基于激光散斑的非接触式三维形变测量技术研究  

Research of Non-Contact Three-Dimension Deformation Measurement Technology Based on Laser Speckles

作　　者：张建伟[1] 陈二阳[1] 章志远 钟子龙 秦悦 ZHANG Jianwei;CHEN Eryang;ZHANG Zhiyuan;ZHONG Zilong;QIN Yue(School of Electronic Information and Electrical Engineering,Chengdu University,Chengdu 610106,China)

机构地区：[1]成都大学电子信息与电气工程学院,四川成都610106

出　　处：《成都大学学报（自然科学版）》2023年第2期162-167,共6页Journal of Chengdu University（Natural Science Edition）

基　　金：四川省科技厅科技计划项目(2021YFG0202)。

摘　　要：传统接触式应变片测量需与被测物贴合实现测试,不仅操作复杂且测试效率较低.提出一种基于激光散斑的非接触式三维形变高精度测量技术.该技术由激光器将散斑图案投射到被测物体的表面,再通过高分辨率的双目相机对散斑图像进行距离测量,并完成形变位移数据的三维重建.其中,位移测量的关键技术采用线性回归拟合的亚像素匹配定位方法,且图像定位精度可达0.1像素.实验结果表明,采用激光散斑的非接触式三维形变高精度测量技术的精度在x、y方向可达0.02 mm、在z方向80%可达0.01 mm,极大简化了应力形变测量操作和提高了数据分析的效率.Traditional contacting measurement adopts strain gauges for gaining precise stress data,which is complicated and inefficient.A method of non-contact three-dimension deformation measurement technology based on laser speckles is proposed,which projects the laser speckles on the surface of the object,then the data of deformation is measured by high-resolution binocular stereo camera,and the three-dimension data is rebuilt with subpixel position method of 0.1-pixel level used in measurement by nonlinear regression fitting.The experiments show that the deformation measurement method not only has higher accuracy up to 0.02 mm at x,y and 0.01 mm at z of 80%,but also greatly improves the complication of measurement operation and the efficiency of data analysis.

关 键 词：三维测量 形变测量 双目立体视觉 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术] TN249[自动化与计算机技术—计算机科学与技术]