Towards high-bandwidth capacitive imaging

This paper presents an initial step toward high-bandwidth electroquasistatic (EQS) imaging. This system uses a capacitively-coupled electrode array excited at high frequencies in order to distinguish various features such as a dielectric layer or a variable air gap. Further, this system can potentially image depth information and dielectric composition by using multi-wavelength electrode arrays. This paper presents high-speed drive electronics and corresponding driven electrode arrays. The sensor signal is measured with a commercial impedance analyzer.