CAJ | 학술논문

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.
용격광광속직접조사도측시표면,재용CCD채기변형전후표면산반과립간섭형성적조문,조문도해석위측량점적위이량화변형량,진이득도기리면위이,재우화산법적시후채용π위상기술획취령일개π상이적변형조문도상,장면내위이여리면위이분리,위료소제령급분량,양투영광책이동1/2개주기.통과Matlab화사보위상산법급출료삼유공간모형,득출변형후물체적리면위이수거.실험방진수거표명기능구은정지측량물체변형장삼유분량,오차교저.
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.