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Proceedings Paper

Cryotransmittance and -reflectance of filters and beamsplitters for the SIRTF infrared array camera
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Paper Abstract

The Space Infrared Telescope Facility Infrared Array Camera (IRAC) uses two dichroic beamsplitters, four bandpass filters, and four detector arrays to acquire images in four channels at wavelengths between 3 and 10 micrometers . Accurate knowledge of the pass bands is necessary because, in order to meet the science objectives, IRAC is required to do 2% relative photometry in each band relative to the other bands. We report the in-band and out-of-band polarized transmittance and reflectance of these optical elements measured near the instrument operating temperature of 1.4 K. Details of the experimental apparatus, which include a continuous flow liquid helium optical cryostat and a Fourier transform infrared spectrometer are discussed.

Paper Details

Date Published: 16 November 2000
PDF: 10 pages
Proc. SPIE 4131, Infrared Spaceborne Remote Sensing VIII, (16 November 2000); doi: 10.1117/12.406543
Show Author Affiliations
Kenneth P. Stewart, NASA Goddard Space Flight Ctr. (United States)
Manuel A. Quijada, Genesis Engineering Co., LLC (United States)

Published in SPIE Proceedings Vol. 4131:
Infrared Spaceborne Remote Sensing VIII
Marija Strojnik; Bjorn F. Andresen, Editor(s)

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