A new real-time phase-shifting readout system is developed for quantitative evaluation of full-field correlation fringes obtained by means of Fourier filtering in speckle photography. The proposed method, which uses photorefractive crystals as the recording medium, is capable of mapping the whole-field displacement data from the recorded phase-shifted fringe patterns. Experimental results are presented on a diffuse surface subjected to rotation in its own plane.
© 2002 Optical Society of America
(050.5080) Diffraction and gratings : Phase shift
(110.6150) Imaging systems : Speckle imaging
(120.3940) Instrumentation, measurement, and metrology : Metrology
(160.5320) Materials : Photorefractive materials
N. Krishna Mohan and Pramod Rastogi, "Phase-shifting whole-field speckle photography technique for the measurement of in-plane deformations in real time," Opt. Lett. 27, 565-567 (2002)