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Spray Droplet Characterization from a Single Nozzle by High Speed Image Analysis Using an In-Focus Droplet Criterion.

Sofija Vulgarakis Minov1,2,3, Frédéric Cointault4, Jürgen Vangeyte5

  • 1The Institute for Agricultural and Fisheries Research (ILVO), Technology and Food Science Unit, Agricultural Engineering. Burgemeester Van Gansberghelaan 115, bus 1, Merelbeke 9820, Belgium. sofija.vulgarakis@gmail.com.

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Summary

This study introduces a new technique for measuring pesticide spray droplet size and velocity using high-speed imaging. The method accurately characterizes agricultural spray applications, aiding in better pesticide delivery.

Keywords:
high speed image analysispiezoelectric droplet generatorspray characterizationin-focus criterion

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Area of Science:

  • Agricultural Engineering
  • Fluid Dynamics
  • Optical Measurement Techniques

Background:

  • Accurate pesticide spray characterization is crucial for optimizing agricultural application processes.
  • Understanding droplet size and velocity impacts spray deposition and efficacy.
  • Existing methods may have limitations in non-intrusive, real-time measurement.

Purpose of the Study:

  • To demonstrate the proof of principle for a novel droplet size and velocity measurement technique.
  • To validate the technique for various hydraulic spray nozzles.
  • To develop a non-intrusive method for characterizing agricultural sprays.

Main Methods:

  • Utilized a high-speed backlight image acquisition and analysis system.
  • Developed an in-focus criterion based on gray level gradient for droplet analysis.
  • Conducted experiments with a piezoelectric generator and a real sprayer setup.
  • Validated results against a Phase Doppler Particle Analyzer (PDPA).

Main Results:

  • Successfully measured droplet sizes ranging from 24 μm to 543 μm.
  • Quantified droplet velocities between approximately 0.5 m/s and 12 m/s.
  • Demonstrated reliable, non-intrusive measurement of spray characteristics.
  • Showed strong correlation between the new method and PDPA results.

Conclusions:

  • The developed high-speed imaging technique provides accurate droplet size and velocity measurements.
  • This non-intrusive method offers a viable alternative for agricultural spray characterization.
  • The findings contribute to improved understanding and optimization of pesticide application.