一种新的投影莫阿三维轮廓测试系统

A New 3-D Measurement System Based on Projection Moiré

基于投影莫阿原理 ,考虑到传统投影莫阿测试系统结构难以达到均匀光照、机械结构相移速度慢且重复精度低的缺点 ,设计出一种新的投影莫阿三维轮廓投影成像测试系统。利用计算机实时控制亮灭三个光源实现相移 ,大大提高了系统测试速度 ,相移重复精度好。采用垂直投影 ,双电荷耦合器件 (CCD)倾斜成像机构 ,提高了光场的均匀性和可测物范围。该系统特点是测试速度快 (全场测量 :4s～ 8s)、相移精度高、测量面积大 (最大可为30 0mm× 30 0mm)、光强照明均匀 ,系统测量精度可达 40 μm。详细分析系统关键技术 ,并给出具体实验结果。结果表明系统的设计原理是成功的 ,为大面积物体三维轮廓快速测量提供了一种有意义的思路。

A new structure to 3 D measurement is developed based on projection Moiré. The method of changing lights is used instead of using mechanical structure for phase shift. It improves the speed greatly (The speed is 4 s～8 s). Two CCD are used to eliminate the reflection and the structure of vertical projecting and incline imaging are used to get the better light field. The system can measure big area (300 mm×300 mm). The precision of system is 40 μm. Experiment shows that the method is effective and satisfying.