| 摘要 |
The present invention provides methods and apparatus' relating to the use of GMR materials (206) and the biasing of the GMR material (206) into the Barkhausen effect area. Specifically, the present invention utilizes a GMR bridge (204) to sense and monitor changing magnetic flux (214) such that sensing and signal processing can be effected relative to chances in magnetic flux density (214). As the GMR materials (206) in the GMR bridge (204) are directed to enter into the Barkhausen effect area by a magnetic field generator (210), the GMR material (206) becomes especially sensitive to changes in flux (214) such that a small change in flux (214) can produce a large change in the output of the GMR bridge (204). The various devices herein that take advantage of the GMR materials (206) and the Barkhausen effect include a magnetic coupler (20), an amplifier, a frequency multiplier, a speed/position indicator and an adjustable oscillator. |
