Inspection apparatus using magnetic resonance

Details Inspection apparatus using magnetic resonance Inspection apparatus using magnetic resonance

1994-10-07

1997-02-04

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324319, G01V 300

Patent

active

056002459

ABSTRACT:
An inspection apparatus using magnetic resonance includes magnetic field generators for generating a static magnetic field, a gradient magnetic field and a radio frequency magnetic field, respectively, a signal detector for detecting magnetic resonance signals from an inspected object, a computer for executing arithmetic operations for detection signals from the signal detector and an output device of the result of the arithmetic operations by the computer. The gradient magnetic field generator includes first and second gradient coils, the first gradient coil is a coil fixed to a magnet for generating a static magnetic field, the second gradient coil is a movable coil, and the magnetic field generated by the second gradient coil at a conducting portion of the magnet is offset by the magnetic field generated by the first gradient coil. According to this construction, an eddy current that occurs with the time change of the gradient magnetic field can be reduced.

REFERENCES:
patent: 5311134 (1994-05-01), Yamagata et al.
patent: 5337001 (1994-08-01), McDougall et al.
patent: 5372137 (1994-12-01), Wong et al.
patent: 5399969 (1995-03-01), Bernstein

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