Image processing in eddy-current testing for extraction of orientations of defects

フォーマット:

論文

責任表示:

Taniguchi, T. ; Nakamura, K. ; Yamada, Sotoshi ; Iwahara, Masayoshi ; 山田, 外史 ; 岩原, 正吉

言語:

英語

出版情報:

The Japan Society of Applied Electromagnetics and Mechanics (JSAEM) = 日本AEM学会, 2001

著者名:

Taniguchi, T.

Nakamura, K.

Yamada, Sotoshi

Iwahara, Masayoshi

山田, 外史

岩原, 正吉

続きを見る

掲載情報:

International Journal of Applied Electromagnetics and Mechanics

ISSN:

1383-5416      

巻:

14

通号:

1-4 SPEC

開始ページ:

503

終了ページ:

506

バージョン:

publisher

概要:

This paper presents an image processing method for eddy-current testing for the detection of the defects with a specific orientation. The method utilizes the fact that a line-shaped signal is, through the Fourier transform, mapped onto a line passing through the origin and perpendicular to the orientation of the original signal. Hence, nonseparable fan filters is used to select the frequency components corresponding to the defects orientated in a Specific direction. This … approach enables more precise control of the extraction characteristics of signals compared to the iterative application of one-dimensional (1-D) filtering in the vertical and horizontal directions, in which the shape of the pass band is restricted to a geometry made from squares. The effectiveness of the proposed method is shown by a demonstration using a metallic sample with a defect aligned in a number of directions. 続きを見る

URL:

http://hdl.handle.net/2297/00049205