Computer Science – Performance
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983spie..428..106r&link_type=abstract
IN: Infrared technology IX; Proceedings of the Ninth Annual Meeting, San Diego, CA, August 23-25, 1983 (A85-22673 09-35). Bellin
Computer Science
Performance
Cryogenic Cooling, Fabry-Perot Spectrometers, Infrared Spectrometers, Scientific Satellites, Spaceborne Telescopes, Upper Atmosphere, High Resolution, Linear Arrays, Mirrors, Reflecting Telescopes, Spectral Reflectance, Spectral Resolution
Scientific paper
A first-order performance analysis of the CLAES telescope-optical system is presented. The experiment involves the passive measurement of earth-limb radiance over a 10-60 km tangent altitude range, and is based on a solid Fabry-Perot spectrometer which provides spectral resolution of 0.25/cm for atmospheric emission spectroscopy over the 3.5-12 micron IR range. The optical system is required to provide a high degree of off-axis rejection and stray-light control, primarily to suppress intense emission from the earth surface. The astigmatism and other geometric aberrations are corrected by a secondary mirror which produces an excellent image of the primary one, allowing for location of a diffraction control or Lyot stop. The off-axis scattering performance of the telescope is examined in terms of the mirror scatter coefficient and point source rejection ratio. A mirror bidirectional reflectance distribution function of 0.0001 at 1 deg with a 1/theta-squared roll-off between 1 and 0.2 deg is realizable based on recent measurements. This results in an off-axis radiance term that is generally small in comparison with the system-limiting NER.
Anapol Michael
Forney P. B.
Morrow H. E.
Roche Aidan E.
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