WO1992019978A1 - Spectometres rmn/rqn portables - Google Patents

Spectometres rmn/rqn portables Download PDF

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Publication number
WO1992019978A1
WO1992019978A1 PCT/GB1991/000681 GB9100681W WO9219978A1 WO 1992019978 A1 WO1992019978 A1 WO 1992019978A1 GB 9100681 W GB9100681 W GB 9100681W WO 9219978 A1 WO9219978 A1 WO 9219978A1
Authority
WO
WIPO (PCT)
Prior art keywords
spectrometer
squid
claijned
superconducting
liquid nitrogen
Prior art date
Application number
PCT/GB1991/000681
Other languages
English (en)
Inventor
Paul Jonsen
Original Assignee
Datalight Limited
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
Priority claimed from GB878711114A external-priority patent/GB8711114D0/en
Application filed by Datalight Limited filed Critical Datalight Limited
Priority to PCT/GB1991/000681 priority Critical patent/WO1992019978A1/fr
Priority to EP19910908574 priority patent/EP0582564A1/fr
Publication of WO1992019978A1 publication Critical patent/WO1992019978A1/fr

Links

Classifications

    • 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
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/323—Detection of MR without the use of RF or microwaves, e.g. force-detected MR, thermally detected MR, MR detection via electrical conductivity, optically detected MR
    • G01R33/326—Detection of MR without the use of RF or microwaves, e.g. force-detected MR, thermally detected MR, MR detection via electrical conductivity, optically detected MR involving a SQUID
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/035—Measuring direction or magnitude of magnetic fields or magnetic flux using superconductive devices
    • G01R33/0354—SQUIDS
    • G01R33/0356—SQUIDS with flux feedback
    • 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
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/441—Nuclear Quadrupole Resonance [NQR] Spectroscopy and Imaging
    • 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
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/46—NMR spectroscopy

Definitions

  • the typical dc SQUID is a small device.
  • conventional dc SQUID'S operate at liquid Helium temperatures (4.2K).
  • To construct a NMR or NQR Spectrometer requires a helium cryostat in which to hold the SQUID and detection systems. In order to achieve adequate shielding and supply of liquid helium, this cryostat is quite large and not portable.
  • the SQUID detector has to be placed within a Faraday cage.
  • a NMR or NQR Spectrometer incorporates a superconducting quantum interference device made from a material whose superconducting transition temperature is above the boiling point of liguid nitrogen (ie 77K) .
  • the preferred equipment required would be: (a) high temperature (above 77K) dc SQUID; (b) container for liquid nitrogen cryogen; (c) tuned circuit for the observation of the frequencies of interest; (d) sample coil, within the tuned circuit; (e) dc magnet coil and power supply, battery or mains powered; (f) preamplifier for further amplification of the observed signal; (g) small computer to control the pulsing of the dc magnetic field and acquisition of data; (h) disk drive (floppy) for the transfer of data for manipulation on a larger computer; and (i) casing, which also screens the dc SQUID from stray radio fre «quency fields.
  • FIG. 1 is a block diagram of a Spectrometer incorporating a SQUID in accordance with the present invention.
  • Figure 2 is an enlarge view of the tuned circuit arrangement used in the Spectrometer shown in
  • a NMR/NQR spectrometer 10 which operates at liquid nitrogen temperatures is shown within the confines of a portable box 12 which also constitutes the Faraday shielding for the spectrometer.
  • a liquid nitrogen cryogen container 14 Inside the spectrometer 10, a liquid nitrogen cryogen container 14, a dc power supply 16 and a computer 18 are arranged interconnected with each other.
  • the container 14 incorporates a high temperature dc SQUID 19 and a circuit arrangement 21.
  • the circuit arrangement 21 (shown in detail in Figure 2) comprises a dc magnet coil 20 around a sample area 22, a tuned circuit 24 for the observation of the frequencies of interest, and a sample coil 26 within the tuned circuit.
  • An access cover 28 and access passage 30 in the box 12 are provided to allow a sample to be placed in the sample area 22.
  • One end of the SQUID 19 is connected to earth (see 32) while the other end of the SQUID 19 is connected to the computer 18 and power supply 16.
  • the observed signal from the SQUID 19 passes through a preamplifier 34 for further amplification prior to reaching the computer 18 for firstly data ac «guisition and storage and secondly to control the pulsing of the dc magnetic field (by means of an. electronic switch).
  • the computer 18 also includes a disk drive for the transfer of data for manipulation on a larger computer.
  • the dc power supply 16 meanwhile is also connected to either a battery or mains (see 36) .
  • the SQUID 19 in particular is a high temperature SQUID (ie between 77K and 125K, or more particularly one which operates at above 77K) and is preferably made from mixed oxides of a Lanthanide/rare earth, copper and barium.
  • the SQUID 19 consists of two high temperature Josephson Junctions 44 and 46.
  • the container 14 meanwhile holds liquid nitrogen at room temperatures because the container is a styrofoam container.
  • L 3 is the coil which creates the magnetic flux detected by the dc SQUID 19.
  • L_ is the sample coil (shown around a sample 37) and L, has the same number of turns arranged in an opposite manner as to negate any transient voltages created by the pulsing of the dc - 6 -
  • magnet coil 20 A further method of matching these coils may be necessary if the sample alters the inductance of L ⁇ .
  • a capacitor 38, resistor 40 and series high temperature Josephson Junction 42 are provided.
  • the Josephson Junction 42 becomes resistive when the dc pulse is applied and so serves to protect the dc SQUID further.
  • the dc SQUID is made from high temperature superconductor material, and preferable is made from mixed oxides of a Lanthanide/rare earth, copper and barium.
  • the dc magnet coil 20, tuning circuit 24, sample 37 and dc SQUID 19 are all immersed in the liquid nitrogen cryostat.
  • the sample 37 would be placed in position by lowering through an opening at the top of the cryostat 16, which is also used to fill with liquid nitrogen.
  • a cap must be placed over this orifice when the Spectrometer is in operation. Uses of such a Spectrometer would be envisaged to be in routine organic laboratories, hospitals (sample would be solid at 77K) , and possibly in other fields such as oil exploration.
  • SUBSTITUTESHEET Daye and Grimes point-contact SQUIDS
  • various hybrid combinations of thin film and point-contact SQUIDS may be either single junction RF-biased type or double junction DC SQUIDS.

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Superconductor Devices And Manufacturing Methods Thereof (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

On décrit un spectomètre RMN/RQN incorporant un dispositif d'interférence quantique supraconducteur (DIQS) fabriqué à partir d'un matériau dont la température de transition supraconductrice est supérieure au point d'ébullition de l'azote liquide (c'est-à-dire 77 K).
PCT/GB1991/000681 1987-05-11 1991-04-29 Spectometres rmn/rqn portables WO1992019978A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/GB1991/000681 WO1992019978A1 (fr) 1987-05-11 1991-04-29 Spectometres rmn/rqn portables
EP19910908574 EP0582564A1 (fr) 1991-04-29 1991-04-29 Spectometres rmn/rqn portables

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878711114A GB8711114D0 (en) 1987-05-11 1987-05-11 Spectrometers
PCT/GB1991/000681 WO1992019978A1 (fr) 1987-05-11 1991-04-29 Spectometres rmn/rqn portables

Publications (1)

Publication Number Publication Date
WO1992019978A1 true WO1992019978A1 (fr) 1992-11-12

Family

ID=26292231

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/000681 WO1992019978A1 (fr) 1987-05-11 1991-04-29 Spectometres rmn/rqn portables

Country Status (1)

Country Link
WO (1) WO1992019978A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005081002A2 (fr) * 2003-10-23 2005-09-01 E.I Dupont De Nemours And Company Procede d'identification biologique utilisant la resonance quadripolaire nucleaire amelioree par supraconducteur a temperature elevee
US7106058B2 (en) 2003-11-12 2006-09-12 E.I. Dupont De Nemours And Company Detection of contraband using nuclear quadrupole resonance
US7248046B2 (en) 2004-04-15 2007-07-24 E. I. Du Pont De Nemours And Company Decoupling high temperature superconductor sensor arrays in nuclear quadrupole resonance detection systems
US7265549B2 (en) 2004-04-30 2007-09-04 E. I. Du Pont De Nemours And Company Scanning a band of frequencies using an array of high temperature superconductor sensors tuned to the same frequency
US7279896B2 (en) 2004-04-30 2007-10-09 E. I. Du Pont De Nemours And Company Methods and apparatus for scanning a band of frequencies using an array of high temperature superconductor sensors
US7279897B2 (en) 2004-04-30 2007-10-09 E. I. Du Pont De Nemours And Company Scanning a band of frequencies using an array of high temperature superconductor sensors tuned to different frequencies
US7292041B2 (en) 2003-11-24 2007-11-06 E.I. Du Pont De Nemours And Company Q-damping circuit including a diode acting as a resistor for damping a high temperature superconductor self-resonant coil in a nuclear quadrupole resonance detection system
US7301344B2 (en) 2003-11-24 2007-11-27 E.I. Du Pont De Nemours & Co. Q-damping circuit including a high temperature superconductor coil for damping a high temperature superconductor self-resonant coil in a nuclear quadrupole resonance detection system
US7332910B2 (en) 2003-11-24 2008-02-19 E.I. Du Pont De Nemours And Company Frequency detection system comprising circuitry for adjusting the resonance frequency of a high temperature superconductor self-resonant coil

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777443A (en) * 1986-11-14 1988-10-11 Hitachi, Ltd. Inspection apparatus based on nuclear magnetic resonance
JPH01131050A (ja) * 1987-11-13 1989-05-23 Seiko Instr & Electron Ltd 超電導材料
EP0327123A2 (fr) * 1988-02-05 1989-08-09 Hitachi, Ltd. Squid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777443A (en) * 1986-11-14 1988-10-11 Hitachi, Ltd. Inspection apparatus based on nuclear magnetic resonance
JPH01131050A (ja) * 1987-11-13 1989-05-23 Seiko Instr & Electron Ltd 超電導材料
EP0327123A2 (fr) * 1988-02-05 1989-08-09 Hitachi, Ltd. Squid

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
CRYOGENICS. vol. 29, no. 3, March 1989, GUILDFORD GB pages 155 - 156; D.M.S. BAGGULEY ET AL.: 'NOVEL MAGNETOMETER USING CERAMIC SUPERCONDUCTING MATERIAL AS PROBE' see the whole document *
REVIEW OF SCIENTIFIC INSTRUMENTS. vol. 61, no. 3, March 1990, NEW YORK US pages 1059 - 1063; C.CONNOR ET AL.: 'Magnetic resonance spectrometer with a dc SQUID detector' *
see Section I. *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005081002A2 (fr) * 2003-10-23 2005-09-01 E.I Dupont De Nemours And Company Procede d'identification biologique utilisant la resonance quadripolaire nucleaire amelioree par supraconducteur a temperature elevee
WO2005081002A3 (fr) * 2003-10-23 2005-10-13 Du Pont Procede d'identification biologique utilisant la resonance quadripolaire nucleaire amelioree par supraconducteur a temperature elevee
US7148684B2 (en) 2003-10-23 2006-12-12 E.I. Du Pont De Nemours And Company Method for biological identification using high temperature superconductor enhanced nuclear quadrupole resonance
US7106058B2 (en) 2003-11-12 2006-09-12 E.I. Dupont De Nemours And Company Detection of contraband using nuclear quadrupole resonance
US7292041B2 (en) 2003-11-24 2007-11-06 E.I. Du Pont De Nemours And Company Q-damping circuit including a diode acting as a resistor for damping a high temperature superconductor self-resonant coil in a nuclear quadrupole resonance detection system
US7301344B2 (en) 2003-11-24 2007-11-27 E.I. Du Pont De Nemours & Co. Q-damping circuit including a high temperature superconductor coil for damping a high temperature superconductor self-resonant coil in a nuclear quadrupole resonance detection system
US7332910B2 (en) 2003-11-24 2008-02-19 E.I. Du Pont De Nemours And Company Frequency detection system comprising circuitry for adjusting the resonance frequency of a high temperature superconductor self-resonant coil
US7248046B2 (en) 2004-04-15 2007-07-24 E. I. Du Pont De Nemours And Company Decoupling high temperature superconductor sensor arrays in nuclear quadrupole resonance detection systems
US7265549B2 (en) 2004-04-30 2007-09-04 E. I. Du Pont De Nemours And Company Scanning a band of frequencies using an array of high temperature superconductor sensors tuned to the same frequency
US7279896B2 (en) 2004-04-30 2007-10-09 E. I. Du Pont De Nemours And Company Methods and apparatus for scanning a band of frequencies using an array of high temperature superconductor sensors
US7279897B2 (en) 2004-04-30 2007-10-09 E. I. Du Pont De Nemours And Company Scanning a band of frequencies using an array of high temperature superconductor sensors tuned to different frequencies

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