共振を利用した渦電流探傷法の等価回路解析と実証試験

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2014/05/01

タイトル(英語): Equivalent Circuit Analysis and Demonstration of Eddy Current Testing using Resonance

著者名: 小林　徳康（（株）東芝／東北大学流体科学研究所），上野　聡一（（株）東芝），落合　誠（（株）東芝），川尻　裕子（（株）東芝），内一　哲哉（東北大学流体科学研究所），高木　敏行（東北大学流体科学研究所）

著者名(英語): Noriyasu Kobayashi (Toshiba Corporation/Institute of Fluid Science, Tohoku University), Souichi Ueno (Toshiba Corporation), Makoto Ochiai (Toshiba Corporation), Yuko Kawajiri (Toshiba Corporation), Tetsuya Uchimoto (Institute of Fluid Science, Tohoku University), Toshiyuki Takagi (Institute of Fluid Science, Tohoku University)

キーワード: 非破壊検査，渦電流探傷，共振，等価回路解析　　nondestructive inspection，eddy current testing，resonance，equivalent circuit analysis

要約(英語): In order to increase the sensitivity for detecting defects and reduce the voltage gain displacement by the lift-off variation, we demonstrated the improvement of voltage gain from the exciting coil to the detector coil using resonant circuits based on the equivalent circuit analysis. We used three (exciting coil, detector coil and metallic specimen) equivalent circuits that are coupled with each other through mutual induction. The two relationships (exciting coil and specimen, detector coil and specimen) were analyzed using a multi-layer model that consists of the coil, the air and the metal. The mutual inductance between the exciting and detector coils was taken from the result of preliminary experiment without resonance. According to the analysis, the voltage gain increased by up to 6.8 times and the voltage gain displacement reduced using resonance. In the experimental demonstration under the same conditions as the analysis, the increase of voltage gain was consistent with the analysis result within a prediction error of 4 % on average. From this demonstration, we confirmed that the resonant circuits were effective to increase the voltage gain and reduce the voltage gain displacement for improving the characteristics of eddy current testing.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.134 No.5 （2014）

本誌掲載ページ: 340-346 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/134/5/134_340/_article/-char/ja/