Study on Wideband High-Sensitivity Dual-Resonance Acoustic Emission Sensor Based on PMN-PT
The acoustic emission sensors are widely employed in the partial discharge detection,but those based on PZT piezoelectric ceramics are difficult to meet the increasing demands for sensitivity and bandwidth simultane-ously.This study designs a dual-resonance acoustic emission sensor using high-performance ferroelectric single crys-tal PMN-PT as the piezoelectric vibrator.The resonant peak coupling is used to improve the sensitivity and band-width simultaneously.The fabricated sensor demonstrates a remarkable sensitivity of 76.2 dB,along with a wide bandwidth of 20 kHz to 105 kHz.It exhibits excellent stability,surpassing PZT-5H-based acoustic emission sensors in sensitivity and signal-to-noise ratio.
PMN-PT single crystalPZT-5H ceramicsdual-resonance acoustic emission sensorpartial dis-charge detectionFEM
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