7 March 2003 Adjustable truss for support, optical alignment, and athermalization of a Schmidt camera
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Abstract
The MODS optical spectrograph uses a de-centered Maksutov-Schmidt camera with a clear aperture of ~300mm. This large camera has two widely spaced elements, the corrector and the camera mirror, and a field flattener near the focal plane. This paper describes the truss system that supports the optical elements very rigidly, uses adjustable length links to provide a deterministic method for alignment of the optical elements, and uses material combinations which result in a camera with nearly zero focus shift due to changes in temperature. A novel joint design for terminating the truss links is described that has excellent stiffness and enhances ease of assembly and alignment.
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Bruce Atwood, Thomas P. O'Brien, "Adjustable truss for support, optical alignment, and athermalization of a Schmidt camera", Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, (7 March 2003); doi: 10.1117/12.459965; https://doi.org/10.1117/12.459965
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