Refractive and geometric lens characterization through multi-wavelength digital speckle pattern interferometry
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Data
2008-03-01
Autores
Barbosa, Eduardo A. [UNESP]
dos Santos, Silas C. [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Resumo
Physical parameters of different types of lenses were measured through digital speckle pattern interferometry (DSPI) using a multimode diode laser as light source. When such lasers emit two or more longitudinal modes simultaneously the speckle image of an object appears covered of contour fringes. By performing the quantitative fringe evaluation the radii of curvature as well as the refractive indexes of the lenses were determined. The fringe quantitative evaluation was carried out through the four- and the eight-stepping techniques and the branch-cut method was employed for phase unwrapping. With all these parameters the focal length was calculated. This whole-field multi-wavelength method does enable the characterization of spherical and aspherical lenses and of positive and negative ones as well. (C) 2007 Elsevier B.V. All rights reserved.
Descrição
Palavras-chave
speckle, DSPL synthetic wavelength, lens measurement
Como citar
Optics Communications. Amsterdam: Elsevier B.V., v. 281, n. 5, p. 1022-1029, 2008.