Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1996-04-23
1997-12-09
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetometers
G01R 3304
Patent
active
056965753
ABSTRACT:
Digital logic and a high resolution digital to analog converter are used to adequately digitize a magnetic signal that is subsequently processed by magnetic data processing algorithms. The high resolution digital to analog converter is directly incorporated in a feedback loop of a magnetometer sensor, an expensive precision analog to digital converter is replaced by a less expensive, lower power digital to analog converter. The circuit improvement provided by the present invention includes an analog low pass filter coupled to the sensor, a digital logic circuit coupled to the analog low pass filter for providing an output signal from the magnetometer and a feedback output signal, and the digital to analog converter coupled between the digital logic circuit and a feedback coil of the sensor for coupling the feedback output signal thereto. The digital logic circuit includes an analog to digital converter, an adder having a first input coupled to the analog to digital converter, and an accumulator coupled between an output of the adder and a second input of the adder. The digital logic circuitry processes the error signal from the analog multiplier, eliminates high frequency components, and digitizes the result. Thus, a low resolution analog to digital converter, having a resolution of only a few bits, may be used.
REFERENCES:
F. Primdahl, H. Hernando, J.R. Petersen and O.V. Nielson, "Digital Detection of the Flux-Gate Sensor Output Signal", Meas. Sc. Technol. 5 (1994).
Kohnen Kirk
Slater Eric K.
Denson-Low W.
Grunebach G. S.
Hughes Aircraft
Sales M. W.
Snow Walter E.
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