面内微位移测量的散斑相位涡旋相关方法研究  

Micro in-plane displacement measurement using digital speckle correlation method based on phase vortices

作　　者：吕芳捷 金伟华[2] 李新忠[1] 李慧娟[1] 台玉萍[3] 聂兆刚[4] 张利平[1] 

机构地区：[1]河南科技大学物理工程学院,河南洛阳471023 [2]国家知识产权局专利局审查协作北京中心光电部,北京100085 [3]河南科技大学化工与制药学院,河南洛阳471023 [4]新加坡南洋理工大学数学物理学院,新加坡637371

出　　处：《光电子．激光》2013年第11期2180-2185,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61205086)资助项目

摘　　要：提出了用散斑相位涡旋相关方法测量面内微位移。首先利用拉盖尔-高斯变换,将光强灰度图的实值信号I(x,y)变为复光强信号珘I(x,y),获得涡旋分布矩阵;然后,以涡旋核结构参数的偏心率e作为特征因子进行相关运算;最终实现面内微位移的测量。在相同计算机配置下,对毛玻璃的面内位移进行了测量,结果显示,散斑相位涡旋相关法的平均计算时间为35.4ms,传统数字散斑相关法(DSCM)的平均计算时间为376.7ms,而两者的相对误差均小于5%,这与数值模拟结果相符。实验结果与数值模拟结果表明,散斑相位涡旋相关方法可准确测量面内微位移,与传统DSCM相比,在保持相同测量精度的前提下,计算效率至少提高了1个数量级。Micro in-plane displacement measureme nt using digital speckle correlation method （DSCM） based on phase vortices is proposed in this paper.First we get a matrix o f vortices distribution through Laguerre-Gauss transform,which turns real-valued signals I （x,y） of the intensity gray image into complex intensity signals （x,y）.T hen we take eccentricity of the core structure parameter as characteristic factor to make correlation operation.Finally,the mic ro in-plane displacement can be measured.Under the same computer configuration,the in-plane displacement of the roughness glass was measured.The average calculating time o f this proposed method was 35.4ms,however,the average calculating time of the t raditional DSCM was up to 376.7ms.Experimental results are well agreed with the numerical simulation results.Results show that the speckle phase vortices correlation method can exactly measure micro in-plane displacement.Compared wi th the traditional DSCM,the calculation time increases at least one order of magnitude in keeping equivalent measuring accuracy.

关 键 词：微位移 数字散斑相关(DSCM) 相位涡旋相关 

分 类 号：O439[机械工程—光学工程]