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Proceedings Paper

ISOPHOT-S: a low-resolution, near-infrared spectrometer for ISO
Author(s): Martyn Wells
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Paper Abstract

The optical design of Isophot-S, the low-resolution NIR spectrophotometer for the IR Space Observatory (ISO), is described and illustrated with drawings and graphs of test data. The ISO is to be launched in 1993 as a successor to IRAS for astronomical surveys at 2.5-200 microns. Isophot-S has an aperture of 24 arcsec sq, and the two 64-pixel Si:Ga detector arrays have noise-equivalent power of about 5 x 10 to the -17th W/sq rt Hz at 15 microns, corresponding to 1-sigma 1-sec detection sensitivity 400 mJy for a point source at 12 microns or surface brightness 0.8 mJy/sq arcsec for an extended source. The system comprises two grating spectrometers, one operating at 2.5-5 microns with resolution 40 nm and one operating at 6-12 microns with resolution 90 nm.

Paper Details

Date Published: 1 July 1990
PDF: 9 pages
Proc. SPIE 1235, Instrumentation in Astronomy VII, (1 July 1990); doi: 10.1117/12.19154
Show Author Affiliations
Martyn Wells, Imperial College of Science, Technology, and Medicine (United Kingdom)

Published in SPIE Proceedings Vol. 1235:
Instrumentation in Astronomy VII
David L. Crawford, Editor(s)

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