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SI-1H1: Horizontal Field of View Infrared Radiometer Sensor

Infrared Radiometers

Product Description

Apogee infrared radiometers are the most accurate non-contact temperature sensors available anywhere. The unique geometry of the SI-1H1 gives a wide 32 degree half angle field of view in the horizontal direction with a 13 degree half angle field of view in the vertical direction. This enables the user to mount the sensor at shallower angles without seeing above the horizon while maximizing the area measured. The sensor has tinned leads for connecting to a datalogger. Applications include measuring the temperatures of road surfaces, plant canopies, and soil, snow and water surfaces. 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.


Approximate Sensitivity:

40 μV per C

Output from Thermistor:

0 to 2500 mV (typical, depends on input voltage)

Input Voltage Requirement:

2500 mV excitation (typical, other voltages can be used)

Calibration Uncertainty (-20 to 65 C):

0.2 C, when target and detector temperature are within 20 C

Calibration Uncertainty (-40 to 80 C):

0.5 C, when target and detector temperature are different by more than 20 C

Measurement Repeatability:

less than 0.05 C

Stability (Long-term Drift):

less than 2 % change in slope per year when germanium filter is maintained in a clean condition

Response Time:

0.2 s

Field of View:

32° horizontal half angle; 13° vertical half angle

Spectral Range:

8 to 14 μm; atmospheric window

Operating Environment:

-55 to 80 C, 0 to 100 % relative humidity (non-condensing)


2.3 cm diameter and 6.0 cm length


190 g (with 5 m of lead wire)


5 m of four conductor, shielded, twisted-pair wire. Additional cable available in multiples of 5 m. Santoprene rubber jacket (high water resistance, high UV stability, flexibility in cold conditions). Pigtail lead wires.

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