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Proceedings Paper

MOP: an infrared multichannel occultation photometer for planetary astronomy
Author(s): Shu-i Wang; Douglas W. Toomey; Jay D. Goguen; Werner E. Stahlberger; Charles P. Cavedoni; Rong Hua
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Paper Abstract

The design of a multichannel occultation photometer built under NASA contract to SETS Technology, Inc., for the NASA 3-m IR telescope facility (IRTF) and the JPL Table Mountain telescope is described. This instrument acquires data in four selectable passbands (two 1 to 5 micrometers channels and two 10 to 20 micrometers channels), with very high sensitivity and approximately 100% duty cycle on-source during chopping. The optics are optimized for uniform response across an aperture of up to 20 arcseconds on the IRTF. The cryogenic system is a two-can cryostat with one liquid nitrogen can for cooling the radiation shields, optics, filters, and baffles, and a liquid helium can for cooling the IR detectors. The instrument operates two types of IR detector technologies. The 1 to 5 micrometers detectors are low-capacitance, single-element InSb detectors. The 10 micrometers detectors are blocked impurity band detectors. The instrument also has a 64 by 64 visible CCD array as an additional channel for guiding and visible photometry. A global positioning system unit is incorporated into the system for time and location stamping of occultation events. The instrument design and construction are discussed.

Paper Details

Date Published: 1 June 1994
PDF: 13 pages
Proc. SPIE 2198, Instrumentation in Astronomy VIII, (1 June 1994); doi: 10.1117/12.176767
Show Author Affiliations
Shu-i Wang, SETS Technology, Inc. (United States)
Douglas W. Toomey, Tech Group (United States)
Jay D. Goguen, Jet Propulsion Lab. (United States)
Werner E. Stahlberger, Cadservices (United States)
Charles P. Cavedoni, Hakalau Engineering (United States)
Rong Hua, Hakalau Engineering (United States)

Published in SPIE Proceedings Vol. 2198:
Instrumentation in Astronomy VIII
David L. Crawford; Eric R. Craine, Editor(s)

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