基于优化电子散斑光谱的三维物体测量研究

用激光光束直接照射到测试表面,再用CCD采其变形前后表面散斑颗粒干涉形成的条纹,条纹图解析为测量点的位移量和变形量,进而得到其离面位移,在优化算法的时候采用π位相技术获取另一个π相移的变形条纹图像,将面内位移与离面位移分离,为了消除零级分量,让投影光栅移动1/2个周期.通过Matlab和四步位相算法给出了三维空间模型,得出变形后物体的离面位移数据.实验仿真数据表明其能够稳定地测量物体变形场三维分量,误差较低.

Three-dimensional body measurement based on optimized electron speckle spectrum

With laser beam directly radiated to the test surface, a CCD was used to pick up the fringes before and after its deformation due to speckle interference. These fringes were translated into the displacement and deformation components and its off surface displacement was obtained. In the optimized algorithm, π phase shift technology was adopted to obtain the fringe image of another π shift, which separated surface displacement with off surface displacement, the zero order component was removed and projection grating was move by a half period. A three-dimension space model was established through Matlab and four step phase algorithm. The experiment data indicated this solution could measure the three dimension deformation of the object accurately.