Publishers version - DTU Orbit

Figure 6: CW wind lidars (ZephIRs) under testing at Høvsøre, Risø DTU
Figure 7: Pulsed wind lidars (six WLS7 WindCubes) and one Galion (far back) during testing
at Høvsøre, Risø DTU
1.3.4 Wind profiling
A wind “profiler” measures 10-min averaged quantities of the vertical wind speed profile, the
vertical direction profile, and the vertical turbulence profiles, by combining a series of radial
measured wind speed components from several, and at least three, different beam directions,
into a three-dimensional wind vector. CW-based wind lidars, e.g. the ZephIR, measure the
vertical wind profile at five consecutive heights, selectable in the range from, say 10 to 150 m
height. Pulsed lidars, e.g. the WindCube or the Galion, measure correspondingly the vertical
wind profile simultaneously at several (of the order of 10) heights, in the height interval from
40–∼ 300 m, the upper bound depending on the amount of aerosols in the air.
True for all wind profilers in the wind energy market, however, CW and pulsed lidars
irrespectively, is that they rely during combining measured radial wind speeds into a single
wind vector on the assumption that the flow over the wind lidar is strictly homogeneous.
Homogeneous wind flow means that the air stream is unaffected and not influenced by hills,
DTU Wind Energy-E-Report-0029(EN) 21