| 摘要 |
A gear tooth sensor is provided which incorporates a magnet and two magnetically sensitive devices, such as Hall effect elements. The two magnetically sensitive devices are disposed in a common plane with each other with one of the devices being located at a position closer to the magnet than the other device. The common plane in which both magnetically sensitive devices are disposed is spaced apart from a central axis of the magnet by a predetermined distance. A means is provided for determining a ratio of the magnetic field strengths that are imposed perpendicularly on the first and second magnetically sensitive devices. The ratio is used to distinguish between teeth and slots proximate the sensor wherein the common plane of the magnetically sensitive devices is generally perpendicular to the path along which the teeth and slots pass. |
