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Measurement of single droplet characteristics using high speed imaging techniques

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Abstract
The spray droplets generated by agricultural nozzles play an important role in the application accuracy and efficiency of plant protection products. But, the process of generating and controlling small droplets of high uniformity, constant size and form is complex and difficult to quantify or model. The limitations of the non-imaging techniques and the recent improvements in digital image acquisition and processing increased the interest in using high speed imaging techniques in pesticide spray characterisation. The goal of this study was to apply an imaging technique to evaluate the characteristics of a single spray droplet using a piezoelectric single droplet generator in a droplet-on-demand mode with 4 glass nozzles and a high speed imaging technique. Tests were done with a high-speed camera, microscope lenses, and a xenon light source. Image analysis algorithms were developed for droplet sizing and tracking on images gained from this acquisition system. The experiments have shown that using the selected image acquisition and processing system, different droplet sizes and velocities can be measured. By changing the pulse width and the nozzle orifice size, repeatable droplets could be generated with a size ranging from 135 μm up to 461 μm. The ratio between droplet diameter and nozzles orifice opening varied from 1.33 up to 3.42 depending on the settings.
Keywords
Droplet characteristics, droplet generator, high speed imaging techniques, image processing

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Chicago
Vulgarakis Minov, Sofija, Frédéric Cointault, Jürgen Vangeyte, Jan Pieters, and David Nuyttens. 2013. “Measurement of Single Droplet Characteristics Using High Speed Imaging Techniques.” In Computer Graphics and Imaging, ed. Martin Kampel, 798:321–326. Calgary, AB, Canada: ACTA Press.
APA
Vulgarakis Minov, Sofija, Cointault, F., Vangeyte, J., Pieters, J., & Nuyttens, D. (2013). Measurement of single droplet characteristics using high speed imaging techniques. In M. Kampel (Ed.), Computer Graphics and Imaging (Vol. 798, pp. 321–326). Presented at the IASTED International conference on Signal Processing, Pattern Recognition and Applications (CGIM 2013), Calgary, AB, Canada: ACTA Press.
Vancouver
1.
Vulgarakis Minov S, Cointault F, Vangeyte J, Pieters J, Nuyttens D. Measurement of single droplet characteristics using high speed imaging techniques. In: Kampel M, editor. Computer Graphics and Imaging. Calgary, AB, Canada: ACTA Press; 2013. p. 321–6.
MLA
Vulgarakis Minov, Sofija, Frédéric Cointault, Jürgen Vangeyte, et al. “Measurement of Single Droplet Characteristics Using High Speed Imaging Techniques.” Computer Graphics and Imaging. Ed. Martin Kampel. Vol. 798. Calgary, AB, Canada: ACTA Press, 2013. 321–326. Print.
@inproceedings{3230122,
  abstract     = {The spray droplets generated by agricultural nozzles play an important role in the application accuracy and efficiency of plant protection products. But, the process of generating and controlling small droplets of high uniformity, constant size and form is complex and difficult to quantify or model. The limitations of the non-imaging techniques and the recent improvements in digital image acquisition and processing increased the interest in using high speed imaging techniques in pesticide spray characterisation.
The goal of this study was to apply an imaging technique to evaluate the characteristics of a single spray droplet using a piezoelectric single droplet generator in a droplet-on-demand mode with 4 glass nozzles and a high speed imaging technique.
Tests were done with a high-speed camera, microscope lenses, and a xenon light source. Image analysis algorithms were developed for droplet sizing and tracking on images gained from this acquisition system.
The experiments have shown that using the selected image acquisition and processing system, different droplet sizes and velocities can be measured. By changing the pulse width and the nozzle orifice size, repeatable droplets could be generated with a size ranging from 135 \ensuremath{\mu}m up to 461 \ensuremath{\mu}m. The ratio between droplet diameter and nozzles orifice opening varied from 1.33 up to 3.42 depending on the settings.},
  author       = {Vulgarakis Minov, Sofija and Cointault, Fr{\'e}d{\'e}ric and Vangeyte, J{\"u}rgen and Pieters, Jan and Nuyttens, David},
  booktitle    = {Computer Graphics and Imaging},
  editor       = {Kampel, Martin},
  isbn         = {9780889869547},
  keyword      = {Droplet characteristics,droplet generator,high speed imaging techniques,image processing},
  language     = {eng},
  location     = {Innsbruck, Austria},
  pages        = {321--326},
  publisher    = {ACTA Press},
  title        = {Measurement of single droplet characteristics using high speed imaging techniques},
  url          = {http://dx.doi.org/10.2316/P.2013.798-058},
  volume       = {798},
  year         = {2013},
}

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