KEYWORDS: Thermal stability, Cameras, Mirrors, Temperature control, Space mirrors, Heat flux, Temperature metrology, Objectives, Control systems, Shadows
High temperature stability is an important parameter in thermal design of space cameras, because high resolution space cameras need highly stable thermal system. However, severe orbital thermal environment and complex satellite attitudes bring big challenges for thermal control of space camera. Traditional thermal control method can not meet high stability. Therefore, a novel thermal control method of high temperature stability is proposed to deal with the problem. Indirect radiation thermal control and differential temperature control method is applied for the structure of the camera, which significantly decreases temperature fluctuation and disturbance of external thermal environment. The in-orbit temperature data indicate that the temperature fluctuation of structures of the camera is better than ±0.2 °C and the mirrors are better than ±0.1 °C. The orbital temperature performance demonstrates that the thermal control method of high temperature stability for the high resolution space camera is reasonable and feasible and the thermal system satisfies the high stability demand. The novel method solves the demand of high thermal stability under harsh environment, and plays an important role in enhancing space camera resolution.
In response to the heat dissipation requirements of space optical remote sensor electronics and other heat sources, the characteristics of the orbital heat flux of the high inclination orbit where the remote sensor is located are analyzed. Combined with the position characteristics of the remote sensor platform and the two-dimensional manoeuvring characteristics, the spatial layout position and required area of the heat dissipation radiator are determined. Utilizing heat pipe network to achieve the realization of the heat dissipation radiator groups, achieving effective heat dissipation of the heat source while the high orbital heat flux on the single position of the radiator. Adopting a non-metallic and graphite film composite heat dissipation radiator form, further improving the temperature uniformity of the heat dissipation radiator and effectively enhancing the heat dissipation of the remote sensor. Through this technology, the heat dissipation problem of complex orbit heat flux remote sensors can be solved.
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