Low speed wheel presence transducer for railroads with self cali

Details Low speed wheel presence transducer for railroads with self cali Low speed wheel presence transducer for railroads with self cali

1993-09-01

1995-03-07

Huppert, Michael S.

Railway switches and signals

Electric actuation

Car-actuated circuit controllers

324179, B61L 108

Patent

active

053950780

ABSTRACT:
A railroad car wheel transducer includes a coil positioned along a rail of a track. The presence of a wheel proximal to the coil causes basic electrical characteristics of the coil, such as its inductance and Q factor to change, which is sensed and used to generate a coil signal. A calibrating circuit monitors the coil characteristics to compensate for long term drifts.

REFERENCES:
patent: 3151827 (1964-10-01), Gallagher et al.
patent: 3721821 (1973-03-01), Blanyer
patent: 4283031 (1981-08-01), Finch
patent: 4379330 (1983-04-01), Sanville
patent: 4524932 (1985-06-01), Bodziak
patent: 4727372 (1988-02-01), Buttemer

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