An enhanced piezoelectric impedance approach for damage detection with circuitry integration

Due to their two-way electromechanical coupling, piezoelectric transducers can be used for impedance or admittance-based damage detection, in what is hereafter referred to as the piezoelectric impedance-based approach. Such an approach has been recognized as being sensitive to small-sized damage, as the piezoelectric impedance or admittance can be measured at relatively high frequencies. In an earlier work we have demonstrated that integrating a tunable inductor with the piezoelectric transducer to form an inductive resonant circuit can amplify both the admittance measurement magnitude and the damage-induced admittance anomaly. In this research, we investigate further enhancing the piezoelectric impedance approach for damage detection by means of circuitry integration. In particular, we introduce a negative capacitance element into the inductive circuitry, and then explore an alternative circuitry topology. It is demonstrated that the negative capacitance can broaden the measurement amplification effect due to the circuitry resonance to a much wider frequency range, thereby increasing the damage detection accuracy and sensitivity. It is also verified that, compared to the previous serial connection between the inductor and the resistor (used to facilitate the admittance measurement), a parallel connection of these two elements can amplify the voltage drop across the resistor, which increases the signal-to-noise ratio in the sensor measurement. Extensive numerical and experimental studies are carried out to illustrate the effectiveness of our proposed enhancements.

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