Sensitivity Characteristics of Acoustic Emission (AE) Sensor Using Thickness-Shear-Mode Piezoelectric Device

摘要

In this study, Acoustic Emission (AE) sensor was fabricated with the rectangular type Pb(Mg_(1/2)W_(1/2))O_3-Pb(Ni_(1/3)Nb_(2/3))O_3-Pb(Zr_(0.5)Ti_(0.5))O_3 (abbreviated as PMW-PNN-PZT) ceramic piezoelectric device using thickness shear mode. From the results of ATILA simulation, the specimen with the size of 8 6 8 mm~3 was determined as the experimental piezoelectric device which shows the excellent thickness shear mode. Electromechanical coupling factor kp, piezoelectric constant d_(33) and g_(33) of PMW-PNN-PZT ceramics showed the excellent values of 0.63, 573 [pC/N], and 29.81 [10~(-3)Vm/N], respectively, suitable for AE sensor device application. Thickness shear mode electromechanical coupling factor k_(15) was 0.61 at the specimen with the size of 8 6 8 mm~3. The peak sensitivity of AE sensor using this thickness-shear-mode piezoelectric device showed 79 [dB] at 29.4 [kHz].