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Proceedings Paper

Resolving piston ambiguities when phasing a segmented mirror
Author(s): Mats G. Lofdahl; Henrik Eriksson
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Paper Abstract

Wavefront sensing in monochromatic light is insensitive to segment piston errors that are a whole number of waves. If the wavefront sensing is performed in several wavelengths, this ambiguity can be resolved. We give an algorithm for finding the correct phase, given multiple measurements in different wavelengths. Using this algorithm, the capture range of a wavefront sensor can be extended from on the order of +/- (lambda) /2 in piston to several waves. This relaxes the demands on an initial, coarse alignment method. The extended capture range depends on the selection of wavelengths available for phase measurements and the expected accuracy of the wavefront sensing method used.

Paper Details

Date Published: 28 July 2000
PDF: 9 pages
Proc. SPIE 4013, UV, Optical, and IR Space Telescopes and Instruments, (28 July 2000); doi: 10.1117/12.394013
Show Author Affiliations
Mats G. Lofdahl, Stockholm Observatory (Sweden)
Henrik Eriksson, Royal Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 4013:
UV, Optical, and IR Space Telescopes and Instruments
James B. Breckinridge; Peter Jakobsen, Editor(s)

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