Commutation device and control process using the same

Details Commutation device and control process using the same Commutation device and control process using the same

1993-11-15

1995-08-15

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01V 300

Patent

active

054422914

ABSTRACT:
Commutation device to connect and disconnect a current or voltage generator and a coil adapted to create a gradient of magnetic field in a measurement chamber of an NMR apparatus. The device comprises a switch (1) mounted in the supply circuit (2) of the coil (3), actuated by a control signal and adapted, in open position, to isolate totally the coil (3) from the generator (4). The switch is a double switch (1) adapted to separate, upon opening, the supply circuit (2) into a portion (5) connected to the generator (4) and a portion (6) connected to the coil (3), independently of each other. Alternatively the switch can be a high speed switch comprising at least one field effect transistor. The process for controlling the action of the coil comprises, at the end of an excitation phase and just before a measurement phase, sending an opening signal to the switch (1) so as to disconnect and to isolate from each other the generator (4) and the coil (3) and then, after a predetermined time lag, to trigger a measurement phase.

REFERENCES:
patent: 4628264 (1986-12-01), Rzedzian
patent: 5285161 (1994-02-01), Rzedzian et al.
patent: 5298863 (1994-03-01), Nowak et al.

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