光学精密工程2025，Vol.33Issue(15)：2378-2389,12.DOI:10.37188/OPE.20253315.2378
激光三角二维速度与距离同步测量
Laser triangulation based two-dimensional velocity and distance simultaneous measurement
摘要
Abstract
The conventional laser-triangulation method is limited to axial distance measurement;its lateral resolution is influenced by surface microstructure,and measurement accuracy typically remains at the mi-crometer scale.These limitations restrict applications such as obtaining the absolute shape(diameter and microstructure)of rotating workpieces in machine tools from a single axial-distance measurement.The present study introduces a novel method for simultaneous measurement of orthogonal two-dimensional ve-locity and distance of moving objects.An edge-detection-based distance measurement approach that is ro-bust to speckle noise is also proposed to enhance applicability in high-precision industrial measurements.The method integrates the Scheimpflug principle with laser-triangulation sensors and establishes a theoreti-cal mapping model that relates object lateral motion,axial surface variations,and variations in the imaging spot characteristics.Algorithms are developed on the basis of geometric optics and speckle statistics.Digi-tal image correlation is employed to capture displacements of the speckle pattern's internal texture,while the Canny operator combined with a Zernike-based subpixel edge-detection algorithm is used to track light-spot edge dynamics in real time.These techniques enable concurrent measurement of lateral velocity and axial position of moving surfaces.Experimental results demonstrate relative errors and uncertainties on the order of 10-4.Lateral measurement resolution achieved via edge detection is improved by an order of mag-nitude,and axial measurement accuracy reaches the submicron level.The proposed methods extend the measurement capabilities of laser-triangulation sensors and provide technical support for investigations of multi-degree-of-freedom dynamic phenomena,including motion mechanics and fluid dynamics.关键词
激光三角测量/二维正交测量/散斑效应/数字图像相关/边缘检测Key words
laser triangulation/2D orthogonal measurement/speckle effect/digital image correlation/edge detection分类
信息技术与安全科学引用本文复制引用
王世纪,张浩,冯卫帅..激光三角二维速度与距离同步测量[J].光学精密工程,2025,33(15):2378-2389,12.基金项目
国家自然科学基金资助项目(No.52205555) （No.52205555）
辽宁省教育厅面上项目(No.JYTMS20230167) （No.JYTMS20230167）
