用错位云纹法测量位移导数场

Measurement of Derivatives Field of Displacement Using Shearing Moire Method

采用衍射光栅在谱平面上滤波的光学系统，提出两次曝光之间在像平面上错动全息干版的错位云纹干涉法。用此方法分别获得面内位移导数（应变）场和平板弯曲离面位移的二阶导数（曲率）场的计算公式，并进行了实验验证，实验结果与理论值符合良好。

This paper presents a shearing Moire interferometry of shifting the holographic plate in the imaging plate between two exposures .In the arrangement, a diffraction grating as well as the filtering system is used. With this method ,the formulas of derivatives fields of in-plane displacement (strain) and derivatives fields of out -plane displacement(curvature) are obtained respectively. In the experiments, the results agree well with the theoretical ones.