RELAXATION AERODISPERSE FLOW LASER SENSING INTEGRAL METHODS STUDIES
This report presents the results of research on a special stand the dust. To investigate the dependence of the optical parameters obtained aerodispersed flow was collected installation realizes the possibility of laser sensing Aerodisperse flow at several wavelengths simultaneously in a spectral transmittance and light scattering integral. It is shown that in a special dust stand in a closed flue stabilization provided uniform distribution of aerosol over the entire volume on the tenth second after pulsed injection into the flow of the aerosol powder that makes this point in time to carry out such studies aerodispersed flows. To conduct simultaneous investigations of such flows methods of spectral transparency and integral scattering an automated experimental setup based on three semiconductor lasers with wavelengths of 405, 532 and 650 nm... reached the desired increase in the amplitude resolution and measurement accuracy due to: simultaneous sensing of total measuring volume flow of the test at three different wavelengths; double-pulse modulation of laser radiation and thus double synchronous detection measurement signals; presence of the reference channel, built in the same channel with the measuring circuit; using a common photodetector for all wavelengths in each method; control the parameters of laser radiation and the sensitivity of photodetectors, providing optimization of the ADC. It was found that the dynamics of the signal scattering and attenuation of laser radiation by aerosol particles at all wavelengths is consistent with the results of calculations based on the Mie scattering theory with a coefficient of determination of at least 0,97, which confirms the adequacy of the models used in this work.