Desenvolvimento de um sistema microcontrolado para aquisição de impedância e análise por espectroscopia de impedância eletroquímica

Abstract

This work aimed to develop a low-cost system for impedance measurement, using the method of Electrochemical Impedance Spectroscopy (EIE) to assist in the analysis of chemical quantifiers, corrosion systems and other areas of electrochemistry. This system consists of on board software and hardware components, which perform the impedance measurement through microcontrolled platforms, microprocessor, data acquisition system and impedance converter (AD5933), employing concepts of digital signal processing, filtering methods and signal manipulation through analog circuits. Tests were performed with chemical and electronic impedance samples. The results obtained for resistive and capacitive electronic circuits were compared with the theoretical calculations; for chemical impedance the behavior of the curve generated by both the proposed device and the commercial Sensit Smart equipment was evaluated. As a result, an impedance error of 1% was obtained for purely resistive loads and 6% for capacitive loads. Regarding the chemical sample, a similarity was observed in the curves generated by the devices, showing that the developed system proves to be a low-cost alternative capable of performing impedance acquisition and analysis.