Principle of resistance strain gauge of pressure sensor

Create Date: 2024-8-30 12:03:23|Source: TURCK/TURCK

The operating principle of metal resistance strain gauge is the phenomenon that the resistance value changes due to mechanical deformation due to the strain resistance adsorbed on the matrix data, which is commonly known as the resistance strain effect. The resistance value of a metal conductor can be indicated by the following formula:

                               Principle of resistance strain gauge of pressure sensor

where: ρ--resistivity of metal conductor (Ω·cm2/m)

S--Cross-sectional area of conductor (cm2)

L--Length of conductor (m)

We take the wire strain resistance as an example, when the wire is subjected to external force, its length and cross-sectional area will change, from the above equation it is easy to see that its resistance value will change, if the wire is elongated by external force, its length increases, and the cross-sectional area decreases, the resistance value will increase. When the wire is compressed by an external force, the length decreases and the cross-section increases, and the resistance value decreases. The strain of the strain wire can be obtained by simply measuring the change in the resistance (usually measuring the voltage at both ends of the resistor).

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