Railway wheel sensor employing hall effect devices

摘要

A sensor for detecting the presence of wheels of a rail vehicle is disclosed. The sensorcomprises first and second Hall Effect devices, a magnet for supplying a magneticfield to the first and second Hall Effect devices, means for mounting the firstand second Hall Effect devices and the magnet adjacent to the rail, whereby a railwayvehicle wheel changes the magnetic field in the Hall Effect devices to producewheel indication signals, and a processing circuit for receiving the wheel indicationsignals from the first and second Hall Effect devices and for producing an outputsignal in response to the wheel indication signals. A method of detecting thepresence of a wheel is also provided.