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Evaluation of the spray characteristics of a single droplet with imaging techniques

Select frames for video . Convert the frames into binary. Noise remove. Label the droplet. Calculation of the droplet area and circularity. Pass droplets with circularity between 0.7 and 1. True. Droplet diameter and velocity. False.

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Evaluation of the spray characteristics of a single droplet with imaging techniques

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  1. Select frames for video • Convert the frames into binary • Noise remove • Label the droplet Calculation of the droplet area and circularity Pass droplets with circularity between 0.7 and 1 True Droplet diameter and velocity False 1) AgroSup Dijon – UP GAP – 26, Bd Dr Petitjean – BP 87999 – 21079 Dijon cedex – France 2) Institute for Agricultural and Fisheries Research (ILVO) - Technology and Food Science Unit, Agricultural Engineering Research Group – Burg. Van Gansberghelaan 115 – 9820 Merelbeke – Belgium 3) Department of Biosystems Engineering – Faculty of Bioscience Engineering- Ghent University – Coupure Links 653-9000 Gent - Belgium Evaluation of the spray characteristics of a single droplet with imaging techniques S. VULGARAKIS MINOV1&2, F. Cointault1, D. NUYTTENS2, J. Vangeyte2, J. PIETERS3, B.HIJAZI1&2 Motivation Application accuracy and efficiency of plant protection products Maximization of spray efficiency and minimizing residues and off target losses Pesticides Sprayers Nozzles • Development of accurate spray • quantification techniques. • Improvement of existing techniques The goal is to evaluate the droplet spray characteristics with a droplet generator and imaging technique. Material and methods Droplet generator Image acquisition system Droplet generator setup:1-Droplet generator with piezoelectric element, 2-HS camera & lens, 3-Light source, 4-PC, 5-Pressure supplier, 6- Signal amplifier, 7- Pulse generator, 8- Liquid tank. FOV: 10.5 mm x 8.4mm. Camera settings: 1000 fps at 6 µs exp.time. 1 pixel = 8.227 µm Droplet generator: 1-Glass nozzle,2-Piezoelectric element, 3-Clamp, 4-Tubes. Tested parameters Droplet on demand mode Droplet generator T Amplifier ±Vp-p ± ta Tracking single droplet ± tp An example of a driving rectangular pulse used to generate droplets where: ta is absorption time, tp is pulsation time and Vp-pis the amplitude of the pulse voltage. The pulse width parameters for single droplet generation differ for every nozzle. Algorithm description • Nozzle • Droplet • Binary image • Droplet label • Droplet center location • Image background • Droplet velocity Results and discussions The smaller the nozzle orifice the harder the droplet generation due to surface tension at nozzle exit. On demand droplets produce in a repeatable way of size 134 - 461 µm with droplet ejection velocity from 0.080 – 1.250 m/s. Results showed dependence between the droplet initial characteristics and the pulse width and voltage amplitude. AGROSUP DIJON INSTITUT NATIONAL SUPÉRIEUR DES SCIENCES AGRONOMIQUES DE L’ALIMENTATION ET DE L’ENVIRONNEMENT Département Agronomie Agroéquipements Elevage & Environnement (D2A2E) 26 Bd Dr Petitjean - BP 87999 - 21079 Dijon cedex - France  +33 (0)380772348 -  +33 (0)380772551 – Site Web : http://www.agrosupdijon.fr

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