Analysis of Nigrosin and BSF Spot Sprays with PDPA drop size measurements

摘要

Utilisation of plant protection products (PPP) in precision agriculture depends on sensing and application methods with a high spatial resolution. Nozzles are the common utensils for applying PPP but have the disadvantage that they are not switchablewithout affecting the spray pattern quality. Pulse Width Modulated (PWM) nozzles are a solution for switch ability without affecting the spray quality too much.The aim of this research is to determine the spray distribution in the spot spray for a 20% and 50% flow rate PWM-setting for 2 and 3 bar liquid pressure. In three different experiments the spot spray is analysed. 1) Experiments with Nigrosin on a spray track. 2) Experiments with a fluorescent dye on a spray track and 3) Drop size measurements with a Phase Doppler Particle Analyser (PDPA). In the spray track the nozzle was moved at actual driving speeds. The PDPA measurements were done at a stationary nozzle.