Acoustic emission signal response of piezoelectric fiber composites

Piezoelectric fiber composites (PFCs) were fabricated by cutting-filling methods to be used as acoustic emission (AE) sensors. The AE sources were simulated by pencil lead broken, the AE signals were collected in the test plate and the linear localization of sound source was measured based on acoustic emission technology. The results showed that the obtained AE signal amplitudes and voltages of PFCs exhibited dependence on the measuring distances and angles. The AE signal amplitudes were different in the orthogonal direction which indicated that the PFCs exhibited well orthotropic property. The attenuation curves showed that the trend of signal attenuation gradually slowed down as the distance increased. The lead broken signals were acquired by the sensors for each time and the accuracy of linear positioning was above a percentage of 95, which indicated that the PFCs possessed good sensitivity and good signal responses to achieve the purpose of positioning and had high accuracy in the process of linear localization.