剪切电子散斑平移棱镜相移方法研究

在剪切电子散斑干涉中,由于错位的二物光束同向传播,很难将二物光分开引入附加相位的方法来实现相移.平移棱镜相移法可以在二束物光不分开的情况下实现相移.本文对平移棱镜相移法进行了理论分析,证明平移棱镜可以引入稳定、线性的附加相位,给出了附加位移与附加相位之间的关系式.利用周边固定、中心加载的圆盘进行实验,给出了实验结果,证明平移棱镜相移法可以有效地从干涉条纹中定量提取位移导数信息.

Phase-shifting Method of Translating Wollaston Prism in Electronic Speckle-shearing Interferometry

In electronic speckle-shearing interferometry,it is difficult to realize phase-shifting by separating two birefracting beams.The phase-shifting method of the translating Wollaston prism can introduce additional phase changes without separating the two beams.The principle of the phase changes introduced by translating Wollaston prism was discussed.The relationship between the magnitude of translation and the additional phase was offered.A typical experiment about the method presented was completed by using a centrally loaded clamped circular plate.The obtained results show that the translating Wollaston prism method of phase-shift can effectively obtain displacement derivative field from fringe patterns of a test object.