Performance assessment and validation of piezoelectric active-sensors in structural health monitoring

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A review of damage detection methods for wind turbine blades (2015, background): “Through computing the slope of the imaginary part of the admittance (inverse of the IMP) in the low frequency range, which is largely independent of the health state of its host blade, the self-diagnosing ability of PZT sensors can be achieved (Park et al 2006, Taylor et al 2012).”
Development of an impedance-based wireless sensor node for structural health monitoring (2007, background): “determines the operational status of piezoelectric active-sensors in SHM ( Park et al. 2006a; 2006b ).”
Crack detection and characterization techniques—An overview (2014, background): “, [46]) can be used as both actuators that generate elastic waves and detectors of the waves incoming from other piezoelectric elements.”