FIELD: energy.
SUBSTANCE: invention relates to nuclear power engineering and relates to a system for measuring concentration of boric acid in a first circuit of heat carrier of a nuclear reactor. System comprises two laser radiation sources, measuring and reference cell, photodetector unit, signal processing unit, control unit, laser radiation parameter measuring unit, two laser radiation modulators, three optical switches, three controlled optical attenuators, controlled spectral filter, four fibre-optic lines, five reflecting and five semitransparent mirrors.
EFFECT: technical result consists in improvement of efficiency, safety and accuracy of measurements.
17 cl, 11 dwg, 1 tbl
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