期刊
SENSORS
卷 16, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/s16020218
关键词
in-focus criterion; piezoelectric droplet generator; high speed image analysis; spray characterization
资金
- Institute for Agricultural and Fisheries Research (ILVO, Merelbeke, Belgium)
- Regional Council of the Burgundy Region (Dijon, France)
- Nicephore Cite Company (Chalon sur Saone, France)
Accurate spray characterization helps to better understand the pesticide spray application process. The goal of this research was to present the proof of principle of a droplet size and velocity measuring technique for different types of hydraulic spray nozzles using a high speed backlight image acquisition and analysis system. As only part of the drops of an agricultural spray can be in focus at any given moment, an in-focus criterion based on the gray level gradient was proposed to decide whether a given droplet is in focus or not. In a first experiment, differently sized droplets were generated with a piezoelectric generator and studied to establish the relationship between size and in-focus characteristics. In a second experiment, it was demonstrated that droplet sizes and velocities from a real sprayer could be measured reliably in a non-intrusive way using the newly developed image acquisition set-up and image processing. Measured droplet sizes ranged from 24 mu m to 543 mu m, depending on the nozzle type and size. Droplet velocities ranged from around 0.5 m/s to 12 m/s. The droplet size and velocity results were compared and related well with the results obtained with a Phase Doppler Particle Analyzer (PDPA).
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