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Infrared Radiometer Support

Infrared Radiometer Support

Introduction
Specifications
Videos
Case Studies
Product Manuals
Spec Sheets
Technical Drawings
Helpful Articles & Links
FAQs
Software & Datalogger Programs
Recalibration & Repair

 

Infrared Radiometer Introduction

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensity of radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies, water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 µm).

Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperature without touching the surface (when using sensors that must be in contact with the surface, it can be difficult to maintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infrared thermometers because temperature is the desire quantity, even though the sensors detect radiation.

Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precision thermistor (for detector reference temperature measurement), and signal processing circuitry mounted in an anodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers also come with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation. The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of the radiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designed for continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments.

 

Infrared Radiometer Specifications
Apogee Instruments Infrared Radiometer Specifications
Analog Models
  SI-111-SS SI-121-SS SI-131-SS SI-1H1-SS SIF-111-SS SIF-121-SS SIF-1H1-SS
Analog Model Output (Difference between Target and Detector) 60 µV per C 40 µV per C 20 µV per C 40 µV per C 15 µV per C 10 µV per C 10 µV per C
Thermistor Input Voltage Requirement 2500 mV excitation (typical, other voltages can be used) 2500 mV excitation (typical, other voltages can be used) 2500 mV excitation (typical, other voltages can be used) 2500 mV excitation (typical, other voltages can be used) 2500 mV excitation (typical, other voltages can be used) 2500 mV excitation (typical, other voltages can be used) 2500 mV excitation (typical, other voltages can be used)
Analog Output from Thermistor 0 to 2500 mV (typical, depends on input voltage) 0 to 2500 mV (typical, depends on input voltage) 0 to 2500 mV (typical, depends on input voltage) 0 to 2500 mV (typical, depends on input voltage) 0 to 2500 mV (typical, depends on input voltage) 0 to 2500 mV (typical, depends on input voltage) 0 to 2500 mV (typical, depends on input voltage)
Calibration Uncertainty (-30 to 65 C), when target and detector ΔT are < 20 C 0.2 C 0.2 C 0.3 C 0.2 C 0.2 C 0.2 C 0.2 C
Calibration Uncertainty (-40 to 80 C), when target and detector ΔT are < 20 C 0.5 C 0.5 C 0.6 C 0.5 C 0.5 C 0.5 C 0.5 C
Measurement Repeatability Less than 0.05 C Less than 0.05 C Less than 0.05 C Less than 0.05 C Less than 0.05 C Less than 0.05 C Less than 0.05 C
Response Time (time for detector signal to reach 95 % following a step change) 0.6 s 0.6 s 0.6 s 0.6 s 0.2 s 0.2 s 0.2 s
Field of View 22° half-angle 18° half-angle 14° half-angle 32° horizontal half-angle, 13° vertical half-angle 22° half-angle 18° half-angle 32° horizontal half-angle, 13° vertical half-angle
Spectral Range 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window
Operating Environment -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing)
Mass 190 g 190 g 190 g 190 g 190 g 190 g 190 g
Digital Models
  SI-411-SS SI-421-SS SI-431-SS SI-4H1-SS SI-4HR-SS SI-511-SS SI-521-SS SI-531-SS SI-5H1-SS SI-5HR-SS SIL-411
Digital Input Voltage Requirement 5.5 to 24 V DC 5.5 to 24 V DC 5.5 to 24 V DC 5.5 to 24 V DC 5.5 to 24 V DC 5.5 to 24 V DC 5.5 to 24 V DC 5.5 to 24 V DC 5.5 to 24 V DC 5.5 to 24 V DC 5.5 to 24 V DC
Average Current Draw 1.5 mA (quiescent), 2.0 mA (active) 1.5 mA (quiescent), 2.0 mA (active) 1.5 mA (quiescent), 2.0 mA (active) 1.5 mA (quiescent), 2.0 mA (active) 1.5 mA (quiescent), 2.0 mA (active) RS-232 quiescent 37 mA, active 37 mA;
RS-485 quiescent 37, active 42 mA
RS-232 quiescent 37 mA, active 37 mA;
RS-485 quiescent 37, active 42 mA
RS-232 quiescent 37 mA, active 37 mA;
RS-485 quiescent 37, active 42 mA
RS-232 quiescent 37 mA, active 37 mA;
RS-485 quiescent 37, active 42 mA
RS-232 quiescent 29 mA;
RS-485 30 mA
1.5 mA (quiescent), 2.0 mA (active)
Calibration Uncertainty (0 to 50 C), when target and detector ΔT are < 20 C 0.2 C 0.2 C 0.3 C 0.2 C 0.3 C 0.2 C 0.2 C 0.3 C 0.2 C 0.5 C 0.5 C
Calibration Uncertainty (-30 to 65 C), when target and detector ΔT are < 20 C 0.2 C 0.2 C 0.3 C 0.2 C 0.3 C 0.2 C 0.2 C 0.3 C 0.2 C 0.5 C -
Calibration Uncertainty (-40 to 80 C), when target and detector ΔT are < 20 C 0.5 C 0.5 C 0.6 C 0.5 C 0.5 C 0.5 C 0.5 C 0.6 C 0.5 C 1 C -
Measurement Repeatability Less than 0.05 C Less than 0.05 C Less than 0.05 C Less than 0.05 C Less than 0.05 C Less than 0.05 C Less than 0.05 C Less than 0.05 C Less than 0.05 C Less than 0.05 C Less than 0.05 C
Response Time (time for detector signal to reach 95 % following a step change) 0.6 s 0.6 s 0.6 s 0.6 s 0.6 s - - - - - 0.6 s
Field of View 22° half-angle 18° half-angle 14° half-angle 32° horizontal half-angle, 13° vertical half-angle 16° horizontal half-angle, 5° vertical half-angle 22° half-angle 18° half-angle 14° half-angle 32° horizontal half-angle, 13° vertical half-angle 16° horizontal half-angle, 5° vertical half-angle 22° half-angle
Spectral Range 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window 8 to 14 µm atmospheric window
Operating Environment -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing) -50 to 80 C, 0 to 100 % relative humidity (non-condensing)
Mass (with 5 m of cable) 190 g 190 g 190 g 190 g 219 g 190 g 190 g 190 g 190 g 219 g 190 g

 

Infrared Radiometer Videos
Apogee Instruments Infrared Radiometer Videos

How to Choose an Infrared Radiometer

If you can't access the video via Youtube, click here.

Brief Overview of Infrared Radiometers

If you can't access the video via Youtube, click here.

Infrared Radiometer

If you can't access the video via Youtube, click here.

Principles of Surface Temperature Measurement

If you can't access the video via Youtube, click here.

Using Infrared Radiometers for Plant Science Research

If you can't access the video via Youtube, click here.

Lecture 2-Infrared Surface Temperature

 

Infrared Radiometer Case Studies
Apogee Instruments Infrared Radiometer Case Studies
Typical Applications

Typical applications of infrared radiometers include:

• Phenotyping

• Plant canopy temperature measurement for use in plant water status estimation

• Road surface temperature measurement for determination of icing conditions

• Terrestrial surface (soil, vegetation, water, snow) temperature measurement in energy balance studies

Aridea Solutions Fever Screening Kit
Aridea Solutions Fever Screening Kit
Apogee Instruments' Infrared Radiometers are used for fever screening during the COVID-19 pandemic.
Read More >
PDF >
Apogee in Space
Apogee in Space
Apogee Infrared Radiometers were recently used in the International Space Station's Advanced Plant Habitat (APH) project to measure the canopy temperature of dwarf Apogee wheat meant for use in space travel.
Read More >
PDF >
Robot Vineyard Monitoring with Apogee Infrared Radiometer
Robot Vineyard Monitoring with Apogee Infrared Radiometer
Autonomous vineyard monitoring robots use Apogee Instruments' SI-411 infrared radiometer to generate maps of temperature and vigor of the plants in real time.
Read More >
PDF >
Crop Yield and Temperature (USDA-ARS)
Crop Yield and Temperature (USDA-ARS)
MI-2H0 infrared radiometer is used by breeders and physiologists as they continue to seek phenotypic and genetic markers that are easy to measure and help predict yield.
Read More >
PDF >
High Throughput Field Phenotyping Multi-sensor System
High Throughput Field Phenotyping Multi-sensor System
Infrared radiometer measures canopy temperature on a multi-sensor system for high throughput field phenotyping in soybean and wheat breeding.
Read More >
PDF >
Weather Information Service Engine Project (WISE)
Weather Information Service Engine Project (WISE)
Autonomous vineyard monitoring robots use Apogee Instruments' SI-411 infrared radiometer to generate maps of temperature and vigor of the plants in real time.
Read More >
PDF >
Temperature Free-Air Controlled Enhancement T-FACE
Temperature Free-Air Controlled Enhancement T-FACE
Simulating warmer conditions by applying a heat treatment to open-field plant canopies. Infrared radiometers provide the data and control the heated plot temperatures.
Read More >
PDF >
Hydrology
Hydrology
Measuring ground surface temperature to measure snow runoff.
Read More >
PDF >
Forecasting Ice Formations
Forecasting Ice Formations
Forecasting ice formation on road surfaces using infrared radiometers on a mobile system.
Read More >
PDF >
Colombia Rose Fungus Study
Colombia Rose Fungus Study
Studying conditions that cause fungus growth on roses.
Read More >
PDF >
Crop Water Stress Index
Crop Water Stress Index
Using infrared radiometers to determine water schedule for plants.
Read More >
PDF >
Oklahoma Mesonet
Oklahoma Mesonet
Measuring the temperature of the interface between the earth's surface and its atmosphere on automated meteorological networks spaced evenly across Oklahoma.
Read More >
PDF >

If you would like to share your application of this product, please click here.

 

Infrared Radiometer Product Manuals
Apogee Instruments Infrared Radiometer Product Manuals
SI-111-SS
SI-121-SS
SI-131-SS
SI-1H1-SS
SI-411-SS
SI-421-SS
SI-431-SS
SI-4H1-SS
SI-4HR-SS
SIL-411
SI-511-SS
SI-521-SS
SI-531-SS
SI-5H1-SS
SI-5HR-SS
SIF-111-SS
SIF-121-SS
SIF-1H1-SS
MI-210
MI-220
MI-230
MI-2H0

 

Infrared Radiometer Specification Sheets
Apogee Instruments Infrared Radiometer Specification Sheets
SI-111-SS
SI-121-SS
SI-131-SS
SI-1H1-SS
SI-411-SS
SI-421-SS
SI-431-SS
SI-4H1-SS
SI-4HR-SS
SIL-411
SI-511-SS
SI-521-SS
SI-531-SS
SI-5H1-SS
SI-5HR-SS
SIF-111-SS
SIF-121-SS
SIF-1H1-SS
MI-210
MI-220
MI-230
MI-2H0

 

Infrared Radiometer Technical Drawings
Apogee Instruments Infrared Radiometer Technical Drawings
SI-111-SS
SI-121-SS
SI-131-SS
SI-1H1-SS
SI-411-SS
SI-421-SS
SI-431-SS
SI-4H1-SS
SI-4HR-SS
SIL-411
SI-511-SS
SI-521-SS
SI-531-SS
SI-5H1-SS
SI-5HR-SS
SIF-111-SS
SIF-121-SS
SIF-1H1-SS
MI-210
MI-220
MI-230
MI-2H0

 

  Helpful Articles and Links

   Field of View (FOV) Explained

   FOV & Canopy Fraction Calculators

   Estimating the Canopy Fraction in Your IR FOV

   Excel Sheet programmed to calculate target area

   Design and Calibration of Infrared Radiometer

   IR SI Radiation Shield: More Information

   Horizontal FOV Infrared Radiometer: More Information

   Apogee Meter Tips and Troubleshooting

   Protecting Your Instruments from Spiders, Wasps, and Other Pests

   Emissivity Correction for Infrared Radiometer Sensors

   LoggerNet Short Cut Instructions

   How to take IR Temperature Measurements without a Datalogger

   Minimize Losses from Frost Using Direct Measurements - Campbell Scientific Blog Post

   Using Infrared Thermometers for Plant Science Research

   Infrared Thermometers for Monitoring Plant Temperatures in Greenhouses

 

 FAQs
For FAQs Click Here

 

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Apogee Instruments SI-111 Standard Field of View Infrared Radiometer
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SI-111-SS: Research-Grade Standard Field of View Infrared Radiometer Sensor

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Apogee Instruments SI-121 Narrow Field of View Infrared Radiometer
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SI-121-SS: Research-Grade Narrow Field of View Infrared Radiometer Sensor

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Apogee Instruments SI-131 Ultra-narrow Field of View Infrared Radiometer
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SI-131-SS: Research-Grade Ultra-Narrow Field of View Infrared Radiometer Sensor

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Apogee Instruments SI-1H1 Horizontal Field of View Infrared Radiometer
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SI-1H1-SS: Research-Grade Horizontal Field of View Infrared Radiometer Sensor

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Apogee Instruments SI-411 SDI-12 Digital Output Standard Field of View Infrared Radiometer
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SI-411-SS: Research-Grade SDI-12 Digital Output Standard Field of View Infrared Radiometer Sensor

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Apogee Instruments SI-421 SDI-12 Output Narrow Field of View Infrared Radiometer
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SI-421-SS: Research-Grade SDI-12 Digital Output Narrow Field of View Infrared Radiometer Sensor

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Apogee Instruments SI-431 SDI-12 Digital Output Ultra-narrow Field of View Infrared Radiometer
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SI-431-SS: Research-Grade SDI-12 Digital Output Ultra-Narrow Field of View Infrared Radiometer Sensor

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Apogee Instruments SI-4H1 Digital Output Horizontal Field of View Infrared Radiometer
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SI-4H1-SS: Research-Grade SDI-12 Digital Output Horizontal Field of View Infrared Radiometer Sensor

$789.00
SI-411 StanSI-4HR: SDI-12 Digital Output Horizontal Field of View Infrared Radiometer Sensordard Field of View Close Up
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SI-4HR-SS: Research-Grade SDI-12 Road Surface Infrared Radiometer Sensor

$889.00
SI-511-SS: Research-Grade Modbus Digital Output Standard Field of View Infrared Radiometer Sensor
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SI-511-SS: Research-Grade Modbus Digital Output Standard Field of View Infrared Radiometer Sensor

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SI-521-SS: Research-Grade Modbus  Digital Output Narrow Field of View Infrared Radiometer Sensor
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SI-521-SS: Research-Grade Modbus Digital Output Narrow Field of View Infrared Radiometer Sensor

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SI-531-SS: Research-Grade Modbus Digital Output Ultra-Narrow Field of View Infrared Radiometer Sensor
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SI-531-SS: Research-Grade Modbus Digital Output Ultra-Narrow Field of View Infrared Radiometer Sensor

$789.00
SI-5H1-SS: Research-Grade Modbus Digital Output Horizontal Field of View Infrared Radiometer Sensor
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SI-5H1-SS: Research-Grade Modbus Digital Output Horizontal Field of View Infrared Radiometer Sensor

$789.00
SI-5HR-SS: Research-Grade Modbus Road Surface Infrared Radiometer Sensor
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SI-5HR-SS: Research-Grade Modbus Road Surface Infrared Radiometer Sensor

$789.00
SIF-111 Fast Response, Standard Field of View Infrared Radiometer
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SIF-111-SS: Research-Grade High Speed, Standard Field of View Infrared Radiometer

$689.00
SIF-121 Fast Response, Narrow Field of View Infrared Radiometer
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SIF-121-SS: Research-Grade High Speed, Narrow Field of View Infrared Radiometer

$689.00
SIF-1H1 Fast Response, Horizontal Field of View Infrared Radiometer
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SIF-1H1-SS: Research-Grade High Speed, Horizontal Field of View Infrared Radiometer

$689.00
SIL-411: Commercial-Grade SDI-12 Digital Output Standard Field of View Infrared Radiometer Sensor
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SIL-411: Commercial-Grade SDI-12 Digital Output Standard Field of View Infrared Radiometer Sensor

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MI-210 Standard Field of View Infrared Radiometer with Handheld Meter
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MI-210: Research-Grade Standard Field of View Infrared Radiometer with Handheld Meter

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AM-250: Angle Commercial-Grade Infrared Radiometer Mounting Bracket
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AM-250: Angle Commercial-Grade Infrared Radiometer Mounting Bracket

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    • Pyrgeometers
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    • Leaf and Bud Temperature Sensor
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