Position and electromagnetic field sensor

a sensor and electromagnetic field technology, applied in the field of position and electromagnetic field sensors, can solve the problems of sensor not necessarily allowing monitoring of moving objects, electromagnetic energy loss variation within the oscillator, etc., and achieve the effect of increasing spatial resolution and insensitive to amplitude nois
US20060097732A1Inactive Publication Date: 2006-05-11ISIS INNOVATION LTD
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
ISIS INNOVATION LTD
Publication Date
2006-05-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

A position and electromagnetic field sensor is provided. The sensor relies upon an oscillator such as a Robinson marginal oscillator to generate an rf or microwave electromagnetic field. As an inhomogeneously-shaped object, such as a metallic toothed wheel, for example, moves through the resultant field, the field experiences a change in electric or magnetic susceptibility. This in turn causes energy losses in the oscillator the magnitude of which can be output as a d.c. signal related thereto. To detect non-moving objects which nevertheless generate an electromagnetic field or have attached to them a source thereof, the sensor may also include a giant or colossal magnetoresistive structure located adjacent the oscillator coil, the structure having an imaginary magnetic susceptibility which is strongly dependent upon the magnitude and direction of the field generated by or at the object to be sensed.
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Description

RELATED APPLICATIONS

[0001] This application is a divisional application of application Ser. No. 10 / 211,543, filed Jan. 16, 2003, which is a National Stage of International Application PCT / GB01 / 01085, filed Mar. 13, 2001. Application Ser. No. 10 / 211,543 is hereby incorporated by reference in its entirety.BACKGROUND OF INVENTION

[0002] This application relates to a sensor for detecting the position of an object and / or an electromagnetic field associated with that object. SUMMARY

[0003] In embodiments of a first aspect of the present invention, there are provided a susceptibility sensor for detecting relative movement between an inhomogeneously-shaped object to be sensed and the sensor, comprising: an oscillator including a sensor electromagnetic field generator; and an output arranged to provide a signal which varies in dependence upon the change in the electrical properties of the said oscillator; the sensor being arranged such that relative movement between the object to be sensed ...

Claims

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