气液两相流三维测量中虚拟立体视觉标定技术研究

he calibration technique of the three-dimensional measurement system of gas-liquid two phase flow based on the virtual stereo vision is studied in depth.Firstly, based on single high-speed camera and two mirror groups, the virtual stereo vision system is constructed. The perspective transformation model of the high-speed camera and the model of the virtual stereo vision three-dimensional measurement are presented. Then, the camera and the virtual stereo vision sensor in the virtual stereo vision system are calibrated. Finally, the distribution of the bubble in the water is simulated by the target standard ball and its space distance is regard as the measurement standards, the impact of different calibration methods on the accuracy of three-dimensional reconstruction are compared. Experimental results indicate that the accuracy of the three-dimensional reconstruction is the best when the calibration reference is placed in the water tank and the left and right virtual camera and sensor are calibrated. The absolute error of the measurement distance is better than 0.13mm and the relative error is better than 0.49%. In the calibration of the gas-liquid two-phase flow three-dimensional measurement system based on the virtual stereo vision system, the impact of the light splitting path and tube wall refraction on calibration accuracy should be taken full account of.