Magnetic enclosure and method
OwnerHaim ROTEMinventor
Life of this patent
Estimating the term…
Abstract
A magnetic enclosure providing a uniform magnetic field in a test chamber and comprising substantially identical first north magnetic structure and second south magnetic structures that are disposed in geometric mirroring symmetry opposite to each other and separated by an air gap forming the test chamber. Each magnetic structure includes a cap-like permanent magnet assembly covering a convex ferromagnetic pole piece, a ferromagnetic cap-like shield covering the magnet assembly, and a ferromagnetic ring. The ring is in contact with and intermediate the shield of the first and of the second magnetic structure, and has at least one aperture allowing access to the test chamber.
Claims35
A magnetic enclosure providing a homogeneous, stable, and uniform magnetic field in a test chamber, the magnetic enclosure comprising:
- a north portion substantially identical to a south portion disposed in geometric mirroring symmetry opposite to each other and mutually separated apart by an air gap, each one of the north portion and of the south portion comprising:
- a permanent magnet shell shaped to approximate a hemisphere, the permanent magnet shell having a convex magnet exterior surface and a concave magnet interior surface;
- a ferromagnetic pole piece having a pole piece convex surface disposed in abutting contact with the concave magnet interior surface, and having a pole piece base surface;
- and
- a ferromagnetic shield having a shield rim from which extend a convex shield exterior surface and a concave shield interior surface that is disposed in abutting contact with the convex magnet exterior surface;
- and
- a ferromagnetic ring disposed in abutting contact with and intermediate between the shield rim of the north portion and the shield rim of the south portion to bridge the air gap and to form the test chamber to which access is provided via at least one aperture opened in the ring.
A method for providing a uniform magnetic field across a test chamber disposed in a magnetic enclosure, the method comprising the steps of:
- disposing a north portion substantially identical to a south portion in geometric mirroring symmetry opposite to each other;
- and
- mutually separating therebetween by an air gap, where providing each one of the north portion and of the south portion comprises the steps of:
- providing a permanent magnet shell shaped to approximate a hemisphere, the permanent magnet shell having a convex magnet exterior surface and a concave magnet interior surface;
- disposing a ferromagnetic pole piece having a pole piece convex surface in abutting contact with the concave magnet interior surface, and having a pole piece base surface;
- providing a ferromagnetic shield having a shield rim from which extend a convex shield exterior surface and a concave shield interior surface that is disposed in abutting contact with the convex magnet exterior surface;
- and
- disposing a ferromagnetic ring disposed in abutting contact with and intermediate between the shield rim of the north portion and the shield rim of the south portion to bridge the air gap and to form the test chamber to which access is provided via at least one aperture opened in the ring.
29-30. (canceled)
A magnetic enclosure having two permanent magnet structures providing a homogeneous, stable, and uniform magnetic field in a test chamber, the magnetic enclosure comprising:
- a north portion substantially identical to a south portion disposed in geometric mirroring symmetry opposite to each other and mutually separated apart by an air gap, each one of the north portion and of the south portion comprising:
- a permanent magnet assembly having practically a continuous convex magnet exterior surface and a concave magnet interior surface shaped as a shell of a polyhedron to approximate a hemisphere;
- a ferromagnetic pole piece configured as a magnetic lens, the pole piece having a pole piece convex surface disposed in abutting contact with the concave magnet interior surface, and having a pole piece base surface;
- and
- a ferromagnetic shield having a shield rim from which extend a convex shield exterior surface and a concave shield interior surface that is disposed in abutting contact with the convex magnet exterior surface;
- and
- a ferromagnetic ring disposed in abutting contact with and intermediate between the shield rim of the north portion and of the south portion, the ring being configured to:
- form a return path between the two permanent magnet structures;
- and
- provide access to the test chamber via at least one aperture opened in the ring.
A magnetic enclosure having two permanent magnet structures providing a homogeneous, stable, and uniform magnetic field in a test chamber, the magnetic enclosure comprising:
- a north portion substantially identical to a south portion disposed in geometric mirroring symmetry opposite to each other and mutually separated apart by an air gap, each one of the north portion and of the south portion being characterized by comprising:
- a permanent magnet assembly having practically a continuous convex magnet exterior surface and a concave magnet interior surface shaped as a shell of a polyhedron to approximate a hemisphere;
- a ferromagnetic pole piece configured appropriately as one of a convergent and a divergent magnetic lens, the pole piece having a pole piece convex surface disposed in abutting contact with the concave magnet interior surface, and having a pole piece base surface;
- and
- a ferromagnetic shield having a shield rim from which extend a convex shield exterior surface and a concave shield interior surface that is disposed in abutting contact with the convex magnet exterior surface;
- and
- a ferromagnetic ring disposed in abutting contact with and intermediate between the shield rim of the north portion and of the south portion, the ring having at least one aperture providing access to the test chamber, and being configured to form a return path between the two permanent magnet structures.
Dependencies are inferred from the claim text.