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DISPLACEMENT SENSORS USING MAGNETOSTRICTIVE DELAY LINES

V. Karagiannis1,* , C. Manassis1, D. Bargiotas1

Affiliation

  1. Electrical Engineering Department, TEI of Chalkis, Psahna, Euboea 34400 Greece

Abstract

In this paper, we present further results in displacement sensors based on magnetostrictive delay lines using amorphous ribbons in the as cast form after stress relief and after stress current annealing. The elastic pulse generated due to pulsed current transmitted through an excitation coil is detected by means of a search coil as a pulsed voltage output. NdFeB permanent magnets in a form of pellet have been tested, having a magnetic anisotropy parallel to their axis. Experimental results obtained by displacing the magnets parallel and vertical to the delay line indicate monotonic response, thus allowing repeatable displacement sensing in three dimensions using proper arrangements. The MDL response was improved after stress relief and stress current annealing..

Keywords

Displacement sensor, Magnetostrictive delay lines, Amorphous ribbons, Stress current annealing.

Submitted at: April 26, 2004
Accepted at: June 10, 2004

Citation

V. Karagiannis, C. Manassis, D. Bargiotas, DISPLACEMENT SENSORS USING MAGNETOSTRICTIVE DELAY LINES, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 2, pp. 681-684 (2004)