Patent ID: 6501268
Filing Date: 2002-12-31
Classification: G01R,Y10S

Abstract:
A modulating magnetic field transducer comprising:a base structure; a magnetic sensor attached to said base structure for sensing a magnetic field; a flux concentrator proximate to said magnetic sensor; support means on said base structure for enabling said flux concentrator to assume a repetitive movement; a pair of complementary electrodes for said flux concentrator including a first electrode attached to said base structure in opposition to a corresponding second electrode that is attached to said flux concentrator such that when said pair of complementary electrodes are excited by a modulating electrical signal, said flux concentrator moves at a prescribed frequency to modulate the magnetic field at the magnetic sensor and shift the frequency of the magnetic field that is sensed by the magnetic sensor to a higher frequency to thereby minimize 1/f-type noise, where f is the frequency of operation of the magnetic sensor.