Abstract
New holographic-moire methods are presented to obtain strain fringe patterns. To introduce two carriers of different directions, two kinds of recording procedures are proposed: (1) triple-exposure recording by two object beams and one reference beam (all of these beams are identical in polarization state) and (2) double exposure or real-time recording by two orthogonally polarized object beams and two corresponding reference beams. In these recordings, the carriers are introduced by changing the directions of the reference beams and are modulated by deformation. Separated in-plane displacement derivative patterns are then obtained by optical processings. Both the principles and the experimental results are shown in the paper.
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