Wide-range, high-accuracy, white light piston sensor for segmented optics

Alan Wertheimer; Thomas William Dey

doi:10.1117/12.206582

1 July 1995 Wide-range, high-accuracy, white light piston sensor for segmented optics

Alan Wertheimer, Thomas William Dey

Author Affiliations +

Optical Engineering, Vol. 34, Issue 7, (July 1995). https://doi.org/10.1117/12.206582

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.

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Alan Wertheimer and Thomas William Dey "Wide-range, high-accuracy, white light piston sensor for segmented optics," Optical Engineering 34(7), (1 July 1995). https://doi.org/10.1117/12.206582

Published: 1 July 1995

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