Electricity: measuring and testing – Magnetic – Displacement
Patent
1992-10-15
1995-05-02
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
Displacement
32420724, 32420722, 333148, 73290V, 73314, G01B 714, G01B 726, G01F 2350
Patent
active
054123160
ABSTRACT:
The present application discloses a magnetostrictive linear displacement detector with an axial coil torsional strain transducer. The displacement detector includes a magnetostrictive wire, a return wire and a magnet disposed for displacement along the magnetostrictive wire. A torsional strain sensor at the head end generates an electrical indication of the torsional strain within the magnetostrictive wire induced by passage of an electrical excitation by the position of the magnet. The torsional strain sensor includes two serially connected coils wound in opposite directions. The total length is short compared with the rate of electrical propagation within the magnetostrictive wire and long compared with the rate of torsional strain propagation within the magnetostrictive wire. The induced current within the two coils from electrical excitation of the magnetostrictive wire substantially cancel out because generally the whole sensor is excited simultaneously. The torsional magnetic disturbance accompanying the propagating strain, which is of a much narrower extent, generally induces current in only one of the two sections at a time. This transducer is advantageous because the response in not critically dependant on location.
REFERENCES:
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patent: 4028619 (1977-06-01), Edwards
patent: 4238844 (1980-12-01), Ueda et al.
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patent: 4839590 (1989-06-01), Koski et al.
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IBM Technical Disclosure Bulletin vol. 22 No. 12 May 1980 "Transducers for a Magnetostrictive Positon Sensor" By: D. A. Thompson & T. K. Worthington.
Dumais Arthur
Koski Richard D.
Edmonds Warren S.
O'Shea Sandra L.
Patriot Sensors and Controls
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