FIELD: physics.
SUBSTANCE: method of measuring a velocity field involves emitting coherent unmodulated radiation in different probing directions, detecting radiation scattered by irregularities carried by the velocity field and picking up Doppler signals caused by movement of the irregularities. The method is characterised by that detection of radiation scattered by irregularities and picking up Doppler signals is carried out in different directions repeatedly (in cycles), with delay which is not shorter than the change-over time of irregularities in the measured region. For each cycle, the spatial distribution of irregularities is obtained based on the total power of Doppler signals in different probing directions, and the velocity field is determined from the correlation between spatial distribution of irregularities and spectral density of Doppler signals.
EFFECT: high accuracy of measuring velocity field.
1 dwg
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