Abstract
A new electrical dry method for density sorting of spherical fruits, which measures the volume by electrical capacitance and mass by electronic balance, was proposed. A exact relation between the capacitance of concentric double spheres and the volume of the inner sphere was used for measuring the volume of spherical fruit. The accuracy of measured volume was very high. The new automatic and continuous density sorting system for sorting hollow heart and over-mature watermelons based on this study was developed and tested. A new packing house for sorting hollow watermelons using this dry method was constructed and operated successfully.
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