Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Detection of Internal defects of a laminated plate using holographic interferometry

홀로그래피 간섭법을 이용한 층상평행판의 내부결함 탐상

  • 김달우 (포항산업과학연구원 계측연구원) ;
  • 한용규 (포항산업과학연구원 계측연구원)
  • Published : 1998.10.01
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Abstract

A laminated plate which contains debonds is visualized and evaluated nondestructively by holographic interferometry. Characteristic vibration frequencies of the plate are found in which debonds appear as anomalies in the fringe pattern for realtime holography. A set of time-average holograms for the vibrating plate are generated at various positions using a piezoelectric transducer, and the anomalies in each reconstructed hologram are enhanced through image processing. The images are added together to show the distribution of debonds for the whole area of the test plate.

층상평행판의 접착불량을 홀로그래피 간섭법을 이용하여 가시화함으로써 내부결함을 비파괴 탐상하였다. PZT로 측정 대상을 진동시키면서 실시간 홀로그래피 방법으로 접착불량의 특징이 간섭 무늬에 이상무늬로 나타나는 특성주파수를 찾고, PZT의 위치를 변화시키며 시간평균법으로 홀로그램을 구하였다. 재생된 상에서 결함 부분을 영상처리한 후 이들을 합성하여 층상평행판의 전체 면적에 걸친 내부결함 분포를 구하였다.

Keywords

References

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