The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 2012
Filed:
Jun. 18, 2008
David Alan Clark, Lexington, KY (US);
David Alan Clark, Lexington, KY (US);
Commonwealth Scientific and Industrial Research Organisation, Campbell, AU;
Abstract
Locating and characterising a magnetised body involves moving a magnetic gradient tensor sensor relative to the magnetised body along a profile, or allowing the magnetised body to move along a profile past the sensor. Magnetic gradient tensor measurements are obtained at points along the profile. A rotational invariant calculated from the eigenvalues of the magnetic gradient tensor measurements is then used to locate and/or characterize the body. The rotational invariant can be the scaled moment of a point dipole representation of the magnetised body, or one third of the square root of the scaled moment. The rotational invariant is modelled and sufficient measurements obtained to over-determine parameters of the model. A system of linear equations resulting from a model of the gradient tensor elements is then solved using the determined values of parameters.