Magnetofluidic accelerometer with non-magnetic film on drive magnets
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United States of America Patent
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app pub date -
Dec 8, 2004
filing date -
Sep 23, 2004
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Abandoned
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Abstract
A sensor includes an inertial body; a plurality of sources of magnetic field located generally surrounding the inertial body; magnetic fluid between the sources and the inertial body; and a non-magnetic coating on surfaces of the sources facing the magnetic fluid. Displacement of the inertial body is indicative of acceleration. The acceleration can include linear acceleration and angular acceleration. The angular acceleration can include three components of acceleration about three orthogonal axes. The sources include permanent magnets, or electromagnets, or both. A plurality of sensing coils detect changes in magnetic field within the magnetic fluid due to the displacement of the inertial body. The non-magnetic coating can also cover the sensing coils. A housing encloses the inertial body and the magnetic fluid. The magnetic fluid can use kerosene, water or oil as the carrier liquid. The magnetic fluid is a colloidal suspension. The non-magnetic coating can use Teflon (tetrofluoroethylene), PET (polyethyleneteraphthalate), a polyimide, a polymer or a resin.
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