Cooled Grating Fabry-Perot Spectrometer For The 10 µm Region

J. H. Lacy

doi:10.1117/12.933458

16 November 1982 Cooled Grating Fabry-Perot Spectrometer For The 10 µm Region

J. H. Lacy

Proceedings Volume 0331, Instrumentation in Astronomy IV; (1982) https://doi.org/10.1117/12.933458
Event: 1982 Astronomy Conferences, 1982, Tucson, United States

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.

Citation Download Citation

J. H. Lacy "Cooled Grating Fabry-Perot Spectrometer For The 10 µm Region", Proc. SPIE 0331, Instrumentation in Astronomy IV, (16 November 1982); https://doi.org/10.1117/12.933458

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KEYWORDS

Spectroscopy

Telescopes

Monochromators

Astronomy

Fabry–Perot interferometers

Mirrors

Sensors

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