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3388610
Sensores Resistores
Description
PResentacion sobre sensores reistores
No tags specified
sensores resistores
sensores y acutadores
tipos de sensores
Mind Map by
Laura Hernandez 3024
, updated more than 1 year ago
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Created by
Laura Hernandez 3024
over 6 years ago
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Resource summary
Sensores Resistores
Termistores
Se fundamenta en la variación de la resistencia de un conductor debido a la variación de portadores por la temperatura
Tipos
NTC
PTC
Limitaciones
Temperaturas de fusion
Autocalentamiento
Intercambiabilidad compleja
Ventajas
Alta resistividad
Alta Sensibilidad
Bajo coste
Respuesta rapida
Detectores de temperatura Resistivos (RTD)
Se basan en la variacion de la resistencia de un conductor con la temperatura
Limitaciones
Temperaturas proximas al punto de fusión del conductor
Deformaciones mecánicas
Autocalentamiento
Ventajas
estabilidad
alta repetibilidad
Sensibilidad x10 la del Termopar
bajo coste
exactitud
Potenciómetros
Un resistor con un contacto móvil o giratorio
Resistencia es proporcional al movimiento del cursor.
La resistencia varía con la temperatura
Tipos
Giratorios
Lineales
Ventajas
simples
Robustos
Bajo costo
Magnetorresistencias
Se fundamentan en la variación de resistencia debido a la variación de campo magnético externo
Ventajas
Alta Sensibilidad
Alto rango de temperatura
Alto rango de frecuencia
Sistema de Orden cero
Galgas Extensiometricas
Se basan en la variación de la resistencia de un conductor o semiconductor cuando es sometido a una carga mecánica.
Limitaciones
margen elástico de deformaciones
la fuerza debe ser transmitida totalmente en la galga
Temperatura
Fuerza termo-electromotriz
Tipos
Metálicas
Semiconductoras
Fotorresistencia
Funcionan por la variación de resistencia de un semiconductor al inducir en el radiación optica
Aplicaciones
Detectores de presencia y posicion
Control Automático de brillo y contraste
Control de iluminación pública
Resistencias semiconductoras para la detección de gases
Variación de la conductividad de los semiconductores debido a la concentración de oxigeno
Higrometro
Funciona por la variación de la resistencia por la humedad
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