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An Innovated Non-contact capacitive Method in fill level inspection

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

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1008371.(doi:10.13031/2013.29616)
Authors:   Maocheng Zhao, Ronghua Ju, Liang Qi, Xiwei Wang
Keywords:   fill level Inspection, non-contact measurement, capacitive sensor; control circuit

A rapid growth of the beverage industry has been witnessed in China during the past two decades. Meanwhile, more attention has been paid to product quality with net content as one of its dimensions. Though quantitative filling technology such as flowmeter has been used in the control of net content in beverage filling, equipments monitoring the actual fill level are also needed. A non-contact capacitive method for this purpose is proposed and a non-contact capacitive sensor is developed based on the rationale that beverages are usually of dielectric constants much higher than their bottles, consequently the capacitance of a filled bottle is determined by its fill level. i.e., the higher the fill level of a bottle is, so would be its capacitance. The non-contact capacitive device developed for fill level inspection consists of a capacitive sensor and a control system. The operational effectiveness of the device was tested on beer in glass bottles and water in plastic bottles, with the results showing a relative broad applicability and desirable accuracies.

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