Poster - An Innovative Compact lidar for by oaw14128


                        An innovative and compact 1.5 m lidar for the wind industry
                                                                                    R. Parmentier, L. Sauvage, C. Aussibal, I.S. Stachlewska, M. Lardier
                                                                                        Leosphere, Bat. 503, Centre Scientifique d’Orsay, Plateau du Moulon, 91400 ORSAY, France

                                                                                                                      J-P. Cariou, M. Valla
                                                                                                                 ONERA/DOTA, 91100 Palaiseau, France

                                                                                                                 I. Antoniou, M.S. Courtney
                                                            Wind Energy Department, Risoe National Laboratory, Technical University of Denmark, Frederiksborgvej 399, P.O. Box 49, DK-4000 Roskilde - Denmark

                                           Windcube TM       real-                    it’          setup,
                                                    is a new real-time wind profiler, it’s fast to setup,
                                    EZ to configure and compatible with months of unattended operation
                                                                                                                                                                                                                                                               Aerosols                     r
                              WindCubeTM       Key benefits                                                                                                                                                                                                                                Vr
                                                                                                                     EXTREME CONDITIONS                                                                                                                                                                   r
Pulsed Lidar                       simultaneous, steady performances vs. altitude

                                   eye-safe; silent and discreet instrument                                                                                                                                                                                          ωl                     Range resolved
1.5 µm fibre laser source          reliable, robust, low maintenance telecom components                                                                                                                                                                                           ωl + 2π fd measurement

                                   10 min U, V, W, Vh, Direction
User-friendly software             σU , σV , σW , σVh                                                                                                                                                                                                                                           Doppler shift


                                   Vhmin, Vhmax                                                                                                                                                                                                                                                   fd =

                                                                                                                                                                                                                                                                     l es

                                                                                                                                                                                                                                                   Laser                      Interferometer        Receiver
Advanced signal processing         leading to state of the art compatible measurement accuracy
                                                                                                                                                                                                                                                           Local Oscillator                        Processing

    WindCubeTM specifications                                                                                                                                                      COMPACT,
                                                                                                                                                                           SILENT & DISCREET                                                           Pulsed Doppler Coherent lidar basics
                                                                                                                                                                                                                                  A laser pulse is sent through the atmosphere. All along its path, light is scattered
                                                                                                                                                                                                                                    by aerosols, dusts, water drops… We collect backscattered light and make it
                                                                                                                                                                                                                                  interfere with an optical local oscillator. Optical signal is digitized and processed
                                                                                                                                                                                                                                      to retrieve Doppler shift induced by aerosols’ motion. This is an absolute
                                                                                                                                                                                                                                    measurement of radial wind speed in the lidar line of sight. Range resolution
                                                                                                                                                                                                                                                       comes from pulse propagation vs. time.

    10min average Lidar horizontal wind speed compared to RISØ cup anemometers

                                                                                                                                                                                                                                                              3D wind vector retrieval
                                                                                                                                                                                                                                 4 lines of sight are sequentially scanned to perform geometrical computation of
                                                                                                                                                                                                                                 3D wind vector components (horizontal and vertical wind speeds, and direction).
      160m met mast is several hundred
                                                                                                                                                                                                                                 Retrieved wind field corresponds to an average of ~25m thick atmosphere layer
     meters away from the WindCube and
         comparison is just indicative
                                          160m                                                                                                                                                                                                      centered on up to 10 user defined altitudes.
                                                                                                                                                                                                                                    Classical scanning cone angle is 30°and can be rapidly reduced to 15°for
                                                                                                                                                                                                                                                    accurate wind profiling in complex terrain.

                                                                                                                                   10min average Lidar horizontal wind direction
                                                                                                                                      compared with CEA-Saclay (FRANCE)
                                                                                                                                     USA-1 sonic anemometer at 60m & 100m.
                                                                                                                             LEOSPHERE thanks CEA for WindcubeTM evaluation campaign performed in January-February 2007.

                                                                                                                                                            Horizontal wind speed standard
                                                                                                                                                                          deviation at 116m


                                                                                                                                              L_Usd115m=0.928 Cup_sd116m+0.043

                                                                                                                                                                                                                                         WindCubeTM can operate under any weather conditions
                                                                                                                                                                                                                                    Theoretical lidar range exceeds 150m in most common visibility conditions.

                                                                                                                                                                                                                                   LEOSPHERE will offer a range increase by upgrading laser source power to
                                          100m                                                                                                                                                                                    100µJ in the near future. Prototype has been successfully experienced during
                                                                                                                                                                                                                                              Frankfurt CREDOS campaign performed by ONERA.
                                                                                                                                                                                                                                  Increasing pulse length can also increase measurement range: a 120m range
                                                                                                                                                                                                                                        gate would lead to a 500m max altitude with a 10 µJ pulse energy.

                                                                                                                                  Vertical wind speed standard deviation at 100m
                                                                                                                                                                                                                                                    Benefit from EZ Software !

                                                                                                                                                                                                                                                               Real-Time data and
                                                                                                                                                                                                                                                              statistics for selected
                                          80m                                                                                                                                                                                                                         altitude
                                                                                                                                                                         March data
                                                                                                                                     altitude (m)                      availability (1Hz
                                                                                                                                                                           data, %)
                                                                                                                                              60                                    99.1
                                                                                                                                             100                                    98.2
                                                                                                                                             150                                    95.9
                                                                                                                                             200                                    87.7

                                                                                                                        Windcubetm data availability over March at RISØ
                                                                                                                                Høvsøre test site (Denmark)

                                          60m                                                                          Site weather statistics:
                                                                                                                       - T°min : 0°  C       - T°max : 16°C
                                                                                                                       - precipitation 50mm
                                                                                                                       - wind speed between 1 and 30 m/s

                                                                                                                       more test site weather statistics available at:

                                                                                                                                                                                                                                                                                                             CNR vs. range

                                                                                                                                                                                                                                       Real-Time horizontal
                                                                                                                                                                                                                                        wind speed profile                     Real-Time wind
                                                                                                                                                                                                                                                                               direction profile
                                                                          676 data points acquired over March 2007
                                                                               at Høvsøre test site (Denmark)
                                                                               dry weather data, wind direction
                                                                         between 240° -300°and 70°  -110°(free sector)                                                                                                     This work was partly funded by ADEME.

                                                                                   wind speeds above 4m/s                                                                                                                  LEOSPHERE is very grateful to Laboratoire de Surveillance de l’Environnement at CEA-Saclay for providing
                                                                                                                                                                                                                           met mast data at 60m and 100m.

                                                                                                                                                                                                                           LEOSPHERE acknowledges people at RISØ for their help and availability during validation campaign; special
                                                                                                                                                                                                                           thanks to Bjarne Soenderskov and Peter Lind.

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