针对单镜头激光三角法存在的光条遮挡问题,提出了一种解决光条遮挡问题的双镜头激光面型测量方法。首先通过实验观察并探究了光条在传感器中的分布现象及形成原因,分析了物体表面形貌、光学系统与光条分布的关系,以及光条分布对三维重建的影响;然后基于直入射激光三角法原理设计了双镜头测量系统,应用形态学处理结合灰度重心法等多种算法提取光条中心坐标,最后基于方差最小化对双镜头数据进行关联融合。实验结果表明:双镜头能够解决由光条遮挡造成的大面积形貌缺失的问题,能够重建待测物体表面形貌的完整包络,数据缺失占比小于0.5%。

Herein, a dual-lens laser profile measurement method was proposed to solve the problem of light stripe occlusion in the single-lens laser triangulation method. First, we experimentally observed and explored the distribution of light stripe in the sensor and its reasons for the formation. Moreover, we analyzed the surface morphology of the object, the relation between the optical system and light stripe distribution, and the light stripe distribution effect on three-dimensional reconstruction. Then, based on the direct incidence laser triangulation principle, a dual-lens measuring system was designed. Morphological processing combined with a gray-scale centroid method and other algorithms was used to extract the center coordinates of the light stripe. Finally, the dual-lens data were fused based on the minimization of variance. Experimental results show that the proposed dual-lens can solve the problem of large-area morphology loss caused by light stripe occlusion and reconstruct the complete envelope of the object''s surface morphology. Furthermore, the associated data loss ratio was less than 0.5%.