An equivalent electrical network of an electronic tongue: A case study with tea samples

Electrical equivalent of a physical process helps uncover important information about the characteristics of the process. In this paper, an equivalent electrical circuit of electronic tongue has been presented following system identification techniques with tea infusion as an analyte. The electronic tongue is often used for the detection of important bio-chemical quality markers of various food items. The steady and transient responses obtained from the electronic tongue during experiments contain valuable information regarding the characteristics of tea sample. In order to overcome the problems associated with the existing model, the process model has been modified for the given system. Unlike the existing equivalent circuit of the three electrode electrochemical system, the proposed circuit is able to produce similar output response as that of the actual electronic tongue system. A new equivalent circuit has been presented and the circuit parameters have been calculated.