采用对数极坐标变换的散斑相关角位移测量法  

Speckle Correlation Method for Angular Displacement Measurement by Using Log-Polar Transformation

作　　者：马凯[1] 于之靖 王志军 吴军[1] Ma Kai1, Yu Zhijing2, Wang Zhijun2, Wu Jun1(1. College of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300 China;2 College of Electronic Information and Automation, Civil Aviation University of China, Tianjin ; 300300,China)

机构地区：[1]中国民航大学航空工程学院,天津300300 [2]中国民航大学电子信息与自动化学院,天津300300

出　　处：《激光与光电子学进展》2018年第3期301-307,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(U1533111);中央高校基本科研业务费项目中国民航大学专项资助(31220170033;Y17-08)

摘　　要：将传统散斑相关法应用于结构试件变形测量中存在一定的角位移范围限制,针对这一问题,提出了一种采用对数极坐标变换的散斑相关角位移测量法。首先,该方法采用对数极坐标变换,将结构试件散斑图像在直角坐标系下的角位移转换为对数极坐标下的平移;然后,利用散斑相关法结合九点二次曲面拟合法实现散斑图像的角位移测量;最后,通过模拟实验与实物实验验证了方法的有效性。实验结果表明,在[0°,90°]的角位移变化范围内,本方法角位移测量的均值误差控制在0.06°内,标准差控制在0.02°内,有效提高了现有散斑相关法的角位移测量范围与测量精度。The traditional speckle correlation method has a range limit in the angular displacement measurement of structural members. Aiming at this problem, a speckle correlation method for the angular displacement measurement by using log-polar transformation is presented. Firstly, the log-polar coordinate transformation method is used to convert the angular displacement measurement of the speckle image in the cartesian coordinate system to the displacement measurement under the log-polar coordinates. Secondly, the angular displacement measurement of speckle image is realized by using speckle correlation method and nine-point quadratic surface fitting method. Finally, the effectiveness of the method is verified by simulation experiment and physical experiment. The experimental results show that the mean error of the angular displacement measurement is controlled within 0.06° and the standard deviation is within 0.02° with the angular displacement range of [-0°, 90°] This method effectively improves the range and accuracy of the angle displacement measurement of existing speckle correlation method.

关 键 词：测量 散斑相关法 角位移测量 对数极坐标变换 九点二次曲面拟合 

分 类 号：TN29[电子电信—物理电子学] TB922[一般工业技术—计量学]