Researchers at Oxford University’s Physics Department have developed an extraordinarily versatile proximity sensor for the detection of objects, composed of ferrous and non-ferrous metals, ceramics, glasses and plastics. This new device could be used as a position or speed sensor in automotive suspension, gearbox and engine management systems, amongst many other uses.
Researchers had identified the need for a relatively simple, but highly versatile proximity sensor to detect the motion of a wide variety of metals and non-metals. Existing proximity sensors tended to rely on magnetic induction, reluctance or Hall effect devices for their performance characteristics, which in automotive ignition sensors can lead to poor slow running performance.
The Oxford invention consists of an electronic oscillator circuit, an antenna, and a discrete sensor element, all of which could be encapsulated into a single compact unit. The sensor is able to detect any relative movement between the object to be sensed and the sensor by detecting the perturbation of the electromagnetic field generated by the antenna. The sensor is highly versatile and can simultaneously detect changes in the both the electric or magnetic properties of the target object. The sensor itself requires no adjustment to change modes and generates a signal regardless of which parameter of the target object is changing. Tests have shown that a wide range of materials can be detected, ranging from ferromagnets, non-ferromagnets and non-ferrous metals, to ceramics and plastics.
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