Page 46
Communication Settings
thermoMETER CTVideo
12.5
Basics of Infrared Thermometry
Depending on 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 μ 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 Chap.
13.
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 en-
able 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
- Controller (amplifier/ linearization/ signal processing)
The specifications of the lens decisively determine the optical path of the infrared thermometer, which is char-
acterized 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.
Summary of Contents for thermoMETER CTVideo
Page 6: ...thermoMETER CTVideo...
Page 63: ......
