The adaptive temporal NMR flowmeter

Abstract

This article describes a method for flow measurement of liquids containing protons. Measurements are made using by method of interaction with the test medium in a non contact manner using fields that penetrate through the wall of the pipeline. This method is based on the effect of the nuclear magnetic resonance (NMR). The structural scheme of single-coil NMR marker-type flowmeter with a division processes of creating and reading markers in the flow. This flow meter is able to modify the size of the analyzer by switching sections in the coil of registration, which leads to higher accuracy and expand the measurable flow diapason. Also included is the description of the data processing system for change a frequency setting marker in the flow. The frequency setting of marker depends on the relaxation time substances and motion marker of NMR on the measurement portion. The calculations take into account the velocity distribution depending on the flow mode and the additional magnetization in the measuring portion. The present method of construction of the primary device and registration system allows for short periods of time to process the information received and to adapt the whole system when changing the composition of the liquid or its speed of movement.