Examinando por Materia "MATLAB"
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Ítem Control difuso aplicado a un vehículo aéreo no tripulado(Universidad EAFIT, 2012) Zambrano Caviedes, Juan Nepomuceno; Vélez Sánchez, Carlos MarioEn el trabajo se diseñan e implementan a través de simulación, utilizando el toolbox MATLAB/SIMULINK, una serie de controladores difusos tipo Mandani para el control de un mini-helicóptero robot tipo XCell. -- Para el diseño de dichos controladores se estudió inicialmente el modelo matemático del mini-helicóptero, disponible en el proyecto Colibrí, luego se hizo lo propio con los controles PID diseñados en al marco de dicho proyecto de investigación y se realizó una revisión bibliográfica de la literatura disponible para determinar los avances y el estado del arte en el tema de la tesis -- Posteriormente se diseñaron controles difusos a partir de los controles PID existentes, utilizando la metodología propuesta por alguno de los autores consultados en la revisión bibliográfica. Igualmente, se hubiera podido utilizar cualquier otro método de diseño, ya que existen varios disponibles en la literatura consultada. Se utilizó esta metodología debido a que era la que más se adaptaba al entorno de trabajo que se presentó en el momento, dado que el autor no es experto en vuelo de aeronavesÍtem Control multifrecuencia en tiempo real(Universidad EAFIT, 2003) Vélez Sánchez, Carlos Mario; Universidad EAFITÍtem Digital opties tool for multi-purpose experimental applications(2010-01-01) Sierra-Sosa, D.-E.; Angel-Toro, L.; Universidad EAFIT. Departamento de Ciencias Básicas; Óptica AplicadaThis work presents the results concerning the application of a Discrete Fresnel Transform algorithm (DFT), which was upgraded for modeling and experimenting with scalar diffraction fields, whose characteristics are analyzed. The MATLAB® software environment was used to implement this algorithm, which allows the user to set the initial conditions, corresponding to the optical information at the input plane, by using a graphic friendly user interface (GUI). Then, by using the DFT algorithm, light propagation from the input to the output plane is achieved. The outputs of the algorithm are the maps corresponding to the 2-D distributions amplitude and phase-modulo 2p, or equivalently, the corresponding real and imaginary parts of the complex analytical field. Also, to assist the analysis, line profiles for these maps are provided. Results allow the user synthesizing Fresnel diffraction in presence of multiple components, like lenses, prisms, diffractive gratings, and holographic elements. Indeed, by implementing a series of successive steps, applications like image forming and spatial filtering can be demonstrated. The basis of the algorithm's architecture and some typical results, which closely resemble those from the experiments, are presented.Ítem Shack-Hartmann spot dislocation map determination using an optical flow method(OPTICAL SOC AMER, 2014-01-27) Vargas, J.; Restrepo, R.; Belenguer, T.; Universidad EAFIT. Departamento de Ciencias Básicas; Óptica AplicadaWe present a robust, dense, and accurate Shack-Hartmann spot dislocation map determination method based on a regularized optical flow algorithm that does not require obtaining the spot centroids. The method is capable to measure in presence of strong noise, background illumination and spot modulating signals, which are typical limiting factors of traditional centroid detection algorithms. Moreover, the proposed approach is able to face cases where some of the reference beam spots have not a corresponding one in the distorted Hartmann diagram, and it can expand the dynamic range of the Shack-Hartmann sensor unwrapping the obtained dense dislocation maps. We have tested the algorithm with both simulations and experimental data obtaining satisfactory results. A complete MATLAB package that can reproduce all the results can be downloaded from [http://goo.gl/XbZVOr]. © 2014 Optical Society of America.Ítem Understanding the physical optics phenomena by using a digital application for light propagation(IOP PUBLISHING LTD, 2011-01-01) Sierra-Sosa, D.-E.; Ángel-Toro, L.; Universidad EAFIT. Departamento de Ciencias Básicas; Óptica AplicadaUnderstanding the light propagation on the basis of the Huygens-Fresnel principle stands for a fundamental factor for deeper comprehension of different physical optics related phenomena like diffraction, self-imaging, image formation, Fourier analysis and spatial filtering. This constitutes the physical approach of the Fourier optics whose principles and applications have been developed since the 1950's. Both for analytical and digital applications purposes, light propagation can be formulated in terms of the Fresnel Integral Transform. In this work, a digital optics application based on the implementation of the Discrete Fresnel Transform (DFT), and addressed to serve as a tool for applications in didactics of optics is presented. This tool allows, at a basic and intermediate learning level, exercising with the identification of basic phenomena, and observing changes associated with modifications of physical parameters. This is achieved by using a friendly graphic user interface (GUI). It also assists the user in the development of his capacity for abstracting and predicting the characteristics of more complicated phenomena. At an upper level of learning, the application could be used to favor a deeper comprehension of involved physics and models, and experimenting with new models and configurations. To achieve this, two characteristics of the didactic tool were taken into account when designing it. First, all physical operations, ranging from simple diffraction experiments to digital holography and interferometry, were developed on the basis of the more fundamental concept of light propagation. Second, the algorithm was conceived to be easily upgradable due its modular architecture based in MATLAB® software environment. Typical results are presented and briefly discussed in connection with didactics of optics.