Device for measuring displacement
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United States of America Patent
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May 30, 1989
Issued Date -
N/A
app pub date -
Nov 23, 1987
filing date -
Apr 4, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Herein disclosed is a device for measuring a displacement of a movable member relative to a fixed member by putting the electromagnetic induction into practical use. The device comprises a first coil having first and second coil sections which are coaxially aligned along a common axis, a second coil arranged to establish a magnetic coupling with the first coil and extending along the common axis, and a short circuit ring arranged to establish a magnetic coupling with the first and second coils and movable relative to the same. The winding density of each of the first and second coil sections is gradually decreased from the outside end to the inside end thereof, and the winding density of the second coil is substantially even throughout the length of the same.
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