A small surface blackbody radiation source with a wide temperature range

Abstract

The present invention discloses a small-sized surface source blackbody radiation source with a wide temperature range, including an outer shell, an inner shell, a radiation outlet, a heat preservation layer, a heating body, a heating rod, a temperature detector, a heat dissipation device, a set screw, a connecting screw, and a lead connector; the heating rod and the temperature detector are buried in the heating body, the heating body is made of high temperature resistant material, and the radiation surface is a radiation surface made by a special process; a heat preservation layer is installed between the heating body and the inner shell; the outer shell and the inner shell are suspended in the air, and the four edges of the inner shell rectangular body are connected and fixed to the outer shell by insulating high temperature resistant connectors, so that the radiation surface of the heating body is separated from the outer shell surface by a certain distance; the heat dissipation device is installed at the position opposite to the outer shell and the radiation surface. The various parts and installation connection methods of the present invention can be used in conjunction with a temperature controller to realize a miniaturized surface source blackbody radiation source with the advantages of wide temperature radiation, rapid temperature rise and fall, and high emissivity.

Description

Technical Field

[0001] The present invention belongs to the technical field of surface source blackbody radiation sources, and relates to a surface source blackbody, and in particular to a small surface source blackbody radiation source suitable for a wide temperature range from room temperature to high temperature, which can be conveniently applied to infrared radiation measurement, infrared temperature calibration, infrared target or scene output radiation source, etc. Background Art

[0002] With the rapid development of infrared technology, blackbody radiation sources have important applications in remote sensing, temperature measurement, infrared radiation and other fields. Surface source blackbodies are used as calibration devices for infrared imaging devices and can also be used as radiation sources in infrared target simulators. Not only are there high requirements for the emissivity, stability and accuracy of surface source blackbodies, but also higher requirements for the temperature range.

[0003] In addition to high emissivity, high stability and high precision, the surface blackbody radiation source used in the indoor semi-physical simulation system also needs to have good temperature uniformity and a small volume, and the ability to maintain normal operation and reliability under vibration conditions to meet the requirements of the infrared target simulator for opening area, radiation temperature, reliability and volume. Summary of the invention

[0004] (I) Purpose of the invention

[0005] The purpose of the present invention is to provide a small-sized surface blackbody radiation source with a wide temperature range, which can simultaneously provide a temperature range from room temperature to medium-high temperature (25°C-800°C) and a large area relative to the volume (such as an overall volume of 130mm×130mm×100mm with an effective radiation surface of 70mm×70mm, or an overall volume of 90mm×90mm×90mm with an effective radiation surface of 30mm×30mm). The heat target surface radiation source has the advantages of fast heating and cooling speed, wide radiation emission temperature range, stable temperature, high emissivity, small size, light weight and safety, and is widely used in various infrared target detection, tracking, seeker guidance, infrared target simulator, thermal imaging equipment calibration, infrared radiation characteristic testing and other fields.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the present invention provides a small surface source blackbody radiation source with a wide temperature range, which includes an outer shell 1, an inner shell 2, a radiation outlet 3, a thermal insulation layer 4, a heating body 5, a heating rod 6, a temperature detector 7, a heat dissipation device 8, and a connecting screw 10; the heating rod 6 and the temperature detector 7 are buried in the heating body 5, and the heating body 5 is made of high-temperature resistant material; the thermal insulation layer 4 is installed between the heating body 5 and the inner shell 2; the radiation outlet 3 is fixed on the inner shell 2 and does not directly contact the radiation surface of the heating body 5; the outer shell 1 and the inner shell 2 are suspended, and the four edges of the inner shell 2 are connected and fixed to the outer shell 1 by insulating high-temperature resistant connecting screws 10; the heat dissipation device 8 is installed at a position opposite to the radiation surface of the outer shell 1.

[0008] (III) Beneficial effects

[0009] The small-sized surface blackbody radiation source with a wide temperature range provided by the above technical solution has the following advantages:

[0010] The high temperature resistant metal material 310s stainless steel or TC19 titanium alloy can withstand high temperatures above 1200°C and can continuously withstand high temperatures at 1000°C. At the same time, because the heating body is small in size, its thermal conductivity and conduction speed can fully meet the design and use requirements; the special process treatment of the radiation surface of the heating body can effectively improve the emissivity and temperature uniformity of the radiation source; the outer shell and the inner shell are suspended in the air, and the relatively stagnant air layer in the middle serves as a heat preservation medium. It is not only simpler and more convenient to install and saves costs, but also has better heat preservation. When rapid cooling is required, the cooling fan can be started; the outer shell and the inner shell are fixed by a connector wrapped with an insulating high temperature resistant sleeve, which ensures the reliability and safety of the black body radiation source; therefore, the surface source black body radiation source disclosed in the present invention can provide a high emissivity and wide temperature range radiation temperature in the range of room temperature to 800°C under the requirement of miniaturization, so that the black body radiation source can adapt to more types of instrument applications, thereby improving the technical indicators of equipment or tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of the axial longitudinal section of a small-sized surface source blackbody radiation source with a wide temperature range disclosed in the present invention.

[0012] Figure 2 It is a rear view of the small-sized surface blackbody radiation source with a wide temperature range disclosed by the present invention and a cross-sectional view of the connection between the inner shell and the outer shell.

[0013] Among them, 1 is the outer shell, 2 is the inner shell, 3 is the radiation outlet, 4 is the insulation layer, 5 is the heating body, 6 is the heating rod, 7 is the temperature detector, 8 is the heat dissipation device, 9 is the fastening screw, 10 is the connecting screw, and 11 is the lead connector. DETAILED DESCRIPTION

[0014] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples.

[0015] The core of this embodiment is to provide a small surface source blackbody radiation source with a wide temperature range, which can provide surface source radiation with a wide temperature range in a relatively small volume.

[0016] Reference Figure 1 and attached Figure 2 The small-sized surface blackbody radiation source with a wide temperature range in this embodiment comprises an outer shell 1, an inner shell 2, a radiation outlet 3, a heat preservation layer 4, a heating body 5, a heating rod 6, a temperature detector 7, a heat sink 8, a set screw 9, a connecting screw 10, and a lead connector 11; the heating rod 6 and the temperature detector 7 are buried in the heating body 5, the heating body 5 is made of a high-temperature resistant material, and the radiation surface is a radiation surface made by a special process; a heat preservation layer 4 is installed between the heating body 5 and the inner shell 2, and the heat preservation layer 4 can be heat preservation cotton or other heat preservation materials; the radiation outlet 3 is fixed on the inner shell 2 and does not directly contact the radiation surface of the heating body 5; the outer shell 1 and the inner shell 2 are suspended in the air, and the four edges of the inner shell 2 rectangular parallelepiped are connected and fixed to the outer shell 1 by insulating high-temperature resistant connecting screws 10; the heat sink 8 is installed at a position opposite to the radiation surface of the outer shell 1, and the heat sink is preferably a thin fan slightly smaller than the outer shell.

[0017] Since the radiation temperature of the small surface source blackbody radiation source is relatively high, the heating body 5 is made of high temperature resistant material 310s stainless steel or TC19 titanium alloy, preferably 310s stainless steel to improve cost performance and reduce processing difficulty. The heating rods 6 embedded in the heating body 5 are preferably an even multiple of two in a group, and are evenly distributed inside the heating body 5. The heating rods 6 are radially parallel to the radiation surface of the heating body 5 to ensure that the temperature of the heating body is uniform and the temperature rises rapidly. At the same time, in order to ensure the reliability and service life of the heating rod 6 at high temperatures, the heating rod 6 is a single-head electric heating tube with a heating wire preferably a nickel-chromium wire heating wire and a shell of 316 stainless steel. The gap between the heating rod 6 and the heating body 5 is filled with a thin layer of magnesium oxide, which can effectively conduct the heat of the heating rod to the heating body when heating.

[0018] Those skilled in the art will appreciate that the heating rod inside the heating body can be fixed in the inner hole of the heating body 5 in a variety of ways, such as by pressing a buckle plate in the inner hole of the heating body 5, or by passing a screw through the side or back of the heating body to fix it in the inner hole. In this embodiment, threaded holes are preferably drilled on both sides of the heating body, and the heating rod is fastened in the inner hole of the heating body 5 by a set screw.

[0019] The heating body 5 is perforated with one or more temperature detectors 7 embedded therein. The temperature detectors 7 are located in deep holes between two heating rods 6 in a group. The gaps between the holes are filled with a thin layer of magnesium oxide and are fixed at the hole exits with screws or nuts.

[0020] In order to improve the emissivity of the radiation surface of the heating body 5, the radiation surface of the heating body 5 of this embodiment adopts a sandblasting process, and the sandblasting particle size can be in the range of 40 to 80 meshes, and the preferred sandblasting particle size is 60 meshes. After the sandblasting, a layer of high-temperature resistant infrared radiation coating layer is applied, and the preferred infrared radiation coating model is ZS-1061, which can withstand a high temperature of up to 1800°C. The coating layer has a thickness of 0.1mm to 0.3mm after drying, and the preferred coating layer thickness is 0.2mm.

[0021] The radiation surface of the heating body 5 can be made into a square, rectangular, circular, etc., with a thickness greater than or equal to 3 times the diameter of the heating rod 6. The radiation surface of the heating body in this embodiment is preferably a 40mm×40mm square, with a thickness of 3 times the diameter of the heating rod 6, and an actual effective radiation area of ​​30mm×30mm.

[0022] The radiation outlet 3 of the small surface blackbody radiation source with a wide temperature range is fixed to the metal frame of the inner shell 2 by screws. After fixing, the inner opening is close to the heating body 5 but not in contact with it, and a spacing of at least 1 mm is maintained. In this embodiment, the preferred spacing is 1.5 mm; the outer side of the radiation outlet 3 is close to the outer shell 1 but not in contact with it, and the four sides of the outlet are kept at least 1 mm apart from the four sides of the opening of the outer shell 1. In this embodiment, the preferred spacing is 1 mm. The inner surface of the radiation outlet 3 adopts a sandblasting process, with a sandblasting particle size of 40 to 80 meshes, and a preferred sandblasting particle size of 60 meshes, and is black anodized. There is also a rear cover plate fixed to the metal frame of the inner shell 2 at the rear of the inner shell, and the insulation layer in the inner shell 2 wraps the heating body through the radiation outlet 3, the rear cover plate and the metal frame.

[0023] Reference Figure 2 , 4n threaded holes are made on the four edges of the inner shell 2 rectangular parallelepiped of the small surface source blackbody radiation source with a wide temperature range, that is, n threaded holes are made on each edge, n=1, 2, 3..., which are used to fix the connecting screws 10 between the inner shell rectangular parallelepiped and the outer shell. In this embodiment, the preferred number of threaded holes on the inner shell is 4. When the volume of the inner shell increases, a group of connecting screws 10 and screw holes should be added according to the situation for connection reinforcement. The connecting screws 10 are covered with high-temperature resistant insulating sleeves and high-temperature resistant insulating gaskets on the outside to isolate the temperature conduction between the inner and outer shells. In this way, the outer shell and the inner shell are suspended in the air, and the relatively stagnant air layer in the middle serves as a heat-insulating medium. It is not only simpler and more convenient to install, and saves costs, but also has better heat preservation, which is conducive to the small surface source blackbody radiation source to quickly reach the set temperature in the high temperature section.

[0024] In order to enhance the safety of the small surface blackbody radiation source and ensure its miniaturization, the spacing between the outer surface of the inner shell 2 and the outer shell 1 is greater than or equal to 10 mm. The preferred value of this embodiment is 15 mm, so that there is enough space for heat insulation and at the same time ensures that the lead connector 11 of the heating rod 6 and the temperature detector 7 is easy to install.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A small surface blackbody radiation source with a wide temperature range, characterized in that: The invention comprises an outer shell (1), an inner shell (2), a radiation outlet (3), a heat-insulating layer (4), a heating body (5), a heating rod (6), a temperature detector (7), a heat dissipation device (8), and connecting screws (10); the heating rod (6) and the temperature detector (7) are embedded in the heating body (5), and the heating body (5) is made of a high-temperature resistant material; the heat-insulating layer (4) is installed between the heating body (5) and the inner shell (2); the radiation outlet (3) is fixed on the inner shell (2) and does not directly contact the radiation surface of the heating body (5); the outer shell (1) and the inner shell (2) are suspended in the air, and the four edges of the inner shell (2) are connected and fixed to the outer shell (1) by insulating high-temperature resistant connecting screws (10); the heat dissipation device (8) is installed at a position of the outer shell (1) opposite to the radiation surface; The heating body (5) is made of high temperature resistant material 310s stainless steel or titanium alloy TC19; The heating rods (6) are evenly distributed and buried inside the heating body (5); the heating rods (6) are single-head electric heating tubes with nickel-chromium heating wires and 316 stainless steel shells; the heating rods (6) are radially parallel to the radiation surface of the heating body (5); and the gap between the heating rods (6) and the heating body (5) is filled with a thin layer of magnesium oxide; The heating body (5) has threaded holes on both sides, and the heating rod (6) installed inside is fastened to the inner hole of the heating body (5) by means of set screws (9); The heating body (5) is perforated with holes, and one or more temperature detectors (7) are embedded therein, located between two heating rods (6) in a group, and the gaps between the holes are filled with a thin layer of magnesium oxide; The radiation surface of the heating body (5) is sandblasted with a particle size of 40 to 80 meshes; The radiation surface of the heating body (5) is sandblasted and coated with a layer of high temperature resistant infrared radiation coating, the coating layer having a thickness of 0.1 mm to 0.3 mm after drying; the radiation surface of the heating body (5) is made into a square, rectangular, circular, etc., and the thickness is greater than or equal to 3 times the diameter of the heating rod (6); The radiation outlet (3) is fixed to the inner shell (2). After the radiation outlet (3) is fixed, the inner opening is ensured to be close to the heating body (5) but not in contact with it, and a distance of at least 1 mm is maintained; the outer side of the radiation outlet (3) is close to the outer shell (1) but not in contact with it, and the periphery of the outlet is kept at least 1 mm away from the opening of the outer shell (1); the inner surface of the radiation outlet (3) is sandblasted with a sandblasting particle size of 40 to 80 meshes, and is subjected to black anodizing treatment; 4n threaded holes are formed on the four edges of the inner shell (2), that is, n threaded holes are formed on each edge, n=1, 2, 3..., for fixing the connecting screws (10); the connecting screws (10) between the inner shell (2) and the outer shell (1) are covered with high-temperature resistant insulating sleeves and high-temperature resistant insulating gaskets; The distance between the outer surface of the inner shell (2) and the outer shell (1) is greater than or equal to 10 mm.

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