The correct lens mount lightweighting design and thermal stress OPD analysis in Cassegrain telescope

Ming-Ying Hsu; Chia-Yen Chan; Wei-Cheng Lin; Shenq-Tsong Chang; Ting-Ming Huang

doi:10.1117/12.2022712

18 September 2013 The correct lens mount lightweighting design and thermal stress OPD analysis in Cassegrain telescope

Ming-Ying Hsu, Chia-Yen Chan, Wei-Cheng Lin, Shenq-Tsong Chang, Ting-Ming Huang

Proceedings Volume 8836, Optomechanical Engineering 2013; 883602 (2013) https://doi.org/10.1117/12.2022712
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

This study is trying to evaluate different lens barrel material, caused lens stress OPD (Optical Path Different) in different temperature condition. The Cassegrain telescope's correct lens assembly are including as correct lens, lens mount, spacer, mount barrel and retainer. The lens barrel initial design is made by invar, but system mass limit is need to lightweighting to meet requirement. Therefore, the lens barrel material is tried to replace to lower density material, such as aluminum and titanium alloy. Meanwhile, the aluminum or titanium alloy material properties CTE (Coefficient of Thermal Expansion) are larger then invar. Thus, the high CTE material will introduce larger thermal stress into the optical system in different temperature condition. This article is analysis the correct lens assembly thermal stress and optical performance in different lens mount material. From above conditions, using FEM (Finite Element Method) and optical software, simulation and optimization the lens mount to achieve system mass requirement.

Citation Download Citation

Ming-Ying Hsu, Chia-Yen Chan, Wei-Cheng Lin, Shenq-Tsong Chang, and Ting-Ming Huang "The correct lens mount lightweighting design and thermal stress OPD analysis in Cassegrain telescope", Proc. SPIE 8836, Optomechanical Engineering 2013, 883602 (18 September 2013); https://doi.org/10.1117/12.2022712

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