投影辅助的数字剪切散斑干涉扫描检测技术  

Projection aided digital shearography scanning detection technology

作　　者：李欣[1] 陈永 李伟仙[1] 李洋洋 郑磊 吴思进[1] Li Xin;Chen Yong;Li Weixian;Li Yangyang;Zheng Lei;Wu Sijin(School of Instrumentation Science and Opto-electronics Engineering,Beijing Information Science and Technology University,Beijing 100192,China;Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China;Daheng New Epoch Technology,Inc,Beijing 100080,China)

机构地区：[1]北京信息科技大学仪器科学与光电工程学院,北京100192 [2]北京空间机电研究所,北京100094 [3]大恒新纪元科技股份有限公司,北京100080

出　　处：《红外与激光工程》2021年第8期318-325,共8页Infrared and Laser Engineering

基　　金：国家自然科学基金(52075044,52075045)。

摘　　要：数字剪切散斑干涉技术已被广泛应用于复合材料无损检测,但常规检测面积有限,难以完成大尺寸复合材料的缺陷检测。提出了一种投影辅助数字剪切散斑干涉大尺寸复合材料扫描检测方法,该方法基于数字剪切散斑干涉技术并利用辅助投影引入额外表面特征,通过分视场间投影图的单应性矩阵计算分视场间实物图和散斑干涉图的全局匹配和坐标统一,完成了投影图-实物图-干涉图的多视场扫描与匹配拼接,同时在单视场检测引入4f光路及超广角镜头扩大单次检测面积。实验结果表明:此扫描检测系统能够实现缺陷位置、尺寸较精确的测量,位置定位均方根误差为7.0 mm,尺寸测量误差的均方根值为4.9 mm。在1.2 m的工作距离下单次检测面积可达600 mm×500 mm,全局扫描检测面积高达3.5 m×4.0 m。此方法具备抗刚体位移干扰强,缺陷检测灵敏度高的优点,适合大尺寸高性能复合材料无损检测现场使用。Digital shearography has been widely used in non-destructive testing of composite materials. But the conventional detection area is limited and the defect detection of large-size composite materials is difficult to achieve. A digital shearography assisted with projection scanning detection for large-size composite materials was introduced. Based on digital shearography and the auxiliary projection which could project additional surface features, global matching and coordinate unification of the sub-view original images and the speckle interferograms were calculated by the homography matrix of the corresponding projection images to realize the multi-field scanning and matching stitching of projection, origin, and interferogram images. At the same time, a 4 f optical path and an ultra-wide-angle lens were imported for the one detection to expand the detection area.Experimental results show that the scanning detection system can achieve more accurate measurement of the defect position and size. The root mean square error of location positioning is 7.0 mm, and the root mean square value of dimension measurement error is 4.9 mm. At a working distance of 1.2 m, the single detection area can reach 600 mm×500 mm and the global scanning detection area can reach 3.5 m×4.0 m. This method has the advantages of strong resistance to rigid body displacement interference and high sensitivity of defect detection,which is suitable for non-destructive testing of large-size and high performance composite materials.

关 键 词：数字剪切散斑干涉 大尺寸 投影辅助 无损检测 复合材料 

分 类 号：TH741[机械工程—光学工程]