LRIS-2 preliminary design: opto-mechanical design and analysis for the camera lens mount

Rishi Pahuja; Reston Nash; Jason Fucik; Steven Gibson; Bradford Holden; Charles Steidel

doi:10.1117/12.3020881

19 July 2024 LRIS-2 preliminary design: opto-mechanical design and analysis for the camera lens mount

Rishi Pahuja, Reston Nash, Jason Fucik, Steven Gibson, Bradford Holden, Charles Steidel

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130966P (2024) https://doi.org/10.1117/12.3020881
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

LRIS-2 (Low Resolution Imaging Spectrometer) is a planned Cassegrain mounted spectrometer at WM Keck Observatory with on-axis field of view of 5’x10’ in two simultaneous wavelength channels covering 310-1000nm at R~1500 in a single exposure. This instrument will replace its precursor whose optomechanical design and aging mechanisms preclude further improvements in its stability and reliability. The instrument has two science cameras for Red (~550-1000nm) and blue (~310-550nm) channels, each comprising of six lens elements. This poster details the design scheme and thermo-structural analysis for the lens mounting strategy. The design features 6 passive radial thermal compensators, addressing differential thermal expansion between Aluminum cell and the lens. A comparative assessment among three material candidates for the compensators resulted in an optimized geometry and hertzian contact stress using finite element analysis (FEA). A prototype was developed to validate the design accuracy and repeatability.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Rishi Pahuja, Reston Nash, Jason Fucik, Steven Gibson, Bradford Holden, and Charles Steidel "LRIS-2 preliminary design: opto-mechanical design and analysis for the camera lens mount", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130966P (19 July 2024); https://doi.org/10.1117/12.3020881

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