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A Pulsed Approach for Electrical Impedance Spectroscopy Measurement

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 excitation signal to the sensing electrodes. A pulsed measurement system is described. A sample-collecting method for sampling the instantaneous response signals is implemented based on a field programmable gate arrays chip. The sampled data is further processed to obtain the impedance spectrum. Experiments are carried out for the measurement of electrical impedance spectroscopy of the demo electric circuits in order to inspect the feasibility 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 object detected. The proposed approach is feasible for evaluating the electrical impedance spectroscopy of the object detected.