The working principle of the resistance strain gauge is based on the strain effect, that is, when the conductor or semiconductor material is mechanically deformed under the action of external forces, its resistance value changes correspondingly, which is called the "strain effect".
The semiconductor strain gauge is made of semiconductor material, and its working principle is based on the piezoresistive effect of semiconductor material. Piezoresistive effect refers to the phenomenon that the resistivity of a semiconductor material changes when an axial force acts on it.
The strain gauge is composed of the sensitive grid and other components used to measure the strain, when it is firmly pasted on the measuring point of the component, the component is stressed due to the strain of the measuring point, the sensitive grid will also deform and make its resistance change, and then the resistance change is measured by the special instrument, and converted to the strain value of the measuring point.
There are many kinds of metal resistance strain gauges, various forms, common wire resistance strain gauges and foil resistance strain gauges.
Foil resistance strain gauge is a kind of sensitive element based on strain-resistance effect, which uses metal foil as a sensitive gate and can convert the strain variable of the tested part into the resistance change.
