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Proceedings Paper

Cryogenic Star-Tracking Telescope For Gravity Probe B
Author(s): C. W. F. Everitt; D. E. Davidson; R. A. Van Patten
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Paper Abstract

This paper describes the design, development and preliminary testing of the cryogenic star-tracking telescope used as an optical reference for the gyroscopes in the Gravity Probe B Relativity Gyroscope experiment. The telescope is operated at 1.8 K; it is fabricated entirely from fused quartz components held together by optical contacting; it has a physical length of 14 in, a focal length of 150 in and an aperture of 5.6 in. Readout is by two photomultiplier chopper-detector assemblies at ambient satellite temperature. When fully operational the telescope may be expected to have a precision approaching 0.1 marc-s over a linear range of ±70 marc-s. Its projected noise performance corresponds to an angular resolution of 1 marc-s in 1 Hz bandwidth. The paper includes a theoretical analysis, a description of the design and fabrication of a laboratory version of the telescope, a discussion of techniques of optical contacting, an account of vibration tests on a separate mass model of the telescope, a description of the artificial star developed for optical tests, and an account of preliminary experimental results.

Paper Details

Date Published: 18 July 1986
PDF: 31 pages
Proc. SPIE 0619, Cryogenic Optical Systems and Instruments II, (18 July 1986); doi: 10.1117/12.966643
Show Author Affiliations
C. W. F. Everitt, Stanford University (United States)
D. E. Davidson, Optical Instrument Design Company (United States)
R. A. Van Patten, Stanford University (United States)

Published in SPIE Proceedings Vol. 0619:
Cryogenic Optical Systems and Instruments II
Ramsey K. Melugin, Editor(s)

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