提出一种利用投影仪条纹投影技术完成三维坐标测量的方法。测量系统包括两部分:一是可以在三维坐标内自由移动的测头,另一个就是静止不动的面阵探测阵列。移动的测头上有微型投影仪,形成的投影条纹由面阵探测器接收。应用相移算法精确测量探测器上的相位,并结合几何系统模型通过最优化方法确定测头的xyz坐标。给出了测量原理、迭代求解方法、计算机模拟和初步实验结果。实验中,微型投影装置投影相移条纹由面阵探测器接收,利用相移条纹计算出的相位分布具有很高的精度和较强的抗噪声能力,为后续的迭代优化计算提供了基础。实验结果表明,该测量方法具有较高的测量精度。

We present a coordinate measuring method that has been specially devised to perform measurement of coordinates by projected fringe techniques of projectors in three dimensions. It is composed of two parts:one is a target that moves in three dimensions,and the other is a stationary two-dimensional array of photodetectors. The mini-projector is tied to the target,whose projected fringe is monitored by the photodetectors. Application of a phase-shifting technique allows the phase values of the photodetectors to be precisely measured,which are then fitted to a geometric model of multilateration so as to determine the xyz location of the target by a method of optimization. The measuring principle,iterative method,computer simulation and preliminary results are given. The phase-shifting technique has high accuracy,and strong resistance to noise. Iterative optimization for follow-up provides the basis for the calculation. The experimental results prove that the proposed coordinate measuring method can measure the xyz coordinates of the target with high precision.