A method for operating a device for the highly precise synchronization of the nmr - transmission frequency to the resonance frequency of an nmr - line taking into account a non-constant hf - phase and corresponding system

摘要

A method for the operation of a synchronization system with a device a and a further device b, both of which are a hf - generator (16; 29), an nmr - transmitter - (10; 20) and reception system (11; 21) as well as a first control loop (15; 28), with which the frequency f_Rf of the hf - generator with the resonant frequency f.₀ a nmr - line can be synchronized, wherein the device is designed in such a way that from the signal of the hf - generator a sequence of excitation pulses (ex) of the repetition frequency f_m can be produced, with the core of one of a specific resonant frequency of an associated nmr - line quasi-continuously (cw) can be excited, and in the times between the excitation pulses - the nmr signal can be received (aq), wherein the period 1 / f_m much smaller than the relaxation time of the nmr - line is selected, and which in the low frequency - region down mixed nmr - signal u_D for this purpose can be used, with the aid of the first control circuit (15; 28) the value of the transmission frequency (29) or the value of the b₀-Field (8) be controlled such that..