Mechanical parameters characterization of planar FEF fingers for pH sensor

This paper presents a study of Planar Fringing Electric Field (FEF) as a pH sensor. Fringing Electric Field or FEF is widely used as a structure to detect capacitance in material under test (MUT). The study is carried out using Inter Digital Capacitor (IDC) technique on Printed Circuit Board (PCB). This study is to investigate the effectiveness of using IDC as to reduce the cost of making sensor. The study focused on the effect of using Ground, number, width and length of finger on the PCB. This paper also presents both simulation and experimental data to characterize the sensor.. The results show that the trend pattern of both simulation and experiment are similar and for the series IDC, the capacitance is decreasing as the number of series IDC increased.