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| The function principle | Thermopiles are multiple thermocouples which use the Seebeck effect. A thermocouple is created with two, conducting materials which are connected at one point called a hot junction. If a temperature difference is induced between the hot junction and the open ends (cold junctions) a voltage is created between both ends of the thermocouple. By lining up the thermocouples a voltage of several mV can be generated.
For contactless temperature measurement, the increase of temperature of the hot junctions is created by the absorption of infrared radiation. Infrared radiation is emitted by every object and its power is increasing with increasing surface temperatures. Based on this relation, Thermopiles measure the emitted power and determine the object`s temperature precisely.
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