气液两相流三维测量中虚拟立体视觉传感器的优化设计与实验

针对高速动态的气液两相流动对象,基于双目体视原理,采用单台高速摄像机和反射镜组,对虚拟立体视觉传感器进行了优化设计;对气泡发生装置中竖直向上的气泡特征参数进行三维测量。建立虚拟立体视觉传感器三维测量模型,综合考虑实际视场、传感器结构和测量误差等因素,通过结构参数对3方面性能影响的仿真分析,最终确定传感器的结构参数。实验结果表明,传感器测量空间距离误差优于0.14 mm,相对误差优于0.49%,适于气液两相流动态测量,可以实现气泡运动的三维重建。

Optimum design and experiment of the virtual stereo vision sensor for the three-dimensional measurement in the gas-liquid two-phase flow

For the high-speed dynamic gas-liquid two-phase flow,and based on the measuring principle of binocular stereo vision,a novel virtual stereo vision sensor,which contains just a single high-speed camera and two reflector sets,is developed to measure three-dimensional feature parameters of upward bubbles in the bubble generating device.The three-dimensional measurement model of the virtual stereo vision sensor is established,and the structure parameters of the sensor are ultimately optimized by analyzing the simulation results of the structure parameters influence on the actual size of view field,the size of the sensor and the measurement error.The experimental results show that the measured spatial distance error of the sensor is lower than 0.14 mm and the relative error is lower than 0.49%.The virtual stereo vision sensor is suitable for the dynamic measurement of the gas-liquid two-phase flow,and can achieve the three-dimensional reconstruction of the motion trail for bubbles.