Development of an imaging system for single droplet characterization using a droplet generator

Sofija Vulgarakis Minov, F Cointault, Jürgen Vangeyte, J G Pieters, Bilal Hijazi, David Nuyttens

    Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureC1: Artikels in proceedings van wetenschappelijke congressen, die niet inbegrepen zijn in A1, A2, A3 of P1

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    The spray droplets generated by agricultural nozzles play an important role in the application accuracy and efficiency of plant protection products. 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 develop an imaging technique to evaluate the characteristics of a single spray droplet using a piezoelectric single droplet generator and a high speed imaging technique. Tests were done with different camera settings, lenses, diffusers and light sources.
    The experiments have shown the necessity for having a good image acquisition and processing system. Image analysis results contributed in selecting the optimal set-up for measuring droplet size and velocity which consisted of a high speed camera with a 6 µs exposure time, a microscope lens at a working distance of 43 cm resulting in a field of view of 1.0 cm x 0.8 cm and a Xenon light source without diffuser used as a backlight.
    For measuring macro-spray characteristics as the droplet trajectory, the spray angle and the spray shape, a Macro Video Zoom lens at a working distance of 14.3 cm with a bigger field of view of 7.5 cm x 9.5 cm in combination with a halogen spotlight with a diffuser and the high speed camera can be used.
    TaalEngels
    TitelCommunications in Agricultural and Applied Biological Sciences
    Aantal pagina's12
    Volume77
    UitgeverijUniversiteit Gent
    Datum2012
    Uitgave4
    Pagina's469-481
    ISBN van geprinte versie1379-1176
    StatusGepubliceerd - 2012
    Evenement64th International Symposium on Crop Protection (2012) - Gent, België
    Duur: 22-mei-201222-mei-2012
    http://www.iscp.ugent.be/

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