Abstract: For the application of electrical impedance spectroscopy to the anomaly detection of composite material component, a pulsed method for impedance spectroscopy measurement, different from the traditional swept frequency methods, is presented. A string of square-wave pulses is digitally generated as the exciting signal to the sensing electrodes. A step sampling method for collecting the instantaneous response current curves is realized on the basis of a field programmable gate array (FPGA) chip. The collected curves are further processed to obtain the impedance spectroscopy. Experiments are carried out for the measurement of electrical impedance spectroscopy of the demo electric circuits in order to verify the feasibility and practicability validity of the pulsed measurement system. The preliminary experimental results indicate that the pulsed measurement system can effectively extract the electrical impedance spectroscopy information of the detected object. The proposed approach is feasible and practicable for evaluating the electrical impedance spectroscopy of the detected object.

Key words: Electrical impedance model, Electrical impedance spectroscopy, Field programmable gate array, Pulse excitation, Pulsed measurement system