Abstract
Time-resolved light diffraction of cw read-out laser radiation by electrostrictive laser-induced gratings (LIGs) is demonstrated to be applicable, under a special experimental arrangement, for non-intrusive, local, and remote simultaneous measurements of velocity and temperature in gas flows. The experimental set-up and the model developed for adequate description of the experimental results are described. The method for treating the data and estimating the experimental parameters is reported.
The demonstrative, proof-of-principle experiments were performed under stationary flow conditions in plane submerged heated air jet in atmosphere at ambient pressure and temperature. Phase-sensitive detection of the diffracted light was accomplished by superimposing two signal beams, whose frequencies were Doppler-shifted by the movement of the grating together with the flow. Flow velocities in the range 10–160 m/s and temperatures between ambient and 600 K were measured, and profiles of the corresponding values along and across the jet were demonstrated to be obtainable. In addition to velocity and temperature values, characteristic longitudinal and transversal spatial distributions of such a parameter as a LIG signal decay time were obtained. These data may provide information on the turbulent movement inside the flow and on the jet structure.
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42.62.-b; 47.62.+q; 43.58.+z
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Kozlov, D. Simultaneous characterization of flow velocity and temperature fields in a gas jet by use of electrostrictive laser-induced gratings. Appl. Phys. B 80, 377–387 (2005). https://doi.org/10.1007/s00340-004-1720-2
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DOI: https://doi.org/10.1007/s00340-004-1720-2