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Proceedings Paper

Mechanical design of mounts for IGRINS focal plane arrays and field flattening lenses
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Paper Abstract

IGRINS, the Immersion GRating INfrared Spectrometer, is a near-infrared wide-band high-resolution spectrograph jointly developed by the Korea Astronomy and Space Science Institute and the University of Texas at Austin. IGRINS employs three HAWAII-2RG focal plane array (FPA) detectors. The mechanical mounts for these detectors and for the final (field-flattening) lens in the optical train serve a critical function in the overall instrument design: Optically, they permit the only positional compensation in the otherwise “build to print” design. Thermally, they permit setting and control of the detector operating temperature independently of the cryostat bench. We present the design and fabrication of the mechanical mount as a single module. The detector mount includes the array housing, housing for the SIDECAR ASIC, a field flattener lens holder, and a support base. The detector and ASIC housing will be kept at 65 K and the support base at 130 K. G10 supports thermally isolate the detector and ASIC housing from the support base. The field flattening lens holder attaches directly to the FPA array housing and holds the lens with a six-point kinematic mount. Fine adjustment features permit changes in axial position and in yaw and pitch angles. We optimized the structural stability and thermal characteristics of the mount design using computer-aided 3D modeling and finite element analysis. Based on the computer simulation, the designed detector mount meets the optical and thermal requirements very well.

Paper Details

Date Published: 8 July 2014
PDF: 6 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914739 (8 July 2014); doi: 10.1117/12.2055651
Show Author Affiliations
Jae Sok Oh, Korea Astronomy and Space Science Institute (Korea, Republic of)
Chan Park, Korea Astronomy and Space Science Institute (Korea, Republic of)
Sang-Mok Cha, Korea Astronomy and Space Science Institute (Korea, Republic of)
In-Soo Yuk, Korea Astronomy and Space Science Institute (Korea, Republic of)
Kang-Min Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
Moo-Young Chun, Korea Astronomy and Space Science Institute (Korea, Republic of)
Kyeongyeon Ko, Korea Astronomy and Space Science Institute (Korea, Republic of)
Heeyeong Oh, Korea Astronomy and Space Science Institute (Korea, Republic of)
Ueejeong Jeong, Korea Astronomy and Space Science Institute (Korea, Republic of)
Jakyoung Nah, Korea Astronomy and Space Science Institute (Korea, Republic of)
Hanshin Lee, McDonald Observatory, The Univ. of Texas at Austin (United States)
Michael Pavel, The Univ. of Texas at Austin (United States)
Daniel T. Jaffe, The Univ. of Texas at Austin (United States)


Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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