针对移动大尺寸工件的表面形貌特点,利用二维激光三角法构造出水平和垂直虚拟测量基准面;结合多传感器融合准则,建立了一种新型的大尺寸工件测量模型,并利用该模型实现了移动工件两端端面到虚拟测量基准面的位移非接触测量.采用误差分离方法自修正理论误差和运动误差的影响;结合人机交互界面,研制了高精度、低成本的移动大尺寸工件长度自动检测系统.利用该系统对在(1 000±25) mm内以不同速度运动的圆柱体大尺寸工件长度进行检测,得到的检测分辨力为10 μm、检测精度为100 μm、工件移动速度为5 cm/s.实际运行结果表明,该系统安全、稳定、快速,可满足工业在线生产中对同类型规则的大尺寸工件控制和检测的要求.%According to an actual engineering project and dynamic topographic features of moving workpieces, a new measuring model for large scale workpieces was established based on the virtual measurement datum structured by the two-dimensional laser triangle measuring method and the multi-sensor fusion rule. Then, a noncontact, high precision and low cost dynamic length measuring system based on the human-computer interaction was developed by using the error separation method to correct theoretical errors and motion errors. In the experiment, the two probe units were placed on the two sides of moving workpiece, the displacement between both end planes of workpiece and virtual measurement datum was measured simultaneously. Finally, A experimental measurement on the cylinder workpieces (1 000 + 25) mm at different speeds was performed, and results show that the system can offer the resolution less than 10 pm, measuring precision over 100 j^m, and a maximum speed of 5 cm/s. According to the actual operation results, the proposed measurement techniques and measuring system can be well applied to the length detection for similar regular large scale workpieces in industrial production.
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