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11 October 2012 Thermal optical path difference analysis of off-axis lens ray trace foot-print at Cassegrain telescope correct lens assembly
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Abstract
The Cassegrain telescope system in this study, is discussion correct lens thermal OPD (Optical Path Difference) effect optical performance. The correct lens assembly are includes several components such as correct lens, lens mount, spacer, mount barrel and retainer. The heat transfer from surrounding to the correct lens barrel will causes optical system aberration. Meanwhile, the off-axis rays path of the OPD must consider lens incidence point and emergence point. The correct lens temperature distribution is calculate the lens barrel heat transfer analysis, the thermal distortion and stress are solve by FEM (Finite Element Method) software. The temperature calculation results can be weighting to each incidence ray path and calculate thermal OPD. The thermal OPD on Z-direction can be fitted by rigid body motion and Zernike polynomial. The fitting results can be used to evaluate the thermal effect on correct lens assembly in telescope system.
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Ming-Ying Hsu, Yu-Chuan Lin, Chia-Yen Chan, Wei-Cheng Lin, Shenq-Tsong Chan, and Ting-Ming Huang "Thermal optical path difference analysis of off-axis lens ray trace foot-print at Cassegrain telescope correct lens assembly", Proc. SPIE 8486, Current Developments in Lens Design and Optical Engineering XIII, 848604 (11 October 2012); https://doi.org/10.1117/12.928833
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