Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1997-11-13
1999-08-17
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetometers
341155, G01R 3304, H03M 112
Patent
active
059398817
ABSTRACT:
An improved digital fluxgate magnetometer that uses digital logic and a high resolution digital to analog converter to digitize a magnetic signal for use by signal processing algorithms. The magnetometer includes an oscillator that outputs an oscillator signal and a magnetic fluxgate sensor having a drive coil coupled to the oscillator, a feedback coil, and a sense coil. An analog multiplier is coupled to the sense coil and the oscillator and outputs a signal to an analog low pass filter. A comparator is coupled to the analog multiplier, and a register is coupled to the comparator and outputs a logical 1 or a logical 0 in accordance with the output of the comparator. A digital filter receives the output of the register and produces a digital output of the digital fluxgate magnetometer. A high resolution digital to analog converter is coupled between the register and the feedback coil of the magnetic fluxgate sensor in a feedback loop of the sensor. The digital to analog converter produces a very high resolution digitized output (typically >22 bits) that is necessary to adequately represent the dynamic range of the sensor.
REFERENCES:
patent: 4677381 (1987-06-01), Geerlings
Kohnen Kirk K.
Slater Eric K.
Alkov Leonard A.
Lenzen, Jr. Glenn H.
Raufer Colin M.
Raytheon Company
Snow Walter E.
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