A Data Acquisition and 2-D Flow Measuring Technology in Agricultural Spray Field Based on High Speed Image Processing

In order to solve the faults in usual measurements of droplet distribution and motion in agricultural spraying field, a new method is given for the analysis of droplets characteristics and motion with PDIA (particle / droplet image analysis) and digital image processing technique. During the analysis of the size of droplet and the velocity, images of droplets in spray field has been captured by using high-speed imager. The parameter of droplet such as size, perimeter, equivalent diameter, Shape factor and position etc, have been calculated with digital image processing technology. The trace of droplet in different frames has been tracked with the method, which is based on flag tracking and droplet neighborhood matching probability technique. The results showed this measurement can both realize the motion trace of droplet in different image frames and analyses the velocity of droplet. This measuring technique can detect the droplet parameters quickly and accurately for agricultural sprays, and provide the basic way for research on 2-D flow visualisation image analysis in pesticide application.