Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Study on Non-contact Detection of Surface Cracks of the Metals Using an Open-Ended Coaxial Line Sensor at X-band

마이크로파 X-밴드에서의 종단 개방 동축선 센서를 이용한 금속표면균열의 비접촉 검출 연구

  • 양승환 (한국표준과학연구원 안전측정센터) ;
  • 김동석 (한국표준과학연구원 안전측정센터) ;
  • 김기복 (한국표준과학연구원 안전측정센터) ;
  • 김종헌 (광운대학교) ;
  • 강진섭 (한국표준과학연구원 전자파센터)
  • Received : 2012.01.27
  • Accepted : 2012.04.13
  • Published : 2012.04.30
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Abstract

In this paper, a non-contact microwave technique was presented to detect the surface crack of the metals. An open-ended coaxial cable line was used as a sensor at 11 GHz, and the reflection coefficients were measured by scanning along the metal surface including artificial surface cracks. A parameter, the K value which was defined as the difference between maximum and minimum reflection coefficients, was measured and used to estimate the crack depth. A linear relationship between the K value and crack depth was found. This study showed that non-contact detection of the surface cracks of metals is possible using the open-ended coaxial line sensor at X-band.

본 연구는 금속의 표면균열 검출을 위해 마이크로파를 이용한 비파괴측정에 관한 것이다. X-band 대역인 11 GHz 주파수와 종단 개방 동축선 센서를 이용하여 금속 표면에 주사된 마이크로파의 반사계수를 측정하여 균열 여부 및 균열의 폭을 판단하게 된다. 또한 반사계수의 최대값과 최소값의 차이를 매개변수(K)로 하여 균열의 깊이를 평가하였는데 K값과 균열의 깊이는 선형 관계를 보였다. 따라서 본 연구는 종단 개방 동축선 센서를 이용한 비접촉식 금속표면균열 평가의 가능성을 보여주었다.

Keywords

References

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