7 Basics of Infrared Thermometry
Depending on the temperature each object emits a certain amount of infrared radiation. A change in the
temperature of the object is accompanied by a change in the intensity of the radiation. For the
measurement of “thermal radiation” infrared thermometry uses a wave-length ranging between 1 µm and
20 µm.
The intensity of the emitted radiation depends on the material. This material contingent constant is
described with the help of the emissivity which is a known value for most materials (see enclosed table
emissivity).
Infrared thermometers are optoelectronic sensors. They calculate the surface temperature on the basis of
the emitted infrared radiation from an object. The most important feature of infrared thermometers is that
they enable the user to measure objects contactless. Consequently, these products help to measure the
temperature of inaccessible or moving objects without difficulties. Infrared thermometers basically consist
of the following components:
• lens
• spectral filter
• detector
• electronics (amplifier/ linearization/ signal processing)
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