Overview of contamination effects on the performance of high-straylight-rejection telescopes via ground measurements

Autor:	Wallace K. Wong, James J. Guregian, Robert T. Benoit
Rok vydání:	1990
Předmět:	Power supply rejection ratio Contamination control Stray light business.industry Cryogenics Contamination law.invention Telescope Optics law Radiance Environmental science Bidirectional reflectance distribution function business Remote sensing
Zdroj:	SPIE Proceedings.
ISSN:	0277-786X
DOI:	10.1117/12.22587
Popis:	The contamination control of telescopes with the straylight-rejection capability is reviewed to identify the degradative effects of contaminant phenomena on the measurements. Three levels of optical contamination are discussed including bidirectional reflectance distribution function (BRDF), point-source rejection ratio (PSRR), and nonrejected earth radiance (NRER). Measurements of degradation to low-scatter surfaces are set forth for the Zip telescope during storage and for the Cirris 1A telescope performance. PSRR measurements indicate that the Cirris 1A degraded by a factor of 15 during ground testing. A portable external BRDF station is described that measured cryogenic BRDF and BRDF degradation over the life of the Cirris 1A telescope. The optical contamination measurement described are concluded to be important to both determining the causes of degradation and optimizing telescope performance.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d81ec2bd7cc5c56b7a148691f4f6d0b7 https://doi.org/10.1117/12.22587 Zobrazit plný text záznamu