Telescope-optical system performance analysis for the Cryogenic Limb Array Etalon Spectrometer (CLAES) on the Upper Atmospheric Research SatelliteA 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.
Document ID
19850040533
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Roche, A. E. (Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Forney, P. B. (Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Morrow, H. E. (Lockheed Electro-Optics Laboratory Palo Alto, CA, United States)
Anapol, M. (Sensor Systems Group, Inc. Waltham, MA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1983
Subject Category
Spacecraft Instrumentation
Meeting Information
Meeting: Infrared technology IX
Location: San Diego, CA
Start Date: August 23, 1983
End Date: August 25, 1983
Sponsors: SPIE - International Society for Optical Engineering