METHOD FOR MONITORING THE LONGITUDINAL RELAXATION TIME OF FLOWING LIQUIDS OVER THE ENTIRE RANGE OF FLOW RATE MEASUREMENTS

摘要

The problems of monitoring the state of flowing liquids used in various branches of industry, power production, and agriculture are examined. Means of monitoring the state of flowing liquids based on the phenomenon of nuclear magnetic resonance are discussed. These devices are free of the shortcomings and limitations inherent in the use of optical analyzers and flow-through refractometers. When monitors based on nuclear magnetic resonance are used, the monitored parameters are the relaxation times of the flowing liquid; in particular, the greatest difficulties arise when measuring the longitudinal relaxation time. A method is proposed for monitoring the longitudinal relaxation time of a flowing liquid over the entire range within which its flow rate is measured. A design for a nuclear-magnetic flowmeter-relaxometer is developed for implementation of the new method. The obtained data are compared with measurements of steady-state longitudinal relaxation times of liquid media in a commercial nuclear-magnetic relaxometer; these measurements coincide to within the measurement error.