Apparatus for measuring the positions of plural movable members each associated with a respective magnetorestrictive element
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United States of America Patent
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Apr 15, 1997
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N/A
app pub date -
Jun 15, 1993
filing date -
Jan 4, 1991
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Abstract
Apparatus for indicating the value of a variable comprising first and second members moveable relative to each other as a function of said variable, a plurality of elements of a first type on one of said members, at least one element of a second type on the other of said members, one of said types being magnetostrictive and the other being operative to produce a magnetic bias field, said elements being arranged so that as said first and second members move relative to each other different ones of said plurality of elements of said first type magnetically interact with said at least one element of said second type such that, for different positions of said members, said interaction causes magnetostrictive resonance at different frequencies in response to an alternating interrogating magnetic field at said different frequencies.
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