Linear displacement transducers are linear sensors that work on the magnetostrictive principle, whereby a torsional strain pulse is induced in a specially designed magnetostrictive waveguide by the momentary interaction of two magnetic fields. The interaction between these two magnetic fields (one from the moving magnet and one passing along the outside of the transducer) produces a strain pulse which travels at sonic speed along the sensor waveguide until the pulse is detected at the head of the transducer where the electronics are embedded.
The position of the moving magnet is precisely determined by measuring the elapsed time between the current pulse and the arrival of the strain pulse, resulting in a position measurement system that is capable of providing an accurate and repeatable incremental or absolute measurement. Linear displacement sensors feature multi magnet function that can detect multiple positions simultaneously and support variety of fieldbus formats (SSI, CANBus, DeviceNet, Profibus, etc.).