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Title: Lead-free acoustic emission sensors
Authors: Lam, KH
Lin, D
Chan, HLW 
Keywords: Acoustic emission testing
Acoustic transducers
Electromechanical effects
Potassium compounds
Sodium compounds
Issue Date: 28-Nov-2007
Publisher: American Institute of Physics
Source: Review of scientific instruments, 28 Nov. 2007, v. 78, 115109, p. 1-4 How to cite?
Journal: Review of scientific instruments 
Abstract: Acoustic emission (AE) sensors have been fabricated using both soft- and hard-type lead-free (Na[sub 0.5]K[sub 0.5])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.
ISSN: 0034-6748
Rights: © 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in K.H. Lam, D.M. Lin, and H.L.W. Chan, Rev. Sci. Instrum. 78, 115109 (2007) and may be found at
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