Method and device for compensating of field disturbances in magn

Details Method and device for compensating of field disturbances in magn Method and device for compensating of field disturbances in magn

1992-07-07

1994-04-12

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, 324317, G01V 300

Patent

active

053028996

ABSTRACT:
In a method for compensation of time variant field disturbances in magnetic fields of electromagnets with high field-homogeneity, in particular in sample volumes of superconducting electromagnets for measurements of magnetic resonance, the dispersion signal u.sub.x of the nuclear signal of a reference substance is acquired and taken into consideration for compensation by generation of a current dependent on the dispersion signal in a field correction coil of the electromagnet. The method is characterized in that the absorption signal u.sub.y of the reference substance is additionally acquired and that the compensation is carried out in dependence on the quantity u.sub.x /u.sub.y and/or (1/u.sub.y)(du.sub.x /dt). These are substantially independent of many influencing quantities.

REFERENCES:
patent: 5218299 (1993-06-01), Dunkel
Journal of Physics E. Scientific Instruments, vol. 2, No. 10, Oct. 1, 1969, Ishing, Bristol, GB.
M. Birkle et al.: "Modulation effects and their application in high resolution nuclear spectrometers".
Review of Scientific Instruments, vol. 46, No. 5, May 1, 1975, New York US.
B. W. Bangerter: "Field/frequency lock monitor for signal averaging with high resolution NMR spectrometers".
Journal of Physics E. Scientific Instruments, vol. 9, No. 4, Apr. 1, 1976, Ishing, Bristol GB.
J. K. Hulbert: "A field tracking digital NMR magnetometer for in situ use with superconducting solenoids".

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