrared radiation measuring apparatus having a black body plate as described above.

  According to one aspect of the present invention, a substrate having a flat plate surface and a groove center line perpendicular to the plate surface of the substrate are arranged in parallel with the plate surface without a gap. And a plurality of extension groove bottoms provided at the bottom of each of the plurality of V groove parts, and each of the plurality of extension groove bottoms includes the plurality of V grooves. A black body plate is obtained which communicates with each of the groove portions and exhibits a shape bent toward the direction intersecting the groove center line.

  According to another aspect of the present invention, the black body plate as a black body radiation source, an infrared imaging device, an infrared path provided at an incident portion of the infrared imaging device and facing a measurement target, and the black body An infrared radiation measurement device having an infrared path switching unit that switches between infrared paths facing the body plate is obtained.

  According to still another aspect of the present invention, there is provided a method for manufacturing the black body plate, the step of forming the plurality of V-groove portions by cutting on the plate surface of the substrate, and the plurality of V-groove portions. And a step of forming the plurality of extended groove bottoms by cutting.

  The black body plate according to the present invention has a high black body radiation rate.

It is a fragmentary sectional view of the black body board by a 1st embodiment of the present invention. It is a figure which shows the black body board by the 2nd Embodiment of this invention, (a) is a top view, (b) is the side view seen from the X direction, (c) is the side view seen from the Y direction. d) is a partial side view of the portion 2D, and (e) is a partial side view of the portion 2E. It is a fragmentary sectional view of the black body board by related technology.

  A black body plate according to an embodiment of the present invention includes a substrate having a flat plate surface, a plurality of V-groove portions, and a plurality of extended groove bottom portions.

  The plurality of V-groove portions are provided so that the respective groove center lines are perpendicular to the plate surface of the substrate and are arranged in parallel on the plate surface without any gaps.

  The plurality of extended groove bottom portions are provided at the groove bottom portions of the plurality of V groove portions.

  Each of the plurality of extended groove bottom portions communicates with each of the plurality of V groove portions and has a shape bent in a direction intersecting the groove center line.

  With the above configuration, the black body plate according to the present invention has a high black body radiation rate.

  Hereinafter, a more specific embodiment of a black body plate and an infrared radiation measuring apparatus having a black body plate according to the present invention will be described with reference to the drawings.

[First Embodiment]
[Black body board]
Referring to FIG. 1, a black body plate according to a first embodiment of the present invention includes a single substrate 10 having a flat plate surface 11 and a plurality of V-groove portions 20 (only one is shown in FIG. 1). And a plurality of extended groove bottom portions 30. In addition, since a plurality of V-groove portions 20 are formed on the plate surface 11 without any gaps as will be described later, when the black body plate is manufactured, it does not exist as a flat surface. I'm drawing. Further, in the present invention, a flat surface means a straight surface that does not bend over a two-dimensional direction, rather than a surface having no irregularities.

  The plurality of V-groove portions 20 are provided so that each groove center line z20 is perpendicular to the plate surface 11 of the substrate 10 and parallel to the plate surface 11 in the left-right direction in the drawing without any gap. ing. In the figure, each of the plurality of V-grooves 20 extends in a direction perpendicular to the paper surface in the figure. Therefore, the groove center line in the present invention means a center line on the cross section of the V groove portion. Therefore, in FIG. 1, the groove center line exists in a direction perpendicular to the paper surface.

  The plurality of extended groove bottom portions 30 are provided at the groove bottom portion including the virtual groove bottom vertex vx20 of each of the plurality of V groove portions 20.

  Each of the plurality of extended groove bottom portions 30 communicates with each of the plurality of V groove portions 20 and has a shape bent in a direction intersecting the groove center line z20 (lower left direction in the drawing).

  With such a structure, the black body plate according to the present embodiment has a high black body radiation rate.

  Each of the plurality of V-groove portions 20 includes a first inclined surface 21 and a second inclined surface 22 on a cross section parallel to the groove center line z20. The first inclined surface 21 and the second inclined surface 22 have the same inclination angles α21 and α22 with respect to the groove center line z20. In the present invention, the first inclined surface 21 and the second inclined surface 22 may have inclination angles α21, α22 with respect to the groove center line z20 of less than 45 degrees, respectively. When the inclination angle is 45 degrees or more, the same reflection action as that of the parabolic reflector is performed, and the black body radiation rate is reduced. In particular, when the inclination angle is 45 degrees, the same reflecting action as that of the corner reflector is performed, and the black body radiation rate is greatly reduced. It is desirable that the tilt angle be as small as possible in order to prevent infrared reflection. However, for example, when the V-groove portion is formed by cutting, the inclination angle depends on the tip shape of the cutting tool, and therefore a too small inclination angle is difficult for manufacturing convenience. In this example, the inclination angles α21 and α22 are each 30 degrees.

  In FIG. 1, reference numeral vx20 indicates a virtual vertex of the V groove 20. Reference numeral rx21 denotes an end portion of the first inclined surface 21.

  Each of the plurality of extended groove bottoms 30 includes an extended inclined surface 31 that is continuous with the second inclined surface 22 at the same inclination angle as the inclination angle α22 of the second inclined surface 22 on a cross section parallel to the groove center line z20. It is out.

  In this example, the substrate 10 is made of a metal, for example, an aluminum alloy. In the present invention, the material of the substrate is not limited to the aluminum alloy, but may be a magnesium alloy or stainless steel, or may be a material other than a metal.

  The surface of at least the plurality of V-groove portions 20 and the plurality of extended groove bottom portions 30 of the substrate 10 is subjected to blackening treatment or black coating. In this example, since the substrate 10 is made of an aluminum alloy, black anodizing treatment is performed as blackening treatment. In the case of a substrate made of magnesium alloy or stainless steel, black coating is applied. In the case of an aluminum alloy substrate, black coating may be applied.

  As is apparent from FIG. 1, at least from the groove opening portion along the groove center line among the surface defining each of the plurality of V-groove portions 20 and the surface defining each of the plurality of extended groove bottom portions 30. All the surfaces facing the outside are inclined at an angle of less than 90 degrees, preferably less than 45 degrees with respect to the groove center line z20 on a cross section parallel to the groove center line z20. In this example, the inclination angle is 30 degrees. For this reason, infrared rays incident perpendicularly to the plate surface 11 of the substrate 10 of the black body plate are not reflected in the incident direction.

  Therefore, the black body plate according to the present embodiment has a high black body radiation rate.

  On the other hand, referring to FIG. 3, the black body plate as a comparative example has a substrate 60 having a flat plate surface 61 and a plurality of V-groove portions 70 (only one is shown in FIG. 3). However, it does not have a structure corresponding to the extended groove bottom according to the present invention. The plurality of V-groove portions 70 are provided so that the respective groove center lines z70 are perpendicular to the plate surface 61 of the substrate 60, and are arranged in parallel in the left-right direction in the drawing without any gap. ing. In FIG. 3, a symbol rx70 indicates the apex portion of the V groove portion 70. An R shape exists at the vertex rx70. For this reason, there exists a reflecting surface perpendicular to the incident direction of infrared rays on the black body plate. As a result of the incident infrared rays being reflected by this reflecting surface, the black body emissivity is lowered.

[Black body plate manufacturing method]
Next, a black body plate manufacturing method according to the first embodiment will be described with reference to FIG.

  First, a single substrate 10 made of an aluminum alloy and having a flat plate surface 11 is manufactured.

  Next, a plurality of V-groove portions 20 are formed on the plate surface 11 of the substrate 10 by cutting. In this cutting process, for example, a conical cutting blade is used standing vertically with respect to the plate surface 11 of the substrate 10.

  Next, a plurality of extended groove bottom portions 30 are formed by cutting the plurality of V groove portions 20. In this cutting process, for example, a disc-shaped cutting blade is used with an inclination angle of less than 90 degrees with respect to the groove center line z20. Particularly in this example, cutting is performed along a disk-shaped cutting blade along the second inclined surface 22 (at an inclination angle of 30 degrees with respect to the groove center line z20).

  Next, blackening treatment or black coating is applied to the surfaces of at least the plurality of V-groove portions 20 and the plurality of extended groove bottom portions 30 of the substrate 10. In this example, since the substrate 10 is made of an aluminum alloy, the entire substrate 10 is subjected to black anodizing treatment. Since the anodizing treatment is known, the description thereof is omitted. Alternatively, black coating may be applied to the surfaces of at least the plurality of V-groove portions 20 and the plurality of extended groove bottom portions 30 of the substrate 10.

  The black body plate manufactured as described above is attached to, for example, a base plate (not shown) as an attachment interface together with a frame (not shown), and further an infrared radiation measuring device (not shown). Mounted in place.

[Infrared radiation measurement equipment]
The infrared radiation measuring apparatus according to the present embodiment is SGLI mounted on the GCOM-C satellite.

  This infrared radiation measuring apparatus has the black body plate shown in FIG. 1, an infrared imaging device, and an infrared path switching unit.

  The infrared path switching unit includes an infrared path facing the ground as a measurement target, an infrared path facing the deep space as the first black body radiation source, and an infrared path facing the black body plate as the second black body radiation source. And switch.

  In this SGLI, in order to improve the observation accuracy, the deep space (about 4K (Kelvin) low temperature black body) as the first black body radiation source and the black body plate (about about 2K black body radiation source). Two-point calibration is performed on the satellite orbit using a 300K (Kelvin room temperature black body). The deep space as the first black body radiation source is stable at a very low temperature (about 4K). The black body plate as the second black body radiation source is built in the SGLI and is temperature-controlled at a normal temperature (about 300 K) using a high-accuracy temperature sensor.

  The infrared path switching unit includes, for example, a scanning mirror or a chopper that makes a round at 740 ms (milliseconds), and switches between the first black body radiation source and the second black body radiation source by the infrared imaging device, and performs imaging. Perform circumferential calibration.

[Second Embodiment]
[Black body board]
The second embodiment of the present invention differs from the first embodiment in that it has a plurality of V groove portions and a plurality of extended groove bottom portions in each of the X direction and the Y direction along the plate surface of the substrate. ing. For this reason, in the following description of the second embodiment, for the same or similar points as in the first embodiment, the description of the first embodiment and the drawings will be referenced as needed. .

  Referring to FIGS. 2A to 2E, a black body plate according to the second embodiment of the present invention includes a single substrate 10 having a flat plate surface 11, a plurality of V-groove portions 20, and a plurality of V-groove portions. The extended groove bottom 30 and the base plate 50 are provided. Since the plate surface 11 does not exist as a flat surface when the black body plate is manufactured, it is drawn with a broken line in FIGS. 2 (d) and 2 (e). In the present invention, the flat surface means a straight surface that does not bend over a two-dimensional direction.

  The plate surface 11 of the substrate 10 extends in the X direction and the Y direction that are perpendicular to each other. In the drawing, the Z direction indicates a direction parallel to a thickness direction of the substrate 10 or a groove center line z20 described later.

  Each of the plurality of V-groove portions 20 extends in the X direction, and extends in the Y direction with each of the first plurality of V-groove portions 20A arranged in parallel in the Y direction with a predetermined groove width. A plurality of V-groove portions 20A are included, and the second plurality of V-groove portions 20B are arranged in parallel in the X direction with no gaps. In other words, the black body plate according to the second embodiment has a plurality of pyramidal grooves.

  The first plurality of extended groove bottom portions 30A are provided at the groove bottom portions including the virtual groove bottom vertices of the first plurality of V groove portions 20A. The second plurality of extended groove bottom portions 30B are provided at the groove bottom portions including the virtual groove bottom vertices of the second plurality of V groove portions 20B.

  Each of the first plurality of extended groove bottom portions 30A communicates with each of the first plurality of V groove portions 20A and has a shape bent toward the direction intersecting the groove center line z20 (Y direction and Z direction). Presents. Each of the second plurality of extended groove bottom portions 30B communicates with each of the second plurality of V-groove portions 20B and has a shape bent toward the direction intersecting the groove center line z20 (X direction and Z direction). Presents.

  With such a structure, the black body plate according to the present embodiment has a high black body radiation rate.

  Each V groove portion of the first plurality of V groove portions 20A and the second plurality of V groove portions 20B includes a first inclined surface 21 and a second inclined surface 22 on a cross section parallel to the groove center line z20. Yes. The first inclined surface 21 and the second inclined surface 22 have the same inclination angle with respect to the groove center line z20. In the present invention, the first inclined surface 21 and the second inclined surface 22 may each have an inclination angle with respect to the groove center line z20 of less than 45 degrees. It is desirable that the tilt angle be as small as possible in order to prevent infrared reflection. However, for example, when the V-groove portion is formed by cutting, the inclination angle depends on the tip shape of the cutting tool, and therefore a too small inclination angle is difficult for manufacturing convenience. In this example, each inclination angle is 30 degrees.

  The extended groove bottom portions of the first plurality of extended groove bottom portions 30A and the second plurality of extended groove bottom portions 30B have the same inclination angle as the inclination angle of the second inclined surface 22 on the cross section parallel to the groove center line z20. An extended inclined surface continuous to the second inclined surface 22 is included.

  The substrate 10 is made of a metal, for example, an aluminum alloy, as in the first embodiment. In the present invention, the material of the substrate is not limited to the aluminum alloy, but may be a magnesium alloy or stainless steel, or may be a material other than a metal.

  The surface of at least the first plurality of V-groove portions 20A, the second plurality of V-groove portions 20B, the first plurality of extension groove bottom portions 30A, and the second plurality of extension groove bottom portions 30B of the substrate 10 is black. Or black paint is applied. In this example, since the substrate 10 is made of an aluminum alloy, black anodizing treatment is performed as blackening treatment. In the case of a substrate made of magnesium alloy or stainless steel, black coating is applied. In the case of an aluminum alloy substrate, black coating may be applied.

  As in the first embodiment, the surfaces defining the V groove portions of the first plurality of V groove portions 20A and the second plurality of V groove portions 20B, the first plurality of extension groove bottom portions 30A, the first Among the surfaces defining the extended groove bottoms of the plurality of extended groove bottoms 30B, at least all surfaces facing the outside from the groove opening along the groove center line are on the cross section parallel to the groove center line z20. The tilt angle is less than 90 degrees, preferably less than 45 degrees with respect to the center line z20. In this example, the inclination angle is 30 degrees. For this reason, infrared rays incident perpendicularly to the plate surface 11 of the substrate 10 of the black body plate are not reflected in the incident direction.

  Therefore, the black body plate according to the present embodiment also has a high black body radiation rate. Since the black body plate of the second embodiment has a V-groove part and an extended groove bottom part in a two-dimensional direction, it has a higher black body emissivity than the black body plate of the first embodiment. In particular, the black body plate of the second embodiment is useful when used in combination with an infrared path switching unit such as a scanning mirror.

[Black body plate manufacturing method]
Next, a black body plate manufacturing method according to the second embodiment will be described with reference to FIG.

  First, a single substrate 10 made of an aluminum alloy and having a flat plate surface 11 is manufactured.

  Next, the first plurality of V-groove portions 20A are formed on the plate surface 11 of the substrate 10 by cutting. In this cutting process, for example, a conical cutting blade is used standing vertically with respect to the plate surface 11 of the substrate 10.

  Subsequently, a second plurality of V-groove portions 20B are formed on the plate surface 11 of the substrate 10 by cutting. Also in this cutting process, for example, a conical cutting blade is used standing vertically with respect to the plate surface 11 of the substrate 10.

  Next, the first plurality of extended groove bottom portions 30A are formed by cutting the first plurality of V groove portions 20A. In this cutting process, for example, a disc-shaped cutting blade is used with an inclination angle of less than 90 degrees with respect to the groove center line z20. Particularly in this example, cutting is performed along a disk-shaped cutting blade along the second inclined surface 22 (at an inclination angle of 30 degrees with respect to the groove center line z20).

  Subsequently, the second plurality of extended groove bottom portions 30B are formed by cutting the second plurality of V-groove portions 20B. Also in this cutting process, a disk-shaped cutting blade is cut along the second inclined surface 22 (at an inclination angle of 30 degrees with respect to the groove center line z20).

  Next, on the surface of at least the first plurality of V groove portions 20A, the second plurality of V groove portions 20B, the first plurality of extension groove bottom portions 30A, and the second plurality of extension groove bottom portions 30B of the substrate 10, Apply blackening or black paint. In this example, since the substrate 10 is made of an aluminum alloy, the entire substrate 10 is subjected to black anodizing treatment. Since the anodizing treatment is known, the description thereof is omitted. Alternatively, the surface of at least the first plurality of V groove portions 20A, the second plurality of V groove portions 20B, the first plurality of extension groove bottom portions 30A, and the second plurality of extension groove bottom portions 30B of the substrate 10 is black. You may paint.

  The black body plate manufactured as described above is attached to, for example, a base plate 50 as an attachment interface together with a frame (not shown), and is further placed at a predetermined position of an infrared radiation measuring device (not shown). Installed.

[Infrared radiation measurement equipment]
The infrared radiation measuring apparatus according to the present embodiment is an SGLI mounted on the GCOM-C satellite, as in the first embodiment.

  This infrared radiation measuring apparatus has the black body plate shown in FIG. 2, an infrared imaging device, and an infrared path switching unit.

  The infrared path switching unit includes an infrared path facing the ground as a measurement target, an infrared path facing the deep space as the first black body radiation source, and an infrared path facing the black body plate as the second black body radiation source. And switch.

  In this SGLI, in order to improve the observation accuracy, a deep space (approximately 4K low-temperature blackbody) as a first blackbody radiation source and a blackbody plate (approximately 300K (Kelvin) as a second blackbody radiation source). ), A two-point calibration is performed on the satellite orbit. The deep universe as the first blackbody radiation source is stable at a very low temperature (about 4 K (Kelvin)). The black body plate as the second black body radiation source is built in the SGLI and is temperature-controlled at a normal temperature (about 300 K) using a high-accuracy temperature sensor.

  The infrared path switching unit includes, for example, a scanning mirror or a chopper that makes a round at 740 ms (milliseconds), and switches between the first black body radiation source and the second black body radiation source by the infrared imaging device, and performs imaging. Perform circumferential calibration.

  A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

  (Additional remark 1) It provided so that each groove | channel centerline might be perpendicular | vertical with respect to the board surface provided with the flat board surface, and the said board surface of the said board | substrate, and it may be parallel to this board surface without a clearance gap. A plurality of V-groove portions, and a plurality of extension groove bottom portions provided at the respective groove bottom portions of the plurality of V-groove portions, each of the plurality of extension groove bottom portions communicating with each of the plurality of V-groove portions. And a black body plate having a shape bent in a direction intersecting the groove center line.

  (Supplementary Note 2) Each of the plurality of V-groove parts includes a first inclined surface and a second inclined surface on a cross section parallel to the groove center line, and the first inclined surface and the second inclined surface. The surfaces have the same inclination angle with respect to the groove center line, and each of the plurality of extended groove bottoms has the same inclination angle as the second inclined surface on a cross section parallel to the groove center line. The black body plate according to supplementary note 1, including a surface continuous to the two inclined surfaces.

  (Supplementary note 3) The black body plate according to supplementary note 2, wherein each of the first inclined surface and the second inclined surface forms an inclination angle of less than 45 degrees with respect to the groove center line.

  (Supplementary note 4) The black body plate according to supplementary note 3, wherein each of the first inclined surface and the second inclined surface forms an inclination angle of 30 degrees with respect to the groove center line.

  (Supplementary Note 5) The plate surface of the substrate extends in the X direction and the Y direction perpendicular to each other, and the plurality of V-groove portions extend in the X direction and have a predetermined groove width. And a plurality of first V-groove parts arranged in parallel in the Y direction, and a second plurality of V-groove parts extending in the Y direction and arranged in parallel in the X direction with the predetermined groove width. The black body board as described in any one of 1-4.

  (Additional remark 6) The said board | substrate is a black body board as described in any one of additional marks 1-5 which consists of metals.

  (Additional remark 7) The said board | substrate is a black body board of Additional remark 6 which consists of an aluminum alloy, a magnesium alloy, or stainless steel.

  (Appendix 8) The blackening treatment or black coating is applied to the surfaces of at least the plurality of V-groove portions and the plurality of extended groove bottom portions of the substrate according to any one of appendices 1 to 7. Black body board.

  (Supplementary note 9) The black body plate according to any one of supplementary notes 1 to 8 as a blackbody radiation source, an infrared imaging device, and an infrared ray facing a measurement target provided in an incident part of the infrared imaging device An infrared radiation measurement apparatus comprising: an infrared path switching unit that switches a path and an infrared path facing the black body plate.

  (Additional remark 10) It is a manufacturing method of the black body board as described in any one of Additional remarks 1-8, Comprising: The process of forming these V-groove part by the cutting process in the said plate surface of the said board | substrate, and these several Forming the plurality of extended groove bottoms by cutting the V-groove part.

  (Supplementary Note 11) Of the surfaces defining each of the plurality of V-groove portions and the surfaces defining each of the plurality of extended groove bottom portions, at least a surface facing the outside from the groove opening along the groove center line is The black body plate according to any one of appendices 1 to 8, wherein all of the black body plates form an inclination angle of less than 90 degrees with respect to the groove center line on a cross section parallel to the groove center line.

  (Supplementary Note 12) Of the surfaces defining each of the plurality of V-groove portions and the surfaces defining each of the plurality of extended groove bottom portions, at least a surface facing the outside from the groove opening along the groove center line is The black body plate according to appendix 11, wherein all have an inclination angle of less than 45 degrees with respect to the groove center line on a cross section parallel to the groove center line.

  (Supplementary Note 13) Of the surfaces defining each of the plurality of V-groove portions and the surfaces defining each of the plurality of extended groove bottom portions, at least a surface facing the outside from the groove opening along the groove center line is The black body plate according to appendix 12, wherein all of the cross sections are parallel to the groove center line and have an inclination angle of 30 degrees with respect to the groove center line.

  (Additional remark 14) It is an infrared radiation measurement apparatus mounted in a flying body, Comprising: The said infrared path switching part faces the deep space as a 1st black body radiation source and the infrared path which faces the ground as a measuring object The infrared radiation measurement apparatus according to appendix 9, wherein an infrared path and an infrared path facing the black body plate as the second black body radiation source are switched.

  (Supplementary Note 15) In the step of forming the plurality of V-groove parts, a conical cutting blade is cut vertically with respect to the plate surface of the substrate, and cutting is performed. The black body plate manufacturing method according to appendix 10, wherein the plate-shaped cutting blade is cut at an inclination angle of less than 90 degrees with respect to the groove center line.

DESCRIPTION OF SYMBOLS 10 Board | substrate 11 Plate surface 20, 20A, 20B V groove part 21 1st inclined surface 22 2nd inclined surface 30, 30A, 30B Extension groove bottom part 31 Extension inclined surface 50 Base plate

Claims (10)

A substrate with a flat plate surface;
A plurality of V-groove portions provided so that each groove center line is perpendicular to the plate surface of the substrate and parallel to the plate surface without a gap;
A plurality of extended groove bottoms provided at the respective groove bottoms of the plurality of V-groove parts,
Each of the plurality of extended groove bottom portions communicates with each of the plurality of V groove portions and exhibits a shape bent in a direction intersecting the groove center line. Each of the plurality of V-groove parts includes a first inclined surface and a second inclined surface on a cross section parallel to the groove center line,
The first inclined surface and the second inclined surface have the same inclination angle with respect to the groove center line,
2. Each of the plurality of extended groove bottoms includes a surface that is continuous with the second inclined surface at the same inclination angle as the second inclined surface on a cross section parallel to the groove center line. Black body board.   The black body plate according to claim 2, wherein each of the first inclined surface and the second inclined surface forms an inclination angle of less than 45 degrees with respect to the groove center line.   The black body plate according to claim 3, wherein each of the first inclined surface and the second inclined surface forms an inclination angle of 30 degrees with respect to the groove center line. The plate surface of the substrate extends in the X and Y directions perpendicular to each other,
The plurality of V-groove portions are
A plurality of first V-grooves extending in the X direction and parallel to the Y direction with a predetermined groove width;
5. A black body plate according to claim 1, further comprising: a plurality of second V-groove parts extending in the Y direction and parallel in the X direction with the predetermined groove width. .   The black body plate according to claim 1, wherein the substrate is made of metal.   The black body plate according to claim 6, wherein the substrate is made of an aluminum alloy, a magnesium alloy, or stainless steel.   Black body board as described in any one of Claims 1-7 by which the blackening process or the black coating is given to the surface of the said several V-groove part and the said several extension groove bottom part of the said board | substrate. . A black body plate according to any one of claims 1 to 8, as a black body radiation source,
An infrared imager;
An infrared radiation measurement apparatus, comprising: an infrared path switching unit that is provided at an incident part of an infrared imaging device and switches between an infrared path facing a measurement target and an infrared path facing the black body plate. It is a manufacturing method of the black body board according to any one of claims 1 to 8,
Forming the plurality of V-groove portions by cutting on the plate surface of the substrate;
Forming the plurality of extended groove bottoms by cutting the plurality of V-groove parts.

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