Patent ID: 8729895
Filing Date: 2014-05-20
Classification: G01R

Abstract:
1. A method for regulating radio frequency (RF) signals in a nuclear magnetic resonance (NMR) system, the NMR system having a spectrometer, a control loop, and an NMR probe head with RF components, the method comprising the steps of: a) transmitting, using a transmitter disposed in the NMR spectrometer, RF signals at measuring frequencies and with a transmission power; b) tuning, using the RF components, an RF oscillating circuit disposed in the NMR probe head to a resonance frequency of a type of nucleus to be investigated; c) utilizing the RF oscillating circuit to excite nuclear spins In a sample and to receive NMR signals resulting from excitation of those nuclear spins, the RF oscillating circuit having at least one RF coil which is disposed around the sample to emit and receive RF signals; d) controlling, using the control loop, a duration, phase and/or power of the transmitted RF signals; e) measuring a parameter using the NMR probe head; f) determining, using the parameter measured In step e), a current in or a voltage across one of the RF components; and g) regulating transmission powers, phases and/or durations of the RF signals in dependence on the parameter measured in step e), wherein the control loop limits the transmission power, maximum permissible current and/or voltage values being determined in at least one of the RF components.