Related Experiment Video
Updated: Jul 7, 2026
08:54
Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
Published on: February 13, 2018
Edge technique Doppler lidar wind measurements with high vertical resolution
Applied Optics
|August 20, 1997
Summary
This study presents a new Doppler lidar system for atmospheric wind measurements. The system accurately measures wind profiles, showing potential for studying atmospheric dynamics and turbulence.
Area of Science:
- Atmospheric Science
- Remote Sensing
- Meteorology
Background:
- Accurate atmospheric wind measurements are crucial for understanding weather patterns and climate dynamics.
- Traditional methods like rawinsondes have limitations in spatial and temporal resolution.
- Doppler lidar offers a promising remote sensing alternative for wind profiling.
Purpose of the Study:
- To develop and validate a Doppler lidar system utilizing the edge technique for atmospheric wind measurements.
- To assess the system's accuracy and performance in measuring wind speed and direction profiles.
- To demonstrate the lidar's capability in capturing wind shear and turbulent features.
Main Methods:
- Development of a Doppler lidar system employing the edge technique.
- Acquisition of line-of-sight wind profiles with 22 m vertical resolution.
- Validation of lidar data against rawinsonde and pilot balloon measurements.
- Analysis of instrumental noise and standard deviation for atmospheric measurements.
Main Results:
- Achieved a standard deviation of 0.40 m/s for ten-shot averages in wind profiles.
- Successfully conducted day and night measurements for altitudes ranging from 200 to 2000 m.
- Demonstrated good agreement between lidar-derived winds and independent measurement techniques.
- Observed wind shear and turbulent features at the 1-2 m/s level with high signal-to-noise ratio.
Conclusions:
- The developed edge-technique Doppler lidar system provides accurate and high-resolution atmospheric wind measurements.
- The system's performance is validated, showing low instrumental noise and good agreement with traditional methods.
- The lidar's capability to detect wind shear and turbulence highlights its potential for atmospheric dynamics research.
Related Concept Videos
01:18Boundary Layer Characteristics
When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
01:05Doppler Effect - II
The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
01:29Application of Linearization and Approximation
A drone flying through complex terrain often relies on more than one sensing method to estimate small changes in altitude. Along with direct measurements, air pressure provides a useful indirect indicator of vertical movement. Atmospheric pressure decreases as altitude increases, and this relationship is commonly described using an exponential model. Although accurate, converting pressure measurements into altitude values requires calculations that are too complex to perform repeatedly during...
00:56Doppler Effect - I
The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
01:03Precipitation Gravimetry
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...