Articles | Volume 6, issue 7
Atmos. Meas. Tech., 6, 1673–1683, 2013
Atmos. Meas. Tech., 6, 1673–1683, 2013

Research article 15 Jul 2013

Research article | 15 Jul 2013

Retrieving wind statistics from average spectrum of continuous-wave lidar

E. Branlard1, A. T. Pedersen1, J. Mann1, N. Angelou1, A. Fischer1, T. Mikkelsen1, M. Harris2, C. Slinger2, and B. F. Montes3 E. Branlard et al.
  • 1DTU Wind Energy, Risø Campus, Technical University of Denmark, Roskilde, Denmark
  • 2ZephIR Ltd., The Old Barns, Fairoaks Farm, Hollybush, Ledbury, HR8 1EU, UK
  • 3LM Wind Power, Lunderskov, Denmark

Abstract. The aim of this study is to experimentally demonstrate that the time-average Doppler spectrum of a continuous-wave (cw) lidar is proportional to the probability density function of the line-of-sight velocities. This would open the possibility of using cw lidars for the determination of the second-order atmospheric turbulence statistics. An atmospheric field campaign and a wind tunnel experiment are carried out to show that the use of an average Doppler spectrum instead of a time series of velocities determined from individual Doppler spectra significantly reduces the differences with the standard deviation measured using ordinary anemometers, such as ultra-sonic anemometers or hotwires. The proposed method essentially removes the spatial averaging effect intrinsic to the cw lidar systems.