Design of an active-differentiator-based capacitance transducer for electrical capacitance tomography

This paper focuses on the development of new sensor electronics for electrical capacitance tomography to increase the measurement accuracy and, accordingly, to enhance the system performance in terms of image resolution, and the data acquisition speed. The new system relies on the use of the unknown capacitance in an active differentiator. Applying an appropriate input signal to the differentiator gives an output which can easily be translated into the capacitance.