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A Sensor Designed On The Principle Of Metal Expansion
Sep 17, 2018

The metal produces a corresponding extension when the ambient temperature changes, so the sensor can signal the reaction in different ways.


Bimetal sensor


The bimetal sheet consists of two pieces of metal with different expansion coefficients. As the temperature changes, material A expands more than another metal, causing the sheet to bend. Curved curvature can be converted into an output signal.


Bimetal bar and metal tube sensor


As the temperature increases, the length of the metal tube (material A) increases, while the length of the non-expansion steel bar (metal B) does not, so that the linear expansion of the metal tube can be transmitted as A result of the change in position. In turn, this linear expansion can be converted into an output signal.


A sensor designed for the deformation curve of liquid and gas


Liquid and gas also produce volume changes in response to temperature changes.


Various types of structures can convert this expansion into a change in position, thus producing a change in position output (potentiometer, induction bias, baffle plate, etc.).