Coil return energy measurement magnetic field sensor and method

Details Coil return energy measurement magnetic field sensor and method Coil return energy measurement magnetic field sensor and method

1995-06-16

1998-06-09

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetometers

324253, 324654, G01R 2726, G01R 3302, G01R 3304, G01C 730

Patent

active

057640521

ABSTRACT:
A magnetic field sensor comprises a substantially planar core member having flux concentrating fins, and relatively narrow segments that interconnect the fins so that an external magnetic field becomes concentrated within the segments. A quality factor (Q) of a single coil which is wrapped around the segments is monitored to measure or detect the presence of an external magnetic field. To measure an external field, a current is passed through the coil to charge the coil with a known quantity of energy. A circuit of the sensor then measures the quantity of energy returned by the coil to measure the Q of the coil, and to thereby measure the external magnetic field. The magnetic sensor is suitable for pacemaker applications as a substitute for reed switches.

REFERENCES:
patent: 4611127 (1986-09-01), Ibrahim et al.
patent: 4649341 (1987-03-01), Ulbrich et al.
patent: 4994738 (1991-02-01), Soyck et al.
patent: 5014006 (1991-05-01), Seitz
patent: 5432445 (1995-07-01), Dinsmore et al.

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