Magnetostrictive position indicator

Details Magnetostrictive position indicator Magnetostrictive position indicator

1975-11-03

1978-01-31

Krawczewicz, Stanley T.

Electricity: measuring and testing

Magnetic

Displacement

333 30M, 324219, 324225, G01R 3300

Patent

active

040718182

ABSTRACT:
The position of a movable member is measured without the establishment of physical contact with such member. A magnetic field generator, which provides a localized field of special geometry, is mounted on the movable member and an elongated ferromagnetic member is positioned adjacent and parallel to the path of movement of the member. The magnetic field will produce a change in the Young's modulus of elasticity in an adjacent region of the ferromagnetic member and sonic strain pulses launched along the ferromagnetic member will be partly reflected from this region of Young's modulus discontinuity. The time required for a strain pulse to travel from a given point on the ferromagnetic member to the region of Young's modulus discontinuity and be partially reflected therefrom and returned to a known detection point will provide a measure of the position of the field generator along the elongated ferromagnetic member.

REFERENCES:
patent: 2401094 (1946-05-01), Nicholson, Jr.
patent: 3423673 (1969-01-01), Bailey et al.
patent: 3594740 (1971-07-01), Comeau et al.
patent: 3898555 (1975-08-01), Tellerman

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