无铅声发射传感器。
Lead-free acoustic emission sensors.
作者信息
Lam K H, Lin D M, Chan H L W
机构信息
Department of Applied Physics, The Hong Kong Polytechnic University, Hunghom, Hong Kong, China.
出版信息
Rev Sci Instrum. 2007 Nov;78(11):115109. doi: 10.1063/1.2814024.
Acoustic emission (AE) sensors have been fabricated using both soft- and hard-type lead-free (Na0.5K0.5)NbO3-based ceramics. The acoustic and electromechanical properties of the ceramics have been determined using the resonance technique. The lead-free AE sensors were calibrated using a laser source and compared to a commercial sensor. A lead zirconate titanate (PZT) 5H ceramics AE sensor has also been fabricated and calibrated for comparison. It was found that the sensitivity of lead-free AE sensors is comparable to that of the lead-based PZT sensor. To evaluate the sensors for potential application, they have been used in the detection of AE in an impact test. The lead-free sensors can reproduce AE signals accurately without giving artifacts and have potential use in commercial AE systems.
已经使用软质和硬质无铅（Na0.5K0.5）NbO3基陶瓷制造了声发射（AE）传感器。使用共振技术测定了陶瓷的声学和机电性能。使用激光源对无铅AE传感器进行校准，并与商用传感器进行比较。还制造并校准了锆钛酸铅（PZT）5H陶瓷AE传感器以作比较。结果发现，无铅AE传感器的灵敏度与铅基PZT传感器相当。为了评估传感器的潜在应用，已将它们用于冲击试验中的声发射检测。无铅传感器可以准确地再现声发射信号而不会产生伪像，并且在商用声发射系统中具有潜在用途。
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