High-temperature blackbody radiation source for spectrum calibration

Abstract

The invention discloses a high-temperature blackbody radiation source for spectrum calibration, and relates to the technical field of satellite-borne blackbodies, the high-temperature blackbody radiation source comprises a blackbody, a heating device and a heat insulation device, the blackbody is made of an inorganic material; the heating device is configured to heat the black body; the heat insulation device is provided with an inner cavity, the black body is arranged in the inner cavity, and the heat insulation device is provided with an incident port corresponding to the black body. According to the high-temperature blackbody radiation source for spectrum calibration, the blackbody is made of the inorganic material, organic matter deflation pollution does not exist at the high temperature, the risk of organic matter deflation pollution is further reduced, heat insulation is conducted on the blackbody through the heat insulation device, and it is avoided that the performance of surrounding instruments is affected by the high temperature of the blackbody.

Description

Technical Field

[0001] The invention relates to the technical field of satellite-borne black bodies, and in particular to a high-temperature black body radiation source used for spectral calibration. Background Art

[0002] After the satellite-borne infrared camera is launched into orbit, its performance will change due to the influence of factors such as the space environment and its own aging. In addition, the response non-uniformity of each detection element of the satellite-borne infrared camera and its change over time will affect the imaging quality. If the on-orbit radiation calibration is not performed, the image application will be affected. On-orbit calibration usually uses spectral calibration and uses the satellite-borne black body as the radiation source to calibrate it on the satellite.

[0003] The inventors of the present application have discovered that, under high temperature conditions, the blackbody radiation source in the prior art has the risk of organic outgassing contamination, and the high temperature of the blackbody radiation source can cause drastic changes in the surrounding infrared radiation field, thereby affecting the performance of surrounding instruments. Summary of the invention

[0004] The purpose of the present invention is to provide a high-temperature blackbody radiation source for spectral calibration to solve the problems existing in the above-mentioned prior art, reduce the risk of organic outgassing pollution, and reduce the impact on surrounding instruments.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a high-temperature blackbody radiation source for spectral calibration, comprising:

[0007] Black bodies, made of inorganic materials;

[0008] A heating device, configured to heat the black body;

[0009] The heat insulation device comprises an inner cavity, the black body is arranged in the inner cavity, and the heat insulation device is provided with an incident port corresponding to the black body.

[0010] Preferably, the heating device comprises a plurality of heating rods, and the heating rods are fixed to the black body via fixing members, and the fixing members are made of inorganic materials.

[0011] Preferably, the outer wall of the black body is provided with a plurality of receiving grooves, the heating rod is arranged in the receiving grooves, the fixing member is a spring sheet, the spring sheet spans the notch of the receiving groove and can press and fix the heating rod in the receiving groove, and the spring sheet is fixedly connected to the black body by screws or bolts.

[0012] Preferably, the heat insulation device includes multiple layers of metal thin walls and two outer baffles, and the multiple layers of metal thin walls are nested in sequence, and there is an annular gap between two adjacent layers of the metal thin walls. Each of the annular gaps is provided with an annular connecting ring to connect the metal thin walls on both sides thereof, and the connecting ring is also a thin-walled structure. The two outer baffles are covered at both ends of the metal thin walls, and the two outer baffles are only fixedly connected to the outermost layer of the metal thin walls. The space enclosed by the innermost layer of the metal thin walls is the inner cavity, and the incident port is provided on one of the outer baffles, and the incident port is facing the cavity inside the black body.

[0013] Preferably, a connecting ring is provided at the upper and lower parts of each of the annular spacers, a plurality of the connecting rings at the upper part are staggered along the axial direction, and a plurality of the connecting rings at the lower part are staggered along the axial direction.

[0014] Preferably, the black body is fixedly arranged in the metal thin wall through a supporting tube, and the supporting tube is nested in the innermost metal thin wall. There is a gap between the supporting tube and the innermost metal thin wall, and one end of the innermost metal thin wall is fixedly covered with a first inner baffle plate, one end of the supporting tube is fixedly connected to the first inner baffle plate, the black body is arranged in the supporting tube, and the other end of the supporting tube is fixedly connected to the black body.

[0015] Preferably, a plurality of holes are evenly arranged on the support tube.

[0016] Preferably, a second inner shielding plate is provided at one end of the metal thin wall away from the first inner shielding plate, the second inner shielding plate is located on the inner side of the outer shielding plate, the second inner shielding plate is fixedly connected to the two inner metal thin walls and covers the end of the innermost metal thin wall.

[0017] Preferably, a heat insulating pad is provided between the support tube and the first inner shielding plate.

[0018] Preferably, a temperature measuring element is provided on the black body, and corresponding wire holes are provided on an inner shielding plate and an outer shielding plate, and the inner shielding plate is the first inner shielding plate or the second inner shielding plate.

[0019] Compared with the prior art, the present invention has achieved the following technical effects:

[0020] The black body in the high-temperature black body radiation source for spectral calibration provided by the present invention is made of inorganic materials, and there is no organic outgassing pollution at high temperatures, thereby reducing the risk of organic outgassing pollution. In addition, a heat insulation device is provided to insulate the black body to prevent its high temperature from affecting the performance of surrounding instruments.

[0021] Furthermore, the present invention fixes the heating rod by using a spring piece made of an inorganic material, abandoning the existing method of fixing by bonding with an organic adhesive, thereby further reducing the risk of organic outgassing pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a high-temperature blackbody radiation source for spectral calibration provided by an embodiment of the present invention;

[0024] Figure 2 for Figure 1 The structural diagram of the other side;

[0025] Figure 3 for Figure 2 A top view of

[0026] Figure 4 for Figure 3 Middle AA section view;

[0027] Figure 5 It is a schematic diagram of the structure of the support tube and the black body inside it;

[0028] Figure 6 It is a structural schematic diagram of the support tube;

[0029] Figure 7 It is a schematic diagram of the structure of the black body;

[0030] Figure 8 This is a schematic diagram of the structure of using a spring to fix the heating rod on the black body;

[0031] Fig. 9 A schematic diagram of a structure in which a fixed support is used to support a heating rod;

[0032] Fig.10 for Fig. 9 A schematic diagram of the structure after removing two fixed supports;

[0033] Fig.11 It is a schematic diagram of the structure after the mounting plate is arranged at the second end of the black body;

[0034] Fig.12 is a structural schematic diagram of a connecting ring;

[0035] In the figure: 1-insulation device; 2-inlet; 3-wire hole; 4-external interface; 5-metal thin wall; 6-connecting ring; 7-second inner baffle plate; 8-first inner baffle plate; 9-insulation pad; 10-cavity; 11-support tube; 12-outer baffle plate; 15-black body; 16-heating rod; 17-mounting plate; 18-raised structure; 20-fixed support. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] The present invention provides a high temperature black body radiation source for spectral calibration, such as Figures 1 to 12 As shown, it is suitable for calibrating infrared cameras on satellites. The present invention can also be called a pollution-free high-temperature cavity blackbody radiation source for on-board spectrum calibration, which includes: a blackbody 15, a heating device and a heat insulation device 1.

[0039] The black body 15 is made of an inorganic material, preferably a metal material, and its inner wall is coated with a black inorganic pigment.

[0040] The heating device is configured to heat the black body 15 , and is typically an electric heating device.

[0041] The heat insulation device 1 has an inner cavity, and a black body 15 is arranged in the inner cavity. An incident port 2 corresponding to the black body 15 is arranged on the heat insulation device 1 , and infrared rays of the infrared camera are input into the black body 15 through the incident port 2 .

[0042] The black body 15 in the high-temperature black body radiation source for spectral calibration provided by the present invention is made of inorganic materials, and there is no organic outgassing pollution at high temperatures, thereby reducing the risk of organic outgassing pollution. The black body 15 is insulated by providing an insulation device 1 to prevent its high temperature from affecting the performance of surrounding instruments.

[0043] In some embodiments, the heating device includes a plurality of heating rods 16, such as Figure 7 As shown, preferably four, the heating rods 16 are fixed to the black body 15 through fixing parts, and the fixing parts are made of inorganic materials.

[0044] Specifically, the outer wall of the black body 15 is provided with a plurality of receiving grooves, the heating rod 16 is arranged in the receiving grooves, and the fixing part is a spring clip, which is preferably a metal spring clip. The spring clip spans the notch of the receiving groove and can press and fix the heating rod 16 in the receiving groove. The spring clip is fixedly connected to the black body 15 by screws or bolts. It can be understood that threaded holes are provided on the outer wall of the black body 15 on both sides of the receiving grooves.

[0045] This embodiment fixes the heating rod 16 by using a spring piece made of an inorganic material, abandoning the existing method of fixing by bonding with an organic adhesive, thereby further reducing the risk of organic outgassing pollution.

[0046] In addition to the above specific embodiments, the fixing member may also be a metal strip to tie the heating rod 16 to the black body 15 .

[0047] In some embodiments, the black body 15 is a cylindrical structure, and the cavity 10 therein is also cylindrical. The cavity 10 extends from the first end of the black body 15 toward the second end, and one end of the accommodating groove extends to the end surface of the second end of the black body 15. A fixed support member 20 is provided on the end surface of the second end of the black body 15 to support the end of the heating rod 16.

[0048] In some embodiments, the thermal insulation device 1 includes multiple layers of metal thin walls 5 and two outer baffles 12. The multiple layers of metal thin walls 5 are nested in sequence, and there is an annular gap between two adjacent layers of metal thin walls 5. Each annular gap is provided with an annular connecting ring 6 to connect the metal thin walls 5 on both sides thereof. The connecting ring 6 is also a thin-walled structure. The two outer baffles 12 are covered at both ends of the metal thin walls 5. The two outer baffles 12 are only fixedly connected to the outermost metal thin walls 5. The space enclosed by the innermost metal thin walls 5 is an inner cavity, and an incident port 2 is provided on one of the outer baffles 12, and the incident port 2 faces the cavity 10 in the black body 15.

[0049] The thermal insulation device 1 provided in this embodiment is provided with multiple layers of metal thin walls 5 to insulate the black body 15, and adjacent metal thin walls 5 are connected by connecting rings 6 of a thin-wall structure to reduce the heat conduction path between adjacent metal thin walls 5, thereby reducing the speed of heat transfer to the outside.

[0050] In order to avoid pollution to the space environment and realize a pollution-free high-temperature blackbody radiation source for spectral calibration, the blackbody 15 in the embodiment of the present invention is preferably made of aluminum alloy, and the metal thin wall 5 is made of stainless steel. The metal material selected in the embodiment of the present invention can also adapt to the complex external environment in space.

[0051] In some embodiments, the thickness of the metal thin wall 5 is 0.05 mm to 3 mm.

[0052] In some embodiments, a connecting ring 6 is disposed at the upper and lower parts of each annular spacer, a plurality of upper connecting rings 6 are staggered along the axial direction, and a plurality of lower connecting rings 6 are staggered along the axial direction.

[0053] This embodiment further lengthens the heat conduction path, thereby reducing its heat output.

[0054] In some embodiments, a plurality of protrusion structures 18 are provided on the inner edge and / or outer edge of the connection ring 6, and are fixedly connected to the metal thin wall 5 through the protrusion structures 18, thereby reducing the width of part of the heat conduction path and further reducing its heat output.

[0055] like Fig.12 As shown, the connecting ring 6 and the metal thin wall 5 can be fixedly connected or integrally formed by a welding process, and the welding process can specifically be spot welding.

[0056] In some embodiments, the black body 15 is fixedly disposed in the metal thin wall 5 through a support tube 11. The support tube 11 is nested in the innermost metal thin wall 5. There is a gap between the support tube 11 and the innermost metal thin wall 5. One end of the innermost metal thin wall 5 is fixedly covered with a first inner baffle plate 8. One end of the support tube 11 is fixedly connected to the first inner baffle plate 8. The black body 15 is disposed in the support tube 11, and the other end of the support tube 11 is fixedly connected to the black body 15.

[0057] This embodiment further extends the heat conduction path, and the heat on the black body 15 needs to be transferred from one end of the support tube 11 to the other end before it can be conducted to the metal thin wall 5.

[0058] In some embodiments, a plurality of holes are evenly disposed on the support tube 11 .

[0059] This embodiment further reduces the heat conduction path, thereby reducing its heat output.

[0060] In some embodiments, a second inner baffle plate 7 is provided at one end of the metal thin wall 5 away from the first inner baffle plate 8. The second inner baffle plate 7 is located on the inner side of the outer baffle plate 12. The second inner baffle plate is fixedly connected to the two inner metal thin walls 5 and covers the end of the innermost metal thin wall 5.

[0061] In this embodiment, two layers of shielding plates are provided at both ends of the black body 15 to reduce its heat output.

[0062] In some embodiments, a heat insulating pad 9 is provided between the support tube 11 and the first inner shielding plate 8 .

[0063] In some embodiments, a temperature measuring element is disposed on the black body 15 , and corresponding wire holes 3 are disposed on an inner shielding plate and an outer shielding plate 12 , and an inner shielding plate is a first inner shielding plate 8 or a second inner shielding plate 7 .

[0064] In some embodiments, the temperature measuring element is arranged at the second end of the black body 15, and two temperature measuring elements are arranged. A mounting hole is opened on the second end surface of the black body 15, and then the temperature measuring element is placed in the mounting hole. A mounting plate 17 is detachably connected to the second end of the black body 15 by screws. The temperature measuring element is pressed and fixed in the mounting hole of the black body 15 by the mounting plate 17. The mounting plate 17 is made of aluminum alloy. Therefore, the installation method of the temperature measuring element will not introduce organic matter, thereby further reducing organic outgassing pollution.

[0065] In some embodiments, the thermal insulation device 1 is installed on other equipment, such as an infrared camera, through the external interface 4 .

[0066] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A high temperature black body radiation source for spectral calibration, characterized in that: include: Black bodies, made of inorganic materials; A heating device, configured to heat the black body; The heat insulation device comprises an inner cavity, the black body is arranged in the inner cavity, and the heat insulation device is provided with an incident port corresponding to the black body.

2. The high temperature black body radiation source for spectral calibration according to claim 1, characterized in that: The heating device comprises a plurality of heating rods, and the heating rods are fixed on the black body through fixing parts, and the fixing parts are made of inorganic materials.

3. The high temperature black body radiation source for spectral calibration according to claim 2, characterized in that: The outer wall of the black body is provided with a plurality of receiving grooves, the heating rod is arranged in the receiving grooves, the fixing member is a spring sheet, the spring sheet spans the notch of the receiving groove and can press and fix the heating rod in the receiving groove, and the spring sheet is fixedly connected to the black body by screws or bolts.

4. The high temperature black body radiation source for spectral calibration according to claim 1, characterized in that: The heat insulation device includes multiple layers of metal thin walls and two outer shielding plates. The multiple layers of metal thin walls are nested in sequence, and there is an annular gap between two adjacent layers of the metal thin walls. Each of the annular gaps is provided with an annular connecting ring to connect the metal thin walls on both sides thereof, and the connecting ring is also a thin-walled structure. The two outer shielding plates are covered at both ends of the metal thin walls, and the two outer shielding plates are only fixedly connected to the outermost layer of the metal thin walls. The space enclosed by the innermost layer of the metal thin walls is the inner cavity, and the incident port is provided on one of the outer shielding plates, and the incident port faces the cavity in the black body.

5. The high temperature black body radiation source for spectral calibration according to claim 4, characterized in that: A connecting ring is disposed at the upper and lower parts of each annular spacer, and a plurality of the upper connecting rings are staggered along the axial direction, and a plurality of the lower connecting rings are staggered along the axial direction.

6. The high temperature black body radiation source for spectral calibration according to claim 4, characterized in that: The black body is fixedly arranged in the metal thin wall through a supporting tube, and the supporting tube is nested in the innermost metal thin wall. There is a gap between the supporting tube and the innermost metal thin wall, and one end of the innermost metal thin wall is fixedly covered with a first inner baffle plate, one end of the supporting tube is fixedly connected to the first inner baffle plate, the black body is arranged in the supporting tube, and the other end of the supporting tube is fixedly connected to the black body.

7. The high temperature black body radiation source for spectral calibration according to claim 6, characterized in that: A plurality of holes are evenly arranged on the support tube.

8. The high temperature black body radiation source for spectral calibration according to claim 6, characterized in that: A second inner shielding plate is provided at one end of the metal thin wall away from the first inner shielding plate, and the second inner shielding plate is located on the inner side of the outer shielding plate. The second inner shielding plate is fixedly connected to the two inner metal thin walls and covers the end of the innermost metal thin wall.

9. The high temperature black body radiation source for spectral calibration according to claim 6, characterized in that: A heat insulation pad is arranged between the support tube and the first inner shielding plate.

10. The high temperature black body radiation source for spectral calibration according to claim 8, characterized in that: A temperature measuring element is arranged on the black body, and corresponding wire holes are arranged on an inner shielding plate and an outer shielding plate, and the inner shielding plate is the first inner shielding plate or the second inner shielding plate.

Images