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http://dx.doi.org/10.9714/psac.2010.12.3.044

Study on Improvement of the Piezoelectric Properties of Acoustic Emission Sensor to be Used for Superconducting Application Systems  

Kim, K.J. (고려대학교 신소재공학과 초전도연구실 그룹)
Kim, J.H. (고려대학교 신소재공학과 초전도연구실 그룹)
Song, J.B. (고려대학교 신소재공학과 초전도연구실 그룹)
Paik, J.H. (한국세라믹기술연구원)
Jang, J.Y. (연세대학교 전기공학과 초전도응용 연구실)
Ko, T.K. (연세대학교 전기공학과)
Lee, H.G. (고려대학교 신소재공학과)
Publication Information
Progress in Superconductivity and Cryogenics / v.12, no.3, 2010 , pp. 44-48 More about this Journal
Abstract
Acoustic emission (AE) signal from an HTS tape has a low signal to noise ratio, due to the large amount of noise caused by the boiling of the liquid cryogen or mechanical vibration from the cryo-cooler. In an attempt to improve the sensitivity of the AE sensor, $Pb(Zr_{0.54}Ti_{0.46})O_3$ + 0.2 wt% $Cr_2O_3$ + 1.0 wt.% $Nb_2O_5$ ceramics sintered at $1200^{\circ}C$ was synthesized. In addition, the resonance ($f_r$) and anti-resonance frequencies ($f_a$) were measured using the specimens with various thicknesses (1.0, 1.5, 2.0, 2.5 and 3.0 mm). According to the test results, large AE signals with high frequencies were obtained from the AE sensor fabricated using a piezoelectric disc with a thinner thickness.
Keywords
superconductor; piezoelectric; acoustic emission (AE);
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