光学三角法全视场自扫描测头的设计与研究

Design and Research on Optical Triangulation Scanner with Full Field of View Scanning Ability

本文基于光学三角法测量原理 ,设计了一种通过改变光平面与成像光轴夹角来实现对视场内被测零件表面扫描的视觉测头。通过紧凑的旋转镜片反射机构驱动光平面在物空间做扫描运动 ,将全视场自扫描功能封装在线结构光视觉测头内部 ,使扫描成为线结构光视觉测头的一项内置功能。光平面定位精度实验以及尺寸测量的重复性精度实验均表明这种设计方案的可行性。这种自扫描测头对中、小尺寸零件三维尺寸的快速检测有重大的实用价值。

A novel noncontact scanner that scans the inspected part's surfaces by changing the angle between laser plane and optical axis is designed based on optical triangulation. The laser plane sweeps the measurement space through a compact rotational reflection mirror mechanism,which is encapsulated inside the scanner. In this way the full field of view scanning ability is made to be a built- in function of the line- structured vision scanner.The experimentresults of the laser plane's location accuracy and dimensional measurementrepeatabil- ity proved the scheme's applicability. The full field of view scanner is expected to be applied in the field of rapid inspection and profile measurement of middle- size and small- size parts.