偏转平台剪切电子散斑干涉相移技术研究

在沃拉斯顿棱镜作为剪切器件的传统剪切散斑干涉术中，由于错位的二物光束同光路传播，很难通过将它们分开来引入附加相位的方法实现相移。本文提出的偏转平台法是利用平台上物体的偏转来引入附加相位的，从而可以实现剪切电子散斑干涉的相移。理论分析证明，物体的偏转可以引入稳定、线性的附加相位，并给出了物体偏转角度与附加相位之间的关系式；利用周边固定、中心加载圆盘进行了典型实验，给出了实验结果，证明偏转平台相移技术能够有效地从干涉条纹中提取位移导数信息。

Study on Rotating Stage Phase-Shifting Technique in Electronic Speckle-Shearing Interferometry

Because two shearing object beams travel in the same direction when Wollaston prism is used as image-shearing device in traditional speckle shearing interferometry. It is difficult to realize phase-shifting technique by separating the two beams for introducing some additional phase changes between the two beams. Rotating stage phase-shifting method (RSPSM) presented in this paper could introduce additional phase changes by rotating the test object a small angle, which is fixed on a rotating stage. Theoretical analysis shows that RSPSM can introduce a stable and linear additional phase changes. The relationship between rotating angle and additional phase is offered. A typical experiment about RSPSM is carried out by using a centrally loaded clamped circular plate. The experimental results are offered. It shows that rotating stage phase-shifting technique could effectively obtain displacement derivative field from fringe patterns of test object.