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Researchers and applicators commonly use water-sensitive paper as a method for assessing the droplet sizespectra and deposition quality from an application of agrochemicals. Three imaging systems (USDA-ARS and Swath Kit.camera-based systems and DropletScan. scanner-based system) were compared using two sets of water-sensitive papersfrom an aerial application spray test. Although the systems used different spread factor equations to calculate actual dropletsizes from the stain sizes on the card, and different sample definition and data processing systems, there were high correlationsbetween the three systems for three of the droplet size spectra parameters tested (DV0.1, DV0.5, and DV0.9) and slight to nocorrelations between the systems based on the droplet spectra parameter called relative span. The information presented willallow researchers to be confident that droplet sizing data collected from either system will produce similar results and thatthe results can be compared.
Hoffmann et al. (Sat,) studied this question.