Apogee Infrared Radiometers

An infrared thermometer measures radiant energy. This radiation is simply “light” that is slightly outside the human eye’s sensitive range. All objects radiate infrared energy. The intensity of infrared radiation is proportional to the absolute temperature (°K Kelvin) of the object. Infrared thermometers produce no “intrusion error.” A hot object “target” is radiating its infrared radiation in all directions. The object’s radiation characteristics, and hence its temperature, are not disturbed by the presence of the infrared thermometer. The infrared thermometer optics collect a sample of infrared radiation from the hot object (soil & plant) being measured and focus it on the tiny infrared detector. The detector, in turn, converts it to a proportional electrical signal, which is the exact electrical analogue of the incoming infrared radiation, and hence the hot object’s temperature. This minute electrical signal is then amplified, converted to a digital signal, and digitally linearised and the resultant temperature either displayed or data logged. Low temperature infrared thermometry (IRT) is technically quite difficult especially when measuring temperatures of crop canopies which have a very weak infrared signal and temperatures are needed to be resolved to 0.1 Deg C to make meaningful irrigation and management decisions. Continuous measurement of the transducer temperature and sky reflectance of infrared light must be undertaken.

Specification

Field of View Details

Field of view and Output combinations

*CG denotes Commercial Grade, RG denotes Research Grade.

Full technical specifications can be found on the Apogee Instruments Website

Accessories:

Details on the following accessories can be found on the Apogee Accessories page:

• AM-220 Mounting bracket for the Apogee Research-Grade Infrared System
• AM-250 Commercial Infrared Radiometer Mounting Bracket, to mount the commercial infrared radiometer to poles or posts for accurate measurements.