Time-frequency Analyses of AE Signals in YBCO Superconductors

Nozomu Nanato, N. Takemoto

Research output: Contribution to journalConference article

Abstract

AE (Acoustic Emission) measurements are well known methods to detect mechanical signals from superconducting coil The mechanical signals could be generated by micro cracks of epoxy resins, the motion of superconductors and the thermal expansion of superconductors, which were generated before and/or after a quench. We have presented a time-frequency visualization of AE signals as a method to detect the quench. We can detect very small AE signals regardless of lectromagnetic noises and can find the time of the AE occurrence and the frequency bands of AE signals by using this method. Recently it has been presented that YBCO superconductors are delaminated and degraded by a transverse tensile stress. The delamination is accompanied with AE signals. Also, it is known that amplitudes and frequency bands of AE signals vary with causes of AE occurrence. In this paper, we present time-frequency analyses of AE signa s caused by the delamination of a YBCO superconductor and the micro of epoxy resins.

Original languageEnglish
Pages (from-to)256-259
Number of pages4
JournalPhysics Procedia
Volume58
DOIs
Publication statusPublished - Jan 1 2013
Event26th International Symposium on Superconductivity, ISS 2013 - Tokyo, Japan
Duration: Nov 18 2013Nov 20 2013

Keywords

  • Acoustic Emittion
  • delamination
  • epoxy crack
  • ime-frequency analyses
  • YBCO superconductor

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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