Sensores de Temperatura por Infrarrojos  

 

INFRARED THERMOCOUPLES
   Modelo IRTS-P
La medida de la temperatura de superficie es un parte crucial de la transferencia de energía.
Accurate measurement of the leaf-to-air temperature gradient is essential to the determination of transpiration rate and stomatal conductance in both single leaves and plant canopies. This gradient is often less than 3 oC, which means that leaf temperature should be measured to within 0.3 oC.  To achieve this accuracy, the Apogee Instruments precision IRTs use two, type-K thermocouple outputs. The primary thermocouple is used to measure the target temperature; the secondary thermocouple is used to measure the sensor body temperature. Errors caused by changes in the sensor body temperature are corrected in software with a 12-step subroutine.
Modelo IRR-P y Modelo IRR-PN:  2 sensores de temperatura por infrarrojo, los modelos IRR-P y el modelo IRR-PN, que mejora la sensibilidad de las medidas por infrarrojo de temperatura en comparación con los sensores IRTS-P.
The IRR-P and IRR-PN both feature an 8-14 µm germanium window that corresponds to the atmospheric window (ver Gráfica 1), a narrower field of view (ver Gráfica 2), matching accuracy (ver Gráfica 3), a higher or matching output signal (0.06 mV per ºC for IRR-P and 0.04 mV per ºC for IRR-PN; 0.04 mV per ºC for IRTS-P), and a thermistor for sensor body temperature measurement (ver Sensor de Oxígeno) on our Oxygen Sensor page for advantages of the thermistor over a thermocouple).

  
RADIOMETRO DE PRECISION POR INFRARROJO 
        Modelo IRR-P y Modelo IRR-PN
   
 
Campo de Visión:
(half angle)
 
Modelo IRR-P: 23.5o
Modelo IRR-PN: 19.0o
 
Precisión:
 
±  0.1 oC
with custom coefficients
  
Rango Calibrado:
 
-10 a 55 oC
  
ESPECIFICACIONES PARA MODELOS IRR-P Y IRR-PN
 

 

  
TERMOPAR DE PRECISION POR INFRARROJO
        Modelo IRTS-P / Modelo IRTS-P3*
        Modelo IRTS-Pb / Modelo IRTS-P3b*
        Modelo IRTS-Pc / Modelo IRTS-P3c*
           *  'P' models do not have air purge;
               'P3' models have air purge

 

 
Campo de Visión:
(half angle)
 
28.5o
Precisión:
 
IRTS-P / IRTS-P3: ± 0.50 oC
IRTS-Pb / IRTS-P3b: ± 0.24 oC
IRTS-Pc / IRTS-P3c: ± 0.15 oC 
Rango Calibrado:
 
-10 to 55 oC
 
ESPECIFICACIONES PARA MODELO IRTS-P
  

 

  
TERMOPAR DE PRECISION POR INFRARROJO CON PURGA DE AIRE, CAMPO DE VISION (FOV) ESTRECHO
Modelo IRTS-P5
   
Campo de Visión:
  
5:1
Precisión:
 
±  0.4 oC
Rango Calibrado:
 
-10 to 55 oC
  
ESPECIFICACIONES PARA MODELO IRTS-P5
  

 

  
KIT DE BOMBA PARA PURGA DE AIRE
    Modelo APK-1 o Modelo APK-2
For use with either Model IRTS-P5 or Model IRTS-P3 to assist in keeping the lens clean in dusty environments.

     Solicitar Modelo APK-2 para 12 VDC
 
  
 

 
CABLE ADICIONAL
Add type-K thermocouple wire to sensor with grounded connectors.

 

TRANSMISION ATMOSFERICA  Y VENTANAS DE LOS SENSORES
 
La ventana de 8-14 µm del IRR-P y el IRR-PN corresponden a la ventana atmosférica  con objeto de minimizar los efectos de bandas de agua por debajo de 8 um y por encima de 14 µm.

 

Gráfica 1: Pinchar sobre la imagen para ampliar

 

 ESPECIFICACIONES: MODELO IRR-P Y IRR-PN
 
ALIMENTACION REQUERIDA
2.5 V excitation (for thermistor)
ENTORNO OPERATIVO
Highly water resistant, designed for continuous outdoor use
Operating range is -40 oC to 70 oC and the calibrated range is  -10 oC to 55 oC (based on sensor body temperature)
PRECISION
± 0.1 oC with custom coefficients
PESO
190 g
DIMENSIONES
6 cm long; 2.3 cm diameter
TEIMPO DE RESPUESTA
Less than 1 second to changes in target temperature
SEÑAL DE SALIDA
Sensor Body Temperature: 0-2500 mV
Target Temperature: 60 µV per oC for IRR-P; 40 µV per oC for IRR-PN
CANALES REQUERIDOS DE REGISTRADOR DE DATOS
One differential (detector) and one single ended (thermistor)
OPTICA
Germanium lens
RANGO DE LONGITUD DE ONDA
8 to 14 µm
CAMPO DE VISION
The FOV of infrared sensors is typically specified as the half angle, but all sensors are center-weighted and there is not a sharp cut-off at the edges. The half angle of the IRR-P is 23.5o and the half angle of the IRR-PN is 19o.
GARANTIA
1 year
 ESPECIFICACIONES: MODELO IRTS-P5

 

ALIMENTACION REQUERIDA
None: self-powered
PRECISION
± 0.4 oC from - 5 to 40 oC

± 0.1 oC when sensor body and target are at the same temperature
REPETIBILIDAD
0.05 oC
PESO
 Less than 100 grams
DIMENSIONES
 6 cm long by 2.3 cm diameter
TIEMPO DE RESPUESTA
Less than 1 second to changes in target temperature
SEÑAL DE SALIDA
2, type K, twisted, shielded pair thermocouple outputs (4.5 meters each), one for target temperature, one for sensor body temperature. The sensor body temperature is used to make a correction in software for target temperature.   Compatible con los registradores HOBO.
OPTICA
Silicon lens
RANGO DE LONGITUD DE ONDA
6.5 to 14 micrometers
CAMPO DE VISION
For some applications, a narrow field of view (FOV) is important (smokestack temperatures), but a wider FOV has a better signal-to-noise ratio and more appropriately averages the leaf temperature of plant canopies when the sensor is mounted on a weather station. This narrow FOV sensor is useful for measuring leaf temperature during early plant growth because it can be mounted at an angle without seeing the sky.

The FOV of infrared sensors is typically specified by other manufacturers as the half angle, but all sensors are center-weighted and there is not a sharp cut-off at the edges.  FOV for this sensor is 5:1. Final data not available at this time. Come back to this page for updated testing and graphs for this sensor.
ENTORNO OPERATIVO
Highly water resistant, designed for continuous outdoor use
Optimum temperature range: - 5 oC to 40 oC (based on sensor body temperature)
GARANTIA
1 year
   

 

ESPECIFICACIONES: MODELO IRTS-P3

 

 

ALIMENTACION REQUERIDA
None: self-powered
PRECISION
± 0.4 oC from 5 to 45 oC

± 0.1 oC when sensor body and target are at the same temperature)
REPETIBILIDAD
0.05 oC from 15 to 35 oC
PESO
Less than 100 grams
DIMENSIONES
6 cm long by 2.3 cm diameter
TIEMPO DE RESPUESTA
Less than 1 second to changes in target temperature
SEÑAL DE SALIDA
2, type-K, twisted, shielded pair thermocouple outputs (4.5 meters each), one for target temperature, one for sensor body temperature.

Compatible con los registradores HOBO.
OPTICA
Silicon lens
RANGO DE LONGITUD DE ONDA
6.5 to 14 micrometers
CAMPO DE VISION
For some applications, a narrow field of view (FOV) is important (smokestack temperatures), but a wider FOV has a better signal-to-noise ratio and more appropriately averages the leaf temperature of plant canopies when the sensor is mounted on a weather station. The FOV of infrared sensors is typically specified by other manufacturers as the half angle, but all sensors are center-weighted and there is not a sharp cut-off at the edges.

For 90% of the signal, the FOV is 1.6 to 1, or 39o full angle, or 17o half angle. For 98% of the signal, the FOV is 1 to 1, or 52o full angle, or 26o half angle.
ENTORNO OPERATIVO
Highly water resistant, designed for continuous outdoor use
Optimum temperature range: 0 oC to 50 oC (based on sensor body temperature)
GARANTIA
1 year

 

 ESPECIFICACIONES: MODELO IRTS-P
 

 

ALIMENTACION REQUERIDA
None: self-powered
 PRECISION
± 0.4 oC from 5 to 45 oC

± 0.1 oC when sensor body and target are at the same temperature
 REPETIBILIDAD
0.05 oC from 15 to 35 oC
 PESO
Less than 100 grams
 DIMENSIONES
6 cm long by 2.3 cm diameter
 TIEMPO DE RESPUESTA
Less than 1 second to changes in target temperature
 SEÑAL DE SALIDA
2, type K, twisted, shielded pair thermocouple outputs (4.5 meters each), one for target temperature, one for sensor body temperature.

Compatible con los registradores HOBO.
 OPTICA
Silicon lens
 RANGO DE LONGITUD DE ONDA
6.5 to 14 micrometers
 CAMPO DE VISION
For some applications, a narrow field of view (FOV) is important (smokestack temperatures), but a wider FOV has a better signal-to-noise ratio and more appropriately averages the leaf temperature of plant canopies when the sensor is mounted on a weather station. The FOV of infrared sensors is typically specified by other manufacturers as the half angle, but all sensors are center-weighted and there is not a sharp cut-off at the edges.

For 90% of the signal, the FOV is 1.6 to 1, or 39o full angle, or 17o half angle. For 98% of the signal, the FOV is 1 to 1, or 52o full angle, or 26o half angle.
 ENTORNO OPERATIVO
Highly water resistant, designed for continuous outdoor use
Optimum temperature range: 5 oC to 50 oC (based on sensor body temperature)
 GARANTIA
 1 year

 

 

 FIELD OF VIEW (CAMPO DE VISION)
 
Field of view test on three sensors: Apogee Instruments Standard IRT (Model IRTS-S), Apogee Instruments Precision IRT (Model IRTS-P) and Everest Interscience IRT (Model 3000AL).

Estimated FOV for new IRTS-P5 sensor.  Visit this page again soon for updated information.

Gráfica 2: Pinchar sobre la imagen para ampliar

 

 

 


 

Pinchar sobre la imagen para ampliar
 CORRECTING FOR SENSOR BODY TEMPERATURE
 

 

The graphs show the temperature measurement error for the IRR-P, IRR-PN, and IRTS-P using generic and custom coefficients.

 

Gráfica 3: Pinchar sobre la imagen para ampliar

  

 

 

 

 DISEÑO Y CALIBRACION DE LOS RADIOMETROS POR INFRARROJO
 
Introduction of the PDF poster at the right:

"Accurate measurement of leaf to air temperature gradients are crucial for determining incipient water stress and measuring stomatal conductance. This gradient is often less than 1°C, which means that leaf temperature must be known to within about ± 0.1°C. This is a challenging task."

In this poster, we describe design and calibration procedures to achieve this accuracy with an infrared radiometer.


 
 EVALUACION INDEPENDIENTE DE CALIBRACION Y PRECISION
 

 

Derek Pinnock of the Crop Physiology Laboratory at Utah State University (www.usu.edu/cpl) devised a simple test to evaluate the calibration stability and accuracy of our IRTs.   The PDF file (at right) details his procedure and results.
 
 Pinchar sobre la imagen para entrar en el enlace
 
 
            · Solicitar información sobre los productos

 

 

Equipos  Instrumentación  y  Control  S.L.

Urbanización Prado Norte, c/ Fresno  1 – bis  28110 Algete – MADRID

Telf.: 91 628 0817  Fax: 91 628 0453  Email: info@eiccontrol.com

Home | Novedades EIC | Contactar Dpto. Comercial | Solicitar Información| Indice por Productos