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.
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 | 40µV/C | 20 µV per C | 40µV/C | 15µV/C | 10 µV per C | 10 µV per C |
Thermistor Input Voltage Requirement | 2500 mV励磁(典型,可使用其他电压) | 2500 mV励磁(典型,可使用其他电压) | 2500 mV励磁(典型,可使用其他电压) | 2500 mV励磁(典型,可使用其他电压) | 2500 mV励磁(典型,可使用其他电压) | 2500 mV励磁(典型,可使用其他电压) | 2500 mV励磁(典型,可使用其他电压) |
模拟输出的热敏电阻 | 0至2500 mV(典型,取决于输入电压) | 0至2500 mV(典型,取决于输入电压) | 0至2500 mV(典型,取决于输入电压) | 0至2500 mV(典型,取决于输入电压) | 0至2500 mV(典型,取决于输入电压) | 0至2500 mV(典型,取决于输入电压) | 0至2500 mV(典型,取决于输入电压) |
Calibration Uncertainty (-30 to 65 C), when target and detector ΔT are < 20 C | 0.2摄氏度 | 0.2摄氏度 | 0.3 C | 0.2摄氏度 | 0.2摄氏度 | 0.2摄氏度 | 0.2摄氏度 |
当目标和探测器ΔT<20 C时,校准不确定度(-40至80 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秒 | 0.2秒 | 0.2秒 |
视野 | 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 |
光谱范围 | 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克 | 190克 | 190克 | 190克 | 190克 | 190克 | 190克 |
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至24 V直流 | 5.5至24 V直流 | 5.5至24 V直流 | 5.5至24 V直流 | 5.5至24 V直流 | 5.5至24 V直流 | 5.5至24 V直流 | 5.5至24 V直流 | 5.5至24 V直流 | 5.5至24 V直流 | 5.5至24 V直流 |
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静止37,激活42 mA |
RS-232 quiescent 37 mA, active 37 mA; RS-485静止37,激活42 mA |
RS-232 quiescent 37 mA, active 37 mA; RS-485静止37,激活42 mA |
RS-232 quiescent 37 mA, active 37 mA; RS-485静止37,激活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摄氏度 | 0.2摄氏度 | 0.3 C | 0.2摄氏度 | 0.3 C | 0.2摄氏度 | 0.2摄氏度 | 0.3 C | 0.2摄氏度 | 0.5 C | 0.5 C |
Calibration Uncertainty (-30 to 65 C), when target and detector ΔT are < 20 C | 0.2摄氏度 | 0.2摄氏度 | 0.3 C | 0.2摄氏度 | 0.3 C | 0.2摄氏度 | 0.2摄氏度 | 0.3 C | 0.2摄氏度 | 0.5 C | - |
当目标和探测器ΔT<20 C时,校准不确定度(-40至80 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 |
视野 | 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 |
光谱范围 | 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克 | 190克 | 190克 | 190克 | 219克 | 190克 | 190克 | 190克 | 190克 | 219克 | 190克 |
Typical applications of infrared radiometers include:
•表型
• Plant canopy temperature measurement for use in plant water status estimation
• Road surface temperature measurement for determination of icing conditions
•能量平衡研究中地面(土壤、植被、水、雪)温度测量
If you would like to share your application of this product, please单击此处.
FOV & Canopy Fraction Calculators
Estimating the Canopy Fraction in Your IR FOV
Excel Sheet programmed to calculate target area
红外SI Radiation Shield: More Information
Horizontal FOV Infrared Radiometer: More Information
Emissivity Correction for Infrared Radiometer Sensors
LoggerNet Short Cut Instructions
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
Programs are in .CR1X format and can be downloaded for use with Campbell Scientific dataloggers. Right click and select "Save target as..." or an equivalent command in your browser. They can also be viewed using Wordpad or other text viewers.
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