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홍재일,신상훈,류주현,정영호,이상호,Hong, Jae-Il,Shin, Sang-Hoon,Yoo, Ju-Hyun,Jeong, Yeong-Ho,Lee, Sang-Ho 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.11
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.
무연 BNKT세라믹스를 이용한 危害전력설비 접근 직접감지용 압력센서에 관한 연구
洪在一(Jae-Il Hong),柳周鉉(Ju-Hyun Yoo) 대한전기학회 2006 전기학회논문지 P Vol.55 No.1
A infrared rays sensor or ultrasonic sensor can detect the object at the narrow area, however a pressure sensor can detect man and animal at the wide area. It is necessary to manufacture the sensor by using Pb-free ceramics in the respect of environmental protection. Piezoelectric properties of ceramics added 0.2wt% La₂O₃ into 0.96Bi0.5(Na0.84K0.16)0.5+0.04SrTiO₃ were 0.4 of kp, 31×10?³ Vm/N of g₃₃. The output voltage of the pressure sensor is 0.48 V at 20 inH₂O. The output voltage of the pressure sensor with driving circuit is 9.8 V. 37 ㎳ width.