A small surface high temperature blackbody source suitable for low cold vacuum environment

Abstract

In order to solve the defect of the prior art that high-temperature blackbody sources under the environmental parameters of typical space ring mold equipment lack a universal solution, the present invention proposes a small-surface high-temperature blackbody source adapted to a low-cold vacuum environment, comprising: a pyrolytic graphite heating core element, a power supply circuit, and a multi-layer radiation screen insulation system; wherein the pyrolytic graphite heating core element and the power supply circuit are arranged inside the multi-layer radiation screen insulation system; the power supply circuit is used to energize the pyrolytic graphite heating core element so that the pyrolytic graphite heating core element generates thermal radiation; the multi-layer radiation screen insulation system is used to form a closed thermal environment inside the blackbody radiation source. The present invention is suitable for target illumination of a semi-physical simulation system.

Description

Technical Field

[0001] The invention relates to the field of space infrared light environment simulation, and in particular to a small surface source high temperature black body source adaptable to a low cold vacuum environment. Background Art

[0002] With the development of infrared technology, infrared homing guidance technology has become one of the core technologies in the contemporary national defense and military field. With the demand for semi-physical simulation systems in the development of missile weapons, infrared target and environment simulation technology has emerged. In recent years, many weapon systems need to work in a low-temperature vacuum space environment. In order to make the simulation as close to the real environment as possible, the semi-physical simulation system that simulates the target also needs to work in a low-temperature vacuum environment.

[0003] The environmental parameters provided by the typical space ring model equipment are: the background absolute temperature is not greater than 100K; the ambient pressure is not higher than 1.3×10 -3 Pa. The requirements for the high-temperature blackbody source used in the infrared point source semi-physical simulation system in this environment are as follows: 1) The heating surface temperature must reach above 2400K; 2) Good temperature stability (less than 5% / 30min); 3) Low power consumption; 4) No pollution; 5) Low voltage operation; 6) Short thermal equilibrium time; 7) Less heat leakage; 8) Small size; 9) Good reliability.

[0004] At present, the optomechanical structure technology in this environment is relatively mature, and the motion mechanism involved in target movement has also formed an industry. However, there is no universal solution for the high-temperature blackbody source used in this environment.

[0005] Therefore, a new high-temperature blackbody source solution is needed to solve the problems of the existing technology. Summary of the invention

[0006] One purpose of the present invention is to solve the defect of the prior art that there is a lack of a universal solution for high-temperature blackbody sources under the environmental parameters of typical space ring mold equipment, and to propose a small-surface high-temperature blackbody source that is adaptable to a low-cold vacuum environment, comprising: a pyrolytic graphite heating core element, a power supply circuit, and a multi-layer radiation screen insulation system; wherein the pyrolytic graphite heating core element and the power supply circuit are arranged inside the multi-layer radiation screen insulation system; the power supply circuit is used to energize the pyrolytic graphite heating core element so that the pyrolytic graphite heating core element generates thermal radiation; the multi-layer radiation screen insulation system is used to form a closed thermal environment inside the blackbody radiation source.

[0007] Preferably, the pyrolytic graphite heating core element has a main heating area and an element fixing area, and the thickness of the main heating area is lower than that of the element fixing area.

[0008] Preferably, the element fixing area is distributed at both ends of the pyrolytic graphite heating core element, and the main heating area is distributed in the center of the pyrolytic graphite heating core element.

[0009] Preferably, the power supply circuit comprises a main electrode, a cabin-penetrating electrode and a DC power supply; the main electrode is connected to the DC power supply via the cabin-penetrating electrode.

[0010] Preferably, the small surface high temperature blackbody source adapted to the low cold vacuum environment further comprises a pressing block and a heat resistant insulating seat, the main electrode is mounted on the heat resistant insulating seat; the pyrolytic graphite emission core element is pressed onto the main electrode through the pressing block.

[0011] Preferably, the multi-layer radiation screen heat insulation system comprises an inner radiation screen, a middle radiation screen, an outer shell, and a wide-band infrared window.

[0012] Preferably, the small surface source high temperature black body source adapted to the low cold vacuum environment further comprises a window press-fit flange, and the window press-fit flange seals and mounts the wide band infrared window on the housing via an O-ring for sealing.

[0013] Preferably, the inner radiation screen, the middle radiation screen and the outer shell are provided with apertures on the infrared radiation path, which can constrain the black body radiation emission energy angle.

[0014] Preferably, the inner radiation screen, the middle radiation screen and the outer shell are all made of 06Cr19Ni10 stainless steel material.

[0015] Preferably, the heat-resistant insulating seat is made of zirconia ceramic.

[0016] The present invention uses pyrolytic graphite material to make the heating core, and uses the method of directly supplying power to the pyrolytic graphite element to make it heat. Since the resistivity of pyrolytic graphite is relatively low, it can work in a low-voltage and high-current mode. Since the graphite material has low thermal melting point, low density and small element volume, it can achieve thermal equilibrium in a short time, and provide efficient, fast and stable infrared radiation for the system as a black body radiation source.

[0017] The beneficial effects of the present invention are:

[0018] 1. A small surface blackbody radiation source that can work in a low-cold vacuum environment and has a temperature of up to 2400K has been realized, and the temperature stability is better than 3% / 30min;

[0019] 2. The blackbody radiation source has been miniaturized, and when used in a point source target semi-physical simulation system, sufficient space is reserved for the optical system design;

[0020] 3. The heating core material pyrolytic graphite used in the blackbody radiation source is a high-purity material that is resistant to high temperatures. There is no pollution problem to the space ring mold equipment. The radiation source shell is a self-enclosed structure that is compatible with vacuum and normal pressure working environments.

[0021] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0023] FIG1 is a schematic diagram of the structure of a pyrolytic graphite heating core element according to an embodiment of the present invention; FIG1(a) is a front view of the embodiment, and FIG1(b) is a side view of the embodiment;

[0024] Figure 2 This is a diagram showing the internal structure of a blackbody radiation source according to an embodiment of the present invention;

[0025] Figure 3 The figure is a cross section of the overall structure of a blackbody radiation source system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0027] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0028] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0029] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0030] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0031] The present invention provides a small surface source high temperature black body source adaptable to low cold vacuum environment, comprising a pyrolytic graphite heating core element, a power supply circuit, and a multi-layer radiation screen insulation system; wherein the pyrolytic graphite heating core element and the power supply circuit are arranged inside the multi-layer radiation screen insulation system; the power supply circuit is used to energize the pyrolytic graphite heating core element so that the pyrolytic graphite heating core element generates thermal radiation; the multi-layer radiation screen insulation system is used to form a closed thermal environment inside the black body radiation source.

[0032] The “low-cold vacuum environment” mentioned in the present invention refers to a vacuum environment with an absolute temperature not greater than 100K.

[0033] FIG. 1 is a structural diagram of a pyrolytic graphite heating core element 2 in one embodiment observed from different directions. Figure 2 and Figure 3 One embodiment of a high temperature blackbody source is shown.

[0034] In the embodiment shown in FIG1 , the pyrolytic graphite heating core element has a main heating area 2-2 and an element fixing area 2-1, and the thickness of the main heating area 2-2 is lower than that of the element fixing area 2-1. The element fixing area 2-1 is distributed at both ends of the pyrolytic graphite heating core element 2, and the main heating area 2-2 is distributed in the center of the pyrolytic graphite heating core element 2.

[0035] Specifically, the heating core element in the embodiment shown in FIG1 is made of pyrolytic graphite material throughout, the thinner middle part is the main heating area 2-2 when the element is working, and is also the radiation area that ultimately serves as a black body radiation source, and the thicker parts at both ends are the element fixing area 2-1, which also serves as the electrode tip. After the element is powered on, most of the heat will be generated by the middle part due to the difference in structural cross-sectional area, and because the thermal resistance of the graphite material will increase sharply with the increase in temperature, the heating area will automatically form a relatively closed thermal environment, and then quickly reach a high temperature state with good uniformity.

[0036] Figure 2 The internal structure of a black body radiation source is shown in FIG. Figure 2 In the illustrated embodiment, it can be seen that the connection relationship between the pyrolytic graphite heating core element 2 and the power supply circuit. The thermal radiation generation system consists of a pressing block 1, a pyrolytic graphite heating core 2, a main electrode 3, a heat-resistant insulating seat 4, a through-cabin electrode 5 and a main flange plate 6. A pair of main electrodes 3 are installed on a heat-resistant insulating seat 4 made of zirconia ceramic material, and then the upper surfaces of a pair of main electrodes 3 are uniformly ground and flattened to avoid installation stress on the pyrolytic graphite heating core 2. The main electrode 3 is connected to a programmable DC power supply (not shown in the figure) outside the blackbody vacuum cabin through the through-cabin electrode 5 to realize the construction of the power supply path, while ensuring that the local vacuum protection environment required for the blackbody operation is not destroyed. The pyrolytic graphite heating core 2 is pressed onto the main electrode 3 through the pressing block 1 to realize the closure of the system power supply working circuit.

[0037] Figure 3 This is the overall structural section of the blackbody radiation source system. Figure 3In the illustrated embodiment, it can be seen that the structural relationship between the multi-layer radiation screen insulation system and the power supply circuit and the pyrolytic graphite heating core element. In addition to the thermal radiation generation system structure, the blackbody radiation source structure also includes an inner radiation screen 7, a middle radiation screen 8, an outer shell 9, a wide-band infrared window 10 and a window press-fit flange 11. The inner radiation screen 7, the middle radiation screen 8 and the outer shell 9 can be made of 06Cr19Ni10 stainless steel material after fine processing, and then after electrolytic polishing treatment, a lower surface roughness can be obtained. They together constitute the multi-layer radiation screen insulation system of the blackbody radiation source, realizing a closed thermal environment inside the blackbody radiation source. The inner radiation screen 7, the middle radiation screen 8 and the outer shell 9 are processed with a light bar of corresponding caliber on the infrared radiation path, which can realize the constraint of the blackbody radiation emission energy angle. The window press-fit flange 11 seals the wide-band infrared window 10 on the outer shell 9 through a sealing O-ring, which serves as the optical interface of the blackbody vacuum cavity.

[0038] <Example>

[0039] The structural diagram of this embodiment is shown in Figures 1 to Figure 3 shown.

[0040] This embodiment applies pyrolytic graphite material to the heating and radiation elements of the blackbody radiation source, uses direct power supply to make the pyrolytic graphite heating core generate heat, uses electrode structure and material configuration to constrain the heat conduction path, and cooperates with stainless steel multi-layer radiation screen to ensure that the thermal equilibrium time of the heating surface is short and the temperature is uniform, providing a high-temperature and stable radiation source for the infrared point source target semi-physical system working in a low-cold vacuum environment. The infrared point source target semi-physical simulation system in a low-cold vacuum environment requires a light source illumination area of ​​Φ2mm and a temperature of 2400K.

[0041] The pyrolytic graphite heating core 2 is directly pressed onto the main electrode 3. After a pair of main electrodes 3 are fixed on the heat-resistant insulating seat 4, the upper surface is uniformly ground to ensure that no additional stress is generated when pressing the graphite heating core 2. The heating area of ​​the pyrolytic graphite heating core is 4mm×4mm, and the central uniform temperature area after balancing is Φ3mm.

[0042] The penetration electrode 5 is a vacuum sintered high current sealed electrode, which can adapt to 1×10 -8 The sealing requirements of Pa are met; the wide-band infrared window 10 uses a 1-inch multi-spectral ZnS material window, which can adapt to the working requirements of the medium and long-wave infrared bands; all connecting sealing links are sealed with fluororubber sealing rings to ensure the vacuum environment inside the blackbody radiation source shell to maintain the long-term working ability of the pyrolytic graphite heating core 2.

[0043] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A small surface source high temperature black body source adapted to low cold vacuum environment, characterized in that: It includes a pyrolytic graphite heating core component, a power supply circuit, and a multi-layer radiation screen insulation system; wherein the pyrolytic graphite heating core component and the power supply circuit are arranged inside the multi-layer radiation screen insulation system; the power supply circuit is used to energize the pyrolytic graphite heating core component so that the pyrolytic graphite heating core component generates thermal radiation; The multi-layer radiation screen insulation system is used to form a closed thermal environment inside the black body radiation source; The pyrolytic graphite heating core element (2) comprises a main heating area (2-2) and an element fixing area (2-1), wherein the thickness of the main heating area (2-2) is lower than that of the element fixing area (2-1); The element fixing area (2-1) is distributed at both ends of the pyrolytic graphite heating core element (2), and the main heating area (2-2) is distributed in the center of the pyrolytic graphite heating core element (2).

2. The small surface source high temperature black body source adapted to low cold vacuum environment according to claim 1, characterized in that: The power supply circuit comprises a main electrode (3), a cabin-penetrating electrode (5) and a direct current power supply; the main electrode is connected to the direct current power supply via the cabin-penetrating electrode (5).

3. The small surface source high temperature black body source adapted to low cold vacuum environment according to claim 2, characterized in that: It also comprises a pressing block (1) and a heat-resistant insulating seat (4), wherein the main electrode (3) is mounted on the heat-resistant insulating seat (4); and the pyrolytic graphite emission core element (2) is pressed onto the main electrode (3) through the pressing block (1).

4. The small surface source high temperature black body source adapted to low cold vacuum environment according to claim 1, characterized in that: The multi-layer radiation screen heat insulation system comprises an inner radiation screen (7), a middle radiation screen (8), an outer shell (9), and a wide-band infrared window (10).

5. The small surface source high temperature black body source adapted to low cold vacuum environment according to claim 4, characterized in that: It also comprises a window press-fit flange (11), wherein the window press-fit flange (11) seals and mounts the wide-band infrared window (10) on the housing (9) via an O-ring for sealing.

6. The small surface source high temperature black body source adapted to low cold vacuum environment according to claim 4, characterized in that: The inner radiation screen (7), the middle radiation screen (8) and the outer shell (9) are provided with apertures on the infrared radiation path, which can restrict the black body radiation emission energy angle.

7. The small surface source high temperature black body source adapted to low cold vacuum environment according to claim 4, characterized in that: The inner radiation screen (7), the middle radiation screen (8) and the outer shell (9) are all made of 06Cr19Ni10 stainless steel material.

8. The small surface source high temperature black body source adapted to low cold vacuum environment according to claim 3, characterized in that: The heat-resistant insulating seat (4) is made of zirconium oxide ceramic material.

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