A Study of the Crack Depth Estimation on a Conducting Surface

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  • 電磁波を用いた導体表面上のクラックの深さ推定に関する一考察
  • デンジハ オ モチイタ ドウタイ ヒョウメン ジョウ ノ クラック ノ フカサ スイテイ ニ カンスル イチ コウサツ

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An algorithm to estimate non-destructively the depth of a crack has been proposed in this paper using electromagnetic waves. From our theoretical study of the scattering by a trough on a conducting surface, it is found that periodical sharp dips in the scattering return occur as one sweeps the operation frequency, and the first dip frequency corresponds to the crack depth. Based on this observation, corelation curves between the first dip frequency and the crack depth have been made. In order to check the validity of our algorithm, test measurement has been made at microwave frequency range. Gating process in the time domain has been utilized to isolate the desired scattering return from the crack model on a finite conducting metal surface. Thus processed scattering returns exhibit a similar frequency dip as predicted theoretically. By our method, one can estimate the depth of a crack within 3 percent error.

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