Extraction of crack indications from detection signals based on signal phase characteristics in eddy current testing

Toshihiro Yamamoto, Toshiyuki Takagi, Tetsuya Uchimoto

研究成果: Article査読

抄録

This paper shows phase characteristics of crack indications obtained with a 48-channel ECT system, and proposes a method to reduce noise and extract crack indications from detection signals of this ECT system based on these phase characteristics. Because this ECT system performs two kinds of scanning patterns : U-scan and T-scan, and obtains two sets of signal distributions for one scanning area simultaneously, the proposed method uses a two-stage process that includes so-called a main filter and a sub filter. While the main filter uses the phase information of the same scanning pattern by which the target signals are obtained, the sub filter uses the phase information of the other scanning pattern for the target signals. Using these two filters imposes more strict conditions on extracting crack indications so as to reduce more noise. The results of a round robin test shows that this filtering method is effective to extract crack indications from the background of complicated noises.

本文言語English
ページ(範囲)117-125
ページ数9
ジャーナルNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
76
761
DOI
出版ステータスPublished - 2010 1月

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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