将涡旋光应用于电子散斑干涉, 测量变形物体的离面位移.把传统的电子散斑干涉测量技术与液晶空间光调制器相结合, 将所获得的涡旋光作为参考光或者物光进行变形测量.推导出物光为平面光、参考光为涡旋光, 和参考光、物光均为涡旋光时物体变形后的干涉强度公式, 模拟计算了变形后的干涉图样, 分析了变形图样的特征.运用四步相移方法得到了物体的变形相位公式, 通过解包裹得到了物体的变形相位.模拟计算得到的三维相位分布图与物体离面位移的变形相位理论值的三维分布图相吻合.模拟实验结果表明, 涡旋光可以应用于物体的变形测量, 为变形测量提供新的途径.

Out-of-plane displacement of deformation object can be measured by application of vortex beams in electronic speckle pattern interferometry. The deformation measurement was based on the combination of traditional electronic speckle interferometry techniques and liquid crystal spatial light modulators. The vortex beams which were generated by liquid crystal spatial light modulator can be used as reference light or object light. When the vortex beam as reference light and plane beam as object light, or the interference intensity was calculated, and the interference fringe patterns were simulated before and after the tested object deformed. The deformed interference fringe patterns were analyzed and the corresponding phase-maps were calculated though phase shifting method. The three-dimensional phase distribution of simulation is coincident with the theoretical value of out-of-plane displacement. The results show that the vortex beam can be used in out-of-plane displacement measurement, which provides a new method in deformation measurement.