摘要
为解决结构光三维测量系统中的光栅投影质量问题,提出并实现了以物理光栅为核心的结构光栅投影系统。该系统以现代光栅制造技术制造的精密光栅元件为核心,基于幻灯投影原理实现高质量的光栅条纹投影,利用步进电机带动高精密滚轴丝杆进行平移实现投影光栅的切换。实验结果表明,基于该系统实现的光学三维测量系统的可以达到1:100以上的对比度,具有较大的光强和良好的景深,同时能获得连续的强度分布及较好的正弦性,测量误差小于0.04mm,测量精度约为0.03mm,满足工业应用的要求。
A high precision grating projection system based on an exact grating element fabricated by modern grating manufacturing technique is proposed to improve the effect of fringe projection in optical 3-D measurement. The slide-based structure light projection is implemented by a high precision motion system, in which the grating is switched through high moving precision lead screw driven by a step motor. The system after accurate calibration of grating element satisfies the demand of 3-D optical shape measurement. Experimental results indicate that the system can achieve a contrast of more than 1：100 at a practically unlimited radiant flux and an outstanding depth of field, and also obtain a continuous optical intensity distribution. The measurement error of the scanning system is lower than 0.04mm, which can meet the demand of industrial application.
出处
《光电工程》
EI
CAS
CSCD
北大核心
2005年第10期66-69,共4页
Opto-Electronic Engineering
基金
国家自然科学基金(50375093)
上海市科技发展基金(025111054)
关键词
三维测量
光栅投影系统
格雷码
相移
Three-dimensional measurement
Fringe projection system
Gray-code
Phase shift
