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Infrared Temperature Sensor
The Infrared Radiometer measures remote surface temperatures to within 0.2 C.
Measurement of surface temperature is a crucial component of energy transfer. 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 1 C, which means that leaf temperature should be measured to within 0.2 C. To achieve this accuracy, the Apogee Instruments Infrared Radiometers correct for changes in the sensor body temperature with a subroutine designed for Campbell Scientific dataloggers.
The 8-14 µm window of the SI-111 and SI-121 corresponds to the atmospheric window in order to minimise the effects of water bands below 8 µm and above 14 µm.
Select either a standard (SI-111) or narrow (SI-121) field of view. These offer 22˚ and 18˚ half angles, respectively.
Model SI-111 Half-angle = 22.0˚
Model SI-112 Half-angle = 18.0˚