基于单像素成像的微小位移测量方法  

Micro-metering method based on single-pixel imaging

作　　者：倪明阳 赵春宇 王宇[1] 邓华夏[1,2] 龚兴龙[1] NI Mingyang;ZHAO Chunyu;WANG Yu;DENG Huaxia;GONG Xinglong(CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,Anhui,China;School of Instrument Seicence and Opto-electronics Engineering,Hefei University of Technology,Hefei 230027,Anhui,China)

机构地区：[1]中国科学技术大学近代力学系中国科学院材料力学行为与设计重点实验室,安徽合肥230027 [2]合肥工业大学仪器科学与光电工程学院,安徽合肥230027

出　　处：《实验力学》2021年第2期167-174,共8页Journal of Experimental Mechanics

基　　金：国家自然科学基金(11972032)资助。

摘　　要：激光散斑位移测量法是一种重要的现代光学位移测量方法,由于受到图像传感器元件感光性能限制,难以在强干扰光条件下获得有效散斑场信息,进而无法获取位移场数据,因此,基于单像素成像技术,本文提出一种新的激光散斑位移测量方法:对散斑信息进行图案编码调制,并使用单像素探测器采集调制后的光强信息;利用Walsh-Hadamard Transformation(WHT)成像算法对散斑场图像进行重建;最后结合自相关算法确定物体的位移场信息。分别利用商业相机和单像素成像技术对散射介质的单轴微小位移进行测量,结果表明基于单像素成像技术的激光散斑位移测量技术可以获得较好的测量结果。相比于传统测量方法,基于单像素成像技术的激光散斑位移测量方法在复杂环境中具有一定的优势,可实现强光干扰下的位移场测量。As an important optical method on the displacement measurement,laser speckle displacement measurement method is restricted by the photosensitive performance of image sensor elements,especially under strong interference light conditions.Based on the single-pixel Imaging(SPI)technology,a new laser speckle displacement measurement strategy is proposed.With the speckle field information modulated by a sequential transform coding,a single-pixel detector is utilized to collect the modulated light total intensity.Then,a Walsh-Hadamard Transformation(WHT)algorithm is taken to reconstruct the speckle field image.Finally,the auto-correlation intensity algorithm is used to determine the displacement field of the target object.Using different methods to measure the uniaxial micro-displacement of the scattering medium,it is shown that the measurement way based on the single-pixel imaging approach can effectively obtain the displacement information.Compared with the traditional displacement measurement methods,the laser speckle displacement measurement method based on single-pixel imaging technology has the remarkable capacity to resist the strong light interference.Therefore,it can be used in the application of displacement measurement under extreme light environment.

关 键 词：单像素成像 激光散斑 微位移测量 

分 类 号：O348[理学—固体力学] TH744[理学—力学]