This paper presents a method for measuring time dependent displacement using a dual speckle pattern acquisition and single camera TV holographic system. Two speckle patterns with 90 degree phase difference are acquired simultaneously. As the displacement changes with respect to time, a series of dual speckle patterns can be digitized into a computer image processing system. A Fourier transformation is used to remove the DC terms of the speckle patterns. A phase unwrapping algorithm is employed to calculate the phase distribution related to the time dependent displacement. The theoretical concept together with experimental simulation are presented.
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