Development of Interdigitated Electrodes for Cooking Oil Detection Using AD5933 Impedance Analyzer

Izyani Mat Rusni; Sasichandran Rabichandran

Izyani Mat Rusni Universiti Selangor
Sasichandran Rabichandran

Keywords: Impedance Analyzer, Interdigitated Electrode, Sensor

Abstract

This study consists of designing Interdigitated Electrodes (IDE) using AutoCAD for chemical solution detection. Three types of IDE sensors were designed based on different types of parameters such as length, width, space between electrodes and sensing area and the effect of electrode spacing and electrode length were then analysed for chemical solution characterization. The IDEs were fabricated on FR4 using photolithography techniques. The sensing approach was based on distinguishing a shift in impedance value of the sensor when material under test is introduced at the sensing area. The IDEs were then experimentally presented as sensing elements for characterization of liquid substances such as tap water, distilled water, ethanol, methanol, vegetable oils with animals fat. The impedance measurements were collected and analysed using LCR Meter and AD5933 Impedance Analyzer. Data that has been obtained from impedance analyzer were then tabulated using Microsoft Excel. From the experiment conducted, an observable shift of impedance values was identified upon the introduction of material under test. It is identified all the parameters affect the impedance value of the chemical solvents. Therefore, the impedance measurement given by the proposed sensors is very potential to provide information for liquid detection.

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