Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984spie..445...47w&link_type=abstract
IN: Instrumentation in astronomy V; Proceedings of the Fifth Meeting, London, England, September 7-9, 1983 (A85-25360 10-89). Be
Astronomy and Astrophysics
Astronomy
23
Cryogenic Cooling, Fabry-Perot Spectrometers, Gratings (Spectra), Infrared Spectrometers, Infrared Telescopes, Spectral Resolution, Spectral Sensitivity, United Kingdom
Scientific paper
A common-user cooled grating array spectrometer has been built for use at the Cassegrain focus of the 3.8-m UK Infrared Telescope (UKIRT). The instrument, which is designed to give resolutions of around 500 over the 1-5-micron spectral range, uses a seven-element InSb array. The exit apertures of the system are defined by the array elements so that seven almost adjacent resolution elements are sampled simultaneously. A pair of gold-coated replica gratings on copper substrates are mounted back to back to give high efficiency over the whole wavelength range. The spectrometer is mounted in a commercially available cryostat, with the optics cooled to liquid-nitrogen temperature and the array and associated electronics cooled to solid-nitrogen temperature. A number of room-temperature Fabry-Perot etalons are available which can be mounted in front of the spectrometer to increase the resolution up to 10 km/s between 2 and 5 microns. The grating spectrometer and Fabry-Perot system have both been successfully commissioned on UKIRT. Sensitivity and other test data are presented along with a description of the spectrometer, array, electronics and Fabry-Perot system.
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