Scientific journal
Scientific Review. Technical science
ISSN 2500-0799
ПИ №ФС77-57440

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ACOUSTO-OPTIC SWITCH OF OPTICAL MEASURING CHANNELS OF LASER DOPPLER ANEMOMETERS

Pavlov V.A. 1 Bakakin G.V. 1 Glavniy V.G. 1 Krotov S.V. 1 Kulikov D.V. 1 Rahmanov V.V. 1 Sadbakov O.Y. 1
1 Institute of thermophysics SB RAS
The development of modern fundamental research in the field of hydro and aerodynamics connected with use modern diagnostic and instrumental base. Laser Doppler anemometers allow to non-invasively receiving accurate information about components of the velocity vector of investigated flow in the small area of measurement. Simultaneous measurement of two orthogonal components of the velocity vector is usually executed by laser anemometry, having a dual structure with the division of the laser radiation power between the channels. The disadvantage of these devices is low efficiency of using laser radiation power, because measuring one velocity component optical channel have less than half of laser source energy. Application of switching of optical-electronic measuring channels of laser Doppler anemometers allows to raise essentially the relation a signal/noise and accuracy of measurements. Implementation of a switching mode is interfaced to necessity of the decision of some problems. The developed acousto-optic switchboard provides the synchronous switching of laser probing bundles and the electronic signal processor and low level of switching noises in optical and electronic measuring channels, it possesses high high-speed performance. Application of the developed acousto-optic switchboard of optical measuring channels in LAD-0xx laser Doppler anemometers provided a range of measured speeds on two components ± 0,01 … 200 mps with the average rate measurements error ± 0,5%.