Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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A study on the Relationship between the Size of Defect and the Intensity of Eddy Current Signal in Heat Exchanging Tube made of STS 304.

Stainless강(鋼) 전열관(傳熱管)에 있어서 과전류(過電流) 신호강도(信號强度)와 결함(缺陷)크기와의 관계에 관한 연구(硏究)

  • 한응교 (한양대학교 정밀기계공학과) ;
  • 엄호섭 (한양대학교 대학원 정밀기계공학과) ;
  • 박익근 (한양대학교 대학원 정밀기계공학과) ;
  • 최명식 (한국 에너지 연구소)
  • Published : 1987.04.30
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Abstract

Eddy Current Examination is expected as the effective technique for nondestructive inspection of steam generator and various kinds of heat exchanging tubes made of STS - 304. In Case of E. C. T, a study on the various factors which have an effect on coil impedance is very important to the sensitivity of defect detection and the ratio of signal to noise. Therefore, this study analyzed coil impedance by means of the variational principle, the minimized theory of energy functional and the application of Finite Element Method. Really by using E. C. T, the relationship between the size of defects and the intensity of Eddy Current Signals can be obtained. Signal intensity becomes maximum at certain frequency. This frequency is affected by the characteristics and the position of signal sources.

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