| 摘要 |
PCT No. PCT/SE95/00783 Sec. 371 Date May 12, 1997 Sec. 102(e) Date May 12, 1997 PCT Filed Jun. 26, 1995 PCT Pub. No. WO96/01431 PCT Pub. Date Jan. 18, 1996A 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. |
