Importance

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Abstract

A transducer comprises a pair of inductive coils connected in series. The coils of the pair are arranged adjacent one another with respective end faces of the coils substantially mutually aligned. A magnetically permeable member is movable relative to the end faces in such a manner that the impedance offered to an AC signal by one coil increases while the impedance offered to the signal by the other coil decreases. The end faces of the coils may be curved and arranged diametrically opposite one another around the circumference of a circle, and the magnetically permeable member may comprise a generally semi-circular plate, rotatable about an axis passing through the center of the circle, for covering approximately half of the total area of the end faces of the coils. This arrangement provides for linearity of output voltage variation with angular position of the plate. To reduce the effect of axial displacement of the plate on output voltage, two opposing pairs of coils may be provided, the plate being located between the pairs of coils.

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First Claim