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Evaluation of Fresh Water Fish Freshness Based on Impedance Characteristics

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

Citation:  2007 ASAE Annual Meeting  076139.(doi:10.13031/2013.23460)
Authors:   Jun (or initial) Zhang, Xiao Yu Li, Xi Wen (or initial) Luo, Wei Wang, Wu (or initial) Xiao
Keywords:   Electrical properties; Impedance; Fresh water fish; Crucian; Freshness; LabVIEW;TVB-N

Impedance characteristics of fish during storage are important parameters for non-invasive measurement of fish freshness. An impedance measurement system with four-electrode was constructed based on bio-impedance theory and LabVIEW. The effect on impedance characteristics of fish crucian tissue by different excitation frequency, measuring direction, measuring position and electrode type were researched. The results indicates that the fish impedance decreases and phase angle increases while the frequency increases, the impedance measured parallel to the side is bigger than the impedance measured vertical to the side. Different measured position results in different impedance; even at the same measuring position, different decay time gets different impedance. The composite electrode, gill of fish and the excitation frequency of 591Hz were suitable for researching on the impedance characteristics of fish due to its stable and accurate test signal. When measured vertical to the side, the gill impedance is less than 91.91O (while measured parallel is 99.61O), and the gill phase angle is less than 5.06°(while measured parallel is 4.94°), it indicates the spoilage of the fish.

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