中国激光, 2009, 36 (s2): 184, 网络出版: 2009-12-30
双电荷耦合器件交会测量系统精度分析与结构参数优化
Structural Parameters Optimization and Accuracy Analysis for Intersection Measuring System with Double-Charge Coupled Device
测量 机器视觉 结构参数 精度分析 交会测量 电荷耦合器件 measurement machine vision structure parameters accuracy analysis intersection measurement charge coupled device
摘要
为了改善双电荷耦合器件(CCD)交会测量系统的精度,设计出符合实际指标要求的测量系统。基于透视成像原理建立了双CCD交会测量数学模型,通过分析系统中目标点的测量误差,研究了双CCD视觉传感器光轴倾角、基线距离和焦距长度等结构参数对系统空间坐标测量精度的影响。结果表明,当双CCD呈对称结构放置,光轴与基线夹角保持在30°-70°之间,选择具有较长焦距的透镜并且把待测物体置于测量系统中心位置时,可以获得毫米甚至微米量级的测量精度。基线距离对测量精度的影响较为复杂,一般控制在0.5-3倍测量距离之间为宜。研究结果对双CCD交会测量系统结构的优化设计具有一定的参考意义。
Abstract
In order to improve the measurement precision for intersection measuring system with double-charge coupled device (CCD),a mathematical model for measuring system is established according to geometrical imaging principle. Through analyzing the measure accuracy of the measuring point in the system,the effect of the visual sensor structural parameters such as the angles formed by optical axes of two cameras across a baseline,baseline length on the measurement result is investigated. The simulation results indicate that with a symmetrically-set and longer focal length doube-CCD measuring system,when the angles formed by the optical axes across a baseline are between 30° and 70° and the measuring point is located in the center of the system,the higher coordinate measuring accuracy can be obtained. The results is evaluated in designing double-CCD visual sensors.
胡峰, 胡春生, 王省书, 秦石乔. 双电荷耦合器件交会测量系统精度分析与结构参数优化[J]. 中国激光, 2009, 36(s2): 184. Hu Feng, Hu Chunsheng, Wang Xingshu, Qin Shiqiao. Structural Parameters Optimization and Accuracy Analysis for Intersection Measuring System with Double-Charge Coupled Device[J]. Chinese Journal of Lasers, 2009, 36(s2): 184.