Fabrication of a High Performance Acoustic Emission (AE) Sensor to Monito and Diagnose Disturbances in HTS Tapes and Magnet Systems

An acoustic emission (AE) technique was introduced as a non-destructive method to monitor sudden deformation caused by local heat concentrations and micro-cracks within superconductors and superconducting magnets. However, the detection of AE signals in a high temperature superconductor (HTS) tape i...

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Bibliographic Details
Published in:Metals and materials international 2010-02, Vol.16 (1), p.109-113
Main Authors: Kim, Ju-Hyung, Song, Jung-Bin, Jeong, Young Hun, Lee, Young-Jin, Paik, Jong-Hoo, Kim, Woo-Seok, Lee, Haigun
Format: Article
Language:English
Subjects:
Acoustic emission
Boiling
Deformation
Dielectric properties
Disturbances
High temperature superconductors
Liquids
Microcracks
Monitors
Noise
Nondestructive testing
Performance enhancement
Piezoelectric ceramics
Piezoelectricity
Sensors
Signal to noise ratio
Sintering
Superconducting magnets
Superconducting tapes
Superconductors
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Summary:An acoustic emission (AE) technique was introduced as a non-destructive method to monitor sudden deformation caused by local heat concentrations and micro-cracks within superconductors and superconducting magnets. However, the detection of AE signals in a high temperature superconductor (HTS) tape is not easy because of its low signal to noise ratio caused by the noise from boiling liquid cryogen or mechanical vbration from the cryo-cooler. Therefore, high performance piezoelectric ceramics are needed to improve the sensitivity of the AE sensor. The aim of this study was to improve the piezoelectric and dielectric properties to enhance the performance of an AE sensor. This study examined the effects of Nt(s addition (0.0 wt.% to 2.0wt.%) on the properties of high performance piezoelectric ceramics, Pb(Zr(0.54) Ti(0.46))O(3) + 0.2 wt.% Cr(2)O(3), sintered at 1200 degree C for 2 h. The performance was examined with respect to the acoustic emission response of AE sensors manufactured using the specimens with various Nb(2)O(5) contents. Superior sensor performance was obtained for the AE sensors fabricated with the specimens containing 1.0 wt.% to 1.5 wt.% Nb(2)O(5). The performance and characteristics of the AE sensors were in accordance with their piezoelectric and dielectric properties.
ISSN:1598-9623
DOI:10.1007/s12540-010-0109-5