비파괴검사학회지 (Journal of the Korean Society for Nondestructive Testing)

  • 제28권5호
  • /
  • Pages.416-420
  • /
  • 2008
  • /
  • 1225-7842(pISSN)
  • /
  • 2287-402X(eISSN)
한국비파괴검사학회 (The Korean Society for Nondestructive Testing)
권호 표지

실린더형 구조물의 원거리 초음파검사용 나선형 코일 자왜 스트립 변환기

Spiral Coil Magnetostrictive Strip Transducers for Long Range Ultrasonic Testing of Cylindrical Structures

  • 발행 : 2008.10.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

전자기음향변환기 분야에서는 나선형 RF 코일이 솔레노이드 코일보다 훨씬 널리 사용되고 있다. 그러나 실린더 구조물의 원거리 초음파검사용 자왜 스트립 도파변환기 분야에서는 솔레노이드 코일이 주로 사용되어왔다. 이는 아마도 낮은 주파수의(즉, 치수가 큰) 나선형 코일의 제작의 어려움에 기인하는 것 같다. 본 논문에서는 FFC(flexible flat cable)로 나선형 코일 자왜 스트립 도파변환기를 제작하는 방법을 기술한다. 기존의 솔레노이드 코일 변환기와의 비교실험을 통하여 나선형 코일 변환기가 훨씬 우수한 성능(감도, 신호-대-잡음 비, 도파방향조정능력)을 갖는다는 것을 실증한다.

In EMAT field, spiral RF coils are much more widely used when compared with solenoid coils. In the field of the magnetostrictive strip transducers for long range ultrasonic testing of cylindrical structures, however, solenoid coils has been used. This seems to be attributed to the difficulty in fabricating low frequency (i.e., large size) spiral coils. In this paper, we describe a method for fabricating spiral coil magnetostrictive strip guided wave transducers from FFC (flexible flat cable). It is demonstrated through a comparison experiment that the spiral coil transducer has much superior performance (sensitivity, SNR, and guided wave direction control capability) than the previous transducer with solenoid coils.

키워드

참고문헌

  1. http://www.imperial.ac.uk/ndt
  2. http://www.guided-ultrasonics.com
  3. http://www.ndttech.swri.org
  4. H. Kwun, S. Y. Kim and G. Light, 'Long range guided wave inspection of structures using the magnetostrictive sensor,' J. Korean Soc. NDT. Vol. 21, No. 4, pp. 383-390, (2001)
  5. H. Kwun and C. M. Teller, 'Magnetostrictive generation and detection of longitudinal, torsional, and flexural waves in a steel rod,' Mat. Eval. Vol. 52, No. 4, pp. 503-507, (1994)
  6. H. Kwun, S. Y. Kim and M. S. Choi, 'Experimental comparison of analytical modeling of a guided wave interaction with a notch in a pipe,' J. Korean Phys. Soc. Vol. 45, No. 2, pp. 380-385, (2004)
  7. H. Kwun and A. E. Holt, 'Feasibility of under-lagging corrosion detection in steel pipe using the magnetostrictive sensor technique,' NDT&E International Vol. 28, Issue 4, pp. 211-214, (1995) https://doi.org/10.1016/0963-8695(95)00019-T
  8. S. J. Kim and M. S. Choi, 'Magnetic property effects of the strip on transducer sensitivity in a magnetostrictive strip type guided wave transducers,' J. Korean Soc. NDT. Vol. 28, No. 2, pp. 205-210, (2008)
  9. http://www.mkckorea.com
  10. M. Hirao and H. Ogi, EMATs for Science and Industry, Ch. 2, Kluwer Academic, (2003)
  11. http://www.eunsung-ind.com
  12. G. M. Light, H. Kwun, S. Y. Kim and R. L. Spinks, 'Method and apparatus for short term inspection or long term structural health monitoring,' U.S. Patent No. 6396262, (2002)
  13. M. G. Silk, Ultrasonic Transducers for Nondestructive Testing, Ch. 5, Adam Hilger, (1984)
  14. http://www.dooyoun.com