部分相干光云纹干涉法测三维位移场

本文提出了一种用部分相干光可同时获得面内位移和离面位移场的云纹干涉法。该法具有装置简单,无需防震,可用于观场测量等特点。文中论述了此法的基本原理,应用波前干涉理论和付里叶光学理论对变形前后波前的干涉、记录和再观进行了分析,导出了计算公式。实现了透射物体和反射物体表面的面内位移分量(U_0,V_(45),U_(90))和离面位移(w)的全场同时测量,典型实验证明,实验值与计算结果符合较好。

THREE-DIMENSIONAL DISPLACEMENT-FIELD MEASURED BY PARTIALLY COHERENT LIGHT MOIRE INTERFEROMETRY

This paper presents a method to measure the three dimensional displacement field, the in-plane and the out-of-plane conponents, by partially coherent light Moire interfer-rometry. It needs simple optical set-up and low demand on vibration isolation, and is valid for the measurement of the displacements on the sarface of engineering structures.The related formulas are derived by the theories of wave-front inteference and Fourir op-ties. The in-plane (v0 v45, v90) and the out-of-plane(w) displacement fields are obtained simultaneously from either transparent or opaque specimens of which the test data agree well with the theoretical ones.