PZT Transducer Response to an Epicentral Acoustic Emission Signal During Glass Capillary Breakage

Abstract

The observed acoustic emission (AE) signals of PZT transducers during glass capillary breaking were compared with the theoretical AE signals based on the AE system approach. The AE system composed of (1) an AE source: a glass capillary breaking, (2) a propagating medium: a glass plate, (3) a detector: a PZT transducer and (4) a signal processing unit: a digital oscilloscope was nearly constant in order to minimize the diculty of the AE system approach, but the thickness of a PZT transducer with a consistent diameter was adjusted to change the resonant frequency. The theoretical AE signals were obtained by using the Mason equivalent circuit and a point loading on a glass plate with a ramped functional dependence for a force strength of 10 N and a rise time of 280 ns. The observed AE signals compared with the theoretical AE signals had pulse-type AE signals and continuous-type AE signals with low frequencies. The pulse-type AE signals may originate from the thickness mode of the PZT transducer and the continuous-type AE signals may originate from the radial mode of the PZT transducer.