Nickel alloy magnetostrictive wire and displacement detection de

Details Nickel alloy magnetostrictive wire and displacement detection de Nickel alloy magnetostrictive wire and displacement detection de

1996-12-27

1999-03-23

Patidar, Jay M.

Electricity: measuring and testing

Magnetic

Displacement

32420724, 73290V, G01B 714

Patent

active

058865187

ABSTRACT:
A displacement detection device and a wire therefor in which the drawbacks of the conventional Elinvar-type alloy are eliminated, the magnetostriction intensity as well as the magnetostriction propagation speed does not vary with temperature, and a magnetostriction coefficient is sufficiently great to enable an amplification at a high speed of response to be unnecessary. A magnetostrictive wire used in a displacement detection device together with a magnetostriction-generating magnet disposed close thereto and movable relative thereto, said wire substantially composed of 35 to 60 wt % Ni and the balance consisting of Fe and unavoidable impurities, cold-wire-drawn and then heat-treated and having a magnetostriction coefficient greater than that exhibited in an as-cold-wire-drawn state. A displacement detection device includes the above-mentioned magnetostrictive wire and a magnetostrictive-generating magnet disposed movable relative thereto and therealong for detecting a relative displacement between the magnetostrictive wire and the magnet based on a time of propagation, through the wire, of a magnetostriction signal generated in the wire in the portion close to the magnet by a pulse current applied to the wire.

REFERENCES:
patent: 3173131 (1965-03-01), Perucca
patent: 5017867 (1991-05-01), Dumais et al.
patent: 5110376 (1992-05-01), Kobayashi et al.
patent: 5262248 (1993-11-01), Ihara et al.
patent: 5274328 (1993-12-01), Begin et al.
Richard M. Bozorth, "Ferromagnetism" (D. Van Nostrand Co, Princeton, N.J. Jan. 1951), pp. 112-125.

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