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Proceedings Paper • Open Access

Vibration insensitive interferometry

Paper Abstract

The largest limitation of phase-shifting interferometry for optical testing is the sensitivity to the environment, both vibration and air turbulence. An interferometer using temporal phase-shifting is very sensitive to vibration because the various phase shifted frames of interferometric data are taken at different times and vibration causes the phase shifts between the data frames to be different from what is desired. Vibration effects can be reduced by taking all the phase shifted frames simultaneously and turbulence effects can be reduced by averaging many measurements. There are several techniques for simultaneously obtaining several phase-shifted interferograms and this paper will discuss two such techniques: 1) Simultaneous phase-shifting interferometry on a single detector array (PhaseCam) and 2) Micropolarizer phase-shifting array. The application of these techniques for the testing of large optical components, measurement of vibrational modes, the phasing of segmented optical components, and the measurement of deformations of large diffuse structures is described.

Paper Details

Date Published: 21 November 2017
PDF: 8 pages
Proc. SPIE 10567, International Conference on Space Optics — ICSO 2006, 105671P (21 November 2017); doi: 10.1117/12.2308094
Show Author Affiliations
James Millerd, 4D Technology Corp. (United States)
Neal Brock, 4D Technology Corp. (United States)
John Hayes, 4D Technology Corp. (United States)
Brad Kimbrough, 4D Technology Corp. (United States)
Michael North-Morris, 4D Technology Corp. (United States)
James C. Wyant, Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 10567:
International Conference on Space Optics — ICSO 2006
Errico Armandillo; Josiane Costeraste; Nikos Karafolas, Editor(s)

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