CN108801454B - Low temperature radiometer thermal structure - Google Patents
Low temperature radiometer thermal structure Download PDFInfo
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- CN108801454B CN108801454B CN201810505274.4A CN201810505274A CN108801454B CN 108801454 B CN108801454 B CN 108801454B CN 201810505274 A CN201810505274 A CN 201810505274A CN 108801454 B CN108801454 B CN 108801454B
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- 230000008093 supporting effect Effects 0.000 claims abstract description 76
- 239000004642 Polyimide Substances 0.000 claims abstract description 9
- 229920001721 polyimide Polymers 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 11
- 229910052738 indium Inorganic materials 0.000 claims description 7
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 238000013461 design Methods 0.000 abstract description 6
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000002474 experimental method Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 9
- 230000005855 radiation Effects 0.000 description 7
- 238000011160 research Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000077 insect repellent Substances 0.000 description 2
- 229910001094 6061 aluminium alloy Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0403—Mechanical elements; Supports for optical elements; Scanning arrangements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Radiation Pyrometers (AREA)
Abstract
The invention discloses a low-temperature radiometer thermal structure, which adopts a gasket type heat conduction body made of polyimide, wherein the polyimide has an ultralow heat conduction coefficient, and the gasket type heat conduction body has equivalent mechanical supporting stress while meeting the indexes of the response and time constant of heat conductivity to a radiometer, so that a blackbody cavity can be horizontally placed without deformation caused by vibration of a mechanical refrigerator; the clamping parts of the thermal structure elements are designed, the thermal structure elements are connected through screws, and heat conduction at other positions except the outer edge of the heat conduction body is avoided through the design; the thermal structures are connected by screws, so that later-period maintenance and replacement of thermal structure elements are facilitated, and parameters such as sensitivity, time constant, diaphragm aperture and the like of the low-temperature radiometer are adjusted; in addition, the invention also designs a supporting heat sink with a height adjusting function, so that the adjustment and alignment of the optical axis in the later experiment and assembly process are facilitated.
Description
Technical Field
The invention relates to a low-temperature radiometer thermal structure.
Background
The low-temperature radiometer utilizes the electric substitution measurement principle under low-temperature superconduction to trace the light radiation measurement to the electric parameter measurement which can be accurately measured, the light power measurement reference of the light radiation absolute power value is obtained, and the measurement uncertainty reaches 10-5The magnitude is the highest standard for measuring the optical power internationally at present, and plays a fundamental important role in the aspects of optical radiation measurement in national defense and military industry scientific research fields such as high-resolution, earth observation and navigation, guidance and the like.
Since the last 80 s, the united kingdom national physical research institute (NPL), the national measurement standards laboratory (NIST) in the united states, and the german federal physical research institute (PTB), etc. have been working on the development of high-precision radiometric standards for low-temperature radiometers.
Based on the thermal equivalent comparison measurement principle of optical radiation and electric heating in a low-temperature environment, the design of an internal thermal structure is directly related to the measurement accuracy, time constant, sensitivity and other test indexes of a low-temperature radiometer, and is the core and difficulty of the design of the whole instrument.
Generally, the internal thermal structure of a radiometer mainly comprises: the device comprises an aperture diaphragm, a black body absorption cavity, a heat conduction structure, a temperature control heat sink and a related clamping and fixing component.
In the existing research, materials with low thermal conductivity coefficients such as 6061 aluminum, SS304 stainless steel, polyimide and the like are generally adopted as thermal conductive structural materials; in the aspect of the shape of the heat conduction structure, the PMO6 radiometer designed in the world radiation center adopts a mosquito-repellent incense-like heat conduction structure, and the high-precision low-temperature radiometer POWR developed by the US NIST adopts a ring-shaped polyimide material as the heat conduction structure.
The thermal structure is the core of the low-temperature radiometer, wherein the heat conducting structure is a tie connecting the black body absorption cavity and the low-temperature heat sink, and the thermal structure is directly related to indexes such as responsivity, time constant and the like of the radiometer.
According to a responsivity formula and a time constant formula, the two indexes of responsivity and a time constant are mutually restricted, and in the process of designing a thermal structure, the responsivity and the time constant are balanced according to the design indexes to determine the total thermal conductivity; secondly, it is ensured that the whole thermal structure has a considerable supporting effect and is less influenced by the vibration of the mechanical refrigerator.
The main problems of the existing thermal structure are as follows:
(1) the mosquito-repellent incense structure is mainly connected with the outer ring heat sink by low-temperature glue and self gravity, and has insufficient supporting force when applied in the horizontal direction, so that vibration deformation is easy to occur, and the optical axis is displaced; (2) the use of technologies such as seamless welding and the like causes that all parts cannot be disassembled, which is not beneficial to later maintenance and part replacement; (3) the position of the blackbody cavity is not adjustable, which is not beneficial to the alignment of the optical axis.
Disclosure of Invention
Aiming at the technical problems of the conventional low-temperature radiometer thermal structure, the invention provides a low-temperature radiometer thermal structure, which adopts the following technical scheme:
a low-temperature radiometer thermal structure comprises a heat conduction body, a blackbody cavity, a supporting heat sink, a heat conduction body fixing part, an aperture diaphragm and a heat sink base; wherein:
the heat conduction body adopts a circular sheet structure, and the middle part of the heat conduction body is provided with a light through hole;
the outer edges of the two side surfaces of the heat conduction body are respectively provided with a concentric circular ring which protrudes outwards from the side surface;
the heat conducting body and the concentric ring are both made of polyimide materials;
a plurality of screw through holes are formed in the heat conduction body;
the upper part of the supporting heat sink is cylindrical and is horizontally arranged, and one side of the supporting heat sink is provided with an opening;
screw holes are formed in the opening side of the heat sink and corresponding positions of the heat conducting body fixing parts corresponding to the screw through holes;
the diameter of the screw through hole is larger than that of the screw hole;
the heat conduction body is positioned between the opening sides of the heat conduction body fixing part and the supporting heat sink and is fixed by bolts penetrating through the screw holes and the screw through holes, and the heat conduction body is respectively contacted with the heat conduction body fixing part and the supporting heat sink through two concentric rings;
the black body cavity is positioned in the heat sink, the outer side end of the black body cavity is connected with the side wall of the light through hole of the heat conduction body, and the outer side edge of the black body cavity is parallel to one side surface of the heat conduction body close to the outer side;
the lower part of the supporting heat sink is connected with the heat sink base through a bolt; the aperture diaphragm is installed on the heat conduction body fixing part through a bolt.
Preferably, the width of the concentric rings is 1mm and the height is 0.2 mm.
Preferably, the diameter of the screw through hole is 1mm larger than the diameter of the screw hole.
Preferably, the heat sink base is provided with a supporting heat sink clamping component for mounting and supporting a heat sink.
Preferably, the lower part of the supporting heat sink is provided with two supporting vertical plates, and the supporting heat sink clamping parts are provided with two groups;
each supporting heat sink clamping part corresponds to one supporting vertical plate;
the heat sink supporting clamping part comprises a top plate which is vertically placed and at least one bolt seat which is arranged in parallel with the top plate;
a gap for placing the supporting vertical plate is formed between the top plate and the bolt seat; the bolt seat is provided with a bolt hole, the supporting vertical plate is positioned in the corresponding gap, and the supporting vertical plate is tightly propped against the corresponding top plate through a bolt penetrating through the bolt hole.
Preferably, the supporting heat sink, the heat-conducting body fixing part, the aperture diaphragm and the heat sink base are all made of an OFHC high-conductivity oxygen-free copper material.
Preferably, the surface of the OFHC high-conductance oxygen-free copper is polished gold plated and low-temperature vacuum treated.
Preferably, indium sheets are arranged at the joints among the heat conduction body, the supporting heat sink, the heat conduction body fixing part, the aperture diaphragm and the heat sink base.
Preferably, the blackbody cavity is connected with the side wall of the light through hole of the heat conduction body through low-temperature glue.
Preferably, the axis of the blackbody cavity is perpendicular to the side surface of the thermally conductive body.
The invention has the following advantages:
(1) the gasket type heat conduction body made of the polyimide material has an ultralow heat conductivity coefficient, meets the responsivity and time constant index of the heat conductivity to the radiometer, has equivalent mechanical supporting stress, and can meet the requirement that a blackbody cavity is not deformed due to the vibration of a mechanical refrigerator under the horizontal placement condition. (2) The clamping parts of the thermal structure elements are designed, all the thermal structure elements are connected through screws, and heat conduction at other positions except the outer edge of the heat conduction body is avoided through the design, so that the heat leakage phenomenon is avoided; the thermal structures are connected by screws, so that later-stage maintenance and replacement of thermal structure elements are facilitated, and parameters such as sensitivity, time constant, diaphragm aperture and the like of the low-temperature radiometer are adjusted. (3) The supporting heat sink with the height adjustable function is designed, and adjustment and alignment of the optical axis in later-stage experiments and assembling processes are facilitated.
Drawings
FIG. 1 is a schematic view of the thermal structure of a low temperature radiometer of the present invention;
FIG. 2 is a cross-sectional view of a low temperature radiometer thermal structure of the present invention;
FIG. 3 is a schematic structural view of a thermally conductive body according to the present invention;
FIG. 4 is a cross-sectional view of a thermally conductive body of the present invention;
wherein, 1-heat conduction body, 2-screw through hole, 3-blackbody cavity, 4-supporting heat sink, 5-heat conduction body fixing part, 6-aperture diaphragm, 7-heat sink base, 8-bolt, 9-fixing screw;
10-concentric circular ring, 11-supporting vertical plate, 12-top plate, 13-bolt seat, 14-gap and 15-light through hole.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
referring to fig. 1 and 2, a thermal structure of a low-temperature radiometer includes a heat-conducting body 1, a blackbody cavity 3, a supporting heat sink 4, a heat-conducting body fixing part 5, an aperture diaphragm 6, and a heat sink base 7. Wherein:
as shown in fig. 3, the heat conductive body 1 is a circular sheet structure, and a light hole 15 is formed in the middle of the heat conductive body 1.
The outer edges of the two side surfaces of the heat-conducting body 1 are respectively provided with a concentric ring 10 which protrudes outwards from the side surface.
Outward here means vertically outward along a certain side surface of the heat conductive body 1.
The heat-conducting body 1 and the concentric rings 10 are both made of polyimide materials, and the polyimide materials fully meet the requirements of the heat-conducting body 1 on two indexes, namely responsivity and time constant, and have equivalent mechanical support stress.
As shown in fig. 4, the concentric rings 10 in this embodiment have a width of 1mm and a height of 0.2 mm.
A number of screw vias, for example screw vias 2, for example six, are provided on the thermally conductive body 1.
The upper part of the supporting heat sink 4 is cylindrical and horizontally placed, and is opened at one side of the supporting heat sink 4.
Screw holes (not shown) are provided at the opening side of the supporting heat sink 4 and corresponding positions of the heat conductive body fixing part 5 corresponding to the screw passing holes 2; the diameter of the screw through hole 2 is larger than that of the screw hole.
The heat conductive body 1 is located between the heat conductive body fixing part 5 and the opening side supporting the heat sink 4, and is fixed by a bolt passing through the screw hole and the screw passing hole 2.
After fixation, the heat-conducting body 1 is in contact with the heat-conducting body fixation part 5 and the supporting heat sink 4 through two concentric rings 10, respectively.
The heat which is transmitted to the inner side of the heat conduction body 1 through the blackbody cavity 3 can be slowly transmitted to the outer edge of the heat conduction body 1 and transmitted to the supporting heat sink 4 connected with the outer edge of the heat conduction body 1.
In addition, the diameter of the screw through hole 2 is larger than that of the screw hole, so that the heat of the heat conduction body 1 can be prevented from being conducted to the supporting heat sink 4 through the screw (penetrating through the screw through hole), and the radiation heat can be transmitted to the supporting heat sink 4 through the outer edge of the heat conduction body 1.
The embodiment avoids heat conduction at other positions except the outer edge of the heat conduction body 1, and avoids heat leakage.
The diameter of the screw through hole 2 in this embodiment is 1mm larger than the diameter of the screw hole.
This embodiment is through designing for bolted connection between heat conduction body 1, the support heat sink 4 and the heat conduction body fixed part 5, is convenient for change heat conduction body 1 through dismantling the screw.
The black body cavity 3 is positioned inside the supporting heat sink 4, the outer side end of the black body cavity 3 is connected with the light through hole side wall of the heat conducting body 1, and the outer side edge of the black body cavity 3 is parallel to one side surface of the heat conducting body, which is positioned outwards.
Preferably, the blackbody cavity 3 is connected with the light-transmitting hole side wall of the heat-conducting body 1 through low-temperature glue. The light radiation heat can only be conducted to the supporting heat sink 4 through the outer edge of the heat conducting body 1 without other heat conduction paths.
When the blackbody cavity 3 is connected with the heat conducting body 1, the axis of the blackbody cavity 3 is required to be perpendicular to the side surface of the heat conducting body 1, so that the axis of the blackbody cavity 3 can be adjusted to be consistent with the incident light axis later.
The aperture diaphragm 6 is mounted on the heat conductive body fixing member 5 by bolts.
Specifically, the aperture stop 6 in the present embodiment may be fixed to the heat conductive body fixing member 5 by six screws, for example. The aperture diaphragm 6 can be replaced by removing six screws.
The lower part of the supporting heat sink 4 is connected with a heat sink base 7 through bolts. Specifically, a supporting heat sink holding member for mounting the supporting heat sink 4 is provided on the heat sink base 7.
The structural form of the heat sink clamping component is various, and the embodiment is a better structure.
The lower part of the supporting heat sink 4 has two supporting vertical plates, such as supporting vertical plates 11, and there are two groups of supporting heat sink clamping parts. Each supporting heat sink clamping member corresponds to one supporting vertical plate.
The description will be given by taking one group of supporting heat sink clamping components as an example:
the supporting heat sink clamping member includes a top plate 12 that is vertically disposed and at least one bolt seat 13 that is arranged parallel to the top plate.
In fig. 1 three bolt seats 13 are shown parallel to the top plate 12, which is, of course, merely exemplary.
A gap 14 for placing a supporting vertical plate is formed between the top plate 12 and the bolt seat 13.
Bolt holes (not shown) are provided in the bolt seats 13, and the supporting vertical plates 11 are located in the corresponding gaps 14 and are pressed against the corresponding top plates 12 by bolts 8 passing through the bolt holes.
The supporting heat sink clamping member of such a structure can achieve the connection of the supporting heat sink 4 with the heat sink base 7. In addition, because the height of supporting the heat sink in the embodiment can be finely adjusted, the adjustment and alignment of the optical axis in later-stage experiments and assembling processes are facilitated.
Preferably, the supporting heat sink 4, the heat-conducting body fixing part 5, the aperture diaphragm 6, the heat sink base 7 and the like in the present embodiment are all made of OFHC high-conductivity oxygen-free copper material.
The surface of the OFHC high-conductivity oxygen-free copper is subjected to polishing gold plating and low-temperature vacuum treatment, so that the vacuum environment of the low-temperature radiometer can be prevented from being influenced by air leakage of a thermal structure in an ultralow-temperature vacuum environment.
In addition, indium sheets (not shown) are also arranged at the joints among the components of the thermal structure to ensure good heat conduction effect.
Because all parts in the thermal structure are connected through screws, the thermal structure elements are convenient to maintain and replace in the later period, and the parameters such as the sensitivity, the time constant, the aperture of the diaphragm and the like of the low-temperature radiometer are adjusted.
Of course, the above-described bolt connection may also be satisfactory for the mechanical stability of the thermal structure.
The heat sink base 7 is matched with the bottom detector mounting seat through a fixing screw 9 at the bottom of the heat sink base.
The assembly process of the thermal structure of the low-temperature radiometer comprises the following steps:
the specific implementation process of the assembly adjustment of the direct-connected thermal structure of the low-temperature radiometer is described in the following with reference to the attached figure 2:
firstly, the outer side edge of the blackbody cavity 3 is matched with the clamping groove at the inner ring of the heat conduction body 1, and the matching part is bonded by low-temperature glue, so that the axis of the blackbody cavity 3 is ensured to be vertical to the surface of the heat conduction body 1, and later-period light path adjustment is facilitated.
Secondly, the black body cavity 3 after the matching is completed is inserted into the supporting heat sink 4, the heat conduction body 1 and the black body cavity 3 are fixed at the opening of the supporting heat sink 4 through the heat conduction body fixing part 5 and screws, and indium sheets are required to be padded at the matching positions.
In the matching process, the six screws are ensured to pass through the centers of the six screw through holes 2 in the heat conduction body 1 and not to be in contact with the heat conduction body 1 and the indium sheet, and the heat is prevented from being conducted to a heat sink through the screws.
Then, the cooperation between the heat sink base 7 and the three-stage cold shield detector mounting base is performed.
The direction of the clamping groove for adjusting the heat sink base 7 before matching is consistent with the direction of the light through hole of the cold shield, 9 heat sink base fixing screws are used for matching, and indium pads are needed at the matching position.
And finally, matching the matched supporting heat sink 4 with the heat sink base 7 along the gap on the heat sink base 7, and padding an indium sheet at the matching position. Before matching, the height and the levelness of the supporting heat sink 4 are firstly finely adjusted to ensure that the axis of the black body cavity is consistent with the axis of incident light, and then the screw 8 of the thermal structure is fixed to complete the matching of the whole thermal structure.
It should be understood, however, that the description herein of specific embodiments is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A low-temperature radiometer thermal structure is characterized by comprising a heat conduction body, a blackbody cavity, a supporting heat sink, a heat conduction body fixing part, an aperture diaphragm and a heat sink base; wherein:
the heat conduction body adopts a circular sheet structure, and the middle part of the heat conduction body is provided with a light through hole;
the outer edges of the two side surfaces of the heat conduction body are respectively provided with a concentric circular ring which protrudes outwards from the side surface;
the heat conducting body and the concentric ring are both made of polyimide materials;
a plurality of screw through holes are formed in the heat conduction body;
the upper part of the supporting heat sink is cylindrical and is horizontally arranged, and one side of the supporting heat sink is provided with an opening;
screw holes are formed in the opening side of the heat sink and corresponding positions of the heat conducting body fixing parts corresponding to the screw through holes;
the diameter of the screw through hole is larger than that of the screw hole;
the heat conduction body is positioned between the opening sides of the heat conduction body fixing part and the supporting heat sink and is fixed by bolts penetrating through the screw holes and the screw through holes, and the heat conduction body is respectively contacted with the heat conduction body fixing part and the supporting heat sink through two concentric rings;
the black body cavity is positioned in the heat sink, the outer side end of the black body cavity is connected with the side wall of the light through hole of the heat conduction body, and the outer side edge of the black body cavity is parallel to one side surface of the heat conduction body close to the outer side;
the lower part of the supporting heat sink is connected with the heat sink base through a bolt; the aperture diaphragm is arranged on the heat conduction body fixing part through a bolt;
a supporting heat sink clamping component for mounting and supporting a heat sink is arranged on the heat sink base;
the lower part of the supporting heat sink is provided with two supporting vertical plates, and two groups of supporting heat sink clamping components are arranged;
each supporting heat sink clamping part corresponds to one supporting vertical plate;
the heat sink supporting clamping part comprises a top plate which is vertically placed and at least one bolt seat which is arranged in parallel with the top plate;
a gap for placing the supporting vertical plate is formed between the top plate and the bolt seat; the bolt seat is provided with a bolt hole, the supporting vertical plate is positioned in the corresponding gap, and the supporting vertical plate is tightly propped against the corresponding top plate through a bolt penetrating through the bolt hole.
2. A cryogenic radiometer thermal structure according to claim 1, wherein the concentric rings are 1mm wide and 0.2mm high.
3. A cryogenic radiometer thermal structure of claim 1, wherein the screw holes have a diameter 1mm larger than the diameter of the screw holes.
4. A low temperature radiometer thermal structure according to claim 1, wherein the supporting heat sink, the thermally conductive body fixing part, the aperture stop and the heat sink base are made of OFHC high-conductivity oxygen-free copper material.
5. A low temperature radiometer thermal structure according to claim 4, wherein the OFHC high-conductivity oxygen-free copper surface is polished gold plated and low temperature vacuum treated.
6. A low temperature radiometer thermal structure of claim 1, wherein the junction between the heat conducting body, the supporting heat sink, the heat conducting body fixing part, the aperture stop and the heat sink base is provided with indium plate.
7. A cryogenic radiometer thermal structure of claim 1, wherein the blackbody cavity is connected to the clear aperture sidewall of the thermally conductive body by a cryogenic glue.
8. A cryogenic radiometer thermal structure of claims 1 or 7, wherein the axis of the blackbody cavity is perpendicular to the side surface of the thermally conductive body.
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| CN201810505274.4A CN108801454B (en) | 2018-05-24 | 2018-05-24 | Low temperature radiometer thermal structure |
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| CN110118597B (en) * | 2019-04-26 | 2020-08-21 | 中国科学院长春光学精密机械与物理研究所 | Solar radiation score split type heat sink structure |
| CN115165090B (en) * | 2022-08-05 | 2024-09-06 | 中国科学院长春光学精密机械与物理研究所 | Optical power measuring circuit of ultra-high precision space low-temperature absolute radiometer |
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| CN106370312B (en) * | 2016-08-16 | 2019-02-15 | 中国科学院长春光学精密机械与物理研究所 | The measurement method of absolute radiometer and absolute radiometer spatial context radiant heat transfer |
| CN106768372B (en) * | 2016-11-14 | 2019-04-30 | 中国电子科技集团公司第四十一研究所 | A kind of low temperature radiometer blackbody chamber |
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