New adaptive phase-shifting algorithm for temporal phase evaluation

摘要

The measurement of dynamic displacements using speckle interferometry and temporal phase unwrapping allows the evaluation of displacement fields without the propagation of spatial unwrapping errors. In this work we present a novel temporal phase-shifting (TPS) method 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 performance of this TPS method is compared with that of standard algorithms by using numerical simulations. The unwrapping success rate and the spatial rms phase error are evaluated, and experimental results that show the performance of this new approach are finally presented.