strækningsmålere

Strækningsmålere, also known as strain gauges, are sensors used to measure the deformation of an object under stress. They work by converting mechanical strain into an electrical signal. The most common type of strain gauge consists of a thin, metallic foil or wire arranged in a grid pattern on a flexible backing. When the object to which the strain gauge is attached is stretched or compressed, the foil or wire also deforms. This deformation changes the electrical resistance of the foil or wire.

The relationship between strain and resistance change is linear within a certain range. By measuring the change in resistance, the amount of strain can be accurately determined. This is typically done using a Wheatstone bridge circuit, which is highly sensitive to small changes in resistance. The output from the Wheatstone bridge is then amplified and conditioned to provide a usable electrical signal that can be read by data acquisition systems or displayed on a meter.

Strækningsmålere find wide application in various fields, including structural monitoring, aerospace engineering, automotive testing, and material science. They are used to assess the load-bearing capacity of structures, monitor the performance of components under stress, and conduct research into material properties. Their ability to provide precise and real-time measurements of strain makes them invaluable tools for engineers and researchers. Different types of strain gauges exist, including semiconductor strain gauges which offer higher sensitivity but are more susceptible to temperature variations.