Linear displacement transducer

Details Linear displacement transducer Linear displacement transducer

1975-12-22

1977-04-05

Woodiel, Donald O.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

73141A, 73407R, G01L 916

Patent

active

040154777

ABSTRACT:
A displacement transducer capable of accurately measuring small displacements. The transducer includes a magnetostrictive wire exposed to a stationary magnetic field and having an S-shape, one arc forming one section of the wire and the reverse arc the adjacent section. One end of the wire is fixed, whereas the other end is attached to a displaceable element whereby movement of the element changes the radius of curvature of the arcs. An amplifier whose input is connected to one section of the wire and whose output is connected to the other section thereof yields electrical pulses in the output to produce torsional vibration of the two sections, creating a sinusoidal electrical signal which is fed back to the amplifier input, thereby sustaining oscillations therein whose frequency depends on the radius of curvature and is therefore a function of the extent of displacement. Means are provided to linearize the relationship between displacement and frequency.

REFERENCES:
patent: 3371536 (1968-03-01), Tellerman

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