ISOPHOT-S: a low-resolution, near-infrared spectrometer for ISO

Martyn Wells

doi:10.1117/12.19154

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1 July 1990 ISOPHOT-S: a low-resolution, near-infrared spectrometer for ISO

Martyn Wells

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Proceedings Volume 1235, Instrumentation in Astronomy VII; (1990) https://doi.org/10.1117/12.19154
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

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.

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Martyn Wells "ISOPHOT-S: a low-resolution, near-infrared spectrometer for ISO", Proc. SPIE 1235, Instrumentation in Astronomy VII, (1 July 1990); https://doi.org/10.1117/12.19154

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