Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1987-08-14
1988-11-29
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
335299, G01R 3320
Patent
active
047885025
ABSTRACT:
An apparatus is employed to compensate for time-variant field interference in magnetic fields of electromagnets with high field homogeneity, in particular in specimen areas of superconductive electromagnets for measurements of magnetic resonance. The magnetic field that permeates a specimen area of the electromagnet is identified by means of at least one induction coil, a voltage induced in the induction coil is supplied to a control stage, and a compensating current that flows through a compensating coil that surrounds the specimen area is set by means of an output signal from the control stage. In order to be able to compensate for remote interference emanating from far outside the magnet, at least one compensating coil and at least two induction coils, or vice versa, are disposed. Disposed in the control stage is either a voltage adder, to which the induced currents of the at least two induction coils can be supplied and differently weighted, or a current divider, which supplies differently weighted compensating currents to at least two compensating coils. The induction voltages or compensating currents can be weighted as a function of frequency.
REFERENCES:
patent: 4284950 (1981-08-01), Burl
patent: 4652826 (1987-03-01), Yamamoto
patent: 4670716 (1987-06-01), Kunz
patent: 4680551 (1987-07-01), O'Donnell
patent: 4689591 (1987-08-01), McDougall
Keller Anton W.
Kuster Anton
Tschopp Werner H.
LandOfFree
Apparatus for compensating for time-vibrant field interference i does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for compensating for time-vibrant field interference i, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for compensating for time-vibrant field interference i will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-365945