METHOD AND LIDAR SYSTEM FOR MEASURING AIR TURBULENCES ON BOARD AIRCRAFT AND FOR AIRPORTS AND WIND FARMS

摘要

The invention relates to a method for measuring air turbulences with a lidarsystem, particularly on board aircraft during which a pulsed expanded laserbeam (12) of a predetermined wavelength is emitted up to a spatial area andlight backscattered from this spatial area is received. At a first point intime t1 and at a second point in time t2 after emitting a laser pulse (L), theintensity distribution in the cross-section of the backscattered light ismeasured, and an air turbulence in a measuring field defined by points in timet1 and t2 is determined from the comparison of both intensity distributions.Images of speckle patterns are recorded with the aid of cameras (21, 22). Anevaluation unit (30) conducts a cross correlation in order to render theturbulence visible and to display it on a monitor (35).