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Test results and in-orbit operation of the Infrared Astronomical Satellite circumvention circuitThe IRAS circumvention circuit (CC) eliminates the unwanted charged-particle pulses from the IR signal. The operation of the CC along with preflight and in-orbit testing is described. Ground testing of the brassboard circuit using a simulated preamplifier output showed that the CC would perform the circumvention function as designed. When all flight detectors and preamplifiers became available, the CC was tested using a gamma source to simulate charged-particle sources; with the low energy deposited in the detectors (20 keV average) the noise was reduced by up to 5 times with the CC turned on. In-orbit results show that the CC decreases the unwanted charged-particle background noise by up to two orders of magnitude. The difference in the results with the CC on and off is so great that the science team has recommended that no data be taken with the CC off.
Document ID
19850043248
Document Type
Conference Paper
Authors
Long, E. C. (Ball Corp. Ball Aerospace Systems Div., Boulder, CO, United States)
Langford, D. (California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Subject Category
SPACECRAFT INSTRUMENTATION
Meeting Information
Instrumentation in astronomy V(London)
Funding Number(s)
CONTRACT_GRANT: NAS2-9700
Distribution Limits
Public
Copyright
Other