Optical extensometers - Laser extensometer
Deformation measurement with the laser extensometer
The non-contact linear expansion measurement allows the automatic determination of the initial gauge length (L0). The optical system does not influence the measurement with knife edges or its own weight. Laser and video extensometers are used.
The laser extensometer is used for non-contact measurement of strain or compression of test specimens under uniaxial load. Two measuring marks are applied to the sample before the test. The laser extensometer scans the measuring range with a visible laser beam and automatically determines the reference length. The positions of the measuring marks are recorded throughout the test. The software calculates the length change and elongation from the temporal progression.