What is a thermocouple and how does it work? A thermocouple is a sensor used to measure temperature. Thermocouples are made with two wires of different metals, joined together at one end to form a junction. Here's your answer in under 1 minute!
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The junction is placed on the surface or in the environment that's being measured. As the temperature changes, the two dissimilar metals begin to deform, causing a change in resistance. Naturally, a thermocouple outputs a millivolt signal, therefore, as the resistance changes, the change in voltage can be measured. Thermocouples are desirable because they're extremely low cost, simple to use, and are capable of providing accurate readings.