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Proceedings Paper

Temporal averaging in a turbulent environment: compensation for phase drifts in phase-shifting interferometry
Author(s): Ben Ovryn; E. Mark Haacke
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Paper Abstract

In an effort to improve the signal to noise in an interference experiment, we have developed a method to remove systematic phase drift between data sets acquired over long time intervals. Using this technique, it is possible to average repeatedly acquired phase measurements and improve the phase estimate without sacrificing spatial resolution. Results from tests using real-time phase stepping holographic interferometry applied to cantilever bending of a piezoelectric bimorph indicate that white noise has been reduced from 3 to less than 1 deg (lambda/360) by averaging 36 phase compensated data sets before object bending and 36 data sets after bending.

Paper Details

Date Published: 1 January 1992
PDF: 10 pages
Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); doi: 10.1117/12.135308
Show Author Affiliations
Ben Ovryn, Case Western Reserve Univ. (United States)
E. Mark Haacke, Case Western Reserve Univ. (United States)


Published in SPIE Proceedings Vol. 1553:
Laser Interferometry IV: Computer-Aided Interferometry
Ryszard J. Pryputniewicz, Editor(s)

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