FIELD: measurement equipment.
SUBSTANCE: invention relates to the field of building Doppler lidars and laser Doppler speed meters designed for measurement of wind speed and detection of turbulent processes in atmosphere. The method consists in modulation of a probing beam with the help of harmonic function, detection of reflected or scattered light by a photodetector, and identification of the main harmonic of the detected signal, which is compared to a modulating signal by means of their multiplication in a radio frequency multiplier. A complex signal of differential (new Doppler) frequency is generated, proportionate to speed, which is subject to measurement.
EFFECT: invention makes it possible to increase spatial resolution, stability and reliability of measurements, to increase distance of investigated zone probing, as well as to simplify an optical circuit.
4 cl, 3 dwg
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