Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1994-01-03
1996-06-25
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetometers
G01R 3304
Patent
active
055303498
ABSTRACT:
The sensor device uses the flux-gate principle and detects and cancels a second harmonic frequency (2f.sub.o) output by a sensor coil (23). The sensor device includes a master oscillator (1) that provides a stable output that is supplied to a generator (2) which generate two signals which respectively have a basic operating frequency (f.sub.o) and a double basic operating frequency (2f.sub.o or 2fc). The basic operating frequency (f.sub.o) is amplified in a power booster (3) and is connected to drive coil (22) mounted on a core (39) in the sensor head (4) to saturate the core (39). The output signal from the sensor coil (23) of sensor head (4) is filtered in a first bandpass filter (5) to obtain the second harmonic of the sensor coil, the output signal of the first bandpass filter (5) is detected in a phase detector (6) that is also connected to receive the double (2fc) frequency. The phase detector output is connected to a second low filter (7). A communications circuit (8) and a self-calibration circuit (9) for the transmission and reception of data to and from a remote station (27), enables a self-calibrating and checking of operation of the sensor device based on control command signals received from the remote station (27). The filters (46, 47) are preferably switched-type capacitor filters; they are controlled, as is also the phase detector (6) by the master oscillator.
REFERENCES:
patent: 3286169 (1966-11-01), Slonczewski
Proceedings of Eurosensors VI Sensors and Actuators A, vol. 37-38, Jun. 1993, Lausanne Ch, pp. 442-448, B. Tamayo et al "Magnetometric Sensor to Control the Ground Traffic of Aircraft".
The "Flux-gate magnetometer" by F. Primdahl, published in the J. Phys. E: Sci. Instrum., vol. 12, 1979, p. 241 et seq.;.
Databook vol. 1, 1989, National Semiconductor, "Data Acquisition Linear Devices," pp. 1-152 to 1-173, dev.: MF8, 4th-Order Switched Capacitor Bandpass Filter;.
Carbonero Miguel H.
Hernandez Francisco S.
Hernandez-Ros Claudio A.
Lopez Braulio T.
Perez Eloisa L.
Alcatel Standard Electrica S.A.
Snow Walter E.
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