These transducers are for displacement / position measurement. They make an accurate position measurement of the movement of the armature (the sliding part) relative to the body of the displacement transducer.
The LIN differential-inductance LVDTs are inductive (similar to an LVDT sensor) and because there is no contact across the sensor element it is very robust. The LVDTs are available as either unguided or spring return versions.
This sensor is appropriate for high temperature, high pressure and high nuclear radiation position measurement applications. Many applications in turbines, in nuclear power stations and in research labs are appropriate for this sensor.