Thermal switch for heat control system of camera

Abstract

The invention relates to a switch of a thermal control system for a temperature sensing device, in particular to a thermal switch of a thermal control system for a spatial camera. The thermal switch comprises a left heat conducting block, a right heat conducting block, a movable heat conducting block which can transversally move between the left heat conducting block and the right heat conducting block, a telescopic rod made of materials with the thermal expansion coefficient larger than that of the left heat conducting block, the right heat conducting block and the movable heat conducting block, and a spring. Both the left heat conducting block and the right heat conducting block are provided with blind holes with openings towards the movable heat conducting block; the telescopic rod and the left heat conducting block are arranged in the blind hole of the left heat conducting block in a sliding fit manner; and the spring is arranged in the blind hole of the right heat conducting block. The movable heat conducting block is achieved to be respectively in crossed contact with the left heat conducting block and the right heat conducting block to change a thermal conducting channel through the thermal expansion and the cold shrinkage of the telescopic rod. The thermal switch has the advantages of simple structure, high reliability and long service life, and can achieve the automatic temperature control function of the temperature sensing device.

Description

technical field [0001] The invention relates to a thermal control system switch applied to temperature sensitive devices, in particular to a thermal control component that can be used as a variable heat dissipation channel for space optical remote sensor CCD focal plane components and the like. Background technique [0002] At present, most space cameras use CCD as the detection device. However, it is sensitive to temperature. Excessively high temperature levels and excessive temperature fluctuations will increase the dark current and thermal noise of the CCD device, resulting in a decrease in signal-to-noise ratio and affecting image quality. Therefore, it is the goal of CFPA thermal design to ensure that the CCD focal plane assembly (CFPA) is at a lower temperature level and within a smaller temperature fluctuation range. [0003] Due to the space environment where the camera is located, as well as the requirements of optical and mechanical structures, CFPA is installed i...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a thermal switch for the space camera thermal control system, to overcome the disadvantage that the temperature of the detection device CCD focal plane assembly (CFPA) in the current space camera is difficult to control, and effectively ensure the stability of the space camera work

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