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A Low-Cost Spot Laser and Camera System for Fluorescent Dye Detection of Agricultural Aircraft Pattern Collection Strings

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Applied Engineering in Agriculture. 34(1): 187-193 . (doi: 10.13031/aea.12454) @2018
Authors:   Randy R. Price
Keywords:   Aerial application, Collectors, Fluorescence, Lasers, Spray Deposition.

Abstract. A low-cost dye detection system was developed for pattern testing agricultural aircraft. The system uses a green laser pointer, a USB web camera outfitted with a standard rhodamine filter, and software to threshold the images. When arranged in a 90° illumination chamber, the system was able to detect spray patterns on strings that matched patterns derived from a standard WRK fluorometer system with a numerical comparison of 85% and a coefficient of variation of 17%. Visual assessment indicated an 86% match and all major peaks, valleys, and patterns were correctly indicated. A field test with the system indicated that correct airplane adjustments were possible with the system and advantages include that it is easy-to-build, composed of low-cost components, and the operator can see the string fluorescence during analysis. This system may provide an alternate dye detection system for pattern testing strings from agricultural aircraft.

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