SPECTRAL METHOD OF DETECTION OF LASER DOPPLER VELOCIMETER SIGNALS IN TURBULENT FLOWS
A. V. Klimov, V. G. Meledin, Yu. A. Anikin, D. V. Kulikov, S. V. Krotov, I. K. Kabardin
Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, prosp. Akademika Lavrent'eva, 1
Keywords: детектирование сигнала, неравномерное детектирование, отношение сигнал/шум, спектральный метод, лазерный доплеровский измеритель скорости, турбулентный газожидкостный процесс, signal detection, nonuniform detection, signal/noise ratio, spectral method, laser Doppler velocimeter, turbulent gas-liquid process
Abstract
A spectral method of detection of laser Doppler velocimeter signals in turbulent flows is proposed. The method is based on estimating the signal/noise ratio adapted to the width of the signal power spectral density and comparing its value with the recognition threshold. Numerical simulations show that the error of the signal/noise ratio estimates is 1 % for different velocities of the turbulent flow. Physical experiments aimed at measuring turbulent aerodynamic processes show that the proposed method offers a possibility of eliminating the errors of calculating the mean value and the velocity scatter equal to 15 and 78 % by means of eliminating the signals with low signal/noise ratios from the processing system. Application of the proposed method also ensures lower irregularity of the signal/noise ratio estimates than that ensured by the famous method developed by Tropea for a wide range of turbulent velocities.
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