A pupil-scanning device for the measurement of sensor focus on large-aperture tracking telescopes

Details A pupil-scanning device for the measurement of sensor focus on large-aperture tracking telescopes A pupil-scanning device for the measurement of sensor focus on large-aperture tracking telescopes

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007spie.6830e..19i&link_type=abstract

Advanced Sensor Systems and Applications III. Edited by Rao, Yun-Jiang; Liao, Yanbiao; Peng, Gang-Ding. Proceedings of the SPIE,

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A system that accurately positions a 35mm film camera or HDTV sensor at the infinity focus image plane of a large-aperture tracking telescope in the field is described. A beam of collimated laser light is scanned across the entrance pupil of the telescope while tracking the movement of the centroid of the image formed at the sensor. In the case of an HDTV camera, the electronic signal is sampled directly, whereas for the 35mm film camera a secondary re-imaging system is employed to capture diffusely scattered light from the film surface.

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