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Proceedings Paper

Phase measuring deflectometry for determining 5 DOF misalignment of segmented mirrors
Author(s): Angela Davies; Trent Vann; Christopher Evans; Mark Butkiewicz
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Paper Abstract

Alternative techniques for measurement of misalignment in a segmented mirror are of interest to the telescope community in the limit of large misalignment that precludes interferometric tracking. A variation of phase measuring deflectometry can be used to determine 5 degrees of freedom (DOF) of the misalignment with knowledge of the remaining 1 DOF. A camera and screen are positioned near the center of curvature, and the camera collects images of the screen pattern reflected from the mirror. In this application, the form of each segmented mirror is assumed known, so the misalignment contribution to the measurement can be determined. The approach is based on a Zernike analysis of distorted fringe patterns and the sensitivity to misalignment. We discuss simulation results in this paper.

Paper Details

Date Published: 23 August 2017
PDF: 10 pages
Proc. SPIE 10373, Applied Optical Metrology II, 103730H (23 August 2017); doi: 10.1117/12.2276947
Show Author Affiliations
Angela Davies, The Univ. of North Carolina at Charlotte (United States)
Trent Vann, The Univ. of North Carolina at Charlotte (United States)
Christopher Evans, The Univ. of North Carolina at Charlotte (United States)
Mark Butkiewicz, SURVICE Engineering Co. (United States)

Published in SPIE Proceedings Vol. 10373:
Applied Optical Metrology II
Erik Novak; James D. Trolinger, Editor(s)

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