Development of the SPIRIT III sensor

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Abstract
Space Dynamics Laboratory of Utah State University has built the SPIRIT III sensor that will be flown aboard the Midcourse Space Experiment (MSX) spacecraft and will operate for about 20 months. The MSX mission objective is to measure the spectral, spatial, and radiometric parameters of various orbital and suborbital targets; the earth's airglow, aurora, and other upper atmospheric phenomena; and the celestial background. This paper discusses the development of the SPIRIT III sensor - the primary instrument for collecting long-wave infrared data during the MSX mission. SPIRIT III consists of a sensor system and 19 electronic units distributed near the sensor and in the electronics section. The sensor assembly consists of an extremely high off-axis-rejection telescope, a radiometer, and an interferometer, all of which are cooled to cryogenic temperatures by a solid-hydrogen-filled dewar/heat exchanger. In addition to these, there are a number of ancillary/diagnostic instruments.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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