FIELD: measurement technology, ecology, meteorology, physics of atmosphere and other fields of science and technology. SUBSTANCE: characteristic feature of invention lies in usage of additional laser, unit for convergence and change over of beams, acoustooptical modulator with control unit, second beam splitter, power measurement unit and computation unit. EFFECT: expanded functional capabilities of meter thanks to measurement of concentration of substances along route of propagation of laser radiation. 2 dwg
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