Commutation device and control process using the same
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United States of America Patent
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Aug 15, 1995
Grant Date -
N/A
app pub date -
Nov 15, 1993
filing date -
Nov 16, 1992
priority date (Note) -
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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.
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