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Flight Model Development of a Compact Imaging Spectrometer for a Microsatellite STSAT3

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Abstract

COMIS is a very compact imaging spectrometer for a ~150kg micro-satellite STSAT3. COMIS images the Earth’s surface and atmosphere with ground sampling distances of ~30 m in the 18~62 spectral bands (0.4~1.05 μm) for the nadir looking at an altitude of 700km. COMIS, as its name implies, is very compact in terms of volume, mass, and power. The total mass including the optics, housing, and electronics is approximately 4.3kg, and the average operational power is less than 13 watts. The optics of COMIS consists of two parts; imaging telescope and dispersing relay optics. The imaging telescope, f/4.6 Mangin telescope, forms an image of the Earth’s surface onto an intermediate image plane, i.e. a slit. The dispersion relay optics disperses the image while relaying it onto a CCD plane. The optics of COMIS is designed with all spherical surfaces and utilizes only single glass material (fused silica) and mirrors, for the easiness of manufacture, alignment, assemble and test, and the improved robustness over the space environment. An engineering-qualification model had been developed in order to validate the previous design/analysis. Currently a flight model of COMIS is under development.

© 2010 Optical Society of America

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