Medición del perfil de la cara convexa de una lente de contacto dura mediante el método de proyección de una línea de luz

dc.contributorMejía, Yobani
dc.contributorOptica Aplicada - UN
dc.creatorBenavides Lara, Juliana Patricia
dc.date.accessioned2021-10-07T14:38:04Z
dc.date.available2021-10-07T14:38:04Z
dc.date.created2021-10-07T14:38:04Z
dc.date.issued2021-09-09
dc.identifierhttps://repositorio.unal.edu.co/handle/unal/80410
dc.identifierUniversidad Nacional de Colombia
dc.identifierRepositorio Institucional Universidad Nacional de Colombia
dc.identifierhttps://repositorio.unal.edu.co/
dc.description.abstractEn el presente trabajo se propone implementar un método geométrico que permita realizar mediciones topográficas de superficies similares a las lentes de contacto. Para esto, se exploró e implementó el método de triangulación con la proyección de una franja de luz blanca proveniente de una lámpara de hendidura, la cual es comúnmente utilizada en optometría. La franja es registrada mediante un sistema óptico que está ubicado a un ángulo definido con respecto a la dirección de incidencia de la luz y por consiguiente posee una geometría que permite utilizar el principio de triangulación para la medición de cambios en la altura sobre la superficie y posteriormente reconstruirla. Se aplicó el método para la medición de tres moldes de polimetilmetacrilato (PMMA) con diferente radio de curvatura obteniendo resultados consistentes con los valores nominales dados por el fabricante. Adicionalmente, se implementaron dos configuraciones con ángulos de triangulación distintos en donde se identificó que al incrementar el ángulo hay una mejora en la resolución de la medición. Finalmente, los resultados obtenidos por medio de esta técnica se compararon con mediciones realizadas con un topógrafo basado en la prueba de Hartmann encontrando que es un método prometedor para ser usado como complemento en la inspección de superficies. (Texto tomado de la fuente).
dc.description.abstractHereby I propose the implementation of a geometric method that enables the topographic measurement of contact lens-like surfaces. For this purpose, I explored and implemented the triangulation method with the projection of a fringe of light generated by a slit lamp, which is commonly used in optometry. The fringe is registered by an optic system located at a given angle with respect to the incidence direction of the light and hence, the resulting geometry allows the implementation of the triangulation principle for the measurement of height changes over the surface and its subsequent reconstruction. I applied the method for the measurement of three Poly(methyl methacrylate) (PMMA) molds with different radius of curvature and obtained results that were consistent with the nominal values provided by the manufacturer. In addition, I implemented two setups with different triangulation angles in which I observed an improvement in the measurement resolution as the angle was increased. Finally, the results obtained by means of this method were compared to the measurements performed with a topographer based on the Hartmann test, finding that the former is a promising complementary method in surfaces inspection.
dc.languagespa
dc.publisherUniversidad Nacional de Colombia
dc.publisherBogotá - Ciencias - Maestría en Ciencias - Física
dc.publisherDepartamento de Física
dc.publisherFacultad de Ciencias
dc.publisherBogotá, Colombia
dc.publisherUniversidad Nacional de Colombia - Sede Bogotá
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dc.rightsAtribución-NoComercial-CompartirIgual 4.0 Internacional
dc.rightshttp://creativecommons.org/licenses/by-nc-sa/4.0/
dc.rightsinfo:eu-repo/semantics/openAccess
dc.titleMedición del perfil de la cara convexa de una lente de contacto dura mediante el método de proyección de una línea de luz
dc.typeTrabajo de grado - Maestría


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