Design and modal analysis of optical and mechanical structures of a space infrared camera

Details Design and modal analysis of optical and mechanical structures of a space infrared camera Design and modal analysis of optical and mechanical structures of a space infrared camera

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7133e.143z&link_type=abstract

Fifth International Symposium on Instrumentation Science and Technology. Edited by Zhang, Guangyu; Sun, Dewei; Long, Funian. P

Astronomy and Astrophysics

Astronomy

Scientific paper

Space infrared cameras have been widely used for weather prediction, earth resource detection, military reconnaissance and astronomy observation. In order to design and produce an excellent space camera, the optical and mechanical structures of the camera are deeply investigated. Firstly, according to the technical targets and interface requirements for infrared sensor, optical modulation transfer function (MTF) must be up to 0.65 in the central field and more than 0.55 in the marginal field at the cut-off frequency of the optical system. Secondly, in accordance with the requirement of optical system, the structure of body tube is designed and a new type of material- graphite fiber reinforced aluminium matrix composite (Gr/Al composite) is used for the first time. The weight of Gr/Al composite body tube is 31.8% lighter than that of Titanium alloy. Thirdly, in terms of the theory of modal analysis, the resonance frequencies and modal sharps of body tube are acquired. The first order resonance frequency is 292Hz. Finally, the test of random vibration is conducted. Experimental results indicate that optical and mechanical systems do not change after vibration test. Namely, the research above suggests that space infrared camera has an important utility value in the space remote sensing field.

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