中国激光, 2019, 46 (7): 0704003, 网络出版: 2019-07-11
基于相移与调制度比的结构光三维面形垂直测量方法 下载: 1729次
Vertical Measurement Method for Structured Light Three-Dimensional Profilometry Based on Phase-Shifting and Modulation Ratio
测量 三维面形测量 调制度测量轮廓术 垂直测量 高度映射 相移算法 measurement three-dimensional shape measurement modulation measuring profilometry vertical measurement height mapping phase shifting algorithm
摘要
为了兼顾调制度测量轮廓术的测量速度与测量精度,提出了一种新的基于相移与调制度比的调制度测量轮廓术方法。使用一个由柱面镜和普通投影镜头组成的特殊投影系统,将竖直与水平两组相移正弦光栅依次投射在测量区域,柱面镜使两种光栅条纹的“像面”分离,两“像面”之间构成测量区域。利用相移算法得到两组正弦条纹在测量区域的调制度分布,并建立两种条纹的调制度比与实际物理位置的映射关系。测量时,将待测物体放置于测量区域,并根据物体表面两种条纹的调制度比与物理位置的映射关系,即可重建物体的三维面形。通过对实物的测量实验验证了所提方法的可行性。
Abstract
In this paper, a new modulation measuring profilometry method based on phase-shifting and modulation ratio is proposed in order to balance the measurement speed and accuracy of the traditional methods. In the proposed method, a special projection system comprising a common projection lens and a cylindrical lens is used. Two groups of vertical and horizontal phase shifting sinusoidal grating fringes are projected onto the measurement area. The “image planes” of the two types of fringes are separated by the cylindrical lens, and the measurement area is between the two “image planes.” The modulation distributions of the two types of sinusoidal grating fringes are obtained using a phase shifting algorithm, and the mapping relationship between the modulation ratio of the fringes and the actual position is established. The three-dimensional shape of the object can be reconstructed according to the mapping relationship between modulation ratio of the fringes and the actual position. In addition, the experiments are conducted to evaluate the feasibility of the proposed method.
卢明腾, 苏显渝. 基于相移与调制度比的结构光三维面形垂直测量方法[J]. 中国激光, 2019, 46(7): 0704003. Mingteng Lu, Xianyu Su. Vertical Measurement Method for Structured Light Three-Dimensional Profilometry Based on Phase-Shifting and Modulation Ratio[J]. Chinese Journal of Lasers, 2019, 46(7): 0704003.