Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1989-07-31
1992-02-25
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetometers
324247, 33361, G01R 3304, G01C 1728
Patent
active
050916971
ABSTRACT:
A magnetometer and method for measuring magnetic field strength particularly adapted for use in an electronic flux gate compass. A core of magnetic material in the shape of a toroid is coupled to a drive coil and to two sense coils oriented along orthogonal axes. A current limited, current source coupled to the drive coil periodically saturates the core, drives the core out of saturation at an intermediate current level, and saturates the core again. Each sense coil is coupled to a sense circuit which measures the current in the sense coil induced by the periodically changing flux density in the coil resulting from an external magnetic field coupled to the sense coil, produces a dc feedback signal to cancel out the external magnetic field, and provides the dc signal as an output representative of the external magnetic field strength along the axis of the sense coil. The dc signal is produced by synchronously detecting the amplified ac current in the sense coil. Low pass filters are provided to eliminate ac components from the magnetometer output.
REFERENCES:
patent: 4277751 (1981-07-01), Lawson et al.
patent: 4305035 (1981-12-01), Mach et al.
patent: 4859944 (1989-08-01), Webb
Berg-Johansen Roar
Roth Stephen A.
Birdwell William A.
II Morrow Inc.
Snow Walter E.
LandOfFree
Low power, high accuracy magnetometer and magnetic field strengt does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low power, high accuracy magnetometer and magnetic field strengt, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low power, high accuracy magnetometer and magnetic field strengt will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1895258