Physics
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996cqgra..13a.185b&link_type=abstract
Classical and Quantum Gravity, Volume 13, Issue 11A, pp. A185-A191 (1996).
Physics
Scientific paper
The Gravity Probe B relativity mission experiment is designed to measure the frame dragging and geodetic relativistic precessions in a 650 km polar orbit. We describe some of the advanced experimental techniques used to achieve the required gyroscope accuracy of between 0.05 and 0264-9381/13/11A/026/img1. The subjects discussed are: (i) the development of high-precision gyroscopes with drift rates of less than 0264-9381/13/11A/026/img2, (ii) a low-temperature bake-out procedure resulting in a helium pressure of less than 0264-9381/13/11A/026/img3 at 2.5 K, (iii) a read-out system using DC SQUID magnetometers with a noise figure of 0264-9381/13/11A/026/img4 at 5 mHz and (iv) AC and DC magnetic shielding techniques which produce an AC attenuation factor in excess of 0264-9381/13/11A/026/img5 and a residual DC field of less than 0264-9381/13/11A/026/img6.
Bardas Doron
Brumley Robert
Buchman Saps
Di Donna Brian
Everitt Francis
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