Path sensors, linear magnetostrictive

Magnetostrictive path sensors measure contactlessly and, thus, wear-free.They are resistant to shock and vibration. Magnetostrictive path sensors are absolute measuring sensors; after being switched on, the position information is immediately available. Positioning accuracies in the low µm range can be achieved. How it works:
A copper conductor is led through a waveguide. The waveguide is made of ferromagnetic material which elastically deforms lengthwise when exposed to a magnetic field (magnetostrictive effect). There is a copper wire inside of the waveguide. A magnetic field is produced by short current pulses; this magnetic field is focused in the waveguide. A permanent magnet, which also generates a magnetic field, is the position encoder. The magnetic field of the waveguide and of the position encoder overlap one another. At the location of the position encoder magnet, the waveguide tube deforms in the direction of the resulting magnetic field and produces a structure-borne sound wave. At the end of the waveguide, the structure-borne sound wave is converted to an electrical signal by an induction coil.The distance between the position encoder and the induction coil is determined by means of the time difference between the propagation time of the structure-borne sound wave in the waveguide and the electrical excitation pulse.

Application reports on the subject of linear magnetostrictive path sensors
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