Device and method for adjusting a radiofrequency antenna of a nu

Details Device and method for adjusting a radiofrequency antenna of a nu Device and method for adjusting a radiofrequency antenna of a nu

1988-04-08

1989-06-27

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324322, G01N 2402

Patent

active

048433233

ABSTRACT:
A device and method are provided for adjusting a radiofrequency antenna of a nuclear magnetic resonance apparatus. In the invention, using capacities preset in the factory, the antenna detuning of an NMR apparatus is limited to a range such that the standing wave rate of a high frequency line which conveys the radiofrequency signal is limited. This line is cut and, at a short distance, a tuning adjustment circuit is inserted. This circuit may be automated: the electric adjustment motors, thus spaced away, do not disturb the magnetic fields of the apparatus. By measuring the real part of the admittance at the input of the adjustment circuit and the phase shift between voltage and current this circuit can be adjusted.

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patent: 4602213 (1986-07-01), Sugiura
Journal of Physics E-Scientific Instruments, vol. 14, No. 6, Jun. 1981, pp. 700-701, The Institute of Physics, London, GB; M. Peric et al.: "Simple RF Matching for NMR Coils in Endor Spectrometers".
Cross, V. R. et al., "Single Coil Probe with Transmission-Line Tuning for Nuclear Magnetic Double Resonance".

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