Chirp-based impedance spectroscopy of piezo-sensors

Impedance spectroscopy is widely used in various test& measurement fields and applications. In current paper a novel approach of excitation with chirp signal with simple time-domain analysis of response signal for such task is introduced and described with examples of measurement of the electro-mechanical impedance of piezo-sensors, in the frequency range of several hundred kiloherz. In one approach smoothed separately (by Savitzky-Golay filter) of excitation voltage and (current) response signals in a sliding window are found and their ratio is used for impedance module estimation, at corresponding time and frequency values. Alternative method for vector measurement of impedance spectra in time domain has also tested.