Application of wavelet-transform to measurement of phase of Isodyne fringe

摘要

Isodyne, as an experimental measurement method, can analyze the inner stresses without destroying the specimen. It is unnecessary to use high-power laser as light source, and the equipments of the experiment are simple. Moreover, the fringe of the pattern is clear and undistorted. Previously, making use of phase shift, phase of Isodyne fringe can be determined through four patterns. In this paper, wavelet-transform is applied to the phase analysis of Isodyne fringe, and all the results are satisfied. With the method of wavelet transform, we can determine the phase of Isodyne fringe automatically and accurately with only a single pattern. Furthermore, all the processing can be programmed, so it is easy to realize automatic analysis.