Single Supply Temperature Sensing with Thermocouples
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چکیده
Thermocouples are constructed of two dissimilar metals such as Chromel and Constantan (Type E) or Nicrosil and Nisil (Type N). The two dissimilar metals are bonded together on one end of both wires with a weld bead. This bead is exposed to the thermal environment of interest. If there is a temperature difference between the bead and the other end of the thermocouple wires, a voltage will appear between the two wires at the end where the wires are not soldered together. This voltage is commonly called the thermocouple’s Electromotive Force (EMF) voltage. This EMF voltage changes with temperature without any current or voltage excitation. If the difference in temperature between the two ends (the weld bead versus the unsoldered ends) of the thermocouple changes, the EMF voltage will change as well.
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