Patent ID: 8395468
Filing Date: 2013-03-12
Classification: G01R,H01F

Abstract:
1. A magnetic field generation system, comprising: a) first and second magnetic flux concentrators each spaced apart to form a sample volume, said first and second magnetic flux concentrators having a magnetic field saturation; b) a first set of auxiliary permanent magnets symmetrically oriented about a portion of the first magnetic flux concentrator and in substantial contact with the first magnetic flux concentrator, said first set of auxiliary permanent magnets remote from the sample volume, and each of the first set of auxiliary permanent magnets oriented in a magnetically repulsive orientation with respect to at least one other member of the first set of auxiliary permanent magnets; and c) a second set of auxiliary permanent magnets symmetrically oriented about a portion of the second magnetic flux concentrator and in substantial contact with the second magnetic flux concentrator, said second set of auxiliary permanent magnets remote from the sample volume, and each of the second set of auxiliary permanent magnets oriented in a magnetically repulsive orientation with respect to at least one other member of the second set of auxiliary permanent magnets and magnetically associated to the first set of auxiliary permanent magnets via the first and second magnetic flux concentrators; d) a field lock, shim coils, sample probe, gradient coils, quadrature detector, digital filtering device, or combinations thereof operatively connected to the system; and e) a first and a second magnetically soft shunt each movably oriented above and below the first and second magnetic flux concentrators respectively such that a first distance between each of the first magnetically soft shunt and the first magnetic flux concentrator, and second distance between each of the second magnetically soft shunt and the second magnetic flux concentrator can be varied to effect a change in magnetic field strength across the sample volume.