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Working principle of temperature sensor

Working principle of temperature sensor


The temperature sensor is to measure the temperature in the air through a certain detection device, after measuring the temperature, according to a certain rule into electrical signals or other required forms of information output, to meet the needs of users. So, how does the temperature sensor work?

A sensor designed on the principle of metal expansion

The metal will produce a corresponding extension when the ambient temperature changes, so the sensor can convert the signal of this reaction in different ways.

Bimetal chip sensor

The bimetallic sheet is composed of two pieces of metal with different expansion coefficients. With the change of temperature, material a has a higher expansion degree than another metal, which causes the sheet to bend. The curvature of the bend can be converted into an output signal.

Bimetal rod and tube sensors

With the increase of temperature, the length of metal tube (material a) increases, while the length of nonexpansion steel rod (metal b) does not increase, so the linear expansion of metal tube can be transmitted due to the change of position. In turn, this linear expansion can be converted into an output signal.

Sensor for the design of deformation curve of liquid and gas

When the temperature changes, the volume of liquid and gas will change accordingly.

A variety of structures can transform this expansion change into a position change, thus generating a position change output (potentiometer, inductive deviation, baffle, etc.).

Resistance sensor

The resistance of metal changes with temperature. For different metals, the change of resistance value is different for each degree of temperature change, and the resistance value can be used as the output signal directly.

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