A novel design of membrane mirror with small deformation and imaging performance analysis in infrared system |
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| Institution: | 1. State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, PR China;2. College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, PR China;1. Mechanical Department, Nanling Campus, Jilin University, Changchun 130025, PR China;2. China FAW Group Corporation R&D Center, Changchun 130011, PR China;1. School of Automation, Huazhong University of Science and Technology, Wuhan, PR China;2. National Key Laboratory of Science and Technology on Multi-Spectral Information Processing, Wuhan, PR China |
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| Abstract: | A method of diminishing the shape error of membrane mirror is proposed in this paper. The inner inflating pressure is considerably decreased by adopting the pre-shaped membrane. Small deformation of the membrane mirror with greatly reduced shape error is sequentially achieved. Primarily a finite element model of the above pre-shaped membrane is built on the basis of its mechanical properties. Then accurate shape data under different pressures can be acquired by iteratively calculating the node displacements of the model. Shape data are applicable to build up deformed reflecting surfaces for the simulative analysis in ZEMAX. Finally, ground-based imaging experiments of 4-bar targets and nature scene are conducted. Experiment results indicate that the MTF of the infrared system can reach to 0.3 at a high spatial resolution of 10l p/mm, and texture details of the nature scene are well-presented. The method can provide theoretical basis and technical support for the applications in lightweight optical components with ultra-large apertures. |
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| Keywords: | Inflated reflector Pre-shaped membrane surface Small shape deformation Nonlinear finite element method Medium wave infrared system |
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