Determination of the longitudinal relaxation time of a flowing liquid using a differential nuclear magnetic spectrometer

The necessity to measure the longitudinal and transverse relaxation times $T_1$ and $T_2$ simultaneously for the purpose of controlling the state of a flowing liquid was substantiated if flow rate $q$ can vary by two orders of magnitude. A novel method of determining $T_1$ was developed. A differential-type nuclear magnetic spectrometer was designed to employ this method, which allows measuring $T_1$ in the whole range of flow rate $q$. Experimental results are also reported.