Matched spatial-phase-shifting for the temporal-phase-unwrapping in electronic speckle pattern interferometry

Abstract

Summary A synchronous combination spatial-carrier phase-shifting and temporal-phase-unwrapping techniques is proposed to reduce the frame acquisition time of the standard temporal phase unwrapping used in electronic speckle pattern interferometry. The proposed technique is robust against problems associated with the temporal phase shifting method, such as nonlinear phase shift and noise. The method allows us to extend the displacement measurement range and to reduce the processing time of the temporal phase unwrapper by a factor of 4.