Stray light analysis of CRISTA - The Cryogenic Infrared Spectrometer and Telescope of the Atmosphere

Details Stray light analysis of CRISTA - The Cryogenic Infrared Spectrometer and Telescope of the Atmosphere Stray light analysis of CRISTA - The Cryogenic Infrared Spectrometer and Telescope of the Atmosphere

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1331...64b&link_type=abstract

IN: Stray radiation in optical systems; Proceedings of the Meeting, San Diego, CA, July 12, 13, 1990 (A92-17433 05-74). Bellingh

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1

Cryogenic Equipment, Diffraction Propagation, Infrared Spectrometers, Infrared Telescopes, Middle Atmosphere, Spaceborne Telescopes, Thermal Stresses, Atmospheric Turbulence, Mirrors, Optical Equipment, Terrestrial Radiation, Wave Diffraction

Scientific paper

The CRISTA experiment is designed to detect and analyze short term upper atmospheric waves and turbulence of the middle atmosphere. This paper presents two of the more intriguing stray light characteristics of the CRISTA instrument as revealed through a much more extensive stray light analysis. The two topics are the diffraction propagation from a series of edges, and the thermal loading characteristics of the outer baffles by the earth's radiation. The interesting parameters that play very complex roles relative to each other are: CRISTA's three different telescopes peer through a common aperture; the Center Telescope has an image plane shared by two spectrometers offset above or below the axis by 0.358 deg; the point source angles walk away from one slit but across the other; the wavelength bands vary from 4 microns to 70 microns; all of the imaging mirrors are simple spherical surfaces; the major source of stray light is the earth, which is only .5 deg from the optical axis; and the intermediate field stop is oversized.

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