The Thermocouple is a sensor that measures temperature. A thermocouple, also called a thermocouple, a thermoelectric thermometer or thermometer, is a temperature measuring device made of two wires of different metals connected at each end.


A thermocouple (also called a thermistor) is a sensitive thermocouple with two dissimilar conductors, usually gold or some other metal, forming an electronic junction. It creates a temperature-dependent current through the Seebeck Effect, and this current is interpreted to read temperature by the user.

A thermopile is an electrical device made up of two different electrical conductors that make electrical connections. The Thermocouple produces a temperature-dependent voltage due to the Seeback effect, and this voltage can also be interpreted as a measure of temperature.

Thermocouples are commonly used in various uses due to their wide range of models and specifications, the correct type for any application, and the better identification of thermocouple materials. It is important to understand its infrastructure, functions, and limitations.

Working Principle Of Thermocouple

The working principle of a thermocouple is based on the Seeback effect. This effect is when a closed circuit is formed by joining two dissimilar metals in two joints, and the joints are maintained at different temperatures. An electromotive force (EMF) is induced in that closed circuit.

This type of effect occurs between two dissimilar metals. When heat is applied to any of the metal wires, the flow of electrons goes from the hot metal wire to the cold one. Hence, direct current stimulates the circuit.

It is a phenomenon in which a temperature difference between two different metals causes a potential difference. The See-Beck effect creates small stresses per degree Kelvin of temperature.

Thermocouples Uses

Thermocouples are commonly used in biomedical applications such as cardiac monitoring and blood flow monitors. It is used in medical thermography, where they provide quantitative information on the temperature of patients. In electronics, a thermocouple provides a means to interface between different electronic components without a wire.

With its low cost and flexibility, thermocouple finds wide application in many applications. However, in electronics, its use is limited to using in low power systems and low-temperature environments. Thermocouples are used in microprocessors for controlling currents and temperatures.

The process can be started at room temperature and increased until an appropriate temperature is reached. This is called a controlled temperature rise. When a thermocouple device reaches its limit of holding a constant temperature, its behavior changes abruptly and starts displaying unusual behavior like jump, slippage, or even oscillation.
Such abrupt changes in thermal behavior are generally caused by thermal drift and temperature instability

You can also read about the Pyrometer

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