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Proceedings Paper

Cooled Grating Infrared Spectrometer For Astronomical Observations
Author(s): J. R. Houck; G. E. Gull
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Paper Abstract

A liquid helium-cooled infrared spectrometer for the 16 to 50μm range is described. The instrument has six detectors, three each of Si:Sb and Ge:Ga and two diffraction gratings mounted back-to-back. Cold preoptics are used to match the spectrometer to the telescope. In its nominal configuration the system resolution is 0.03μm from 16 to 30μm and 0.07μm from 28 to 50μm. A cooled filter wheel is used to change order sorting filters. The gratings are driven by a steel band and gear train operating at 40 K. The detector outputs are amplified by a TIA, employing a matched pair of JFET's operating at ~70° K inside the Dewar. The external warm electronics include a gain stage for the TIA and D.C.-coupled gating circuit to remove charged-particle (cosmic-ray secondary)-induced noise spikes. The gating circuit reduces the overall system noise by a factor of two when the spectrometer is used on NASA's Kuiper Airborne Observatory. Sample spectra are presented and the deglitcher performance is illustrated.

Paper Details

Date Published: 9 August 1983
PDF: 5 pages
Proc. SPIE 0363, Advanced Remote Sensing, (9 August 1983); doi: 10.1117/12.934159
Show Author Affiliations
J. R. Houck, Cornell University (United States)
G. E. Gull, Cornell University (United States)

Published in SPIE Proceedings Vol. 0363:
Advanced Remote Sensing
Ronald G. Nishinaga, Editor(s)

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