The Infrared Space Observatory Camera

Details The Infrared Space Observatory Camera The Infrared Space Observatory Camera

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994exa.....3..101c&link_type=abstract

Experimental Astronomy, vol. 3, no. 1-4, p. 101-108

Astronomy and Astrophysics

Astronomy

1

Arrays, Cameras, Focal Plane Devices, Infrared Astronomy, Infrared Detectors, Infrared Space Observatory (Iso), Infrared Telescopes, Spaceborne Astronomy, Spaceborne Telescopes, Bandpass Filters, Calibrating, Charge Injection Devices, Cryogenic Equipment, Mirrors

Scientific paper

At the focal plane of the Infrared Space Observatory (ISO) 60 cm telescope, the ISO Camera (ISOCAM) will take images of the sky in the wavelength range 2.5 to 17 micrometer. It features two independent channels, containing each a 32 x 32 array detector. The long wavelength (4-17 micrometer) detector, developed by LIR-LETI specifically for ISOCAM, is a Si:Ga array bonded with indium bumps to a DV readout circuit. The short wavelength (2.5-5.5 micrometer) detector, developed by SAT, is an InSb array with a charge injection device (CID) readout. Only one channel operates at a time. The channel selection is obtained with two field mirrors supported by a wheel. The field mirror in operation is in the focal plane of the telescope, covering the 3 arcmin field of view, and reflecting the light into one or into the other channel. In each channel, 10 or 12 discrete band pass filters and circular variable filters (CVFs) with resolution 45 are mounted on a wheel. A second wheel supports a set of lenses, which reimage the focal plane of the telescope on the array, with a pixel field of view of 1.5, 3, 6, or 12 arcsec. Two integrating spheres, illuminated through small holes by black body sources, are mounted on the selection wheel, for flat fielding and calibration purposes. The flight model of ISOCAM, fuly tested and calibrated, has been, delivered to the European Space Agency (ESA) and is ready to be integrated in the satellite, whose expected launch data is September 1995.

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