Lead-free acoustic emission sensors |
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| Authors: | Lam K H Lin D M Chan H L W |
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| Affiliation: | Department of Applied Physics, The Hong Kong Polytechnic University, Hunghom, Hong Kong, China. kokokh.lam@polyu.edu.hk |
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| Abstract: | 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. |
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