Metal-core piezoelectric fibers (MPF) are a new type of piezoelectric ceramic device with small size, and have great
potential to be used as structurally integrated transducers for guided-wave (GW) structural health monitoring. The
response of surface-bonded metal-core piezoelectric fiber (MPF) sensors to Lamb-wave fields is introduced. The
interaction of Lamb waves with damage, e.g. the reflection of the waves at defects, allows the detection of damage in
structures by monitoring the Lamb wave propagation characteristics. The good directional properties of MPF are used to
determine the direction of the reflected Lamb waves by mounting three MPF sensors in a rosette configuration. Two suitably spaced rosettes are used to locate the source of reflection, i.e., the damage, by taking the intersection of the directional lines given by the two rosettes. The performance of the sensor for Lamb wave sensing and damage localization is validated on an aluminum plate.