Repositorio Institucional de CIO (Centro de Investigaciones en Optica)
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1060 research outputs found
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DESARROLLO Y VALIDACIÓN DE UN ARREGLO HOLOGRÁFICO DIGITAL A PARTIR DE RESULTADOS PRELIMINARES DEL FENÓMENO DE LENTE TÉRMICA
Full text link"El fenómeno de lente térmica, generado por gradientes térmicos en medios líquidos, fue utilizado como modelo experimental en este estudio. Mediante un sistema holográfico basado en un interferómetro Mach-Zehnder, se capturaron hologramas digitales empleando un láser de 532 nm para la excitación térmica y otro de 632 nm para la captura. La holografía digital permitió registrar cambios de fase asociados a variaciones del índice de refracción, destacándose como una técnica no invasiva y precisa. Los resultados validan este sistema para aplicaciones futuras en caracterización óptica.
IMPLEMENTATION OF ALTERNATIVE ORGANIC ANODES BASED ON PROCESSABLE GRAPHENE DERIVATIVES AND APPLIED TO SOLAR CELLS
Full text link"Low-cost and semi-transparent alternative anodes are presented for potential application in organic solar cells (OSCs). Graphene derivatives, SPGSW (solution-processed graphene suspended in water) and PGD (processable graphene derivative), were mechanically synthesized and employed as alternative anodes in two setups: three-layer graphene anode (TLGA) and hybrid multilayer graphene anode (HMGA). Both anodes exhibited promising transmittance (T) and electrical resistance (R) parameters, and these anodes were implemented in PM6:Y7-based OSCs, preliminary results showed an acceptable power conversion efficiencies (PCE). These results highlight the potential of these graphene derivatives as alternative anodes.
TÉCNICAS DE SPECKLE EN LA ESPECTROSCOPÍA
Full text link"La interferometría estacionaria de speckle de sensibilidad de fase para la detección de cambios de longitud de onda en la escala femtométrica depende de las diferencias de trayectoria óptica (OPD, por sus iniciales en inglés de “Optical Path Difference”) producidas por las múltiples reflexiones dentro de una esfera integradora (IS, por su iniciales en inglés de “Integrating Sphere”). En este trabajo de tesis, las OPD se calculan utilizando un programa de trazo de rayos de una esfera de vidrio recubierta con pintura blanca.
PRECISION AGRICULTURE WITH VISION SYSTEMS
Full text link"This document presents a low-cost, open-source, robust, and user-friendly Unmanned Aerial System for precision agriculture tasks. The proposed methodology for data collection and image processing is flexible and adaptable to most basic systems. Besides, a new vegetation index is defined for temperature estimation on vegetation without thermal imagery as usually done by other related systems. The system also features a control algorithm that is robust against external disturbances. The output information is used then to estimate the vegetation's temperature. The experiments presented in this work are enclosed to corn fields.
ASISTENTE VIRTUAL CON REALIDAD AUMENTADA PARA RECORRIDOS TURÍSTICOS PARA LA ZONA CENTRO DEL ESTADO DE AGUASCALIENTES
Full text link"Este proyecto fusiona inteligencia artificial y realidad aumentada para crear un asistente virtual que enriquece la experiencia turística en Aguascalientes. Busca ofrecer recorridos únicos y accesibles mediante una aplicación portátil con chatbot, desarrollado en dos fases: una enfoque general y otra destacando el chatbot. La metodología abarca análisis de realidad aumentada, creación del asistente virtual y del chatbot. Este último presenta interacción amigable gracias a componentes de voz a texto y texto a voz, brindando información sobre lugares turísticos y negocios locales en la ciudad.
SISTEMA MECATRÓNICO PARA LA MEDICIÓN DE ÁNGULO DE BREWSTER Y ABELES-BREWSTER
Full text link"Desarrollo de un sistema opto-mecatrónico theta-2theta, el cual realiza mediciones de ángulo de Brewster y Abelès-Brewster para obtener la caracterización de materiales transparentes y películas delgadas dieléctricas.
COORDINATED CONTROL OF A 6-DOF ROBOTIC MANIPULATOR EMPLOYING VIRTUAL MODELS OF ITS ACTUATORS
Full text link"This study proposes a scheme that combines the model reference control with the internal model control to impose a first-order behavior on the speed control system of direct current motors. This scheme is used as the internal loop to control the position of a model to use it as the reference for the physical motor.
This work also presents an inverse kinematic solution for the UR5 and algorithms to choose angles that do not lead to singularities. These algorithms can be used in independent joint control schemes such as the one proposed in this document.
GRAPHENE OXIDE-BASED BIOSENSING SYSTEMS FOR THE ANALYSIS OF PATHOGEN-RELATED ANALYTES
Full text link"In this dissertation, a biosensing system targeting pathogen-related analytes was developed. The biosensing system comprises 96 microwell plates coated with graphene oxide, which performs as quencher of fluorescence from a specific immunoprobe. The fluorescence of the immunoprobes that do not experiment immunoreactions (antibody-antigen) are deactivated by graphene oxide via non-radiative energy transfer, whereas those immunoprobes undergoing immunoreactions preserve its photoluminescence due to the distance and the low affinity between the immunocomplex and the graphene oxide-coated surface. Additionally, based on the same biosensing strategy, it was developed a paper-based disposable test for bacterial vaginosis detection.
ENTANGLED TWO PHOTON STATE IN A HELICAL INCE-GAUSS BASIS
Full text link"We perform a change of basis of the photon-pair entangled state, generated by SPDC, and describe it in terms of Helical Ince-Gauss modes. We are able to describe how the probability detection of the state can be tuned with the ellipticity parameter of these modes. We also found that the state has two different Bell states, and it is possible to switch from one Bell state to another. We build a source of entangled photon pairs to tune the probability detection, and confirm the entanglement of the state with a Bell-type inequality test.
STUDY OF THE PROPAGATION OF ENTANGLED PHOTONS IN ORBITAL ANGULAR MOMENTUM WITH LAGUERRE AND INCE-GAUSS MODES THROUGH A TURBULENT ATMOSPHERE
Full text link"Atmospheric turbulence is a challenge in free space optical communication due to refractive index fluctuations from temperature variations. This research studies turbulence's impact on entangled photons with Orbital Angular Momentum using Laguerre and Helicoidal Ince Gauss modes. Entanglement is measured through concurrence using quantum state tomography. We extend Laguerre Gauss modes investigation with non-zero radial indices, an unexplored approach. We study concurrence of Helicoidal Ince-Gauss modes against turbulence, less researched before. Findings show higher cylindrical symmetry modes better preserve entanglement against turbulence scintillation, crucial for free space optical communication protocols relying on entanglement preservation.