Apparatus for measuring small displacements by using barberpole sensors producing a cyclical voltage having a mark/space ratio indicative of position
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United States of America Patent
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Aug 25, 1992
Grant Date -
N/A
app pub date -
Oct 29, 1990
filing date -
Nov 14, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for measuring small displacements, either linear or angular, employ a pair of spaced 'barber pole' or other magnetic field sensitive elements and a movable magnet, in which the exact position of the movable magnet is determined from the voltages sensed at the two elements. The voltages are evaluated in a circuit which produces a rectangular voltage or equivalent, in which the mark/space ratio equates to the position of the magnet between the two sensors.
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