Cryogenic Michelson interferometer spectrometer for Space Shuttle application

Physics – Optics

Scientific paper

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Beam Splitters, Cryogenic Cooling, Infrared Detectors, Infrared Interferometers, Michelson Interferometers, Space Shuttle Payloads, Focal Plane Devices, Helium-Neon Lasers, Liquid Helium, Optical Fibers, Spaceborne Telescopes, Upper Atmosphere

Scientific paper

The design and nominal performance of the Michelson interferometer spectrometer (MIS) for the CIRRIS (Cryogenic IR Radiation Instrumentation for Shuttle) program are presented in diagrams, drawings, and tables of numerical data and discussed. The CIRRIS-1A MIS is designed to operate in the spectral range 2.5-25 microns at temperature 20 K. Design features include a moving mirror with a flexural-pivot suspension; a specially mounted KBr beamsplitter; a five-element Si:As focal-plane array; f/1.6 Ritchey-Chretien focal-plane optics; an eight-position filter wheel; a redundant mirror-position reference system (linked to the optical modulator via optical fibers); a geared step-motor alignment system; and wideband, quasi-blackbody, alignment, off-axis, photon-bias, detector-stimulator, and cold internal calibration sources.

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