氢泡示踪流场图象的计算机实时采集和定量分析

Real-Time Sampling and Quantitative Analysis of Flow Patterns Traced by Hydrogen Bubble Lines with a PC Computer

本文介绍一个包括有氢泡流场显示仪、CCD面阵图象传感器、图象采集和帧存接口板以及IBM-PC微型计算机的实时图像处理系统.针对大型水利电力工程物模试验中低速非定常流动的测量,提出了用互相关算法分析图象奇偶场信息以及用延拓相关算法,分析氢泡时间线-脉线图象以提取流速矢量信息的方法.本系统已在灌河口航道物理模型上试用,有效地提高了测量精度和自动化程度.

A system consisting of a HB-Ⅱ hydrogen bubble flow visualizer, a CCD area image sensor and an IBM personal computer with frame grabber, is developed to solve the measurement of low speed and time dependent flow in large scale physical models of hydroelectrical engineering. Quantitative analysis are based on the cross correlation between images of odd and even fields of flow patterns. An extensional correlation procedure has also been developed to analyze the patterns of hydrogen bubble lines. As an example, the system is employed in the Guanheko channel physical model test, and results obtained indicate that the measurement accuracy is improved and the degree of automation is raised.