E/U core linear variable differential transformer for precise displacement measurement
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United States of America Patent
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Nov 21, 1995
Grant Date -
N/A
app pub date -
Nov 2, 1992
filing date -
Nov 2, 1992
priority date (Note) -
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Abstract
The present invention relates to a displacement sensor for measuring submicroinch displacements. An LVDT is constructed from an E core having a primary winding on the center pole piece and two secondary windings about two additional pole pieces. The E core device is mounted on a stationary surface opposite a pair of U cores mounted on a translating surface. The U cores are spaced adjacent to each other, having an axis defined coincident with the axis of the E core pole piece which supports the primary winding. This position produces a null voltage from the differentially-connected secondary windings. Linear displacement between the U core and E core results in different coupling between the secondary windings and primary windings. The resulting voltage difference is a measurement of displacement .DELTA.X.
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