ALADIN: an atmosphere laser Doppler wind lidar instrument for wind velocity measurements from space

1995 ◽  
Author(s):  
Rodolphe Krawczyk ◽  
Jean-Bernard Ghibaudo ◽  
Jean-Yves Labandibar ◽  
David V. Willetts ◽  
M. Vaughan ◽  
...  
Keyword(s):  
Wind Velocity ◽  
Laser Doppler ◽  
Velocity Measurements ◽  
Wind Lidar ◽  
Doppler Wind Lidar

ALADIN: an atmospheric laser Doppler wind lidar instrument for wind velocity measurements from space

1996 ◽  
Author(s):  
Rodolphe Krawczyk ◽  
Jean-Bernard Ghibaudo ◽  
Jean-Yves Labandibar ◽  
David V. Willetts ◽  
M. Vaughan ◽  
...  
Keyword(s):  
Wind Velocity ◽  
Laser Doppler ◽  
Velocity Measurements ◽  
Wind Lidar ◽  
Doppler Wind Lidar

Intercomparison of Doppler Wind Lidar Velocity Measurements

2003 ◽  
Author(s):  
M.K. Rama Varma Raja ◽  
James G. Yoe ◽  
R. Michael Hardesty ◽  
W. Allen Brewer ◽  
Berrien Moore ◽  
...  
Keyword(s):  
Velocity Measurements ◽  
Wind Lidar ◽  
Doppler Wind Lidar

scholarly journals Performance and Technique of Coherent 2-μm Differential Absorption and Wind Lidar for Wind Measurement

2013 ◽  
Vol 30 (3) ◽  
pp. 429-449 ◽  
Author(s):  
Hironori Iwai ◽  
Shoken Ishii ◽  
Ryoko Oda ◽  
Kohei Mizutani ◽  
Shinya Sekizawa ◽  
...  
Keyword(s):  
Wind Velocity ◽  
Signal To Noise Ratio ◽  
Sonic Anemometer ◽  
Correlation Coefficients ◽  
Co2 Concentration ◽  
Horizontal Wind ◽  
Doppler Lidar ◽  
Differential Absorption ◽  
Velocity Measurements ◽  
Wind Lidar

Abstract A coherent 2-μm differential absorption and wind lidar (Co2DiaWiL) has been built with a high-power Q-switched Tm,Hm:YLF laser to measure CO2 concentration and radial wind speed. The performance of the Co2DiaWiL is described and analyzed, with a view to demonstrating system capabilities for remote measurements of wind velocities in the atmospheric boundary layer and free troposphere. Bias in the velocity measurements was estimated at −0.0069 m s−1 using measurements from a stationary hard target. The Co2DiaWiL achieved a velocity precision of 0.12 m s−1, derived from the magnitude of random error in radial wind velocity measurements. These measurements were made for ranges out to 20–25 km by using a horizontally fixed beam mode for average times of 1 min. Quantitative intercomparisons of 1-min averages between the Co2DiaWiL and a sonic anemometer revealed a correlation coefficient of 0.99. This study demonstrated measurements of horizontal wind profiles, by making radial wind velocity measurements with the Co2DiaWiL using conical scanning. Profile differences at higher levels could be attributed to probable large horizontal separations of the radiosondes and the low signal-to-noise ratio of the Co2DiaWiL. A pseudo-dual-Doppler technique was developed to retrieve horizontal wind components with a single-Doppler lidar and a steering mirror. Intercomparisons of the 1-min-averaged u and υ components from the pseudo-dual-Doppler lidar measurements with those from the sonic anemometer revealed correlation coefficients of 0.84 and 0.83, respectively.

Spaceborne CO2 laser doppler wind lidar ALADIN: mission and instrument concept

1995 ◽  
Author(s):  
Ulrich A. Johann ◽  
Rainer Treichel ◽  
Frederic Safa ◽  
Paul M. Schwarzenberger
Keyword(s):  
Laser Doppler ◽  
Wind Lidar ◽  
Doppler Wind Lidar

scholarly journals High-resolution Bistatic Wind Lidar

2021 ◽  
Author(s):  
Paul Wilhelm ◽  
Michael Eggert ◽  
Julia Hornig ◽  
Stefan Oertel
Keyword(s):  
High Resolution ◽  
Measurement Uncertainty ◽  
Wind Velocity ◽  
Coherent Detection ◽  
Velocity Measurements ◽  
Measurement Volume ◽  
Optical Transmitter ◽  
Large Measurement ◽  
Inhomogeneous Flow ◽  
Wind Lidar

The high-resolution bistatic lidar developed at the Physikalisch-Technische Bundesanstalt (PTB) aims to overcome the limitations of conventional monostatic lidar technology which is widely used for wind velocity measurements in wind energy and meteorology applications. Due to the large measurement volume of a combined optical transmitter and receiver tilting in multiple directions, monostatic lidar generally has poor spatial and temporal resolution. It also exhibits large measurement uncertainty when operated in inhomogeneous flow, for instance, over complex terrain. In contrast, PTB’s bistatic lidar uses three dedicated receivers arranged around a central transmitter, resulting in an exceptionally small measurement volume. The coherent detection and modulation schemes used allow the detection of backscattered, Doppler shifted light down to the scale of single aerosols, realising the simultaneous measurement of all three wind velocity components. This paper outlines design details and the theory of operation of PTB’s bistatic lidar and provides an overview of selected comparative measurements. The results of these measurements have shown that the measurement uncertainty of PTB’s bistatic lidar is well within the measurement uncertainty of traditional cup anemometers, while being fully independent of its site and traceable to the SI units. This allows its use as a transfer standard for the calibration of other remote sensing devices. Overall, PTB’s bistatic lidar shows great potential to universally improve the capability and accuracy of wind velocity measurements, such as for the investigation of highly dynamic flow processes upstream and in the wake of wind turbines.

scholarly journals High Spatial and Temporal Resolution Bistatic Wind Lidar

2021 ◽  
Vol 11 (16) ◽  
pp. 7602
Author(s):  
Paul Wilhelm ◽  
Michael Eggert ◽  
Julia Hornig ◽  
Stefan Oertel
Keyword(s):  
Measurement Uncertainty ◽  
Wind Velocity ◽  
Temporal Resolution ◽  
Coherent Detection ◽  
Velocity Measurements ◽  
Measurement Volume ◽  
Optical Transmitter ◽  
Large Measurement ◽  
Inhomogeneous Flow ◽  
Wind Lidar

The high-resolution bistatic lidar developed at the Physikalisch-Technische Bundesanstalt (PTB) aims to overcome the limitations of conventional monostatic lidar technology, which is widely used for wind velocity measurements in wind energy and meteorology applications. Due to the large measurement volume of a combined optical transmitter and receiver tilting in multiple directions, monostatic lidar generally has poor spatial and temporal resolution. It also exhibits large measurement uncertainty when operated in inhomogeneous flow; for instance, over complex terrain. In contrast, PTB’s bistatic lidar uses three dedicated receivers arranged around a central transmitter, resulting in an exceptionally small measurement volume. The coherent detection and modulation schemes used allow the detection of backscattered, Doppler shifted light down to the scale of single aerosols, realising the simultaneous measurement of all three wind velocity components. This paper outlines the design details and theory of operation of PTB’s bistatic lidar and provides an overview of selected comparative measurements. The results of these measurements show that the measurement uncertainty of PTB’s bistatic lidar is well within the measurement uncertainty of traditional cup anemometers while being fully independent of its site and traceable to the SI units. This allows its use as a transfer standard for the calibration of other remote sensing devices. Overall, PTB’s bistatic lidar shows great potential to improve the capability and accuracy of wind velocity measurements, such as for the investigation of highly dynamic flow processes upstream and in the wake of wind turbines.

Sign in / Sign up

Export Citation Format

Share Document