Design for a 1-5-micron cryogenic echelle spectrograph for the NASA IRTF

Details Design for a 1-5-micron cryogenic echelle spectrograph for the NASA IRTF Design for a 1-5-micron cryogenic echelle spectrograph for the NASA IRTF

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1235..131t&link_type=abstract

IN: Instrumentation in astronomy VII; Proceedings of the Meeting, Tucson, AZ, Feb. 13-17, 1990 (A91-29601 11-35). Bellingham, WA

Physics

Optics

61

Cryogenic Cooling, Design Analysis, Echelle Gratings, Infrared Spectrometers, Infrared Telescopes, Arrays, Cassegrain Optics, Collimation, Data Acquisition, Ray Tracing

Scientific paper

The design of an infrared cryogenic echelle spectrograph for use on the NASA Infrared Telescope Facility is described. The resolving power achieved over the range 1-5.4 microns is 1-40,000 with slit widths of 2.0-0.5 arcsec. The spectrograph is used in a single order with a 30-arcsec-long slit. No cross dispersion is provided because of the small number of orders that can be observed at once and the need to keep the instrument as small as possible. A closed-cycle cooler is used in lieu of cryogens in order to achieve greater reliability and ease of use at the telescope. The optical layout, the design philosophy, the modes of operation, and the construction details are provided.

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