RAILWAY WHEEL SENSOR

摘要

A sensor for detecting the presence of wheels of a rail vehicle is disclosed. The sensor comprises first and second Hall Effect devices, a magnet for supplying a magnetic field to the first and second Hall Effect devices, means for mounting the first and second Hall Effect devices and the magnet adjacent to the rail, whereby a railway vehicle wheel changes the magnetic field in the Hall Effect devices to produce wheel indication signals, and a processing circuit for receiving the wheel indication signals from the first and second Hall Effect devices and for producing an output signal in response to the wheel indication signals. A method of detecting the presence of a wheel is also provided.