Applicability of Optical Geometric Differentiation for Time-average Geometric Moire

摘要

Optical experimental method for analysis of derivatives of dynamic displacements from patterns of time-average moire fringes is proposed in this paper. Derived analytical relationships for one-dimensional optical model are validated for two-dimensional elastic structures performing in-plane vibrations. The fact that digital image filtering techniques are normally required for the identification of time-averaged super-fringes does not lessen the practical value of the proposed method.