Within our daily life all bodies give off radiation or electromagnetic waves dependant upon their temperature. Energy is transported during this dispersion of radiation and this energy allows us to use radiation as a measurement for body temperature without actual contact. This can be done because the energy & Its characteristic wavelengths are dependant on the temperature.
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Advantages of Infrared measuring technology
This method of temperature measuring allows simple recording of fast dynamic processes. This is helped by the short reaction times of the sensors and systems. This method also has no influence on the object being measured, which enables you to take measurements on sensitive surfaces or sterile products. It is also good for measuring hazardous points or places that are difficult to access.
Infrared thermometers are very good at measuring temperatures for poor heat conductors such as plastics, ceramics and rubber. Determining the temperature of gears, housing and bearing in both large and small motors or for moving parts such as sheet metal tracks. It is also good for parts that cannot be touched such as freshly painted parts or corrosive substances or very small or very large areas.
However non contact measuring can have its problems, The composition of the transmission path of the object and the instrument may have an effect on the measured result. Disturbance variable may include dust or dirt particles, moisture (rain, Steam & Gases). So you should only measure when there are no disturbing variables.
There are several things to remember when using infrared thermometers: