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Proceedings Paper

Cooled Grating Fabry-Perot Spectrometer For The 10 µm Region
Author(s): J. H. Lacy
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Paper Abstract

A spectrometer optimized for measurement of narrow spectral features in the 10 pm atmospheric window has been constructed and used for astronomical observations. The instrument consists of a LN2 cooled, piezoelectrically scanned, Fabry-Perot interferometer and a LHe cooled grating monochromator and Si:As photoconductive detector. The Fabry-Perot has been used with a free spectral range of 3-10 cm-1 and a resolution of 0.07-0.3 cm-1. The grating, which isolates a single order of the Fabry-Perot, has a resolution of typically 2 cm-1 with an entrance aperture corresponding to 6" on a 3m telescope. The system sensitivity, which is photon shot noise limited, is 2x10-14WHz-1/2 , including all losses in the spec-trometer, telescope, and atmosphere, and due to chopping. The instrument can be used as a scanning spectrometer to measure line shapes and fluxes or as a monochromator to allow emission-line mapping of nebulae. Astronomical applications have included observations of the motion and distribution of the ionized gas in the Galactic center and first detections of H2 S(2) at 12.28 μm and H I Humphreys a at 12.37 μm.

Paper Details

Date Published: 16 November 1982
PDF: 6 pages
Proc. SPIE 0331, Instrumentation in Astronomy IV, (16 November 1982); doi: 10.1117/12.933458
Show Author Affiliations
J. H. Lacy, University of California (United States)

Published in SPIE Proceedings Vol. 0331:
Instrumentation in Astronomy IV
David L. Crawford, Editor(s)

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