Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Sensitivity Properties of Acoustic Emission Sensor Using NKN System Ceramics

NKN계 세라믹을 이용한 음향방출 센서의 감도 특성

  • Hong, Jae-Il (Department of Electrical Engineering, Dong Seoul College) ;
  • Shin, Sang-Hoon (Department of Electrical Engineering, Semyung University) ;
  • Yoo, Ju-Hyun (Department of Electrical Engineering, Semyung University) ;
  • Jeong, Yeong-Ho (Department of Electrical Engineering, Korea National University of Transportation) ;
  • Lee, Sang-Ho (Department of Electrical Engineering, Dong Seoul College)
  • 홍재일 (동서울대학교 전기정보제어과) ;
  • 신상훈 (세명대학교 전기공학과) ;
  • 류주현 (세명대학교 전기공학과) ;
  • 정영호 (한국교통대학교 전기공학과) ;
  • 이상호 (동서울대학교 전기정보제어과)
  • Received : 2014.09.01
  • Accepted : 2014.10.22
  • Published : 2014.11.01
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Abstract

In this study, in order to develop coupled vibration mode piezoelectric devices for Acoustic Emission (abbreviated as AE) sensor application with outstanding displacement and piezoelectric properties have been simulated by ATILA FEM program. And, From the results of ATILA simulation, the AE sensor specimen, obtained superior electromechanical coupling factor and displacement, when the size of specimen is $3.45mm{\Phi}{\times}3.45mm$ with ratio of diameter/thickness(${\Phi}/T$)= 1.0. Therefore, AE sensor was fabricated by (Na,K,Li)(Nb,Ta) $O_3$(abbreviated as NKL-NT) system piezoelectric ceramics using coupled vibration mode. The piezoelectric properties of NKL-NT ceramics was exhibited that piezoelectric constant($d_{33}$), piezoelectric voltage constant($g_{33}$) and electro mechanical coupling factor($k_p$) have the excellent values of 261[pC/N], 40.10[$10^{-3}Vm/N$], and 0.44, respectively. The manufactured piezoelectric device with ratio of ${\Phi}/T$= 1.0 indicated the optimum values of resonant frequency(fr)= 556.5[kHz], antiresonant frequency(fa)=631.1[kHz], and effective electromechanical coupling factor(keff)= 0.473. The maximum sensitivity of the coupled vibration mode AE sensor was 55[dB] at the resonant frequency of 75[kHz]. The results show that the coupled vibration mode piezoelectric device is a promising candidate for the application AE sensor piezoelectric device.

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References

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