Sträckgivare

Sträckgivare, often translated as strain gauge, is a sensor whose electrical resistance changes in proportion to the amount of strain applied to it. When a strain gauge is attached to an object, and that object is subjected to mechanical stress, it deforms, stretching or compressing the strain gauge. This deformation alters the gauge's length and cross-sectional area, which in turn affects its electrical resistance. By measuring this change in resistance, one can determine the amount of strain experienced by the object.

Strain gauges are typically made of a thin, flexible foil patterned into a grid-like shape. This pattern maximizes the change in resistance for a given strain. They are bonded to the surface of the object being measured using a special adhesive. The relationship between strain and the change in resistance is quantified by the gauge factor, a property specific to the strain gauge material.

The primary applications of strain gauges are in measuring deformation and stress in mechanical components, structures, and materials. They are fundamental components in load cells for weighing systems, pressure sensors, accelerometers, and torque sensors. Their ability to provide precise and localized strain measurements makes them invaluable in engineering, manufacturing, and scientific research for structural analysis, quality control, and experimental testing.