Robust piezo impedance magnitude measurement method

Abstract

Piezo impedance spectroscopy is widely used in structural health monitoring (SHM) applications. Purpose of the research was to find most robust and cheap method for impedance magnitude measurement. Proposed system consists of analog front end (AFE), signal synthesizer and microcontroller unit. AFE enables to use low sampling rate, while using high frequency excitation signal. Proposed system uses chirp excitation signal in 20kHz- 600kHz frequency range. Results were compared against measurements made with commercial impedance analyzer. Results show great potential for this method in SHM applications.