二维数字散斑相关技术测量中斜光轴拍摄的误差修正  

Error Correction of Optical Axis at an Angle Shooting in Two-Dimensional Digital Speckle Correlation Method

作　　者：梅潇[1] 解东平 乔榛[1] 

机构地区：[1]上海海事大学物流工程学院,上海201306

出　　处：《激光与光电子学进展》2015年第5期87-92,共6页Laser & Optoelectronics Progress

基　　金：第48批教育部留学回国人员科研启动基金项目

摘　　要：针对二维数字散斑斜光轴近距离测量时由于镜头光轴和待测目标面不垂直引起的误差问题,根据光学原理推导出不同角度拍摄时修正镜头畸变的校准应变公式。通过标准试件在弹性范围内进行拉压实验,验证校准应变公式对数字散斑图像测量数据修正的有效性,并与理论计算和应变片测试值进行比较。结果表明修正后的应变值误差在9.24%之内,提高了二维数字散斑相关测量技术的效率和精度。In order to solve the error problem caused by misalignment of the lens optical axis and the target surface for two-dimensional digital speckle inclined axis measurement at a close range. A simple and effective lens distortion correction formula based on optical principle under different angles is worked out to modify the testing strain and at last the data correction effectiveness of calibraton strain formula is verified by standard specimen under compressive and tensile tests. The results show that the proposed method can eliminate the effect of misalignment distortion whose error is not exceed 9.24% so that the efficiency and accuracy of two-dimensional digital speckle correlation technology are improved.

关 键 词：成像系统 数字散斑相关技术 镜头畸变 误差修正 应变 

分 类 号：O348[理学—固体力学]