基于灰度差异与自相关的粒子速度测量新方法

New method for measuring particle velocity based on gray scale difference and autocorrelation

基于曝光时间差异对应不同的粒子像点灰度的原理,提出了一种基于灰度差异与自相关的粒子速度测量方法。介绍了实现测量的流程和图像处理软件的算法。通过数值模拟和测量实验,验证了所提出的图像处理过程及算法的可行性,可实现流场中多数示踪粒子各自对应速度量的测量。

A new method for measuring the particle velocity based on the gray scale difference and the autocorrelation was proposed from the fact that different exposure time corresponds to different gray scale of particle image point. The flow chart of measuring process and the software algorithm for the image processing were introduced. The numerical simulation and measuring experiment were done and the feasibility Of the image processing and its algorithm were validated, showing possibility of simultaneously measuring the velocities of many tracer particles in a flow field.