FIELD: electrical engineering.
SUBSTANCE: proposed method relates to electrical measurements and can be used for monitoring changes in integral composition of a substance in chemical industry, mining industry, in systems for monitoring exhaust gases of internal combustion engines, or in similar complex systems, where there is the critical task of monitoring changes in integral composition of a substance being in any aggregate state. Monitoring changes of integral composition of a substance is based on measuring changes in phase progression of a microwave signal in its multiple distribution through a volume of the controlled substance. Each passage of electromagnetic oscillations through the controlled substance is characterized by an artificially introduced frequency shift of the microwave oscillations by a certain value. After homodyne conversion in the microwave mixer of initial microwave oscillations and transformed by frequency oscillations passed through the substance at the output of the mixer there is a series of combination low-frequency difference components, of which one is selected determined by the required ratio of the passage of microwave oscillations through the substance. Accuracy of measuring changes in integral composition of the substance is high and in general case it is directly proportional to the number of passes of the microwave oscillations through the controlled substance of a known linear size.
EFFECT: system built and functioning as per the proposed method allows measuring integral composition of a substance being in any aggregate state, and, in contrast to short-lived thermochemical, expensive optical, catalytic and other analyzers, is resistant to dust and contaminants, is not characterized by ageing of the system elements.
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