The telescope readout electronics for the Gravity Probe B satellite.

Details The telescope readout electronics for the Gravity Probe B satellite. The telescope readout electronics for the Gravity Probe B satellite.

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jphyc...8..175d&link_type=abstract

Journal de Physique Colloque, Vol. 8, No. 3, p. 175 - 179

Physics

Detectors: Space Instrumentation

Scientific paper

The pointing and stability requirements for the Gravity Probe B (GP-B) Relativity Mission pose a number of challenges for the star-tracking electronics. Because the telescope-gyroscope assembly operates at 2.8K, the detector circuit's Si JFETs at the telescope focal plane must be thermally isolated and heated to at least 50K through self-heating or with the aid of heating resistors. The authors have designed a low noise, thermally stable photodetector circuit that meets the GP-B requirements as well as fabricated an isolator to give the required thermal isolation and mechanical stability. Test results of the detector-isolator assembly are presented.

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