GB1315777A - Method and apparatus for stabilizing a magnetic field - Google Patents

Method and apparatus for stabilizing a magnetic field

Info

Publication number
GB1315777A
GB1315777A GB3742871A GB3742871A GB1315777A GB 1315777 A GB1315777 A GB 1315777A GB 3742871 A GB3742871 A GB 3742871A GB 3742871 A GB3742871 A GB 3742871A GB 1315777 A GB1315777 A GB 1315777A
Authority
GB
United Kingdom
Prior art keywords
coil
field
negative resistance
magnetic field
magnitude
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.)
Expired
Application number
GB3742871A
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.)
Spectrospin AG
Original Assignee
Spectrospin AG
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 Spectrospin AG filed Critical Spectrospin AG
Publication of GB1315777A publication Critical patent/GB1315777A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F7/00—Regulating magnetic variables

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

1315777 Automatic control of magnetic field SPECTROSPIN A G 10 Aug 1971 [13 Oct 1970] 37428/71 Headings G3R and G3X The magnetic field produced by a coil is stabilized by connecting a negative resistance device across the coil so that current induced in the coil by a disturbance of the field produces a field substantially equal and opposite to the dis- turbance. In the embodiment of Fig. 7, a coil 1 with internal resistance R 1 is connected in series with an operational amplifier 5 provided with positive feedback by resistors R 4 , R 5 , R 6 . The magnitude of the variable resistor R 6 is adjusted so that the equivalent negative resistance of the amplifier equals the resistance R 1 . The magnitude of the field in coil 1 is determined by a current supply 3. In another embodiment, Fig. 8 (not shown), two amplifiers each with one input grounded are connected across the coil. A further embodiment, Fig. 9 (not shown), uses a nuclear magnetic resonance device to detect changes in the field and provide correction signals in addition to the stabilizing action of a negative resistance device. The arrangement may be used in a nuclear magnetic resonance spectrometer.
GB3742871A 1970-10-13 1971-08-10 Method and apparatus for stabilizing a magnetic field Expired GB1315777A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1511170A CH540528A (en) 1970-10-13 1970-10-13 Device for generating a magnetic field by means of one or more coils and for keeping the generated magnetic field constant

Publications (1)

Publication Number Publication Date
GB1315777A true GB1315777A (en) 1973-05-02

Family

ID=4406445

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3742871A Expired GB1315777A (en) 1970-10-13 1971-08-10 Method and apparatus for stabilizing a magnetic field

Country Status (5)

Country Link
US (1) US3673465A (en)
CH (1) CH540528A (en)
DE (1) DE2106051C3 (en)
FR (1) FR2112288B1 (en)
GB (1) GB1315777A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3769554A (en) * 1971-09-15 1973-10-30 Spectrospin Ag Apparatus for varying the strength of a stabilized magnetic field
US3925711A (en) * 1974-08-29 1975-12-09 Us Air Force Series tuned spin coil supply
US4607225A (en) * 1983-07-19 1986-08-19 Regents Of The University Of California Apparatus and method for reducing spurious currents in NMR imaging apparatus induced by pulsed gradient fields
US5225999A (en) * 1990-07-06 1993-07-06 The Trustees Of The University Of Pennsylvania Magnetic environment stabilization for effective operation of magnetically sensitive instruments
US5586064A (en) * 1994-11-03 1996-12-17 The Trustees Of The University Of Pennsylvania Active magnetic field compensation system using a single filter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3080507A (en) * 1961-06-08 1963-03-05 Gulf Research Development Co Apparatus for stabilizing magnetic fields
US3234435A (en) * 1963-07-09 1966-02-08 Bell Telephone Labor Inc Magnetic field stabilizer for a superconductive device
US3389333A (en) * 1964-02-10 1968-06-18 Sperry Rand Corp Control system for maintaining a desired magnetic field in a given space
US3489955A (en) * 1967-09-13 1970-01-13 Honeywell Inc Amplifier apparatus

Also Published As

Publication number Publication date
CH540528A (en) 1973-08-15
DE2106051B2 (en) 1973-02-01
FR2112288A1 (en) 1972-06-16
DE2106051C3 (en) 1975-08-28
FR2112288B1 (en) 1976-09-03
DE2106051A1 (en) 1972-04-20
US3673465A (en) 1972-06-27

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees