Basics Of Infrared Thermometry - B+B Sensors DM-Compact Series Operating Manual

OPEARTING MANUAL
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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 (►10 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
 Electronic (Amplification/ Linearisation / Signal Processing)
The specifications of the lens decisively determine the optical path of the infrared thermometer, which is characterized by the ratio Distance to Spot
size.
The spectral filter selects the wavelength range, which is relevant for the temperature measurement. The detector in cooperation with the
processing electronics transforms the emitted infrared radiation into electrical signals.
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