Vacuum focus testing of large telescopes

Details Vacuum focus testing of large telescopes Vacuum focus testing of large telescopes

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007spie.6677e..10l&link_type=abstract

Earth Observing Systems XII. Edited by Butler, James J.; Xiong, Jack. Proceedings of the SPIE, Volume 6677, pp. 66770B (2007).

Computer Science

Scientific paper

The advent of large telescopes for remote sensing presents special challenges for optical testing, particularly for verifying focal plane array alignment. If testing in air, the large well-enclosed telescope cavity can create air stagnation or thermal gradient effects that can distort the optical wavefront unpredictably, resulting in noisy and inaccurate measurements. Testing in vacuum presents instrumentation challenges but eliminates the air effects and provides excellent data. This paper describes the experimental setups and compares through-focus test results for a large remote sensing telescope when tested in both air and in a vacuum.

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