Matched data storage in ESPI by combination of spatial phase shifting withtemporal phase unwrapping

We combine the spatial phase-shifting technique with the real-time fringe c ounting capability of temporal phase unwrapping to provide simple solutions for some practical tasks in ESPI. First, we develop a method for automatic ally matched data storage intervals and apply this technique to a long-term observation of a biological object with strongly varying deformation rate. Second, we easily obtain on-line displacement and deformation data during the observation of a complexly structured discontinuous object. (C) 2000 El sevier Science Ltd. All rights reserved.