[en] Spray characteristics determine treatment performance and environmental contamination. Shadowgraphy associated with high-speed imaging presents an attractive option for measuring drop velocity and size simultaneously. This study presents an overview of the contrast problems occurring when using backlighted images and proposes appropriate solutions for reliable and quality measurements. Drop diameter measurement is based on the area inside the sub-pixel contour assuming a circular shape. Drop velocity is determined by tracking a drop on two successive images taking into account the drop size, speed limits and the general flow direction. Then, the drop size distribution is corrected taking in account the sampling rate of each drop. Finally, a comparison between PDA and shadowgraphy measurements realized simultaneously on the same spray location is presented.
Disciplines :
Agriculture & agronomy
Author, co-author :
De Cock, Nicolas ; Université de Liège - ULiège > Doct. sc. agro. & ingé. biol.
Massinon, Mathieu ; Université de Liège - ULiège > Sciences et technologie de l'environnement > Agriculture de précision
Lebeau, Frédéric ; Université de Liège - ULiège > Sciences et technologie de l'environnement > Agriculture de précision
Language :
English
Title :
Agricultural spray measurement by high-speed shadow imagery
Publication date :
10 January 2014
Number of pages :
8
Event name :
International Advances in Pesticide Application 2014