Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)
- Volume 10 Issue 1
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- Pages.47-55
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- 1990
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- 1225-7842(pISSN)
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- 2287-402X(eISSN)
A Study of Measurement of In-plane Displacement by CW Laser Speckle Photography and Image Processing
연속파 레이저 스페클 사진법(寫眞法)과 화상처리(畵像處理)에 의한 면내섭위(面內燮位) 측정(測定)에 관한 연구(硏究)
Abstract
This paper presents experimental results which explore the capability of a CW laser speckle photography for tile measurement of in-plane displacement at high temperature. The serious restrictions on the application of the method seem to be the ambient air turbulence and the change of surface texture caused by the oxidation, as they tend to decorrelate the double exposured speckle patterns. In order to assess only the effect of air turbulence, a ceramics-coated stainless steel plate is heated in air and Ar-laser specklegrams are made with combination of temperature and lateral translation displacement. The slight reduction in visibility of Young's fringes is observed at
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