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Proceedings Paper

High-accuracy white-light optical piston sensor for segmented optics
Author(s): Alan Wertheimer; Thomas William Dey
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Paper Abstract

A novel piston sensing concept is described for measuring piston over the +/- 0.5 wave range. The image of a white light point source is optically processed using a half-wave phase plate to enhance the presence of piston in the incident wavefront. The resultant point spread function is recorded on a CCD camera and analyzed using a simple intensity balance algorithm. Theoretical derivation and experimental results are provided, with emphasis on piston values below 0.25 waves. Piston values are measured to +/- 1/200 wave accuracy or better with a repeatability on the order of +/- 1/1000 wave.

Paper Details

Date Published: 5 February 1993
PDF: 10 pages
Proc. SPIE 1755, Interferometry: Techniques and Analysis, (5 February 1993); doi: 10.1117/12.140758
Show Author Affiliations
Alan Wertheimer, Eastman Kodak Co. (United States)
Thomas William Dey, Eastman Kodak Co. (United States)

Published in SPIE Proceedings Vol. 1755:
Interferometry: Techniques and Analysis
Gordon M. Brown; Osuk Y. Kwon; Malgorzata Kujawinska; Graeme T. Reid, Editor(s)

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