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《Acta Optica Sinica》 2010-10
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Optical System Design of Space Sensor with Two Long Focal Length Lens

He Yinghong Ma Zhen Zhao Baochang Chang Lingying Chen Liwu Ma Xiaolong Yi Hongwei(Xi′an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi′an,Shaanxi 710119,China)  
A compact space optical system without moving parts which can get two focal lengths is designed.Ritchey-Chrétien(R-C) mirror is common for long-focus system and short-focus system.A splitter prism is used for splitting the light into two beams relayed by transmitting optical system.The focal length is 4700 mm and F number is 13.4 for the long-focus system,and the focal length is 2350 mm and F number is 6.7 for the short-focus system.Some measure is taken to make sure the less degradation of MTF for thermal distortion,such as a kind of material with small thermal expansion using comrection between the primer mirror and the second mirror and material with good thermal property as mirror substrate for reduce surface distortion.The modulation transfer function(MTF) of optical system in condition of(19±3) ℃ is analyzed,which shows a good result for user′s requirement.
【Fund】: 国家973计划(2009CB724006)资助课题
【CateGory Index】: TH74
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