DISTANCE SENSORS UTILIZING LARGE BARKHAUSEN EFFECT EXCITED BY WIRE CURRENT PULSE-TRAIN IN TWISTED AMORPHOUS MAGNETOSTRICTIVE WIRES

A new distance sensor utilizing a stepwise domain wall propagation cau sed by a pulse wire current train in a twisted magnetostrictive amorph ous wire is presented. A 1000 mm-long digital distance sensor having a nonlinearity of 0.5 %FS and a simple construction is realized. The se nsor characteristics are controlled with applying a torsion. The stepw ise domain wall propagation characteristics are also anlyzed in compar ison with those for a steady state wall propagation.