MOP: an infrared multichannel occultation photometer for planetary astronomy

Shu-i Wang; Douglas W. Toomey; Jay D. Goguen; Werner E. Stahlberger; Charles P. Cavedoni; Rong Hua

doi:10.1117/12.176767

1 June 1994 MOP: an infrared multichannel occultation photometer for planetary astronomy

Shu-i Wang, Douglas W. Toomey, Jay D. Goguen, Werner E. Stahlberger, Charles P. Cavedoni, Rong Hua

Proceedings Volume 2198, Instrumentation in Astronomy VIII; (1994) https://doi.org/10.1117/12.176767
Event: 1994 Symposium on Astronomical Telescopes and Instrumentation for the 21st Century, 1994, Kailua, Kona, HI, United States

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.

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Shu-i Wang, Douglas W. Toomey, Jay D. Goguen, Werner E. Stahlberger, Charles P. Cavedoni, and Rong Hua "MOP: an infrared multichannel occultation photometer for planetary astronomy", Proc. SPIE 2198, Instrumentation in Astronomy VIII, (1 June 1994); https://doi.org/10.1117/12.176767

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KEYWORDS

Charge-coupled devices

Sensors

Infrared radiation

Optical filters

Mirrors

Photometry

Global Positioning System

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