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Strain gauges, mounted on an object, measure deformation (elongation, contraction, etc.) caused by applied forces. This deformation alters the gauge's electrical resistance, allowing measurement of tensile, compressive, bending, torsional, and shear stresses, even minute ones. Primarily used in load cells – force/pressure transducers converting mechanical load into electronic signals – they're crucial in weight measurement, automation, process control, biomechanics, equipment/building monitoring, and quality control. Modern load cells often employ multiple gauges for increased accuracy. This technology, advanced by William Thomson in 1856, relies on the strain gauge factor (Gf), a proportionality constant relating resistance change to strain.

The process of using strain gauges begins by mounting them on an object to be tested.
When force is applied, the strain gauge detects the resulting deformation, such as elongation, contraction, or other changes caused by compressive or tensile forces. These deformations cause measurable changes in the gauge's electrical resistance. Strain gauges can measure various stresses, including tensile, compressive, bending, torsional, and shear stresses, and are highly sensitive to even small variations in resistance.
Strain gauges are primarily used in load cells, which are force and pressure transducers
that convert mechanical load into readable electronic signals. Strain gauge load cells are common in weight measurement, but they also have applications in automation, process control, biomechanics, equipment monitoring, building integrity assessments, and quality control. Modern load cells often use multiple strain gauges for greater accuracy. This technology was advanced by William Thomson in 1856. strain gauge factor GfG_fGf , which is defined as the amount by which the resistance changes is directly proportional to the strain and gives as :