US3662304A - Magnetic circuit structure for high-resolution nuclear resonance spectrometers - Google Patents

Magnetic circuit structure for high-resolution nuclear resonance spectrometers Download PDF

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Publication number
US3662304A
US3662304A US51979A US3662304DA US3662304A US 3662304 A US3662304 A US 3662304A US 51979 A US51979 A US 51979A US 3662304D A US3662304D A US 3662304DA US 3662304 A US3662304 A US 3662304A
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US
United States
Prior art keywords
members
circuit structure
magnetic
magnetic circuit
pole pieces
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Expired - Lifetime
Application number
US51979A
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English (en)
Inventor
Wolfgang Bringe
Eberhard Querfurth
Hans-Albr Schanbacher
Hans-Jurgen Seiberth
Wolfgang Vieser
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Siemens AG
Siemens Corp
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Siemens Corp
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Publication date
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Publication of US3662304A publication Critical patent/US3662304A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/383—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets

Definitions

  • ABSTRACT A pair of shells of approximately half-spherical form have magnetic members mounted therein with the end faces of the [30] Foreign Apphcauon Pnomy Data pole pieces coplanar with the annular end faces of the shells, July 25, 1969 Germany ..P 19 37 794.7 o l narity being achieved by lapping. Distance pieces are placed in notches in the annular end faces of the shells, which U.S. are with insulating material up (9 a level below the end [5 l l [III- CI- faces ofthe pole pieces [58] Field of Search ..335/296, 297, 298, 281
  • the invention relates to a magnetic circuit structure for high-resolution nuclear resonance spectrometers of the type comprising a pair of opposed pole pieces mounted on active magnetic members and having their end faces parallel to each other.
  • the magnetic structure according to the invention is characterized by a pair of shell members forming a hollow body of rotational symmetry, in the interior of which the active magnetic members are mounted coaxial with the pole pieces, the annular surfaces of the shell members being disposed in the plane of the end faces of the pole pieces. Distance pieces are provided between the annular surfaces of the shell members to define the distance between the same.
  • This construction of the magnetic structure is characterized by the essential feature of a division into a pair of similar halves, the end faces of the pole pieces and the annular faces ofthe shell members being in one and the same plane.
  • the dimension of the air gap can be controlled by means of the distance pieces which form part of the magnetic structure and are made of a material having a high saturation value of magnetic induction.
  • the invention also relates to a method of manufacturing the structure, which is characterized in that the annular face of each shell member and the end face of the corresponding pole piece are brought into coplanar relation by means of a machining operation such as lapping and the distance pieces being treated in a simultaneous machining process, suchas lapping to bring the surfaces thereof into coplanar relation.
  • the magnetic structure M comprises a pair of shell members SI and S2 which form together a hollow body of rotational symmetry with somewhat flattenedendportions. ln the interior of the shell members S1 and S2, active magnetic members T1 and T2 are disposed coaxially with each other and integral with the walls of the shells S1 and S2. For instance, members T1. and T2 may be. inserted in circular recesses A1 and A2, a mass of insulating material 7 filling the space between active members T1 and T2 and the shells Sl and'S2 up to a certain level which permits the pole pieces P1 and P2, which are disposed on the active members T1 and T2, to project from the insulating material 7.
  • the active members T1 and T2 may be permanent magnets or electromagnets having their energizing windings placed on the mantle surfaces thereof in well-known manner.
  • the pole pieces P1 and P2 are secured to the active mem-' bers T1 and T2'with the aid ofcentering rings Z1 and 22.
  • the shells S1 and S2 in the finished structure form a protective shield .for the magnetic field between'the end faces F land F2 of the'pole pieces P1 and P2 so as. to suppress the influence of external disturbing fields.
  • the spacing a between the terminal faces F l and F2 should have a constant value over the entire end faces F1 and F2, this value being controlled by meansof distance pieces D, which are disposed along the annular faces R1 and R2 of the shell members S1 and S2.
  • the dimension of the distance pieces D controls the spacing a of the end faces F1 and F2.
  • the distance pieces D are of a material of high permeability and form a yoke portion of the magnetic structure M. They are uniformly distributed along the circumference of the annular faces R1 and R2, so as to form a practically uninterrupted ring.
  • the shell members S1 and S2 are provided with external flanges W1 and W2 which have borings provided therein at uniformly spaced points. Inserted in the borings are bolts SB, which may cooperate with nuts (not shown) to hold the shell members S1 and S2 in firm contact with the distance pieces D.
  • annular notches RNl and RN2 are provided in the annularsurfaces R1 and R2 thereof. Inserted in notches RN] and RN2 are centering members Z, which are uniformly spaced and ensure the accurate alignment of the end faces F l and P2 of the pole pieces P1 and P2 opposite to each other.
  • the production of the magnetic structure M according to the invention comprises the treating of the annular face R1 or R2 together with the corresponding end face F1 or F2, respectively, in a common machining process, such as lapping, to achieve the highest possible degree of coplanarity thereof. This also assures the highest possible degree of evenness of faces F1 and F2. lrregularities due to the machining process, such as edge deficiencies at the end faces F1 and F2 of the pole pieces P1 and P2, which could give rise to distortions of the magnetic field, are possible, according to this method only with regard to the external annular portions of the faces R1 and R2.
  • a magnetic circuit structure for high resolution nuclearresonance spectrometers comprising a pair of oppositely disposed pole pieces permanently mounted on active mag netic members and having their end faces parallel to each other, characterized in that the magnetic structure (M) comprises a pair of shell members (S1 and S2) forming a hollow body of rotational symmetry, said active magnetic members (T1 and T2) with said pole pieces (Pland P2) being disposed coaxial to each other therein and the annular faces (R1 and R2). of the shell members (S1 and S2) being disposed in the plane of the end faces (F1, F2), of the pole pieces (P1, P2), distance pieces (D) being provided between said annular faces (R1, R2) so as to define the distance a therebetween.
  • the magnetic structure (M) comprises a pair of shell members (S1 and S2) forming a hollow body of rotational symmetry, said active magnetic members (T1 and T2) with said pole pieces (Pland P2) being disposed coaxial to each other therein and the annular faces (

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
US51979A 1969-07-25 1970-07-02 Magnetic circuit structure for high-resolution nuclear resonance spectrometers Expired - Lifetime US3662304A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1937794A DE1937794C3 (de) 1969-07-25 1969-07-25 Magnet fur hochauflosendes Kern resonanzspektrometer

Publications (1)

Publication Number Publication Date
US3662304A true US3662304A (en) 1972-05-09

Family

ID=5740846

Family Applications (1)

Application Number Title Priority Date Filing Date
US51979A Expired - Lifetime US3662304A (en) 1969-07-25 1970-07-02 Magnetic circuit structure for high-resolution nuclear resonance spectrometers

Country Status (7)

Country Link
US (1) US3662304A (fr)
BE (1) BE753879A (fr)
DE (1) DE1937794C3 (fr)
FR (1) FR2055591A5 (fr)
GB (1) GB1309004A (fr)
LU (1) LU61396A1 (fr)
NL (1) NL7007670A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781735A (en) * 1971-09-15 1973-12-25 Bruker Physik Ag Apparatus for adjusting magnet cores
US4217568A (en) * 1976-11-04 1980-08-12 Hitachi, Ltd. Magnetic pole pieces for use in a nuclear magnetic resonance apparatus
US4484161A (en) * 1982-05-24 1984-11-20 Varian Associates, Inc. Silicone rubber for relieving stress in magnetic material
WO1994007250A1 (fr) * 1992-09-11 1994-03-31 Magna-Lab Inc. Structure d'aimant permanent
WO1995010786A3 (fr) * 1993-10-11 1995-06-01 Innervision Mri Limited Appareil de mesure par resonance magnetique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3123493A1 (de) * 1981-06-13 1982-12-30 Bruker Analytische Meßtechnik GmbH, 7512 Rheinstetten Elektromagnet fuer die nmr-tomographie

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3150295A (en) * 1954-03-19 1964-09-22 Varian Associates Electromagnet with adjustable air gap
DE1236672B (de) * 1963-12-18 1967-03-16 Commissariat Energie Atomique Brennstoffelement fuer Kernreaktoren
US3437963A (en) * 1967-06-12 1969-04-08 Varian Associates Permanent magnet having an enclosing yoke structure with pole aligning means

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3150295A (en) * 1954-03-19 1964-09-22 Varian Associates Electromagnet with adjustable air gap
DE1236672B (de) * 1963-12-18 1967-03-16 Commissariat Energie Atomique Brennstoffelement fuer Kernreaktoren
US3437963A (en) * 1967-06-12 1969-04-08 Varian Associates Permanent magnet having an enclosing yoke structure with pole aligning means

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781735A (en) * 1971-09-15 1973-12-25 Bruker Physik Ag Apparatus for adjusting magnet cores
US4217568A (en) * 1976-11-04 1980-08-12 Hitachi, Ltd. Magnetic pole pieces for use in a nuclear magnetic resonance apparatus
US4484161A (en) * 1982-05-24 1984-11-20 Varian Associates, Inc. Silicone rubber for relieving stress in magnetic material
WO1994007250A1 (fr) * 1992-09-11 1994-03-31 Magna-Lab Inc. Structure d'aimant permanent
US5623241A (en) * 1992-09-11 1997-04-22 Magna-Lab, Inc. Permanent magnetic structure
WO1995010786A3 (fr) * 1993-10-11 1995-06-01 Innervision Mri Limited Appareil de mesure par resonance magnetique

Also Published As

Publication number Publication date
NL7007670A (fr) 1971-01-27
GB1309004A (en) 1973-03-07
DE1937794B2 (de) 1973-05-03
DE1937794C3 (de) 1973-11-29
BE753879A (fr) 1971-01-25
FR2055591A5 (fr) 1971-05-07
DE1937794A1 (de) 1971-02-11
LU61396A1 (fr) 1970-09-23

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