相位锁定循环投影技术及其应用

由一组规则栅线投影到物体表面的变形光栅,采用相位锁定循环解调算法解调出含有物体表面高度信息的相位.该技术的最大优势是不需传统的相位去包裹.利用该算法对二维栅线图扫描确定的相位.本文给出了一个典型试件的实验结果和分析.

PHASE LOCKED LOOP PROFILOMETRY WITH GRATING PROJECTION AND ITS APPLICATION

An innovate technique for obtaining automatic three dimensional shape information of a diffuse surface is presented.The technique is based on a new approach of phase measuring from deformed projected grating which carries the 3 D information of object,Demodulation is carried out by determining the phase of these deformed projected grating using a novel digital phase locked loop demodulation algorithm.The technique has the main advantage that the traditional phase unwrapping process is not required.The phase is determined continuousely as the algorithm scans the two dimensional fringe pattern.Theoretical analysis and experimental result of typed object are presented.