Usability Evaluation and Characterization of Active Electrodes in Electrical Impedance Tomography

This paper proposes an active electrode design for electrical impedance tomography with enhanced noise robustness and dynamic range to measure voltages from 48 V to 26 mV from DC to 40 kHz with posibility to extended its frequency range up to 100 kHz. The design incorporates a combination of a programmable-gain amplifier and a programmable voltage divider to achieve its voltage range. The paper also provides a description of evaluation methods used to measure the frequency response performance of the proposed design. The active electrode aims to provide a versatile laboratory solution to diverse electrical impedance tomography applications.