Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Determining the Refractive Index Distribution of an Optical Component Using Transmission Deflectometry with Liquids

액체와 투과형 편향법을 이용한 광학부품의 굴절률 분포 측정

  • Received : 2014.08.29
  • Accepted : 2014.11.07
  • Published : 2014.12.25
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Abstract

Phase-measuring deflectometry is a full-field gradient measuring technique that lends itself very well to testing specular optical surfaces. We have measured the deformation of the surface of a lens by transmission deflectometry with liquids. In this study, a method is proposed for measuring the refractive index distribution of a transparent object component. The proposed method combines transmission deflectometry with liquids. The deformed fringe patterns of a sample immersed in different fluids are recorded, and then the three-dimensional phase information of the sample is reconstructed numerically. We have used phase-shifting and temporal phase-unwrapping methods to retrieve the phase from the measured deformed fringe pattern, and we have used a least-squares method to find the height information of the specular surface from the calculated slope. In particular, we have proposed a theoretical model for determining the refractive index of sample and planar convex lens are demonstrated experimentally.

액체 속에 담긴 시료를 투과형 편향법을 이용하여 3차원 형상을 측정하고 시료의 굴절률 분포를 측정하였다. 편향법은 면적이 비교적 크고 거울과 같이 산란이 거의 없는 물체의 3차원 측정을 하는데 유용하다. 편향법을 통해 얻은 왜곡 무늬로부터 위상과 기울기를 구하기 위해 위상이동법과 시간추적 위상펼침 (TPU:Temporal Phase Unwrapping) 방법을 이용하였고, 구한 기울기로부터 높이를 구하기 위해 최소자승법을 이용하였다. 굴절률 분포 측정을 위해 2개의 유체를 이용하였다. 전산기 시늉과 실험결과 액체를 이용한 투과형 편향법을 이용하여 시료내의 굴절률 분포를 측정 할 수 있음을 확인하였다.

Keywords

References

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