设计了由平行光源、双远心镜头、面阵CCD摄像机和待测物等部分组成的高精度线材测径仿真系统。考虑到实验系统是 为了模拟完成高速线材的拍摄测量,在线材轧制过程中其径向速度可以高达100 m/s,同时存在横向跳动的迹象, 所以在光学设计中采用具有固定放大倍率的远心镜头,确保当物距改变时光敏面上的图像大小不发生变化; 并且选用的面阵CCD最快曝光时间可以达到1 μs,从而可以得到实时反映被测物体尺寸的高清图像。 实验结果表明:使用该仿真系统测量出的工件直径精度可以达到20 μm,足以满足生产需要。

A high precision wire diameter measurement simulation system is designed, which is composed of parallel light source, double telecentric lens, CCD camera and object to be tested. Considering that this experimental system is designed to simulate the photography and measurement of high-speed wire, the radial velocity of wire rod can be as high as 100 m/s in the rolling process, and there are signs of transverse runout. Therefore, in the optical design, a telecentric lens with a fixed magnification rate is used to keep the image size on photosensitive surface unchanged when the distance is changed. Moreover, the maximum exposure time of the selected plane array CCD can reach 1μs, thus a high-definition image reflecting the size of the measured object can be obtained in real-time. The experimental results show that the diameter accuracy of the workpiece measured by the simulation system can reach 20 μm, which can meet the needs of production.