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http://dx.doi.org/10.3807/KJOP.2014.25.6.326

Determining the Refractive Index Distribution of an Optical Component Using Transmission Deflectometry with Liquids  

Shin, Sanghoon (KPS)
Yu, Younghun (Department of Physics, Cheju National University)
Publication Information
Korean Journal of Optics and Photonics / v.25, no.6, 2014 , pp. 326-333 More about this Journal
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.
Keywords
Deflectometry; Phase measuring deflectometry; Temporal phase unwrapping;
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