In the conventional moire method, a moire pattern appears as interference between a model grating and a master grating. However, a moire pattern also appears when the model grating lines are sampled by a TV camera. If the scanning lines of the TV camera are regarded as the master grating lines, the geometric relations among the moire fringe lines, the model grating lines and the scanning lines are obtained in the same way as the conventional moire method. When the TV camera scanning lines are thinned out, this method corresponds to a mismatch method in the conventional moire method. We call this the “Scanning-moire Method” (Morimoto 1984).
KeywordsStrain Distribution Fringe Pattern Scanning Line Stainless Steel Plate Geometric Relation
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