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本文将一特殊布置的云纹干涉系统和一垂直入射试件栅的麦克尔逊干涉系统组和起来,利用云纹干涉系统测量两个面内位移分量U、V,垂直入射的麦克尔逊干涉系统测量离面位移分量 W。调节云纹干涉系统中入射光的入射角,使正、负一级衍涉波的传播方向偏离开试件栅法向一微小角度,从而使一级衍涉波的频谱点与麦克尔逊干涉系统中的零级衍涉波的频谱点在频谱面上分开。利用小反射镜的反射来改变一级衍射波的传播方向,从而使我们在三个彼此分开的成像面上同步实时观测到三维位移场的条纹图。文中给出了严格的理论推导和实验验证。
In this paper, a specially arranged moiré interference system and a Michelson interferometer system of a normal incident grating are taken together. The moiré interferometry system is used to measure the in-plane displacement components U and V, the perpendicular incident Michelson interference System measures out-of-plane displacement W The angle of incidence of incident light in the moire interference system is adjusted so that the propagation direction of the positive and negative first order waves deviates from the normal direction of the specimen grid by a small angle so that the spectrum point of the first order diffraction wave and the Michelson interference The spectral points of zero-order diffraction waves in the system are separated on the spectrum plane. The reflection of the small mirror changes the propagation direction of the first-order diffracted waves so that we can observe the fringe pattern of the 3D displacement field in real time in three separate imaging planes. The article gives a rigorous theoretical derivation and experimental verification.