Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Quantitative Comparison of Out-of-Plane Deformation Measured by Dual-Function Interferometer System

이중기능 간섭계에 의해 측정된 면외변형의 정략적 비교

  • 김경석 (조선대학교 기계설계공학과) ;
  • 장호섭 (조선대학교 산학협력단 레이저센터) ;
  • 이승석 (한국표준과학연구원 안전그룹) ;
  • 정현철 (조선대학교 기계설계공학과) ;
  • 곽재호 (조선대학교 대학원 기계설계공학과)
  • Published : 2008.02.28
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Abstract

Dual-function interferometer is an interferometer that has all features of ESPI (electronic speckle pattern interferometry) and shearography in one interferometer setup. The deformatiou of an object is directly obtained by ESPI while the slope of the deformation of an object is obtained by shearography. If the result of shearography is divided by shearing amount and integrated by numerical analyzing, then finally the reconstructed deformation of an object that is the same as the results directly obtained by ESPI can be measured by shearography. In this study, rubber and alruminum plates are used as specimen and its out-of-plane deformation is measured by ESPI and shearography setup of the dual-function interferometer. Each of the results obtained by ESPI and shearography is compared by using numerical integration to the result of shearography. From this study, it is confirmed that the reconstructed deformation results obtained by numerical integration good agree with the results obtained by ESPI.

이중기능 간섭계는 ESPI와 전단간섭계의 모든 기능이 하나의 간섭계로 구성되어 있다. ESPI는 대상물의 변형을 측정하고 전단간섭계는 대상물의 변형의 기울기를 측정한다. 제안된 전단간섭법은 전단간섭계의 결과를 평행이동시킨 화소수로 나누고, 적분하면 원래의 변형과 거의 같은 결과를 얻을 수 있는데 이를 ESPI의 결과와 비교하였다. 본 연구에서는 고무판과 알루미늄 시험편을 이용하여 이중기능간섭계로 동시에 두 기법의 면외변형 결과를 측정하여 비교하였다. 이중기능간섭계는 동일한 한번의 변형에 두 가지의 결과를 동시 측정함으로써 두 기법의 정확한 비교가 가능하였다. 본 연구에서는 제안된 전단간섭법과 ESPI의 결과를 이중기능 간섭계를 이용하여 정량계측하여 만족한 결과를 도출하였다.

Keywords

References

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