Device for measuring the speed of a rail-mounted vehicle
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United States of America Patent
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Oct 20, 1998
Grant Date -
N/A
app pub date -
May 12, 1997
filing date -
Jul 4, 1994
priority date (Note) -
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Abstract
A rail mounted vehicle speed measuring device includes a first magnetic field generating member and a first magnetic field sensing member positioned at a first measuring location on the vehicle; a second magnetic field generating member and a second magnetic field sensing member positioned at a second measuring location on the vehicle, spaced a fixed distance from the first location in the direction of vehicle movement; wherein the magnetic fields generated by the first and second magnetic field generating member are influenced by the rail to produce first and second signal patterns sensed by the first and second sensing member and varying with movement of the vehicle along the rail; and device is provided for correlating the first and second sensed signal patterns to determine the time displacement between the two sensed signal patterns and the velocity of the vehicle.
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