Examinando por Autor "Angel, Luciano"
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Ítem Application software for teaching the polarization ellipse(Sociedad Espanola de Optica, 2018-09-01) Cano, Camilo; Echeverri-Chacon, Santiago; Cuartas-Velez, Carlos; Angel, Luciano; Restrepo, Rene; Universidad EAFIT. Departamento de Ciencias Básicas; Óptica AplicadaThis paper describes the development of a computational application that calculates the configuration of a polarization state generator, according to the parameters of a desired polarization ellipse. The most general way to describe the polarization state of light is an ellipse, however, it is rarely used in practical courses in which applications are limited to the case of linear or circular polarization. To generate a desired polarization ellipse, a polarizer and a pair of retarders of ?/2 and ?/4 can be used, the problem is to determine the angle of rotation of the retarders. We present an open source algorithm to calculate these angles by using a minimization method applied to the Jones calculus description of polarizing elements. This development aims to help research and education activities to promote a more practical understanding of the polarimetric properties of light. © Sociedad Española de óptica.En este trabajo se presenta el desarrollo de una aplicación computacional que permite determinar la configuración de un generador de estados de polarización en función de los parámetros de una elipse de polarización deseada. La manera más general de describir la polarización de la luz es una elipse, sin embargo, este estado rara vez se aborda en un curso práctico en los cuales las aplicaciones se limitan al caso de la polarización lineal o circular. Para generar una elipse de polarización deseada se puede utilizar un polarizador y un par de retardadores de ?/2 y ?/4, el problema está en determinar a qué ángulo deben estar ubicados los retardadores. Se presenta un algoritmo de acceso libre que calcula estos ángulos mediante un método de minimización aplicado al cálculo de Jones. Este desarrollo va dirigido a actividades de investigación y educación, para promover una comprensión práctica de las propiedades polarimétricas de la luz. © Sociedad Española de óptica.Ítem Multiple rotation assessment through isothetic fringes in speckle photography(OPTICAL SOC AMER, 2007-05-10) Angel, Luciano; Tebaldi, Myrian; Bolognini, Nestor; Universidad EAFIT. Departamento de Ciencias Básicas; Óptica AplicadaThe use of different pupils for storing each speckled image in speckle photography is employed to determine multiple in-plane rotations. The method consists of recording a four-exposure specklegram where the rotations are done between exposures. This specklegram is then optically processed in a whole field approach rendering isothetic fringes, which give detailed information about the multiple rotations. It is experimentally demonstrated that the proposed arrangement permits the depiction of six isothetics in order to measure either six different angles or three nonparallel components for two local general in-plane displacements. © 2007 Optical Society of America.Ítem Multiple-aperture speckle method applied to local displacement measurements(ELSEVIER SCIENCE BV, 2007-06-01) Angel, Luciano; Tebaldi, Myrian; Bolognini, Nestor; Universidad EAFIT. Departamento de Ciencias Básicas; Óptica AplicadaThe goal of this work is to analyze the measurement capability of the modified speckle photography technique that uses different multiple aperture pupils in a multiple exposure scheme. In particular, the rotation case is considered. A point-wise analysis procedure is utilized to obtain the fringes required to access to the local displacement measurements. The proposed arrangement allows simultaneous displaying in the Fourier plane several fringes system each one associated with different rotations. We experimentally verified that the local displacement measurements can be determined with a high precision and accuracy. © 2007 Elsevier B.V. All rights reserved.Ítem Understanding the Physical Optics Phenomena by Using a Digital Application for Light Propagation(2011-02-01) Angel, Luciano; Universidad EAFIT. Departamento de Ciencias Básicas; Óptica AplicadaÍtem Vortex Metrology by using Fourier Analysis Techniques: Vortex Networks Correlation Fringes(OPTICAL SOC AMER, 2012-10-01) Angel, Luciano; Universidad EAFIT. Departamento de Ciencias Básicas; Óptica Aplicada