计算机模拟CCD高速线材测量

Simulation of On-line Measurement of Rod with Computer

本文对CCD 在线测量的原理进行了简述。针对其中存在的问题,提出了用计算机软件进行模拟的方法,预测系统的测量误差。内容包括:①被测线材的跳动模拟;②CCD 成象的模拟;③CCD 信号输出及处理的模拟。模拟的过程中考虑了光学衍射、运动模糊,信号传输损失、信噪比等多种因素,使得模拟结果比较接近实际情况。文章还讨论了在应用该软件的基础上,针对某一线材直径在不同跳动量下的测量值,得出了不同跳动量下的阈值分布。分析后认为:单阈值无法解决跳动模糊的问题,进而提出了双阈值方法,并得到了一些结果。

The principle of measurement of rod by CCD linear array cam-era was described.According to the problems appearing in measurement,a so-ftware for computer simulation was provided to predict the errors of measure-ment.The simulation includes:1)Vibration of the rod2)Taking picture with CCD camera3)Signal outputing and processingThe optical diffraction,blurring by motion,loss of electrons during transf-orm inside CCD camera,ratio of signal to noise ect.were also considered.So theresults of simulation correspondingly approached the fact.The software developed can be used for determining the diameters of rod un-der various vibration.Analysising the distribution of thresholds we have foundthat under singlethreshold it could not satisfy to solve the problems of blurby vibration of rod.So that the dual-threshold was provided and some resultshave been obtained.The posibility for further improvement of such computer simulation was di-scussed.