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Development of an imaging system for single droplet characterization using a droplet generator
S Vulgarakis Minov1, F Cointault, J Vangeyte
1Institute for Agricultural and Fisheries Research (ILVO), Technology and Food Science Unit, Agricultural Engineering. B.V. Gansberghelaan 115, bus 1, BE-9820 Merelbeke, Belgium. sofija.minov@ilvo.vlaanderen.be
Communications in Agricultural and Applied Biological Sciences
|July 27, 2013
Summary
High-speed imaging optimizes agricultural spray characterization. This study details optimal setups for measuring individual pesticide droplet size, velocity, and macro-spray features for improved application accuracy.
Area of Science:
- Agricultural Engineering
- Fluid Dynamics
- Optical Measurement
Background:
- Accurate pesticide application relies on understanding spray droplet characteristics.
- Traditional non-imaging methods have limitations in pesticide spray analysis.
- Advancements in digital imaging drive interest in high-speed imaging for spray characterization.
Purpose of the Study:
- To develop and validate a high-speed imaging technique for characterizing single agricultural spray droplets.
- To determine optimal imaging parameters for measuring droplet size and velocity.
- To establish methods for analyzing macro-spray characteristics like trajectory and shape.
Main Methods:
- Utilized a piezoelectric single droplet generator and high-speed imaging.
- Systematically tested various camera settings, lenses, diffusers, and light sources.
- Employed image analysis to refine setup for droplet size, velocity, trajectory, and spray shape measurement.
Main Results:
- Identified an optimal setup for micro-droplet analysis: high-speed camera (6 µs exposure), microscope lens (43 cm WD, 1.0x0.8 cm FOV), and Xenon backlight.
- Determined an optimal setup for macro-spray analysis: high-speed camera, Macro Video Zoom lens (14.3 cm WD, 7.5x9.5 cm FOV), and diffused halogen spotlight.
- Demonstrated the critical role of image acquisition and processing systems in accurate spray characterization.
Conclusions:
- High-speed imaging provides a robust method for detailed agricultural spray analysis.
- Specific optical configurations are necessary for accurate micro-droplet and macro-spray measurements.
- Optimized imaging techniques enhance the precision and efficiency of plant protection product application.
