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Real-time speckle interferometry fringe analysis system

A real-time system for analyzing data from speckle interferometers, and speckle shearing interferometers, is presented. Interferograms are recorded by a CCD camera at a rate of 60 frames s-1, with temporal phase shifting carried out at the same rate by means of a PZT-mounted prism in the reference beam. The images are analyzed using a pipeline image processor consisting of two Datacube MaxVideo 250 VME boards. With a standard 4-frame phase-shifting algorithm, wrapped phase maps are calculated at 15 frames s-1; these are then unwrapped in real time using a temporal phase unwrapping algorithm. The main advantage of temporal over spatial unwrapping methods is that unwrapping errors due to noise and specimen boundaries do not propagate spatially. Pseudo-color maps of displacement distribution are displayed throughout the measurement period in real time. The paper is illustrated by application of the technique to the rigid body motion of a flat plate under controlled conditions.