Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1978-05-01
1981-10-06
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
33312, 324346, 364422, G01R 3304, G01V 326
Patent
active
042938155
ABSTRACT:
A flux gate magnetometer system utilizes three independent flux gates for measuring the three mutually orthogonal components of the earth's magnetic field. A sensor for each flux gate includes a ring core with a toroidal winding as the drive winding and a differential winding for sensing the difference in saturation due to the earth's flux linkages in the core. The operation of the flux gate magnetometer system is stabilized by a second harmonic servo type null circuit. The output of the differential sense winding is beat with a signal twice the frequency of the drive signal and in phase with the sensor output. This demodulated signal is the error signal for an integration stage. The integration stage drives a high impedance current source which sums into the flux gate sense winding and eliminates the effect of the earth's field in the sensor. An error signal is generated only when the high impedance current source does not null the earth's flux linkages in the core. The flux gate magnetometer system provides a means for determining the components of the earth's magnetic field for use in a digital mineral logging system.
REFERENCES:
patent: 2421074 (1969-01-01), Geyger
patent: 2480575 (1949-08-01), Hare
patent: 2663843 (1953-12-01), Wickerham et al.
patent: 2755434 (1956-07-01), Yetter
patent: 2861242 (1958-11-01), Leavitt
patent: 2942179 (1960-06-01), Coker
patent: 3286169 (1966-11-01), Slonczewski
patent: 3458802 (1969-07-01), Koerner
patent: 3568052 (1971-03-01), Anderson
patent: 3622873 (1971-11-01), Stine
patent: 3657641 (1972-04-01), Kardashian
patent: 3679969 (1972-07-01), Fussell
patent: 3686581 (1972-08-01), Takeda et al.
patent: 3686581 (1972-08-01), Takeda et al.
patent: 3971981 (1976-07-01), Nakagome et al.
patent: 3983475 (1976-09-01), Watanabe et al.
Geyer, William A., "The Ring-Core Magnetometer . . . ", AIEE Transac. Communications & Electronics, vol. 81, pt. 1 #59 Mar. 1962, pp. 65-73.
Fung Bing-Fai
Kretzschnar John L.
West Jerry B.
Century Geophysical Corporation
Strecker Gerard R.
LandOfFree
Fluxgate magnetometer circuit with earth's field elimination does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluxgate magnetometer circuit with earth's field elimination, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluxgate magnetometer circuit with earth's field elimination will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1208925