Recent advances in temporal phase-shifting speckle interferometry

Pablo D. Ruiz; Jonathan Mark Huntley; Guillermo H. Kaufmann

doi:10.1117/12.516654

27 May 2003 Recent advances in temporal phase-shifting speckle interferometry

Pablo D. Ruiz, Jonathan Mark Huntley, Guillermo H. Kaufmann

Proceedings Volume 4933, Speckle Metrology 2003; (2003) https://doi.org/10.1117/12.516654
Event: Speckle Metrology 2003, 2003, Trondheim, Norway

Abstract

Temporal phase-shifting speckle interferometry (TPSSI) is a technique based on the recording of a sequence of speckle interferograms throughout the entire deformation history of an object. To calculate the phase map, a controlled phase change is introduced in the reference beam as a function of time. As temporal phase unwrapping involves only one-dimensional signals, this procedure is generally easier to carry out than 2-D spatial unwrapping. TPSSI also allows large-object absolute displacement fields to be obtained. This paper provides an overview of recent developments and applications of temporal phase-shifting speckle interferometry. These include the performance of different phase-shifting algorithms when a TPSSI system is used in the presence of harmonic and random vibrations and also for measuring mechanical vibrations. A novel adaptive phase-shifting algorithm is also presented that searches for the peak of the windowed Fourier transform of the modulated intensity signal and evaluates the phase at that frequency instead of at the carrier frequency. The presentation is illustrated with an application of TPSSI to the detection of sub-surface delamination defects in carbon fiber specimens submitted to vacuum loading. It is shown that re-referencing the temporal phase unwrapping algorithm after different time intervals allows the measurement of time-varying displacements in excess of 100 μm without the limit normally imposed by speckle decorrelation.

Citation Download Citation

Pablo D. Ruiz, Jonathan Mark Huntley, and Guillermo H. Kaufmann "Recent advances in temporal phase-shifting speckle interferometry", Proc. SPIE 4933, Speckle Metrology 2003, (27 May 2003); https://doi.org/10.1117/12.516654

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KEYWORDS

Fourier transforms

Phase shifts

Phase shift keying

Cameras

Modulation

Speckle

Speckle interferometry

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