Design and Analysis of Integration Structure of Space-Borne Fourier Transform Spectrometer

Abstract

As main supporting structure of conventional space-borne remote sensor, single layer panel design causes that the space of payload is occupied by large numbers of erose optical-mechanical assemblies and electrical instruments, and the size of payload is increased. The satellite space is seized, the number of satellite payload is decreased, and the function of satellite is limited. Combining current development situation of space optical remote sensor, and basing on the requirements of small size and decreased weight of payload, a kind of double layer integration structure is introduced into space-borne Fourier transform spectrometer, which takes full advantage of remainder space of height direction. The layout of payload is optimized, and the size is diminished and meets the requirement by using of this supporting structure. Firstly, the design method and advantage of this structural format are elaborated. As the most critical assembly of spectrometer, the carbon fiber aluminum honeycomb composite panel bears the weight of topper and lower assemblies, which takes great effect to the mechanical stability of spectrometer. The detailed design of carbon fiber aluminum honeycomb composite panel is illustrated in this paper, which includes structural format, the choice of reinforced fiber and resin matrix, and design of the reinforced frame. Secondly, the finite element model of carbon fiber aluminum honeycomb composite panel and whole spectrometer are built, mechanical analysis are conducted, including the displacement of optical assemblies under the action of gravity and 20 ± 3 °C temperature range, and the model analysis of spectrometer. The displacement of carbon fiber aluminum honeycomb composite panel meets the design requirements by the analysis, which has proved that the carbon fiber aluminum honeycomb composite panel could bear the weight of topper and lower assemblies and guarantee the mechanical stability of spectrometer. The reliability of double-layer integration supporting structure of space-borne Fourier transform spectrometer has been validated.