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Cylindrical NMR bias magnet apparatus employing permanent magnets and methods therefor

  • US 4,758,813 A
  • Filed: 06/24/1987
  • Issued: 07/19/1988
  • Est. Priority Date: 06/24/1987
  • Status: Expired due to Fees
First Claim
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1. Magnetic bias apparatus comprising:

  • a plurality of elongated sleeves each having a longitudinal axis and being disposed parallel to each other, said sleeves arranged around a closed curvilinear space to define a bore therein, each of said plurality of sleeves being rotatable about its longitudinal axis; and

    a plurality of rectangular permanent magnet slabs mounted in each of said plurality of sleeves, each of said plurality of permanent magnet slabs having a length, width and thickness dimension and being stacked in the thickness dimension within each of said plurality of sleeves with said length dimension parallel to the longitudinal axis, each of said plurality of rectangular permanent magnet slabs having an anisotropic axis of magnetic orientation parallel to said thickness direction and stacked in a magnetically aiding relation in said thickness direction whereby the magnetic field exhibited through at least a portion of said bore may be maximized and rendered more uniform by rotation of said sleeves to a selected orientation.

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