INSTITUTO TECNOLOGICO SUPERIOR DE POZA RICA
PROYECTO: COLORIMETRO
MATERIA: SEMINARIO DE MECATRONICA MECATRONICA
12/06/2013
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INDICE: Objetivo…………………………………………………………………………………………………………………………………………1 ………………..…………………………………………………… ………………………………………… …………………………………………… …………………………………….2 …………….2 Introducción………………..………………………………
Color…………………………………………… ………………………………………………………………… ………………………………………… …………………………………………… ………………………………………………….2.1 ………………………….2.1 Espectro electromagnético ……………………………………………………………………………………………………….2.2 Transmitancia………………………………………… ……………………………………………………………… ………………………………………… ……………………………………………………………2.3 ………………………………………2.3 Absorbancia………………………………………… ………………………………………………………………… …………………………………………… …………………………………………………………….2.4 ……………………………………….2.4 Colorimetría………………………………………………………………………………………………………………………………2.5 Leyes de la colorimetría colorimetría………………………………………………………………………………………………………………2.6 Colorímetro………………………………………………………………………………………………………………………………..….3 Elementos principales principales de emisión y recepción del dispositivo ………………………….…………………3.1 Interfaz labview……………………………………………………………………………………………………………………….3.2 Diseño del circuito circuito ……………………………………………………………………………………………………………………3.3 Simulación Simulación del de l circuito circuito ……………………………………………………………………………………………………………… .3.4 Circuito ensamblado …………………………………………………………………………………………………………………3.5 diseño dise ño del cable para conectar el e l led ala ala placa principal ………………………………………………………….3.6 circuito totalmente totalme nte armado…………………………………………… ………………………………………………………………… ………………………………………… ……………………………………..3.7 ………………..3.7 Contenedor de de aislamiento de la ldr y led rgb ……………………………………………………………………………3.8 programa del pic16f88……………………………………………………………………………………………………………….3.9 programa de interfaz en labview ………………………………………………………………………………………………3.10 bloque de transmisión y recepción de datos ……………………………………………………………………………3.11 sección de procesamiento de las señales se ñales …………………………………………………………………………………3.12 Sección de almacenamiento almacen amiento de datos
3.13 3.1 3
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1-OBJETIVO DEL PROYECTO:
Es realizar un dispositivo que será capaz de realizar la medición de o lo que es lo mismo 16.777.216 tonos de colores atravesó de una ldr sobre la cual se pondrán los colores y según la señal captada por la interfaz que será en labview quien procesara toda las señales y después en la computadora computadora nos nos mostrara mostrara de qué qué color se trata, además puede guardar en registro regis tro los colores censados en Excel Exc el ya que todos todos los colores serán mostrados en la computadora usando una aplicación de labview y que nos permite ir guardando un registro de los elementos censados , de ahí podemos usar los registros de colores según sea nuestro interés en ellos ya sea para clasificar o ordenar y saber cuántos elementos de cierto color fueron censados en una producción, pero esa ya será según sea la necesidad del usuario nosotros solo nos centraremos en diseñar el circuito que censara y en la interfaz del programa para mostrando el color. Gracias al proyecto tendremos un dispositivo que puede ser gran uso pudiendo ser una herramienta económica pero fiable para todos los profesionales que deseen tener un control digitalizado del color de cualquier muestra para poder reproducirla exactamente sin ninguna complicación.
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2-INTRODUCCION: El presente proyecto de investigación trata sobre sobre un colorímetr colorímet ro y su funcionamiento, funci onamiento, antes de decir que e es un colorímetro definiremos que es la colorimetría ya que es en base a esta ciencia que es posibles fabricar un dispositivo como un colorímetro. La colorimetría es la ciencia que estudia la medida de l os colores colores y que desarrolla métodos para la cuantificación cuantificación del color, es dec de cir la obtención de valores numéricos numéricos del color color y así resolver la necesidad de estandarizar estandariz ar el color para poderlo clasificar clasif icar y reproducir. reproducir.
Las aplicaciones para dicho dispositivos son infinitas, desde la determinación exacta del color en las pinturas, pinturas, como analíticas en la determ determinación inación de concentraciones, concentraciones, son utilizados por los traficantes de diamantes para determinar la transparencia de las gemas y piedras preciosas. Otros usos de colorímetros incluyen medir la exactitud, calidad y estado de los componentes electrónicos y la identificación de los caracteres de la pasta de papel y tinta de impresión. Hoy en día ya se utiliza hasta en las peluquerías para determinar los tonos de los tintes, esto nos hace pensar que su utilidad puede estar en todos los campos donde el color sea un elemento determinante. El color es una variable variable importante importante pa pa ra muchas muchas aplicaciones industriales. industriales. La industria industria química, petroquímica, farmacéutica, del vidrio, pinturas, papel, automotriz, textil entre otras, requieren de instrumentos ópticos. Pero como funciona un colorímetro El proyecto que se pretende pretende realizar para obtener obtener el color col or usando un colorímetro colorímetr o y a ser la interfaz con el programa de labview y así mostrar el un aplicación a través de la computadora el color que se está censando, esto lo lograremos usando un dispositivo como una una fuente de emisión emis ión de de luz led RGB y foto receptor sensible sens ible ala luz refl reflejada ejada en el el objeto debido de bido al emisor, emis or, dicha señal seña l recibida por el sensor se transf transform ormara ara en voltaje que y entra entra ra al dispositivo micro controlador, para para recibir la señal de foto receptor receptor se utilizara un pic16f88 pic16f88 el cual se s e encargara encargara de recibir la señal y procesa procesarla rla y poder poder enviarla envia rla a nuestro equipo pc y teniendo un programa de simulación entiempo real dicha señal será procesada por labview el cual se encargara en base ala señal definir que color se esta censando o que color estamos muestreando, en el proceso realizado por la interfaz se determinara previamente la absorbancia y transmitancia de la señal y en base a eso se identificara el color, las ecuaciones y operaciones necesarias ya están establecidas en el simulador en tie tiemp mpo o real. A continu continuación ación conoceremos varias de las definiciones y conceptos respecto al desarrollo de un colorímetro.
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2.1-EL COLOR es una percepción visual que se genera en el cerebro de los humanos y otros animales al interpretar las señales nerviosas que le envían los foto receptores receptores en la l a retina del ojo, que a su vez interpretan y distinguen las distintas longitudes de onda que captan de la parte visible visi ble del del espectro electr elec trom omagnético agnético (la luz). Todo cuerpo iluminado absorbe una parte de las ondas electromagnéticas y refleja las restantes. Las ondas reflejadas son captadas por el ojo e interpretadas en el cerebro como distintos colores según las longitudes de ondas correspondientes. 2.3-ESPECTRO ELECTROMAGNETICO Se define espectro electromagnético a la distribución energética al conjunto de las ondas electromagnéticas.
El espectro electromagnético se extiende desde la radiación de menor longitud de onda (rayos gamma, rayos X), hasta las de mayor longitud de onda (ondas de radio y de
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Las ondas electromagnéticas de alta frecuencia tienen una longitud de onda corta y mucha energía mientras que las ondas de baja frecuencia tienen grandes longitudes de onda y poca energía.El ojo humano sólo percibe las longitudes de onda cuando la iluminación es abundante. Con poca luz se ve en blanco y negro. En la denominada síntesis aditiva (comúnmente llamada "superposición de colores luz") el color blanco resulta de la superposición de todos los colores, mientras que el negro es la ausencia de color. En la síntesis sustractiva (mezcla de pinturas, tintes, tintas y colorantes naturales para crear colores) el blanco solo se da bajo la ausencia de pigmentos y utilizando un soporte de ese color y el negro es resultado de la superposición de los colores cian, magenta y amarillo. 2.3-LA TRANSMITANCIA La transmitancia se define como la cantidad de energía que atraviesa un cuerpo en determinada cantidad de tiempo. ti empo.
Existen varios tipos de transmitancia, dependiendo de qué tipo de energía consideremos. La transmitancia óptica se refiere a la cantidad de luz que atraviesa un cuerpo, en una determinada longitud de onda. Cuando un haz de luz incide sobre un cuerpo traslúcido, una parte de esa luz es absorbida por el mismo, y otra fracción de ese haz de luz atravesará el cuerpo, según su transmitancia. El valor de la transmitancia óptica de un objeto se puede puede determinar según se gún la siguiente sig uiente expresión: expresi ón:
I es
la cantidad de luz transm transmitida itida por la muestra muestra e I 0 es la cantidad ca ntidad total total de luz l uz incidente. incidente. Muchas Muchas veces encontr encontraremos aremos la transmitancia transmitancia expresada en porcentaje, porcentaje, según s egún la fórmu fórmula: la:
2.4-ABSORBANCIA Cuando un haz de de luz incide inci de sobre sobre un cuerpo cue rpo traslúci tras lúcido, do, una parte de esta luz es absorbida absorbida por el cuerpo c uerpo,, y el haz de luz restante atraviesa atravies a dicho cuerpo. cuerpo. A mayor cantidad ca ntidad de luz absorbida, mayor será la absorbancia del cuerpo, y menor cantidad de luz será transmitida por dicho cuerpo. Como se ve, la absorbancia y la transmitancia son dos aspectos del mismo fenómeno. La absorbancia, a una determinada longitud de onda
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Para medir esta absorbancia, se hace incidir un haz de luz con determinada intensidad y longitud de onda, sobre la solución, y se mide la luz transmitida al otro lado de la cubeta que contiene dicha solución. Estas técnicas están comprendidas en el área de la espectrofotometría
2.5-COLORIMETRIA La colorimetría es la ciencia que estudia el color que desarrolla métodos para cuantificar el color y que describe de forma numérica los aspectos psicofísicos atribuidos al color que están dentro de nuestros límites de percepción visual. Dentro de la radiación luminosa se puede observar
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El procedimiento utilizado en la medida del color consiste sustancialmente en sumar la respuesta de estímulos de colores y su normalización a la curva espectral de respuesta del foto receptor sensible al color. Como referencia, se utiliza la curva espectral codificada de la Comisión Internacional de Iluminación, (conocida por sus siglas CIE en francés), la llamada función colorimétrica. Debe notarse que el color es una característica subjetiva, pues solo existe en el ojo y en el cerebro del observador humano, no siendo una característica propia de un objeto. Los foto receptores del ojo humano son los conos de la retina, de los que existen diferentes tipos, con sensibilidades diferentes a las distintas partes del espectro luminoso.
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estudia continuamente distintas sombras, polvos y colores para el cabello y todo eso es posible gracias a la colorimetría. Otra actividad en donde se la emplea es en el medio gráfico, en especial cuando se suscitan problemas en la reproducción de los colores y en todos los análisis y documentaciones de aquellas superficies que datan desde muchos años atrás, como c omo es el caso cas o de los policrom polic romados ados y de los cuadros también. 2.6-LEYES DE LA L A COLORIMETRIA Las leyes de la colorimetría establecen los siguientes, Las tres características que determinan el color son el brillo, matiz y saturación. En este capítulo veremos el modo de representar el color mediante coordenadas con el fin de intentar representar la sensación del color de una forma objetiva, también en las teorías sobre la visión los diferentes intentos intentos de dar una una base científica científic a al fenómeno fenómeno de de la l a visión visi ón,, con las teorías tricromática tricromática y de los antagonistas. Sería el físico alemán Grass Grassmann, mann, quién sistematiza la teoría teoría de la mezcla especia espec iall aditiva del color en las conocidas Leyes de Grassmann. Estas muestran que cualquier color puede expresarse como suma de tres colores primarios, es decir, de tres colores, cada uno de los cuales no puede obtenerse por la mezcla de los otros dos. Aplicando sus leyes, se obtiene la denominada ecuación unitaria del color, que representada, da una forma parecida a un triángulo, el triángulo internacional de color. El área dentro de las tres curvas que se obtienen con este procedimiento dan origen a tres valores: las coordinadas triestímulo X, Y y Z ligadas a las coordinadas coordinadas de cromaticidad cromaticidad x e y por relaciones linea l ineales. les. El paso pas o de un espacio espacio de color c olores es a otro son datos de relaciones de transformación de coordenadas.
1ª LEY DE GRASSMANN
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iguales ig uales cantidades en termino termino de de lúmenes sino en unidades tricromátic tricromáticas as.. Las unidades unidades T están relacionadas con los lúmenes de la siguiente s iguiente forma: forma:
1 unidad T de rojo = 0,30 lúmenes de rojo. 1 unidad T de verde = 0,59 lúmenes de verde. 1 unidad T de azul = 0,11 lúmenes de azul. 3 unidades T = 0,30+0,59+0,11 = 1 lúmen de blanco. 2ª LEY
Cualquier radiación cromática que se mezcle aditivamente con otra, puede ser sustituida por otra radiación cromáticamente equivalente.
3ª LEY Siempre que dos superficies nos produzcan la misma sensación cromática podemos variar su luminancia, manteniendo constante el matiz y la saturación, sin que varíe la igualdad cromática entre las dos superficies. Esta ley nos permitirá representar el color en una superficie y no en un sólido como veremos al estudiar el TIC (Triángulo Internacional de Color).
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3-COLORIMETRO
La definición mas básica de colorímetro es un instrumentó que es capas de medir el color,Siguiendo este significado, cualquier instrumento que cuente con la capacidad de identificar un color para facilitar su medida es un colorímetro. En términos generales, el colorímetro es el dispositivo que permite la cuantificación de un color y permite su comparación con otro. Una vez hecha la cuantificación, el valor numérico asignado al color estudiado permitirá su adecuada clasificación en la escala de colores, y poderlo aplicar a un sistema si stema ya ya sea para selección selecci ón.. Cualquier colorímetro esta basado en la teoría de absorción de la luz por un medio transparente coloreado, básicamente an sido 4 colaboradores Ilustración 1primer colorímetro que an abordado este tema a lo gargo de varios años cada uno en diferentes épocas Pierre bouguer (1729), johann Lambert (1760), felixbernard (1852),y augustbeer (1852). Gracias Gracias a las investigaciones de Lambert sus principal principales es contribuciones en el campo de la matemática y la física y publicó en 1760 un
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El colorímetro es un aparato basado en la ley de absorción de la luz habitualmente conocida como de "Lambert-Beer". La Ley L ey Lambert Lambert Beer es un medio matemático de expresar cómo có mo la materia materia absorbe absorbe la luz. Esta ley afirma que la cantidad de luz que sale de una muestra es disminuida por tres fenómenos físicos: 1. La cantidad de material de absorción en su trayectoria (concentración) 2. La distancia que la luz debe atravesar a través de la muestra (distancia de la trayectoria óptica) 3. La probabilidad de que el fotón de esa amplitud particular de onda sea absorbido por el material (absorbencia o coeficiente de extinción) Esta relación puede ser expresada como: A = εdc
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Funciones del colorímetro El colorímetro colorímetro tiene tres funciones específica es pecíficas, s, que son: 1. Determinar el valor numérico de un color. 2. Llevar a cabo una comparación entre colores. 3. Establecer Es tablecer la intensidad intensidad y los l os matices matices del color estudiado. estudiado. Aplicaciones Aplicaci ones del colorímetr colorímetro o
Entre las principales aplicaciones del colorímetro se encuentran: - Clasificación de colores. - Pruebas de absorbancia. - Corrección de errores en monitores y pantallas. - Calibr Cali bración ación de colores de impr impresoras. esoras.
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3.1-ELEMENTOS 3.1-ELEMENTOS PRINCIPALES DE EMISION Y RECEPCION DEL DISPOSITIVO
En esta parte parte del documento documen to se describirán las partes del circuito y cual es su función, cada una de las l as partes partes del circuito circuito se dividirán por bloques.
1-
Dispositivos Dispositi vos de Entrada, Recepción y Salida
En el área de emisión emisión del circuito circui to se encuentra Un Led Led RGB que es el que usaremos usaremos en nuestro nuestro circuito para generar generar una señal señal en el receptor usando la luz que el led RGB, pero primero describi describirremos primero que que es un LED LED normal (de la sigla inglesa inglesa LED: LED: Light- EmittingD mit tingDiode: iode: „diodo emisor de luz‟) es un diodo semi conductor que emite l uz. uz.
LED RGB Es un led que dispone de 3 colores rojo, verde y azul ,los cuales pueden ser activado usando una secuencia para para poder encenderlos encenderlos y usarlos usarlos según sea la necesidad necesidad . El diodo Full Color Color (RGB), el color rojo con una l ongitud de 624nm 624nm y con 360 mil icandelas icandelas de intensidad intensidad lu l uminosa, minosa, el color azul tiene una longitud de onda de 470nm y 100 milicandelas y el color verde con longitud de 525nm con una intensid i ntensidad ad de 565 565 milicandelas.
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2- Dispositivo Dispositi vo de recepción. recepción. Resistencia LDR En el área de recepción tenemos un dispositivo sensible ala luz, se grata de una LDR ,Una LDR LDR es fotorresistencia es un componente componente electrónico electrónico cuya resistencia resiste ncia disminuye disminuye con el aumento de i ntensidad ntensidad de luz l uz incidente. La función de la LDR en nuestro circuito es de gran importancia ya que esta nos va a permitir medir la cantidad de luz, ya que como mencionamos anterior mente cada vez que se incide luz sobre un objeto este la refleja , la luz y nos da la posibilidad de de definirlo definirlo bajo ciertos crite criterrios como colo color, r, esta propiedad conocida como espectro electromagnético, nos permitirá medir la luz que se refleja en el objeto que estamos midiendo y así poder determinar el color que estamos midiendo.
3.2-INTERFAZ LABVIEW Es un programa que nos nos permitirá recibir ecibi r la señal emitida emitida por po r la LDR , ya que la LDR nos va a proporcionar en total 3 varias que son los 3 colores del ledrgb, ledrgb,
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mas importantes , las cuales son de emisión y trasmisión, asi como la de procesamiento de la señal , el cir cuito fue dis eñado en pcbwizard , debido debido a la fac i lidad y a que estamos estamos mas as ociados con este software.
En esta área conectaremos cada una de las extremidades del led con su correspond correspondiente iente color
Conector para el cable DB9
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3.4-SIMULACION DEL CIRCUITO EN PROTEUS Se realizo reali zo una simulación previ a ala fabricación fabricación en físico físi co del circuito para observar su funcionamiento, usando una interfaz virtual y cargando cargando el código original origin al del pic, pi c, así como todos los componentes del circuito.
La LDR sensor
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3.5-CIRCUITO ENSAMBLADO
Como vemos en esta imagen ya nuestro circuito esta completamente ensamblado, nos saltamos la partes de como los fuimos haciendo desde revelar la placa y soldar los componentes, por que consideramos que era algo que ya conocemos conocemos y no muy importante así que que solo céntranos cén tranos en si en su funcionamiento fun cionamiento como como tal.
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3.6-DISEÑO DEL DEL CABLE C ABLE PARA CONECTAR EL LED ALA PLACA PRINCIPAL PRINC IPAL
como observamos nuestro dispositivo dispositivo emisor que es el led l ed RGB consta consta de 4 entradas de las cuales cuale s una es tierra, tie rra, los demás rojo, rojo, azul, verde. Nos N os dimos ala tarea tarea de di señar un cable cable para poder insertar en el led le d y al mismo tiempo tie mpo resolver el problema del ruido ruid o ya que como como sabemos el ruido, puede ocasionarnos problemas en las señales y mas aun aun cuando la señal es demasiado de masiado pequeña como en nuestro nue stro caso. caso.
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3.7-CIRCUITO TOTALMENTE ARMADO el circuito circuito cuenta con con el cable de de conexión al led y ala LDR en esta ima i magen gen se muestra con su cable de conexión conexi ón ala pc completamente terminado y listo para usarse. usarse.
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3.8-CONTENEDOR DE AISLAMIENTO DE DE LA LDR Y LED RGB
Sección de aislamiento aislamiento de led l ed rgb y ldr l dr para evitar evi tar el paso de cualquier r otra luz que afecte la señal captada por la ldr l dr
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3.9-PROGRAMA DEL PIC16F88
A continuación mostramos el código del pic, con este código es posible establecer una
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output_high(PIN_B4);
delay_ms(500);
delay_ms(2000);
b= b+10000;
r=read_adc ();
output_low(PIN_B6);
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3.10-PROGRAMA 3.10-PROGRAMA DE INTERFAZ EN LABVIEW
A continuación les presento la imagen del programa con diagrama de bloques del nuestro código
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3.11-BLOQUE 3.11-BLOQUE DE TRANSMISION Y RECEPCION DE DATOS DATOS
En esta área del diagrama es lo primero que se establece es decir como se va a comunicar el
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3.12-SECCIÓN DE PROCESAMIENTO DE LAS SEÑALES
En esta área entran los tres valores del color rojo, verde y azul. Los cuales fueron captados por la
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