Method of measuring variation in the elongation of a very long magnetizable element of small transverse dimensions, and apparatus for implementing the method
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United States of America Patent
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Nov 1, 1988
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N/A
app pub date -
Feb 20, 1987
filing date -
Feb 27, 1986
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Expired
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Abstract
A method of measuring variation in the elongation of a very long element of small transverse dimensions and made of magnetizable material, optionally covered by non-magnetic material, and running between a lower elongation zone and a higher elongation zone, or vice versa, said method consisting in periodically magnetically marking the elongate element simultaneously at two points spaced apart by a predetermined distance therealong in a first one of said zones, and then in detecting the instants at which said magnetic marks pass at least one point situated in the other one of said zones.
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