System for the Digital Image Analysis of Spray Samples (Un Systeme D'AnalyseD'Image Pour L'Analyse D'Echantillons D'Arrosage)

摘要

In the course of our experiments on pesticide spraying, Kromekote cards were usedto collect spray samples at ground level. The spray liquid has a red dye in solution and the resulting samples represent images with two color states of red stains on a glossy white background (binary images). The analysis of these samples involves the measurement of the area and circumference of the stains from which data on the drop size and deposit density can be derived. Pesticide sprays are made of droplets of diameters ranging from less than 10 to about 500 micrometers. Droplets of a diameter less than 30 micrometers have a settling velocity an order of magnitude smaller than the usual vertical turbulent velocity in the atmospheric surface layer.