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Optical Engineering

Wide-range, high-accuracy, white light piston sensor for segmented optics
Author(s): Alan Wertheimer; Thomas William Dey
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Paper Abstract

Optical systems with segmented mirrors require precision coalignment of their segments to attain the desired performance. A novel sensor for measuring piston over a ± 10 wave range by analyzing the image of a white light point source is described. The sensor combines a Young's two-slit aperture pair for coarse sensing with another set of apertures, which include a phase retardation portion for fine sensing. The course sensor has an accuracy of ± 0.25 wave over the full range. The fine sensor works within ± 0.5 wave of zero with ± 0.005 wave accuracy, and a repeatability of the order of ± 0.001 wave. Theoretical derivation and experimental results are provided.

Paper Details

Date Published: 1 July 1995
PDF: 8 pages
Opt. Eng. 34(7) doi: 10.1117/12.206582
Published in: Optical Engineering Volume 34, Issue 7
Show Author Affiliations
Alan Wertheimer, Eastman Kodak Co. (United States)
Thomas William Dey, Eastman Kodak Co. (United States)

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