Dra. Beatriz Cruz Muñoz - Academia.edu (original) (raw)
Papers by Dra. Beatriz Cruz Muñoz
Journal of Physics: Conference Series, 2019
By mean of mechanical alloying the synthesis of Bi 0.4 Sr 0.6 FeO 3–δ ceramic powders were achiev... more By mean of mechanical alloying the synthesis of Bi 0.4 Sr 0.6 FeO 3–δ ceramic powders were achieved according to the stoichiometric relations of Bi 2 O 3, Fe 2 O 3 and SrCO 3 initial powders. Then thermal treatments in air both 800 °C as 825 °C as at function on time was carried out on the processed ceramic powders, which were posteriorly characterized via X-ray diffraction and thermogravimetric. Finally, uniaxial compaction of the chosen processed powders to 800 °C was performed adding polyvinyl alcohol (PVA) or butyral alcohol (PVB) try to find a higher porosity. The milled ceramic compound presented a single cubic phase with lattice parameters of 3.95Ȧ when it was thermally treated at 800 °C and only 30 min of thermal treatment. No change on lattice parameter was found with higher treatment time. Thermogravimetric analysis showed processed powder are stable to work at the operation temperature of the solid oxide fuel cell chosen. In regard to porosity, the results showed that an ...
Ingenieria y Universidad
We present the design, construction, and implementation of thin film deposition equipment based o... more We present the design, construction, and implementation of thin film deposition equipment based on the Sol/Gel dip-coating technique for the fabrication of coatings under controlled deposition conditions and working environment at ambient temperature and pressure. The deposition system includes a 304 stainless steel structure and a moving platform that holds the substrate and is transported along vertical axes at a deposition distance of up to 30 cm in height. The mechanical and electronic design was considered, using computer-aided development and dimensional validation (for the structure and the motion transmission system) and the programming of the system using the Arduino platform. The design focused on the deposition speed control for the functional equipment operations, whose operating principle is based on a PWM scheme, achieving an immersion/extraction speed parameter in ranges between 1.5 cm/s and 3.5 cm/s (with a resolution of ± 0.2 cm/s). The operation of the equipment an...
Se habló sobre la importancia no solo de emplear de energías no fósiles sino también de crear tec... more Se habló sobre la importancia no solo de emplear de energías no fósiles sino también de crear tecnología propia, es decir, crear empresa alrededor de estos temas para no depender de la tecnología importadaUniversidad Tecnológica de Pereir
Se discute sobre la importancia del apoyo económico gubernamental nacional e internacional para i... more Se discute sobre la importancia del apoyo económico gubernamental nacional e internacional para impulsar la investigación en ciencia básica y aplicada para en un futuro poder producir nuestra propia tecnología y no depender de tecnología extranjera. Lo cual generará no solo desarrollo a nuestros países latinoamericanos sino empleo, etc...Fondo sectorial CONACYT - SENE
Scientia et Technica, 2020
La técnica de Depósito Químico de Vapor Asistido por Aerosol (AACVD) es un proceso de atomización... more La técnica de Depósito Químico de Vapor Asistido por Aerosol (AACVD) es un proceso de atomización de la solución precursora, generando gotas que se envían por medio de un gas portador hacia la superficie del sustrato, formando una película delgada cuyas propiedades dependerán de variables como la velocidad de depósito, temperatura del sustrato, tamaño de la gota y número de capas. En éste trabajo se presentan los criterios de diseño mecánico, eléctrico y electrónico empleados para implementar la técnica. El prototipo consiste en una estructura metálica que soporta una placa calefactora y un porta-sustrato donde se ubica la muestra a recubrir; la placa es controlada con un microcontrolador de potencia para mantener constante la temperatura del sustrato. Además, se implementó un sistema de pulverización con un nebulizador ultrasónico 241TM y un sistema de calentamiento de aire con un horno en función rampa MC5438. La tobera de inyección del vapor es guiada por un motor a paso NEMA 17 ...
Optik, 2021
Abstract Nanorods of aluminum doped zinc oxide films (AZO) were grown on borosilicate glass subst... more Abstract Nanorods of aluminum doped zinc oxide films (AZO) were grown on borosilicate glass substrates using an rf-sputtering technique combining simultaneously substrate twisting motion frequency with sustained rotation. Twist-motion frequency of 0.35, 0.5, and, 0.75 Hz between 40° to -40° taking the horizontal plane as reference was adjusted. Effects of this twist-motion frequency as a function of the sustained azimuth rotation of the substrate at 15, 30, and 45 rpm were observed. The morphological, optical, and structural properties were compared between films. Well defined vertical nanorods shapes were observed. The thickness of the films is affected by both twist motion and rotation speed, and the average optical transmittance was greater than 80 % which shows that all samples have high transparencies in the visible range. The combination of these growth parameters of twist and rotation of the substrate allowed us to obtain refractive index values between 1.77 and 2.11 at a wavelength of 700 nm and an energy bandgap in the range of 3.47 and 3.63 eV. The crystallite size of the nanorods obtained was between 29 and 40 nm and the films showed a preferential orientation normal at the surface film to direction of the c-crystallographic plane (002). We report compressive stress in our samples.
We present the theoretical analysis using simulation of micromagnetic behavior in an iron thin fi... more We present the theoretical analysis using simulation of micromagnetic behavior in an iron thin film, through the software Object Oriented Micromagnetism Framework (OOMMF). The results are compared with data obtained by experimental for Fe films grown by Pulsed Laser Deposition (PLD) Magnetic measures were carried out through Magneto-Optic Kerr Effect (MOKE) revealing hard ferromagnetic behavior of the film at room temperature consistent with the simulations. The coercive field have an error of only 9% posibly due to considerations of temperatura. The magnetization diagrams and energy curves show the precense of multiple mechanism of magnetization in this system
Hyperfine Interactions, 2017
Fe 96−x Co x C 4 (x = 0, 10, 20, 30, 40 at. %) alloys were obtained by mechanical alloying of Fe,... more Fe 96−x Co x C 4 (x = 0, 10, 20, 30, 40 at. %) alloys were obtained by mechanical alloying of Fe, C and Co powders using high-energy milling. The structural and magnetic properties of the alloy system were analyzed by X-ray diffraction, Scanning Electron Microscopy (SEM), Vibrating Sample Magnetometer (VSM) and Mössbauer Spectrometry at room temperature. The X-ray diffraction patterns showed a BCC-FeCoC structure phase for all samples, as well as a lattice parameter that slightly decreases with Co content. The saturation magnetization and coercive field were analyzed as a function of Co content. The Mössbauer spectra were fitted with a hyperfine magnetic field distribution showing the ferromagnetic behavior and the disordered character of the samples. The mean hyperfine magnetic field remained nearly constant (358 T) with Co content.
Se presentan los criterios de diseno, construccion y los parametros de operacion de un contador p... more Se presentan los criterios de diseno, construccion y los parametros de operacion de un contador proporcional de flujo de gas para la implementacion de la tecnica de espectroscopia Mossbauer de electrones de conversion integral (ICEMS). El detector opera en conjunto con un sistema de deteccion multicanal y una fuente de radiacion γ de alta energia 57Co. Se utilizo como gas multiplicador un flujo constante de una mezcla 5% de CH4 en He, el cual aumento la intensidad de la senal y protegio la superficie de la muestra de descargas electricas. En el diseno se considero un filtro interior para rayos X de baja energia que favorecio la coleccion de datos, con lo cual se registro un menor ruido de fondo y se logro optimizar el volumen de gas consumido. Con este detector ICEMS construido se pueden caracterizar eficientemente las propiedades magneticas y estados de oxidacion (interacciones hiperfinas) tanto de materiales en volumen como en peliculas delgadas. La calibracion del dispositivo se ...
The design, construction and operation parameters of a gas flow proportional counter are presente... more The design, construction and operation parameters of a gas flow proportional counter are presented in order to implement the integral conversion electron mossbauer spectroscopy technique (ICEMS). The detector works with the support of a multi-channel detection system and a source of highenergy radiation of 57Co. A constant gas flow of a mixture of 5% CH4 in He was used as a multiplier gas, which increased the signal intensity, and protected the sample´s surface of electric shocks. An internal filter for low energy X-rays was considered during the design to achieve a lower background noise and optimize the volume of gas consumed. With this built-in ICEMS detector it is feasible to characterize efficiently the magnetic properties and oxidation states (hyperfine interactions) of both bulk materials and thin films. The calibration of the device was performed by using an iron sample synthesized by powder metallurgy. It was successfully identified the presence of a distinctive sextet of t...
In this work experimental analysis was carried out between incidence angle an Kerr signal intensi... more In this work experimental analysis was carried out between incidence angle an Kerr signal intensity, that influences in the hystereteresis shape behavior, which establishes a direct relationship between both for longitudinal configuration on the Kerr Magnetometer. The results show a better behavior of the curve for the defined range from 10° to 60° of incident angle.
Se realizo la sintesis de Fe-20at%Al por aleacion mecanica (AM) para diferentes frecuencias de os... more Se realizo la sintesis de Fe-20at%Al por aleacion mecanica (AM) para diferentes frecuencias de oscilacion y tiempo de molienda, en un mezclador MM400-Restch con relacion masa bolas-masa polvo 4:1. La caracterizacion estructural se realizo por difraccion de rayos X, y la caracterizacion magnetica mediante magnetometria de muestra vibrante y espectroscopia Mossbauer de transmision (MS) a temperatura ambiente. En la primera etapa se realizo la molienda a frecuencia variable (15-30Hz) para 6 horas de molienda sin la presencia de Agente Controlador del Proceso (PCA). El analisis de los difractogramas revelo que en 25Hz inicio el proceso de formacion de la fase α-Fe(Al). Debido a la adherencia presentada por los polvos en las paredes de los jarros, en la segunda etapa se utilizo etanol como PCA variando el tiempo de molienda entre 6 y 12 horas a 25Hz. Se hallo que el parametro de red, calculado a partir del refinamiento de los difractogramas, aumento con respecto al del α-Fe, siendo (0,28...
Is presented in this paper the experience of the authors, by which it has implemented a methodolo... more Is presented in this paper the experience of the authors, by which it has implemented a methodology that directed to ensure the quality of measurements performed in experimental practices of the physics lab courses aimed at basic training for engineering students from the Technological University of Pereira (UTP). To fulfill this objective, the students of the physics lab course were immersed into the context of national and international standards that exists around the issues and metrological vocabulary, and were introduced to the application of a generic methodology for the estimation of the measurement uncertainty of experimental results. This methodology has been designed and implemented with the goal of creating a culture around this topic. The methodology is based on the GUM "Guide to the Expression of Uncertainty in Measurement" published by ISO used in scientific, industrial and legal areas. This methodology has been designed and implemented with the goal of creat...
En nuestro pais la mayoria de los desarrollos e investigaciones que se realizan no cuentan con un... more En nuestro pais la mayoria de los desarrollos e investigaciones que se realizan no cuentan con un aseguramiento de la calidad de las mediciones, el cual implica como minimo la utilizacion de instrumentos calibrados que aseguren su trazabilidad. Unido a todo esto, la infraestructura de laboratorios de metrologia en nuestro pais no es la adecuada comparada con paises como Brasil o Mexico; todo lo anterior hizo que los miembros del grupo de electrofisiologia del departamento de fisica de la Universidad Tecnologica de Pereira, desde el ano 2000 iniciaran todo un proceso de capacitacion en temas metrologicos y normativos que condujo a la presentacion de proyectos de investigacion a COLCIENCIAS que tenian entre sus objetivos principales disponer de laboratorios de metrologia en las areas de calibracion de equipos de medidas electricas y equipo electro-medico, este objetivo se logro; en la actualidad se dispone de laboratorios de metrologia acreditados bajo la norma NTC-ISO/IEC – 17025, en...
We present a magnetometer Kerr ex situ (MEK), in conventional configuration, which operates under... more We present a magnetometer Kerr ex situ (MEK), in conventional configuration, which operates under normal ambient conditions in a range of 0.0 to 1000 mT ± 0.2%. This device is the result of the analysis of signals involved in this effect magneto-optic and study instrumental made to the types of MEK identified. Besides are describe the components that make up. To test the magnetometer, measurements were carried out on a sample of Permalloy (NiFe), a material that had been previously measured, with the magnetometer Kerr differential (DMOKE)of Solid State Group at the University of Antioquia.
En éste libro presentamos y compartimos la experiencia del Grupo GIMM de la UTP para el desarroll... more En éste libro presentamos y compartimos la experiencia del Grupo GIMM de la UTP para el desarrollo propio de equipos de depósito químico usando dos tecnologías: la de depósito químico de vapor asistida por aerosol (AACVD por sus siglas en inglés) y la técnica Sol-gel por inmersión, demostrando la posibilidad real de desarrollo y apropiación de estas dos técnicas en beneficio de la mejora tecnológica del grupo, y que es también puesta a la disposición de la sociedad académica e industrial de la región cafetera para cubrir una necesidad faltante hasta hace unos cuantos años.
Proceedings of the ISES Solar World Congress 2019, 2019
In the field of electromagnetic material studies, the use of magnetometers is important by itself... more In the field of electromagnetic material studies, the use of magnetometers is important by itself, in particular Kerr magnetometer (MEK). Several considerations for the implementation of this kind of equipment are formulated and scoped to the experimentalist, and a comparative analysis of the most common implementations from the instrumental and costs reduction.
La termografia activa infrarroja por calentamiento mediante escalon de calor (TRIR) es una tecnic... more La termografia activa infrarroja por calentamiento mediante escalon de calor (TRIR) es una tecnica que permite a traves del analisis de las imagenes termograficas obtenidas, cuantificar los defectos superficiales de una superficie de estudio. Para lograr esta cuantificacion, la emisividad del blanco y la radiacion del entorno deben ser consideradas al momento de capturar una imagen. En este articulo se realizaron capturas de imagenes termograficas con una camara Fluke Ti-32, sobre muestras patron de plexiglas, aluminio, acero y titanio; usando la tecnica TRIR con un ancho de escalon de 5 minutos. Se registraron imagenes con un tiempo de muestreo de 30 segundos tanto en la etapa de calentamiento como en la etapa de enfriamiento. Los valores de emisividad se variaron entre 0.2 y 1.0 para finalmente poder cuantificar el tamano de los defectos mediante el procesamiento de las imagenes con Matlab. Las muestras patron fueron disenadas de modo tal que se tienen 16 defectos artificiales cir...
Journal of Physics: Conference Series, 2019
By mean of mechanical alloying the synthesis of Bi 0.4 Sr 0.6 FeO 3–δ ceramic powders were achiev... more By mean of mechanical alloying the synthesis of Bi 0.4 Sr 0.6 FeO 3–δ ceramic powders were achieved according to the stoichiometric relations of Bi 2 O 3, Fe 2 O 3 and SrCO 3 initial powders. Then thermal treatments in air both 800 °C as 825 °C as at function on time was carried out on the processed ceramic powders, which were posteriorly characterized via X-ray diffraction and thermogravimetric. Finally, uniaxial compaction of the chosen processed powders to 800 °C was performed adding polyvinyl alcohol (PVA) or butyral alcohol (PVB) try to find a higher porosity. The milled ceramic compound presented a single cubic phase with lattice parameters of 3.95Ȧ when it was thermally treated at 800 °C and only 30 min of thermal treatment. No change on lattice parameter was found with higher treatment time. Thermogravimetric analysis showed processed powder are stable to work at the operation temperature of the solid oxide fuel cell chosen. In regard to porosity, the results showed that an ...
Ingenieria y Universidad
We present the design, construction, and implementation of thin film deposition equipment based o... more We present the design, construction, and implementation of thin film deposition equipment based on the Sol/Gel dip-coating technique for the fabrication of coatings under controlled deposition conditions and working environment at ambient temperature and pressure. The deposition system includes a 304 stainless steel structure and a moving platform that holds the substrate and is transported along vertical axes at a deposition distance of up to 30 cm in height. The mechanical and electronic design was considered, using computer-aided development and dimensional validation (for the structure and the motion transmission system) and the programming of the system using the Arduino platform. The design focused on the deposition speed control for the functional equipment operations, whose operating principle is based on a PWM scheme, achieving an immersion/extraction speed parameter in ranges between 1.5 cm/s and 3.5 cm/s (with a resolution of ± 0.2 cm/s). The operation of the equipment an...
Se habló sobre la importancia no solo de emplear de energías no fósiles sino también de crear tec... more Se habló sobre la importancia no solo de emplear de energías no fósiles sino también de crear tecnología propia, es decir, crear empresa alrededor de estos temas para no depender de la tecnología importadaUniversidad Tecnológica de Pereir
Se discute sobre la importancia del apoyo económico gubernamental nacional e internacional para i... more Se discute sobre la importancia del apoyo económico gubernamental nacional e internacional para impulsar la investigación en ciencia básica y aplicada para en un futuro poder producir nuestra propia tecnología y no depender de tecnología extranjera. Lo cual generará no solo desarrollo a nuestros países latinoamericanos sino empleo, etc...Fondo sectorial CONACYT - SENE
Scientia et Technica, 2020
La técnica de Depósito Químico de Vapor Asistido por Aerosol (AACVD) es un proceso de atomización... more La técnica de Depósito Químico de Vapor Asistido por Aerosol (AACVD) es un proceso de atomización de la solución precursora, generando gotas que se envían por medio de un gas portador hacia la superficie del sustrato, formando una película delgada cuyas propiedades dependerán de variables como la velocidad de depósito, temperatura del sustrato, tamaño de la gota y número de capas. En éste trabajo se presentan los criterios de diseño mecánico, eléctrico y electrónico empleados para implementar la técnica. El prototipo consiste en una estructura metálica que soporta una placa calefactora y un porta-sustrato donde se ubica la muestra a recubrir; la placa es controlada con un microcontrolador de potencia para mantener constante la temperatura del sustrato. Además, se implementó un sistema de pulverización con un nebulizador ultrasónico 241TM y un sistema de calentamiento de aire con un horno en función rampa MC5438. La tobera de inyección del vapor es guiada por un motor a paso NEMA 17 ...
Optik, 2021
Abstract Nanorods of aluminum doped zinc oxide films (AZO) were grown on borosilicate glass subst... more Abstract Nanorods of aluminum doped zinc oxide films (AZO) were grown on borosilicate glass substrates using an rf-sputtering technique combining simultaneously substrate twisting motion frequency with sustained rotation. Twist-motion frequency of 0.35, 0.5, and, 0.75 Hz between 40° to -40° taking the horizontal plane as reference was adjusted. Effects of this twist-motion frequency as a function of the sustained azimuth rotation of the substrate at 15, 30, and 45 rpm were observed. The morphological, optical, and structural properties were compared between films. Well defined vertical nanorods shapes were observed. The thickness of the films is affected by both twist motion and rotation speed, and the average optical transmittance was greater than 80 % which shows that all samples have high transparencies in the visible range. The combination of these growth parameters of twist and rotation of the substrate allowed us to obtain refractive index values between 1.77 and 2.11 at a wavelength of 700 nm and an energy bandgap in the range of 3.47 and 3.63 eV. The crystallite size of the nanorods obtained was between 29 and 40 nm and the films showed a preferential orientation normal at the surface film to direction of the c-crystallographic plane (002). We report compressive stress in our samples.
We present the theoretical analysis using simulation of micromagnetic behavior in an iron thin fi... more We present the theoretical analysis using simulation of micromagnetic behavior in an iron thin film, through the software Object Oriented Micromagnetism Framework (OOMMF). The results are compared with data obtained by experimental for Fe films grown by Pulsed Laser Deposition (PLD) Magnetic measures were carried out through Magneto-Optic Kerr Effect (MOKE) revealing hard ferromagnetic behavior of the film at room temperature consistent with the simulations. The coercive field have an error of only 9% posibly due to considerations of temperatura. The magnetization diagrams and energy curves show the precense of multiple mechanism of magnetization in this system
Hyperfine Interactions, 2017
Fe 96−x Co x C 4 (x = 0, 10, 20, 30, 40 at. %) alloys were obtained by mechanical alloying of Fe,... more Fe 96−x Co x C 4 (x = 0, 10, 20, 30, 40 at. %) alloys were obtained by mechanical alloying of Fe, C and Co powders using high-energy milling. The structural and magnetic properties of the alloy system were analyzed by X-ray diffraction, Scanning Electron Microscopy (SEM), Vibrating Sample Magnetometer (VSM) and Mössbauer Spectrometry at room temperature. The X-ray diffraction patterns showed a BCC-FeCoC structure phase for all samples, as well as a lattice parameter that slightly decreases with Co content. The saturation magnetization and coercive field were analyzed as a function of Co content. The Mössbauer spectra were fitted with a hyperfine magnetic field distribution showing the ferromagnetic behavior and the disordered character of the samples. The mean hyperfine magnetic field remained nearly constant (358 T) with Co content.
Se presentan los criterios de diseno, construccion y los parametros de operacion de un contador p... more Se presentan los criterios de diseno, construccion y los parametros de operacion de un contador proporcional de flujo de gas para la implementacion de la tecnica de espectroscopia Mossbauer de electrones de conversion integral (ICEMS). El detector opera en conjunto con un sistema de deteccion multicanal y una fuente de radiacion γ de alta energia 57Co. Se utilizo como gas multiplicador un flujo constante de una mezcla 5% de CH4 en He, el cual aumento la intensidad de la senal y protegio la superficie de la muestra de descargas electricas. En el diseno se considero un filtro interior para rayos X de baja energia que favorecio la coleccion de datos, con lo cual se registro un menor ruido de fondo y se logro optimizar el volumen de gas consumido. Con este detector ICEMS construido se pueden caracterizar eficientemente las propiedades magneticas y estados de oxidacion (interacciones hiperfinas) tanto de materiales en volumen como en peliculas delgadas. La calibracion del dispositivo se ...
The design, construction and operation parameters of a gas flow proportional counter are presente... more The design, construction and operation parameters of a gas flow proportional counter are presented in order to implement the integral conversion electron mossbauer spectroscopy technique (ICEMS). The detector works with the support of a multi-channel detection system and a source of highenergy radiation of 57Co. A constant gas flow of a mixture of 5% CH4 in He was used as a multiplier gas, which increased the signal intensity, and protected the sample´s surface of electric shocks. An internal filter for low energy X-rays was considered during the design to achieve a lower background noise and optimize the volume of gas consumed. With this built-in ICEMS detector it is feasible to characterize efficiently the magnetic properties and oxidation states (hyperfine interactions) of both bulk materials and thin films. The calibration of the device was performed by using an iron sample synthesized by powder metallurgy. It was successfully identified the presence of a distinctive sextet of t...
In this work experimental analysis was carried out between incidence angle an Kerr signal intensi... more In this work experimental analysis was carried out between incidence angle an Kerr signal intensity, that influences in the hystereteresis shape behavior, which establishes a direct relationship between both for longitudinal configuration on the Kerr Magnetometer. The results show a better behavior of the curve for the defined range from 10° to 60° of incident angle.
Se realizo la sintesis de Fe-20at%Al por aleacion mecanica (AM) para diferentes frecuencias de os... more Se realizo la sintesis de Fe-20at%Al por aleacion mecanica (AM) para diferentes frecuencias de oscilacion y tiempo de molienda, en un mezclador MM400-Restch con relacion masa bolas-masa polvo 4:1. La caracterizacion estructural se realizo por difraccion de rayos X, y la caracterizacion magnetica mediante magnetometria de muestra vibrante y espectroscopia Mossbauer de transmision (MS) a temperatura ambiente. En la primera etapa se realizo la molienda a frecuencia variable (15-30Hz) para 6 horas de molienda sin la presencia de Agente Controlador del Proceso (PCA). El analisis de los difractogramas revelo que en 25Hz inicio el proceso de formacion de la fase α-Fe(Al). Debido a la adherencia presentada por los polvos en las paredes de los jarros, en la segunda etapa se utilizo etanol como PCA variando el tiempo de molienda entre 6 y 12 horas a 25Hz. Se hallo que el parametro de red, calculado a partir del refinamiento de los difractogramas, aumento con respecto al del α-Fe, siendo (0,28...
Is presented in this paper the experience of the authors, by which it has implemented a methodolo... more Is presented in this paper the experience of the authors, by which it has implemented a methodology that directed to ensure the quality of measurements performed in experimental practices of the physics lab courses aimed at basic training for engineering students from the Technological University of Pereira (UTP). To fulfill this objective, the students of the physics lab course were immersed into the context of national and international standards that exists around the issues and metrological vocabulary, and were introduced to the application of a generic methodology for the estimation of the measurement uncertainty of experimental results. This methodology has been designed and implemented with the goal of creating a culture around this topic. The methodology is based on the GUM "Guide to the Expression of Uncertainty in Measurement" published by ISO used in scientific, industrial and legal areas. This methodology has been designed and implemented with the goal of creat...
En nuestro pais la mayoria de los desarrollos e investigaciones que se realizan no cuentan con un... more En nuestro pais la mayoria de los desarrollos e investigaciones que se realizan no cuentan con un aseguramiento de la calidad de las mediciones, el cual implica como minimo la utilizacion de instrumentos calibrados que aseguren su trazabilidad. Unido a todo esto, la infraestructura de laboratorios de metrologia en nuestro pais no es la adecuada comparada con paises como Brasil o Mexico; todo lo anterior hizo que los miembros del grupo de electrofisiologia del departamento de fisica de la Universidad Tecnologica de Pereira, desde el ano 2000 iniciaran todo un proceso de capacitacion en temas metrologicos y normativos que condujo a la presentacion de proyectos de investigacion a COLCIENCIAS que tenian entre sus objetivos principales disponer de laboratorios de metrologia en las areas de calibracion de equipos de medidas electricas y equipo electro-medico, este objetivo se logro; en la actualidad se dispone de laboratorios de metrologia acreditados bajo la norma NTC-ISO/IEC – 17025, en...
We present a magnetometer Kerr ex situ (MEK), in conventional configuration, which operates under... more We present a magnetometer Kerr ex situ (MEK), in conventional configuration, which operates under normal ambient conditions in a range of 0.0 to 1000 mT ± 0.2%. This device is the result of the analysis of signals involved in this effect magneto-optic and study instrumental made to the types of MEK identified. Besides are describe the components that make up. To test the magnetometer, measurements were carried out on a sample of Permalloy (NiFe), a material that had been previously measured, with the magnetometer Kerr differential (DMOKE)of Solid State Group at the University of Antioquia.
En éste libro presentamos y compartimos la experiencia del Grupo GIMM de la UTP para el desarroll... more En éste libro presentamos y compartimos la experiencia del Grupo GIMM de la UTP para el desarrollo propio de equipos de depósito químico usando dos tecnologías: la de depósito químico de vapor asistida por aerosol (AACVD por sus siglas en inglés) y la técnica Sol-gel por inmersión, demostrando la posibilidad real de desarrollo y apropiación de estas dos técnicas en beneficio de la mejora tecnológica del grupo, y que es también puesta a la disposición de la sociedad académica e industrial de la región cafetera para cubrir una necesidad faltante hasta hace unos cuantos años.
Proceedings of the ISES Solar World Congress 2019, 2019
In the field of electromagnetic material studies, the use of magnetometers is important by itself... more In the field of electromagnetic material studies, the use of magnetometers is important by itself, in particular Kerr magnetometer (MEK). Several considerations for the implementation of this kind of equipment are formulated and scoped to the experimentalist, and a comparative analysis of the most common implementations from the instrumental and costs reduction.
La termografia activa infrarroja por calentamiento mediante escalon de calor (TRIR) es una tecnic... more La termografia activa infrarroja por calentamiento mediante escalon de calor (TRIR) es una tecnica que permite a traves del analisis de las imagenes termograficas obtenidas, cuantificar los defectos superficiales de una superficie de estudio. Para lograr esta cuantificacion, la emisividad del blanco y la radiacion del entorno deben ser consideradas al momento de capturar una imagen. En este articulo se realizaron capturas de imagenes termograficas con una camara Fluke Ti-32, sobre muestras patron de plexiglas, aluminio, acero y titanio; usando la tecnica TRIR con un ancho de escalon de 5 minutos. Se registraron imagenes con un tiempo de muestreo de 30 segundos tanto en la etapa de calentamiento como en la etapa de enfriamiento. Los valores de emisividad se variaron entre 0.2 y 1.0 para finalmente poder cuantificar el tamano de los defectos mediante el procesamiento de las imagenes con Matlab. Las muestras patron fueron disenadas de modo tal que se tienen 16 defectos artificiales cir...