Results 141 to 150 of about 932 (178)
Some of the next articles are maybe not open access.
Airborne Doppler lidar wind measurements
Conference Digest. 2000 Conference on Lasers and Electro-Optics Europe (Cat. No.00TH8505), 2000Summary form only given. Study of the atmospheric wind field is fundamental for the understanding and prediction of the weather development. To overcome the spatial limitations of ground based observations, airborne measurements are recognised as excellent tools to study atmospheric processes.
openaire +2 more sources
Doppler lidar for tropospheric wind measurements
SPIE Proceedings, 1992A ground-based Doppler wind lidar for tropospheric wind speed measurement is being developed for environmental applications such as pollutants distribution studies and climatology investigations preceding the choice of sites for power plants and factories. This paper gives a short overview on specifications and design concepts of the system and reports
Enrico Galletti +2 more
openaire +1 more source
Vertical wind velocity measurements by a Doppler lidar and comparisons with a Doppler sodar
Applied Optics, 1981A Doppler lidar based on a single frequency Ar(+) laser and a spherical Fabry-Perot interferometer is used to study the vertical velocity field in the planetary boundary layer. The wind velocity information is obtained by spectral analysis of the aerosol backscatter.
F, Congeduti +3 more
openaire +2 more sources
Dual-frequency Doppler-lidar method of wind measurement
Applied Optics, 1980In this new method [dual-frequency Doppler-lidar (DFDL)] of remote wind sensing, two optical beams of unlike frequency are superimposed in the sensed volume. The velocity information is obtained from the difference in the Doppler shifts of light scattered from the two beams by aerosols moving with the air.
W L, Eberhard, R M, Schotland
openaire +2 more sources
Wind Variability Measured by Doppler Lidar
Journal of Applied Meteorology, 1989Abstract Wind power spectral density measured in the lower and middle troposphere under zonal flow conditions is consistent with a −5/3 slope to frequencies as high as 10−2 Hz. By conversion of frequency to a spatial coordinate it is found that a satellite-borne lidar when averaging such winds over a 300 km grid scale would measure the synoptic-scale ...
openaire +1 more source
Coherent Doppler lidar signal spectrum with wind turbulence
Applied Optics, 1999The average signal spectrum (periodogram) for coherent Doppler lidar is calculated for a turbulent wind field. Simple approximations are compared with the exact calculation. The effects of random errors in the zero velocity reference, the effects of averaging spectral estimates by use of multiple lidar pulses, and the effects of the range dependence of
R, Frehlich, L, Cornman
openaire +2 more sources
Validation of wind profiles measured with incoherent Doppler lidar
Applied Optics, 1997A high-resolution incoherent Doppler lidar has been constructed at the University of Michigan Space Physics Research Laboratory. The primary purpose of this lidar is to measure vertical profiles of the horizontal wind field with high spatial and temporal resolution. In mid-1994 a rawinsonde system was used to assess the performance of the lidar.
M J, McGill, W R, Skinner, T D, Irgang
openaire +2 more sources
Simulation of wind profiles from a space-borne Doppler wind lidar
Quarterly Journal of the Royal Meteorological Society, 2003AbstractThe importance of wind observations for meteorological analysis has been recognized for many years. The current global observing system lacks a uniform distribution of tropospheric wind measurements, especially in the tropics and southern hemisphere, and over the northern‐hemisphere oceans.
G. J. Marseille, A. Stoffelen
openaire +1 more source
Wind measurement accuracy of the NOAA pulsed infrared Doppler lidar
Applied Optics, 1983We have measured wind fields from the atmospheric boundary layer to the lower stratosphere using the NOAA pulsed, infrared (CO2) Doppler lidar and compared the results with measurements by sonic anemometers on a 300 m tower, by rawinsondes, by Jimspheres, and by a radar wind profiler.
F F, Hall +7 more
openaire +2 more sources
Intercomparison of Doppler Wind Lidar Velocity Measurements
Optical Remote Sensing, 2003Three collocated Doppler Wind Lidars (DWLs) were used to measure winds during a demonstration campaign in New Hampshire September 2000. Corresponding line-of-sight (LOS) velocities determined by pairs of DWLs realized good agreement under clear sky conditions with random differences that increase as a function of decreasing signal strength.
M.K. Rama Varma Raja +10 more
openaire +1 more source