Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1984-12-12
1986-05-27
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
324320, H01F 500
Patent
active
045918180
ABSTRACT:
A coil arrangement for generating a high frequency magnetic field in a generally cylindrical volume, e.g. for use in an NMR imaging apparatus, comprises a plurality of conductors (11, 13, 15, 17, 19) extending generally parallel to the axis of the volume at spaced positions around the volume and connection means (25, 27, 29) whereby the conductors are connected in electrically parallel paths for energization from a common source (S). The paths are arranged to have a high self-resonant frequency compared with the frequency of the source, e.g. by being arranged each to comprise a single turn only, and the impedances of the paths are arranged to differ so that when energized the fields produced by the individual conductors combine to produce a resultant desired field distribution. By having parallel paths of high self-resonant frequency and different impedance the difficulty of providing a sufficient number of series connected turns distributed so as to obtain a desired field distribution without having a low self-resonant frequency is avoided.
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Harris George
Picker International Limited
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