Phase-Shifting Speckle Interferometry

Katherine Creath

doi:10.1117/12.949561

25 November 1985 Phase-Shifting Speckle Interferometry

Katherine Creath

Proceedings Volume 0556, Intl Conf on Speckle; (1985) https://doi.org/10.1117/12.949561
Event: 29th Annual Technical Symposium, 1985, San Diego, United States

Abstract

Speckle patterns have high-frequency phase data, which make finding the absolute phase of a single speckle pattern difficult. However, the phase of the difference between two correlated speckle patterns can be determined by applying phase-shifting techniques to speckle interferometry, which will quantitatively determine the phase of double-exposure speckle measurements. The technique uses computer control to take data and calculate phase without an intermediate recording step. The randomness of the speckle causes noisy data points that are removed by data processing routines. A study of the phase errors attributable to decorrelation of the speckle patterns shows a 33° rms error for 10 waves of tilt. One application of this technique is finding the phase of deformations, where up to 10 waves of wavefront deformation can easily be measured. Results of deformations caused by tilt of a metal plate and a disbond in a honeycomb structure brazed to an aluminum plate are shown.

Citation Download Citation

Katherine Creath "Phase-Shifting Speckle Interferometry", Proc. SPIE 0556, Intl Conf on Speckle, (25 November 1985); https://doi.org/10.1117/12.949561

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