Physics – Optics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..656..118s&link_type=abstract
IN: Contemporary optical instrument design, fabrication, and testing; Proceedings of the Meeting, Innsbruck, Austria, Apr. 17, 1
Physics
Optics
1
Accuracy, Apertures, Telescopes, Test Facilities, Geometrical Optics, Phased Arrays, Turbulence, Wave Front Reconstruction
Scientific paper
Results are reported from an experimental evaluation of (1) the subaperture technique (Kim, 1982) for testing the optics of very large telescopes, (2) the wavefront-reconstruction algorithms developed for use with this technique by Thunen and Kwon (1982) and Chow and Lawrence (1983), and (3) a new algorithm called the discrete phase method (DPM). The basic principles of the algorithms are reviewed; the experimental setup (comprising a beam expander with magnification 12.5 as the object under test, a seven-mirror subaperture array, a 514.5-nm Ar-ion laser as light source, and a digital heterodyne interferometer) is described; and the results of tests with and without externally induced turbulence are presented graphically and characterized in detail. The subaperture method and the algorithms are found to give good results if the turbulence is kept low and the aperture radius is made as large as possible. The DPM is shown to offer certain advantages over the other algorithms, but to use 5-8 times more computer time.
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