A space camera focal plane frame

Abstract

A focal plane frame of a space camera, which is a rectangular box structure, including a light entrance surface, etc.; the light entrance surface is the opening surface of the rectangular box body; There are several light openings for detector light; the reflection area surface is a vertical surface adjacent to the direct exposure area on the rectangular box body, and there are several light openings for detector light transmission on the reflection area surface; The mirror connection surface is located in the box body and is parallel to the reflection area surface; the focal plane frame connection surface is the parallel surface at both ends of the box body, and is perpendicular to the light entrance surface, the direct irradiation area surface, the reflection area surface, and the reflection mirror connection surface. The invention solves the contradiction between the weight of the focal plane support structure and high stability of the space optical remote sensor, and develops the advantages of C / SiC ceramic matrix composite materials in the high-power internal heat source, high-precision and high-stability structure size of the aerospace remote sensor The application has changed the traditional titanium alloy and Invar structural forms of the remote sensor support structure.

Description

Technical field [0001] The invention relates to a focal plane frame of a space camera, in particular to a focal plane frame support structure of a high-resolution camera that can be used for spatial surveying and mapping. Background technique [0002] Aerospace cameras mostly use the focal plane frame as the support structure of the focal plane. The temperature-induced space change between the focal plane detector and optical parts will be determined by the linear expansion coefficient of the focal plane frame, and the relative change between the detector and optical parts It will cause a change in the geometric accuracy of the camera, so the thermal stability of the focal plane must be strictly controlled. Therefore, the material of the focal plane frame needs to have the requirements of low density, high rigidity, high thermal conductivity and large specific heat capacity at the same time. At the same time, the focal plane frame needs to carry the detector, the mirror and the ...

AI Technical Summary

Problems solved by technology

Although carbon fiber reinforced resin matrix composites have low density and high specific stiffness, the long-term use of space is a major challenge to the stability of the resin matrix. At the same time, it is sensitive to water vapor and caused by moisture absorption. The volume expansion of the space optical system will cause a large change in the size of the space optical system when it is assembled on the ground and when the space is in orbit.

[0004] The configuration and materials of the traditional focal plane frame cannot meet the requirements of structural stability, thermal stability and weight.

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