基于单步相移投影技术的三维物体曲面光学检测

OPTICAL MEASUREMENT OF 3-D SURFACE CONTOURING WITH GRATING PROJECTION BASED ON ONE-STEP PHASE SHIFT

利用规则栅线投影到物体表面的变形光栅 ,采用单步相移算法解调出含有物体表面高度信息的位相 ,建立了一种较传统相移技术快速、但精度相当的投影技术 ,该技术只需采集一幅图象。

An optical technique for the measurement of 3 D shape has been set up, which is based on a deformed projected grating pattern that carries the 3 D information of the measured object. The phase map of a measured object can be obtained automatically and accurately by using one step phase shift algorithm. In contrast to traditional phase shift technique, the technique is much faster and its accuracy is equivalent. And only one image pattern is sufficient for measuring. Theoretical analysis and experimental result of a typical object are given.