Out Of Field Of View Rejection Measurements Of The ZIP Telescope #2

Wallace K. Wong; Dexter Wang; Thomas L. Murdock

doi:10.1117/12.934952

4 October 1983 Out Of Field Of View Rejection Measurements Of The ZIP Telescope #2

Wallace K. Wong, Dexter Wang, Thomas L. Murdock

Proceedings Volume 0384, Generation, Measurement and Control of Stray Radiation III; (1983) https://doi.org/10.1117/12.934952
Event: 1983 Los Angeles Technical Symposium, 1983, Los Angeles, United States

Abstract

Recent re-measurement of the Out-of Filed-of View-Rejection (OFVR) characteristics of the ZIP telescope #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 intergration 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.

Citation Download Citation

Wallace K. Wong, Dexter Wang, and Thomas L. Murdock "Out Of Field Of View Rejection Measurements Of The ZIP Telescope #2", Proc. SPIE 0384, Generation, Measurement and Control of Stray Radiation III, (4 October 1983); https://doi.org/10.1117/12.934952

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