DE1176755B - Device for generating a homogeneous magnetic field - Google Patents

Device for generating a homogeneous magnetic field

Info

Publication number
DE1176755B
DE1176755B DE1956P0025581 DEP0025581A DE1176755B DE 1176755 B DE1176755 B DE 1176755B DE 1956P0025581 DE1956P0025581 DE 1956P0025581 DE P0025581 A DEP0025581 A DE P0025581A DE 1176755 B DE1176755 B DE 1176755B
Authority
DE
Germany
Prior art keywords
magnetic field
generating
homogeneous magnetic
air gap
pole face
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE1956P0025581
Other languages
German (de)
Inventor
Edward M Purcell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Applied Biosystems Inc
Original Assignee
Perkin Elmer Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Perkin Elmer Corp filed Critical Perkin Elmer Corp
Publication of DE1176755B publication Critical patent/DE1176755B/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/20—Electromagnets; Actuators including electromagnets without armatures
    • H01F7/202—Electromagnets for high magnetic field strength

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Description

Vorrichtung zur Erzeugung eines homogenen Magnetfeldes Die Erfindung bezieht sich auf eine Vorrichtung zur Erzeugung von außerordentlich homogenen magnetischen Feldern, wie sie beispielsweise bei der Untersuchung des Kernmagnetismus häufig benötigt werden. Bei gewissen Versuchsanordnungen braucht man - um nur ein Beispiel zu nennen - ein magnetisches Feld in der Größenordnung von 5000 Gauß (0,5 Voltsekunden/m=) bei einer Homogenität von weniger als 10-s Gauß über einen Bereich in der Größenordnung von 1 cm.Device for generating a homogeneous magnetic field The invention relates to a device for producing extremely homogeneous magnetic Fields, such as those often found in the study of nuclear magnetism are needed. With certain experimental arrangements you need - just one example to mention - a magnetic field of the order of 5000 Gauss (0.5 volt seconds / m =) with a homogeneity of less than 10-s Gauss over a range of the order of magnitude of 1 cm.

Je empfidlicher die Meßverfahren werden, um so höhere Anforderungen werden auch an die Homogenität und die zeitliche Konstanz der magnetischen Felder gestellt.The more sensitive the measurement method, the higher the requirements are also of the homogeneity and the temporal constancy of the magnetic fields posed.

Es gibt verschiedene Mittel, um die Homogenität des Magnetfeldes zu erhöhen, z. B. indem jeder der Polschuhe von einer Mehrzahl ferromagnetischer Scheiben gebildet wird, die miteinander durch Schichten verbunden sind, deren magnetischer Widerstand wesentlich höher ist, oder durch genaue Parallelstellung der Polflächen zueinander, indem wenigstens einer der Polschuhe elastisch gelagert und unter Zwischenlage, von unmagnetischen, genau gearbeitetem Abstandshaltem gegen den anderen Polschuh gedrückt wird. Es bleibt dann aber immer noch ein geringer Homogenitätsfehler, der durch die endlichen Abmessungen der Polflächen bedingt ist. Der Erfindung liegt die, Aufgabe zugrunde, diesen Fehler auszugleichen. Erfindungsgemäß geschieht das dadurch, daß in dem Luftspalt je eine stromdurchflossene Spule vor jeder Polfläche angeordnet ist.There are different means to ensure the homogeneity of the magnetic field increase e.g. B. by each of the pole pieces from a plurality of ferromagnetic discs is formed, which are connected to each other by layers, their magnetic Resistance is much higher, or by precisely paralleling the pole faces to each other, in that at least one of the pole pieces is elastically supported and with an intermediate layer, of non-magnetic, precisely worked spacers against the other pole piece is pressed. But then there still remains a slight homogeneity error, the is caused by the finite dimensions of the pole faces. The invention lies the task of making up for this mistake. This happens according to the invention in that there is a current-carrying coil in front of each pole face in the air gap is arranged.

Bei dem in F i g. 1 und 2 schematisch dargestellten Ausführungsbeispiel sind in dem Luftspalt gegenüber jeder Polfläche 121, 122 je eine stromdurchflossene Windung 115, 116 angeordnet.In the case of the one shown in FIG. In the exemplary embodiment shown schematically in FIGS. 1 and 2, a current-carrying winding 115, 116 is arranged in the air gap opposite each pole face 121, 122.

Die Windungen 115, 116 erzeugen magnetische Spiegelbilder, die gestrichelt eingezeichnet und mit 119 und 120 bezeichnet sind.The windings 115, 116 generate magnetic mirror images, which are shown in dashed lines and labeled 119 and 120.

Man kann rechnerisch zeigen, daß, bei geeigneter Dimensionierung der Windungen und der Stromstärke, das magnetische Feld der Windungen 115, 116 und ihrer magnetischen Spiegelbilder 119, 120 den Einiluß der endlichen Abmessungen der Polflächen 121, 122 auf die Homogenität des Feldes gerade kompensieren kann. Zweckmäßigerweise wird dabei die Windung so bemessen, daß ihr Durchmesser kleiner als. der Durchmesser der Polfläche, aber größer als die Breite des Luftspaltes ist.It can be shown mathematically that, with suitable dimensioning of the Windings and the current strength, the magnetic field of the windings 115, 116 and their magnetic mirror images 119, 120 the influence of the finite dimensions of the pole faces 121, 122 can just compensate for the homogeneity of the field. Appropriately the winding is dimensioned so that its diameter is smaller than. the diameter the pole face, but larger than the width of the air gap.

Claims (2)

Patentansprüche: 1. Vorrichtung zur Erzeugung eines homogenen magnetischen Feldes in dem Luftspalt eines Magneten, dadurch gekennzeichnet, daß zur Korrektur der durch die endlichen Abmessungen der Polfläche bedingten Inhomogenitäten in dem Luftspalt je eine stromdurchflossene Spule vor jeder Polfläche angeordnet ist. Claims: 1. Device for generating a homogeneous magnetic Field in the air gap of a magnet, characterized in that for correction due to the finite dimensions of the pole face inhomogeneities in the Air gap each a current-carrying coil is arranged in front of each pole face. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß jede Spule aus einer einzigen kreisförmigen Winddung besteht, deren Durchmesser kleiner als der Durchmesser der Polfläche, aber größer als die Breite des Luftspaltes ist.2. Device according to claim 1, characterized in that each coil consists of a single circular winding whose diameter is smaller than the diameter of the Pole face, but larger than the width of the air gap.
DE1956P0025581 1955-07-22 1956-07-19 Device for generating a homogeneous magnetic field Pending DE1176755B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US1176755A 1955-07-22 1955-07-22

Publications (1)

Publication Number Publication Date
DE1176755B true DE1176755B (en) 1964-08-27

Family

ID=601530

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1956P0025581 Pending DE1176755B (en) 1955-07-22 1956-07-19 Device for generating a homogeneous magnetic field

Country Status (1)

Country Link
DE (1) DE1176755B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5198769A (en) * 1989-09-29 1993-03-30 Siemens Aktiengesellschaft Tesseral gradient coil for a nuclear magnetic resonance tomography apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5198769A (en) * 1989-09-29 1993-03-30 Siemens Aktiengesellschaft Tesseral gradient coil for a nuclear magnetic resonance tomography apparatus

Similar Documents

Publication Publication Date Title
DE1236580B (en) Evidence Store
DE1176755B (en) Device for generating a homogeneous magnetic field
DE1516964C3 (en) Magnetic field probe for measuring more or less magnetic fields
DE629265C (en) DC meter with increased or equalized torque
DE1464269C3 (en) Process for the production of electrically switchable holding magnet systems
DE952530C (en) Arrangement for triggering electrical signals by influencing a magnetic circuit
DE1126025B (en) Electromagnetic measuring mechanism with magnetic restoring force
DE933114C (en) Device for measuring the ratio of two speeds
DE691334C (en) DC ampere-hour counter with a device to counteract the influence of a short circuit on the brake magnets
DE1785244U (en) BISTABLE SWITCHING DEVICE.
DE1297890B (en) Arrangement for measuring mechanical compressive and tensile stresses
DE2319184A1 (en) METHOD AND MACHINE FOR ENERGY CONVERSION DIRECTLY BY THE IMPLEMENTATION OF REVERSIBLE MAGNETIC CORE ELECTRONIC ENERGIEREMANENZ PERMANENT MAGNETIC HARD MATERIALS DIMENSIONS AND VIRTUAL FESTKOERPERATOMENERGIE diamagnetic MATERIAL MEASUREMENTS ON THE CORE PHYSICAL AND INDUCTION ABSORTIONSGRUNDLAGE NUCLEAR CORES AND ELECTROMAGNETIC WAVES IN ELECTRIC POWER INDUCTION
DE754413C (en) Erase head for magnetic sound recordings
DE977906C (en) Process for the compensation of the magnetic disturbance field of units consisting of ferromagnetic components (stoic bodies), especially on ships with non-magnetic outer skin
DE899692C (en) Flat drive magnet for Ferrari devices
DE664902C (en) Method for magnetizing a permanent magnet for moving coil measuring devices with a distorted scale
CH351335A (en) Device for generating a homogeneous magnetic field
DE1020675B (en) Bistable switching element
DE390632C (en) Device for measuring the mechanical force transmitted by a rotating shaft
DE976874C (en) Device to increase the sensitivity and response speed of amplidynes
AT236148B (en) Magnetic storage
DE760218C (en) Device for measuring a constant maximum voltage by means of a proportional low voltage or a proportional low-voltage current
DE1665796C3 (en) Magnetic field-dependent resistor arrangement for measuring, controlling and / or regulating
AT229418B (en) Device for measuring the specific conductivity of semiconductor material
DE1002459B (en) Device for shielding magnetic fields