FIELD: physics.
SUBSTANCE: method for optical determination of a component, mainly hydrogen sulfide, and its concentration in a gas flow involves irradiating a sample of the test gas using laser radiation with different wavelengths, at which luminescent radiation in the UV or visible range is combined with the laser radiation in the near IR range to achieve threshold of intensity at which stimulated Brillouin scattering effect arises with the formation of Stokes components. Then, the spectral distribution of the intensity of the radiation passing through the sample is recorded, the excess of the received signal is determined above the threshold noise level and the absolute values of the obtained peaks and the main maximum corresponding to the laser radiation are compared. The sample of the test gas is irradiated in a gas analyzer chamber filled with water, which temperature is maintained in the range of 80-85°C. The presence of the component is identified by the frequency of the radiation maximum obtained as a result of stimulated Brillouin scattering, and its concentration is defined as the intensity logarithm of the Stokes component. The gas analyzer is placed directly in the gas flow zone, and at least one solid-state laser with semiconducting pumping built into the gas analyzer chamber is used as the laser irradiation source. The wavelength of the laser radiation in the UV and visible range is chosen within 200-530 nm, and in the near IR range - 810-1200 nm.
EFFECT: possibility to determine the component, mainly hydrogen sulphide, and its concentration in the gas flow with high accuracy, and continuous process monitoring.
4 cl, 4 dwg
