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Determining the Refractive Index Distribution of an Optical Component Using Transmission Deflectometry with Liquids
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 Title & Authors
Determining the Refractive Index Distribution of an Optical Component Using Transmission Deflectometry with Liquids
Shin, Sanghoon; Yu, Younghun;
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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.
 Keywords
Deflectometry;Phase measuring deflectometry;Temporal phase unwrapping;
 Language
Korean
 Cited by
1.
A Study of Three-Dimensional Measurement By Transmission Deflectometry and Hilbert Transform, Korean Journal of Optics and Photonics, 2016, 27, 2, 61  crossref(new windwow)
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