Design method for thermal radiation controllable infrared optical window thin film
An infrared optical window and thin film design technology, applied in optics, optical components, instruments, etc., can solve problems such as low emissivity and reduced sensitivity of infrared detection systems
Active Publication Date: 2017-11-21
TIANJIN JINHANG INST OF TECH PHYSICS
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Problems solved by technology
Although refrigeration can be used to cool the window, the change of the window emissivity due to the anti-reflection treatment of the film still needs to be considered. The sensitivity is reduced, so how to reduce the radiation in the leeward direction of the window is one of the issues worthy of attention
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[0049] The present invention will be described in detail below in conjunction with the accompanying drawings and examples.
[0050] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0051] The invention provides a method for designing an infrared heat radiation control film of an optical window. The two surfaces of the optical window are respectively recorded as a surface and a surface B, wherein the surface A is the windward surface, which is treated with an anti-reflection protective film, and the surface B is the leeward surface. Anti-reflective film treatment is performed.
[0052] 1) The design method of the anti-reflection protective film on the windward side: select high refractive index materials: select germanium carbide film (Ge 1-x C x ) and low refractive index...
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The invention discloses a thermal radiation controllable infrared optical window thin film, and specifically relates to a thermal radiation regulation method for a long wave transparent region of an infrared optical window. The main characteristics of the method are that based on a combination of a GeC thin film and a diamond-like carbon thin film, two layers of anti-reflection protective films of a windward side are designed, and based on a combination of a zinc sulfide thin film and a yttrium fluoride thin film, an anti-reflecting thin film of a leeward side is designed. The main design idea is that residual reflectance of the leeward side is lower than residual reflectance of the windward side, finally realizing that radiance of the leeward side is lower than the radiance of a base. The method can be applied in an optical window of a long wave infrared optical imaging system which has thermal radiation control requirement.
Description
technical field [0001] The invention belongs to the technical field of optical thin films, and relates to the control technology of the optical window thin film characteristics of an infrared imaging system, in particular to a design method of an infrared optical window thin film with an integrated structure with controllable thermal radiation. Background technique [0002] With the development of infrared physics and device technology, imaging and detection technology based on passive infrared is widely used in scientific research and national defense. As an important optical component of infrared imaging and detection technology, the optical window produces the aero-optical effect under the aerodynamic heating of high-speed flight, which reduces the signal-to-noise ratio of the optical detection system to the target detection, thereby reducing the detection distance of the target. "thermal barrier" and submerged need to detect the target signal. The environment where the ...
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IPC IPC(8): G02B1/115
CPCG02B1/115
Inventor 刘华松杨霄孙鹏冷健刘丹丹季一勤
Owner TIANJIN JINHANG INST OF TECH PHYSICS