Resistance strain gauge is a thing to be tested on the strain change into an electrical signal sensitive device. It is one of the main part of resistance strain sensor. Resistance strain gauge used mostly metal resistance strain gauge and semiconductor strain gauge. Metal resistance strain gauge and filamentous strain gauge and metal foil strain gauge. Usually will strain gauge through the special adhesive agent and adhesive on the produce mechanical strain matrix, when the matrix stress when the stress changes, the resistance strain gauge also together to produce deformation, which changes the resistance strain gauge, to make the change on the resistance of voltage. This strain gauge in force when the resistance changes usually smaller, general this kind of strain gauge of strain bridge, and through the subsequent instrumentation amplifier amplification, then transmitted to processing circuit (usually A/D conversion and CPU) to display or actuators.

It consists of substrate material, metal wire strain or strain foil, insulation protection and lead parts. According to different purposes, the resistance strain gauge resistance value can be designed by the designer, but the scope of resistance should be paid attention to: the resistance value is too small, the drive current is too large, high temperature strain gauge fever led itself at the same time, different environment, the resistance changes of strain gauge is too large, the output zero drift, zero circuit is too complex. The resistance is too large, the impedance is too high, poor ability to resist external electromagnetic interference. Generally are dozens of Europe to tens of thousand around Europe.