SENSOR FOR MEASURING LOW VOLUME SPRAY DEPOSIT

SUMMARY: A spray deposit sensor, circuit and data acquisition system was developed. The sensor provides a voltage output proportional to the number of spray drops deposited on the sensor. Spray deposits ranging from 1 to 10 ul were measured. The ability to accurately measure deposit volume was evaluated for various nozzles over a range of pressures. Constant line spacing sensors and variable line spacing sensors were used to determine spray volumes and droplet size ranges. The sensors and data acquisition system provided quick, accurate results of spray deposits under 10 uI.