LVDT Type Extensometer
Extensometers measure strain, the change in length of a specimen divided by the original length (gauge length) of the specimen, by means of knife edges that contact the sample, one of which is fixed in position and the other located on a moveable arm.
On these models, the moveable arm is pivoted – the knife edge is at one end and the other end is attached to an armature that moves through an LVDT coil.
Most of these extensometers can be adapted to exact specimen holding needs by the options that are described below, but in their standard form hold flat or round specimens from 1.6 to 16mm (1/16 to 5/8in).
