Conclusion
The method described in this paper permits to locate with high accuracy a LDA measuring volume relatively to a wall by means of a microthermocouple. In addition, this method allows to balance the intensities of the two laser beams and to control the exact size of the ellipsoid. When the LDA system is employed for two components measurements, this procedure permits to verify the coincidence of the two measuring volumes. This technique can also be used in laser tomography to locate, with high accuracy, a light sheet parallel to a wall (visualization of boundary layers).
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References
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Bertrand, C., Desevaux, P. & Prenel, J.P. Micropositioning of a measuring volume in laser Doppler anemometry. Experiments in Fluids 16, 70–72 (1993). https://doi.org/10.1007/BF00188510
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DOI: https://doi.org/10.1007/BF00188510