An expandable hood

Abstract

The invention discloses a deployable light shield comprising fluid loop pipelines, fins, a heat insulation assembly and a temperature control system. The deployable light shield designed by the invention has a fluid temperature control function, and solves temperature control problems of existing large aperture optical remote sensor deployable light shields. When sunshine directly shines on the fins or fluid loop pipelines inside the light shield, heat is rapidly taken away through the fluid loops, so that a rapid temperature equalizing effect is realized, and the uniformity and stability of optical lens are ensured, and the quality of imaging is raised. In addition, the fluid loops can provide an auxiliary adjusting effect for a heat control system of a whole machine of a remote sensor.

Description

Technical field [0001] The invention relates to an expandable light shield, in particular to an expandable light shield with fluid temperature control function applied to a space remote sensor, belonging to the technical field of aerospace optical remote sensing. Background technique [0002] In order to suppress the influence of stray light, the front end of the optical lens of the space optical remote sensor needs to be equipped with a hood. With the development of space remote sensing technology, the aperture of the optical system of the space optical remote sensor is increasing. In order to effectively suppress the influence of stray light, a longer hood is required. The length of the hood even exceeds the envelope range of the rocket fairing. In this case, the expandable hood technology can optimize the space interface relationship between the hood and the satellite through the design of retractable launch and pop-up in orbit, ensuring that the remote sensor meets the launch...

AI Technical Summary

Problems solved by technology

However, for the expandable sunshade, the size in the length direction is larger, and the closer to the optical lens along the length direction, the smaller the visible view factor of the cool black space. Because the absorbed external heat flow energy cannot be dissipated in time, it will cause local high temperature and even form local hot spots

For large-aperture optical systems, the temperature of the hood has a significant impact on the optical lens. In this case, the local high temperature and hot spots in some areas of the hood will inevitably have a bad impact on the temperature of the optical lens.

In addition, due to the complex wiring of the movable mechanism of the deployable structure, it is impossible to arrange an active temperature control heating circuit on its surface to suppress the temperature fluctuation between different areas on the track and at different times in the same area.

Its large temperature non-uniformity is bound to adversely affect the optical lens

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