| Numéro |
J. Phys. IV France
Volume 08, Numéro PR3, June 1998
Proceedings of the 3rd European Workshop on Low Temperature ElectronicsWOLTE 3 |
|
|---|---|---|
| Page(s) | Pr3-175 - Pr3-179 | |
| DOI | https://doi.org/10.1051/jp4:1998338 | |
Proceedings of the 3rd European Workshop on Low Temperature Electronics
WOLTE 3
J. Phys. IV France 08 (1998) Pr3-175-Pr3-179
DOI: 10.1051/jp4:1998338
1 Advanced Technology Center, GP-B Lockheed Martin Missiles and Space, Bldg. 251, 3251 Hanover Street, Palo Alto CA 94304, U.S.A.
2 Ball Aerospace and Technologies Corp., Boulder, Colorado, U.S.A.
3 W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford CA 94305, U.S.A.
4 Hughes/STX. Lanham, Maryland, U.S.A.
5 Aeronautics and Astronautics Department, Stanford University, Stanford CA 94305, U.S.A.
6 Sensors and Instrumentation Branch, NASA Ames Research Center, Moffett Field CA 94305, U.S.A.
7 NASA Goddard Space Flight Center, Greenbelt, Maryland, U.S.A.
8 Atlas Scientific, 713 San Conrado Terrace, Sunnyvale CA 94086, U.S.A.
© EDP Sciences 1998
WOLTE 3
J. Phys. IV France 08 (1998) Pr3-175-Pr3-179
DOI: 10.1051/jp4:1998338
The telescope readout electronics for the Gravity Probe B satellite
H.P. Demroff1, S. Babu2, M.R. Bye3, K.L. Coleman1, N. Das4, D.B. DeBra5, P.D. Ehrensberger Jr.3, R.P. Farley1, D.K. Gill3, J.H. Goebel6, M. Jhabvala7, A. Kashani8, E. Romero3 and M.T. Sullivan31 Advanced Technology Center, GP-B Lockheed Martin Missiles and Space, Bldg. 251, 3251 Hanover Street, Palo Alto CA 94304, U.S.A.
2 Ball Aerospace and Technologies Corp., Boulder, Colorado, U.S.A.
3 W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford CA 94305, U.S.A.
4 Hughes/STX. Lanham, Maryland, U.S.A.
5 Aeronautics and Astronautics Department, Stanford University, Stanford CA 94305, U.S.A.
6 Sensors and Instrumentation Branch, NASA Ames Research Center, Moffett Field CA 94305, U.S.A.
7 NASA Goddard Space Flight Center, Greenbelt, Maryland, U.S.A.
8 Atlas Scientific, 713 San Conrado Terrace, Sunnyvale CA 94086, U.S.A.
Abstract
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 2.8 K, the detector circuit's Si JFETs at the telescope focal plane must be thermally isolated and heated to at least 50 K through self-heating or with the aid of heating resistors. We 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.
© EDP Sciences 1998