PMN-PT detector for electron acoustic imaging system

The relaxor-based ferroelectric single crystal 67Pb(Mg_1/3 Nb_2/3)O₃-33PbTiO₃ (PMN-PT) with size of Φ 40×80 mm have been grown by a modified Bridgman method in our lab. Their typical properties are d₃₃~1800 pc/N, K₃₃~0.92 and ε₃₃^T~4200. The crystal is used for designing electron acoustic signal detector in the Electron Acoustic Imaging System (EAIS) which is a new non-destructive technology for microstructure analysis, defects testing beneath the surface and properties study on micro-region. The amplitude of electron acoustic signal detected by PMN-PT detector is twice as high as that of PZT-type detector. The resolution of electron acoustic image is clearly improving. For comparison, the electron acoustic images of ferroelectric domain, stress distribution of aluminum and PZN-PZ-PT ceramic texture were presented using PMN-PT detector and PZT-type detector, respectively. The results show that PMN-PT crystal is particularly useful as a receiving detector in the electron acoustic imaging system and other ultrasonic imaging systems