Principle of magnetostrictive linear displacement sensor

Principle of magnetostrictive linear displacement sensor

The magnetostrictive linear displacement (liquid level) transmitter is mainly composed of a measuring rod, an electronic silo and a non-contact magnetic ring (floating ball) on the measuring rod. The measuring rod is equipped with magnetostriction wire (waveguide wire).

During operation, an initial pulse is generated by the electronic circuit in the electron chamber. The initial pulse is transmitted in the waveguide wire and a rotating magnetic field is generated along the direction of the waveguide wire.

When this magnetic field meets the permanent magnetic field in the magnetic ring (floating ball), the magnetostriction effect causes the waveguide wire to wiggle, producing a wiggle pulse (or "return" pulse).

This wiggle pulse is sensed and converted into the corresponding current pulse by the energy pickup device installed in the electronic chamber. The time difference between the start and return of the two pulses can be calculated by the electronic circuit, and the measured position and displacement can be accurately measured.