Performance Assessment of Inter-Digital Capacitive Structure-Finite Element Approach
Incorporation of modern sensors and software functionalities has transformed traditional measuring instruments into smart ones. Even though capacitors are passive components, they find extensive applications as sensors to measure parameters such as pressure, acceleration, proximity, electric/magnetic fields and material properties. Capacitor-based systems also find wide applications in touch-screen systems. In all these systems, the measured capacitance is the input to an automated system. Response of the system to variations in the input capacitance needs to be understood and analyzed for the design of any system for optimum performance. Currently inter-digital capacitive sensors with different configurations are under development for various applications. Finite element methods provide an approximate solution to modeling problems by numerical tools. The computed values can be compared with measured ones for validation. Modeling helps to vary the parameters like area of the electrode, gap between the electrodes and the dielectric constant and to investigate the effect of each on the effective capacitance value of a multi-element inter-digital capacitor configuration. Such a configuration has been modeled and analyzed using the finite element analysis tool ANSYS 15.0. The results of the analysis will be presented and discussed.
KeywordsInter-digital capacitive sensor Finite element method ANSYS
The first author would like to acknowledge Mr. Akash Rajan, Research Scholar, College of Engineering, Thiruvananthapuram, Kerala, India, for his valuable help.
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