PROPUESTA PARA IMPLEMENTAR UN SENSOR OPTOELECTRÓNICO BASADO EN UN FILTRO ÓPTICO SENSIBLE A LA TEMPERATURA E ÍNDICE DE REFRACCIÓN (PROPOSAL TO IMPLEMENT AN OPTOECLECTRONIC SENSOR BASED ON AN OPTICAL FILTER SENSITIVE TO TEMPERATURA AND REFRACTIVE INDEX)

Miguel Angel López Durán, Ana Dinora Guzmán Chávez, Everardo Vargas Rodríguez, Martín Cano Contreras Cano Contreras, Leonardo Martínez Jiménez

Resumen


Resumen
En este trabajo se presenta una propuesta para implementar un sensor optoelectrónico basado en un filtro óptico sensible a la temperatura e índice de refracción. Aquí, la respuesta del filtro espectral (un patrón de franjas) es analíticamente modelada y se muestra que la posición de las franjas y su amplitud pico a pico se ven afectados por la temperatura y el índice de refracción externo. Además, se muestra que evaluando la intensidad acumulada relativa de ciertos segmentos del espectro, es posible establecer relaciones casi lineales con ambas variables físicas. Basándonos en estos principios, se presenta la propuesta de un sensor optoelectrónico para medir el índice de refracción de 1–2.5 UIR y la temperatura de 25–56 oC usando un láser sintonizable, un detector de infrarrojo, el filtro espectral fabricado y una etapa electrónica de acondicionamiento y procesamiento de señales. Finalmente, se presenta el modelo matemático del sensor optoelectrónico propuesto.
Palabras Clave: Índice de refracción, interferómetro, sensor no dispersivo, sensor optoelectrónico, temperatura.

Abstract
In this work a proposal to implement an optoelectronic sensor based on an optical filter which is sensitive to temperature and refractive index is presented. Here, the spectral filter response (a fringe pattern) is analytically modeled and it is shown that the position of the fringes and their peak-to-peak amplitude are affected by temperature and the external refractive index. Besides, it is shown that by evaluating the relative accumulated intensity of certain portions of the spectrum, it is possible to establish cuasi linear relationships with both physical variables. Based on these principles, an optoelectronic sensor to measure refractive index from 1–2.5 UIR and temperature from 25–56 oC by using a tunable laser, an infrared photodetector, the fabricated spectral filter and a stage of electronic conditioning and signals processing is proposed. Finally the mathematical model of the proposed optoelectronic sensor is provided.
Keywords: Interferometer, non-dispersive sensor, optoelectronic sensor, refractive index, temperature.

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Referencias


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