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Proceedings Paper

Optomechanical stability design of space optical mapping camera
Author(s): Fuqiang Li; Weijun Cai; Fengqin Zhang; Na Li; Junjie Fan
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Paper Abstract

According to the interior orientation elements and imaging quality requirements of mapping application to mapping camera and combined with off-axis three-mirror anastigmat(TMA) system, high optomechanical stability design of a space optical mapping camera is introduced in this paper. The configuration is a coaxial TMA system used in off-axis situation. Firstly, the overall optical arrangement is described., and an overview of the optomechanical packaging is provided. Zerodurglass, carbon fiber composite and carbon-fiber reinforced silicon carbon (C/SiC) are widely used in the optomechanical structure, because their low coefficient of thermal expansion (CTE) can reduce the thermal sensitivity of the mirrors and focal plane. Flexible and unloading support are used in reflector and camera supporting structure. Epoxy structural adhesives is used for bonding optics to metal structure is also introduced in this paper. The primary mirror is mounted by means of three-point ball joint flexures system, which is attach to the back of the mirror. Then, In order to predict flexural displacements due to gravity, static finite element analysis (FEA) is performed on the primary mirror. The optical performance peak-to-valley (PV) and root-mean-square (RMS) wavefront errors are detected before and after assemble. Also, the dynamic finite element analysis(FEA) of the whole optical arrangement is carried out as to investigate the performance of optomechanical. Finally, in order to evaluate the stability of the design, the thermal vacuum test and vibration test are carried out and the Modulation Transfer Function (MTF) and elements of interior orientation are presented as the evaluation index. Before and after the thermal vacuum test and vibration test, the MTF, focal distance and position of the principal point of optical system are measured and the result is as expected.

Paper Details

Date Published: 10 January 2018
PDF: 10 pages
Proc. SPIE 10616, 2017 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 106160C (10 January 2018); doi: 10.1117/12.2295353
Show Author Affiliations
Fuqiang Li, Beijing Institute of Space Mechanics and Electricity (China)
Weijun Cai, Beijing Institute of Space Mechanics and Electricity (China)
Fengqin Zhang, Beijing Institute of Space Mechanics and Electricity (China)
Na Li, Beijing Institute of Space Mechanics and Electricity (China)
Junjie Fan, Beijing Institute of Space Mechanics and Electricity (China)


Published in SPIE Proceedings Vol. 10616:
2017 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Yongtian Wang; Baohua Jia; Kimio Tatsuno; Liquan Dong, Editor(s)

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