An analysis of impedance sensing in lard detection

Abstract

This paper aimed to analyze the effect of electrode spacing and number of electrode fingers of interdigitated electrode (IDE) design for impedance based lard characterization. Two types of interdigitated electrode (IDE) sensor was designed with two different spacing and each type have five different numbers of fingers. Impedance measurement is taken by using precision LCR meter 4285A where the frequency used to measured at 4MHz to 5 MHz. The graph of results show the relationship of impedance, frequency supplied and number of electrode teeth with two differences electrode gap of sensor A and sensor B. It was found that the Sensor A with 50 electrode fingers and width of electrode is 0.5 mm with spacing gap of 0.35 is choosen because higher R squared which is 99.5% compared to the Sensor B with same number of fingers and width but different spacing gap is 0.4 mm has 99.4% of R squared value. This is due to the impedance measurement is more sensitive by increasing the contact surface between the electrodes and the sample under test and the effective electrode area is increased. The data analysis is conducted to quantify and characterize the lard sample. And finally, from this data analysis, the impedance characterization are potential for providing the information about lard detection.