FIELD: physics.
SUBSTANCE: extended pulsed laser beam (12) with given wavelength is emitted towards the required region of space and light scattered from said region is received, wherein at a first time instant t1 and at a second time instant t2 after emission of a laser pulse (L), intensity distribution in the cross section of the stream of scattered light is measured and by comparing two intensity distribution values, atmospheric turbulence in the measurement field, defined by time instants t1 and t2, is determined. Speckle images are taken using a camera (21, 22). A data processing unit (30) establishes cross correlation of images for viewing turbulence and its display on a monitor (35).
EFFECT: invention enables detection of non-uniformity and movement of air on a large area.
22 cl, 6 dwg
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