光涡旋阵列位移测量模拟

DISPLACEMENT MEASUREMENT SIMULATION OF OPTICAL VORTX LATTICE

将光学涡旋点阵与电子散斑干涉技术相结合,提出了一种基于涡旋光干涉特性测量物体离面位移的新方法.利用三束光干涉产生光涡旋点阵作为物光,模拟了物体变形前后与平面波干涉的图样.推导得出光流场运动矢量场与干涉图样条纹频率、变形相位场之间的关系.模拟计算得到的三维位移相位场与理论值相吻合.模拟结果表明,光学涡旋点阵用于物体变形的测量,提高了测量灵敏度,为相位测量提供了新方法.

A new method based on optical vortex interferometry is proposed to measure the out-of-plane displacement of an object by combining the optical vortex lattice with the electronic speckle pattern interferometry （ESPI）.The optical vortex lattice is used as the object light by the interference of the three light beams to simulate the interference of the plane wave before and after deformation.The relationship between the optical flow velocity field and the fringe frequency and deformation phase field of the interference pattern is deduced.The calculated three-dimensional displacement phase field agrees well with thc theoretical value.The simulation results show that the optical vortex lattice can be used to measure the deformation of the object,which improves the measurement sensitivity and provides a new method for phase measurement.