Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Multimode Magnetic Field and Position Sensor from Oxford University

15.08.2002


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.



A prototype of the sensor, which has already been tested as an ignition-timing sensor on an internal combustion engine, offers a high sensitivity, high output unit. The new sensor is also capable of detecting rotating magnets, ferrous wheels and brake discs, non-magnetic metal-toothed wheels, and even plastic gearwheels. The shape of the output signal from the sensor device is square, well-defined, and speed independent, unlike the variable reluctance sensor it would replace. The sensor element can tolerate temperatures in excess of 1000 oC for long periods and has an excellent signal to noise ratio. In mass production it would be cheap to produce and compact in size.

Other potential applications for the sensor, which is the subject of a patent application from Isis Innovation, Oxford University’s technology transfer company, include detection of changes in the flow of inhomogeneous liquids, such as blood/saline, water-in-oil or oil-in-water mixtures. Companies interested in exploiting this technology in any number of applications are welcome to contact Isis Innovation.

Jennifer Johnson | alfa
Further information:
http://www.isis-innovation.com/licensing/818.html

More articles from Process Engineering:

nachricht Etching Microstructures with Lasers
25.10.2016 | Fraunhofer-Institut für Lasertechnik ILT

nachricht Applying electron beams to 3-D objects
23.09.2016 | Fraunhofer-Institut für Organische Elektronik, Elektronenstrahl- und Plasmatechnik FEP

All articles from Process Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>