H - Electricity – 01 – F
Patent
H - Electricity
01
F
H01F 7/06 (2006.01) G01R 33/421 (2006.01) H01F 41/04 (2006.01)
Patent
CA 2115577
A primary gradient coil (4') and a screen coil (5') with the primary coil (4') are constructed to create a substantially null field adjacent to the gradient coil (4'). This coil (3) related to active electromagnetic field screen coils of restricted length and a method of optimizing the magnetic fields created by such coils over one proximate volume while maintaining a null field over a second proximate volume. A method is disclosed for generating the coils (4', 5') by considering the screen coil to be of infinite length, deriving a Fourier transform of the axial and other components of the field in which the transform is the sum of the per- missible harmonic modes on the coil surface in which a coefficient C n is derived representing the nth harmonic. A perfect screen coil is created and the number of terms C n selected using least squares optimization until there is no longer a signifi- cant change in the resulting field. Examples are given in for creating unscreened, screened, linear, axial and transverse gra- dient coils.
British Technology Group Usa Inc.
Fetherstonhaugh & Co.
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