Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1996-07-31
1999-05-18
Shah, Kamini
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01V3/00
Patent
active
059053771
ABSTRACT:
Time-varying error between a prescribed magnetic field and an actual magnetic field is identified from a self-encoding technique and the measurement of detected responses to various magnetic read-out gradients. The gradients can be a sinusoidal, step function, or other suitable form which enables the actual responses to be obtained from which transfer functions can be defined. In one embodiment, the data can effectively frequency sample the transfer function of the system. A gradient-recalled echo occurs each time the self-encode lobe is refocussed, and the phase of the echo peak is used to estimate the time variation of the main magnetic field, B.sub.0 (t).
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Kerr Adam B.
Pauly John M.
Board of Trustees of the Leland Stanford Junior University
Shah Kamini
Woodward Henry K.
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