Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1980-09-26
1983-05-31
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
324245, 324225, G01R 3302, G01N 2772
Patent
active
043863183
ABSTRACT:
A device and method producing a compensated gradiometer signal from an uncompensated gradiometer signal having at least one unwanted term which varies as a function of magnetic field. The device is comprised of a sensing unit for sensing the magnetic field. A generator is provided for producing a first vector signal which is representative of the magnetic field. A function generator is provided for producing a second vector signal which represents a component of one of the at least one unwanted term. A mixer is connected to the generator and the function generator for producing a vector output signal which is equal to the one of the at least one unwanted term. Finally, a subtractor unit is provided which is connected to the mixing means for subtracting the output vector signal from the uncompensated gradiometer signal to thereby produce the compensated gradiometer signal.
REFERENCES:
patent: 3488579 (1970-01-01), Schonstedt
patent: 3530375 (1970-09-01), Passier
Zimmerman, "SQID Instruments . . . ", Feb. 1977, Jor. of Applied Physics, vol. 48, No. 2, pp. 702-710.
Burbank Max B.
Fife Alistair A.
Lomnes Randy K.
Vrba Jiri
Her Majesty the Queen in right of Canada as represented by the
Snow Walter E.
Strecker Gerard R.
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