Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- Mathematical model and design of a CMOS-MEMS infrared thermopile(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2010-12-01) Martínez Torteya, Antonio; MARTINEZ TORTEYA, ANTONIO; 297242; Dieck Assad, Graciano; Martínez Chapa, Sergio Omar; Camacho León, Sergio; Tecnológico de Monterrey, Campus Monterrey; Castañón Ávila, Gerardo AntonioThe development of a non-invasive technique to measure blood glucose concentration has led to numerous research efforts. Pulse Glucometry, a novel technique based on differential near infrared radiation absorption spectroscopy, has shown promising results in achieving this goal. However, in order for this technique to have a direct impact in the diabetic population, it must be implemented in a portable device. Because of this, the development of an infrared micro sensor, among other devices, is needed. Thermopiles have several advantages for working as infrared sensors and have already been used for applications in environmental monitoring and biomedical diagnostics. When designing thermopiles, it is of great importance to acknowledge the changes in the output voltage that the varying of each design variable may generate. This thesis has developed an accurate mathematical model for a thermopile with a bridge or cantilever structure, with a maximum error of 4.69% when compared with a finite element analysis simulation. The parameters that govern the behavior of the sensor were classified as fabrication process, material and design dependent parameters. Using the proposed analytical model, several analyses were made in order to find parameter-specific design optimization rules. The most relevant results were found for the design dependent parameters, the ones with the most ease of handling. It was shown for a previously fabricated thermopile, that by applying the proposed design optimization rules, the sensitivity would increase by a factor of 28. It was also shown that a thermopile with an area 147 times smaller could be fabricated without any loss of sensitivity. This thesis also presents a viable step by step fabrication process for such device. The process is divided in two stages a fabrications process compatible with the ones used in the integrated circuits industry and a post-processing stage for depositing materials not used in the first process and releasing the structure. Future work concerning this thesis is mainly focused in the integration of this device with a diffraction system and an infrared radiation source.
- Diseño de un sistema de control mioeléctrico manos libres en tecnología CMOS para el encendido automático de una electrolaringe(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2007-02-01) Pineda Rico, Zaira; Pineda Rico, Zaira; 179372; Dieck Assad, Graciano; ITESM-Campus MonterreyEn los últimos años las señales electromiográficas han sido ampliamente utilizadas como señales de control en el diseño de prótesis de brazos y piernas. Sabiendo que la electrolaringe es una prótesis de voz usada por más de la mitad de personas que sufren una laringotomía [2] y que se caracteriza por ser un dispositivo de encendido manual, en este trabajo se propone la implementación de un sistema de automatización manos libres. El sistema utiliza circuitos con capacitores conmutados para su fabricación en tecnología CMOS. El diseño del sistema se divide en dos etapas: la etapa de adquisición y acondicionamiento de la señal electromiográfica y la etapa de control de la electrolaringe. Para la etapa de control se propone el uso de dos alternativas confiables: un microcontrolador y un FPGA (Field Programmable Gate Array). Cada una de las etapas del sistema de adquisición y acondicionamiento fue simulada con la plataforma ICStudio de Mentor Graphics. El sistema de control fue simulado para ambas alternativas usando el software de BASCOM-AVR de Atmel y ModelSim SE de Mentor Graphics, respectivamente. El sistema completo propone un diseño sencillo, considerando los retos que representa el diseño de sistemas portátiles miniaturizados, con la finalidad de hacer de éste un producto disponible en el mercado capaz de brindar comodidad de uso y confiabilidad a los pacientes.