Development and test of an integrated focal plane star sensor for cryogenic environment operation

Statistics – Applications

Scientific paper

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Cryogenic Temperature, Focal Plane Devices, Infrared Telescopes, Pointing Control Systems, Star Trackers, Accuracy, Photovoltaic Effect, Test Equipment, Thermal Cycling Tests

Scientific paper

An integrated focal plane star sensor based on a four-quadrant detector was designed and developed for operation from ambient down to cryogenic temperature. One of the first applications of this system will be the fine pointing of the Infrared Space Observer (ISO) telescope; therefore the performance was optimized for operations around 2 K. The sensor consists of a small sensitive head, operating at cryogenic temperature with very low power consumption, and processing electronics working in the typical temperature range for space electronics. A breadboard was realized and successfully tested both at ambient temperature (with reduced accuracy) and at 20 K. The accuracy, referred to the ISO optical system, was measured to be better than 1 arcsec.

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