Computer Science – Performance
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983spie..384..118w&link_type=abstract
IN: Generation, measurement and control of stray radiation III; Proceedings of the Meeting, Los Angeles, CA, January 18, 19, 198
Computer Science
Performance
Contamination, Field Of View, Infrared Telescopes, Spaceborne Telescopes, Background Radiation, Clean Rooms, Mirrors, Rocket-Borne Instruments, Storage
Scientific paper
Recent re-measurement of the Out-of Field-of View-Rejection (OFVR) characteristics of the ZIP telescope No. 2 indicated that the Point Source Power Transmittance (PSPT) was increased by as much as a factor of 400 at one off-axis source orientation in comparison with the OFVR measurement of the identical telescope three years ago. The OFVR degradation was caused by particulate contamination of the telescope optical surfaces. After cleaning of the primary mirror, the OFVR performance was restored for off-axis angles of 2 degrees to 7 degrees, but the OFVR was still degraded by a factor of 2 to 20 for off-axis angles between 8 degrees to 15 degrees. This remaining degradation was also restored after cleaning of the secondary mirror. Since the original OFVR measurement, the telescope package was opened about 10 times in a Class 100 clean room environment for integration and testing and was exposed to Class 100 environment 3 to 4 days at a time. Subsequently, the telescope was sealed and stored in an evacuated vessel at room temperature for two years.
Murdock Thomas L.
Wang Dongming
Wong Weng Kee
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