Temporal averaging in a turbulent environment: compensation for phase drifts in phase-shifting interferometry

Ben Ovryn; E. Mark Haacke

doi:10.1117/12.135308

1 January 1992 Temporal averaging in a turbulent environment: compensation for phase drifts in phase-shifting interferometry

Ben Ovryn, E. Mark Haacke

Author Affiliations +

Proceedings Volume 1553, Laser Interferometry IV: Computer-Aided Interferometry; (1992) https://doi.org/10.1117/12.135308
Event: San Diego, '91, 1991, San Diego, CA, United States

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.

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Ben Ovryn and E. Mark Haacke "Temporal averaging in a turbulent environment: compensation for phase drifts in phase-shifting interferometry", Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); https://doi.org/10.1117/12.135308

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