Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1996-05-28
1998-07-21
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetometers
32420722, 324345, 364560, G01R 3302, G01B 700, G01V 300
Patent
active
057839441
ABSTRACT:
A processing method that estimates the size and structural features of a magnetizable object or source from readings provided by an array of magnetic sensors. Using the method, an array of magnetic sensors generates magnetic reading derived from the source that are processed by selecting candidate positions for the location of the source. The correlation B.sup.T B is maximized, where B=Rm and B is a vector of composite measurements from the array of magnetic sensors, R is a projection matrix from the location of the magnetic source to the sensors, B is an estimated vector of composite measurements representative of what the true magnetic readings should be for a source at an assumed location 16, and m is a dipole strength vector. The maximum correlation is chosen which is indicative of the location and magnitude of the source. Candidate arrangements of sets of dipoles 11a symmetrically arranged about the chosen location of the source are then selected. Readings from the plurality of magnetic sensors are again processed to maximize the correlation B.sup.T B over sets of positions corresponding to locations of the sets of symmetrically arranged dipoles. The maximum correlation is chosen which is indicative of the arrangement of dipoles that most closely resembles the structure of the source. This processing provides for a multiple position solution to the distribution of the magnetic source.
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Alkov Leonard A.
Hughes Electronics
Lenzen, Jr. Glenn H.
Schubert William C.
Snow Walter E.
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