LASER DOPPLER VELOCIMETER Russian patent published in 2017 - IPC G01P3/36 

FIELD: measuring equipment.

SUBSTANCE: laser doppler velocimeter contains radiation source of two spatially superposed laser beams, the first lens, Bragg acousto-optic modulator of traveling wave, the second lens, first Wollaston prism, optical shaper of probing field, first light-sensitive detector, achromatic half-wave retarder, first and second half-wave dispersion retarders, first and second half-wave retarders, collimator, axicon, second and third Wollaston prisms, confocal lens system, chromatic filter, dichroic mirror, second light-sensitive detector.

EFFECT: increase in the accuracy of measurements is achieved through the use of Bessel beams, which ensure the uniformity of the spatial-frequency structure of probing field and the reduction of measuring volume.

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