Laser Scanner, a new 3D Doppler wind scanner
The Laser Scanner, newly introduced in 2021, is the state-of-the-art scanning Doppler lidar for a variety of applications.
While continuous wave (CW) lidars measure wind over distance sequentially by varying the focus of the laser beam, is a pulsed lidar. It uses short laser pulses to determine distances from the speed of light and therefore registers the complete wind profile with each measurement. Its data rate is more than ten times higher than CW lidar.
It can be installed on top of the nacelle of wind turbines for studying wind fields in front of the rotor or in its wake, as well as in the spinner. Ground-based installations permit detailed analyses of wind resource in the context of wind farm planning.
Its excellent insulation, with a housing made from 1.4571 and 1.4404 stainless steel and connectors from the maritime industry, makes the Laser Scanner ideal for offshore applications including installation on met masts and floating buoys.
Examples of scan patterns. Users may easily define scan patterns according to their needs.
- Laser, signal detection and processing, industrial PC and power supply in a single box
- Wind speed up to 85 m/s at 0.1 m/s resolution
- Profiling range from 60 to 550 m, depending on atmospheric visibility, with a full profile repetition rate between 0.1 and 1 s due to pulsed operation
- 3D wind data in range gates, each of 30 m length, in user-defined planes normal to the instrument axis
- Variable scan angles up to ±26.6° horizontally and vertically; user-selectable scan patterns in fly-by or point-to-point mode
- Wind data in csv/tdms format; wind and auxiliary data in HDF5 format according to the e-WindLidar standard
- Dimensions: 65 cm long, Ø 35 cm. Mass: 34 kg
- Input voltage: 24 (18...36) V DC.
- Power consumption: 75 W typ., 100 W max.
- Eye-safe laser operation
- Protection classification: IP68
Graphical User Interface, with (from top to bottom) spectrum from aerosol backscatter
at 550 m distance (range gate 37) with the Doppler peak from which wind speed is derived, and colour coded wind profiles showing strong atmospheric turbulence. Measuring points correspond to seconds.
Left: Laser Scanner
with a heat protective cover, for measurements
at Stuttgart Wind Energy, Germany. Right: Rear view of the instrument.
The Laser Scanner was developed under contract of Stuttgart Wind Energy (SWE), University of Stuttgart, Germany with financial support from the German Federal Ministry for Economic Affairs and Energy, Berlin, Germany.