Related Experiment Video
Updated: Jun 22, 2026

10:53
Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
Published on: March 12, 2019
Coherent return turbulent fluctuations in ground lidar systems profiling along slant paths
Optics Express
|June 9, 2009
Summary
This study estimates uncertainty in optical power measurements for ground-based heterodyne lidar systems. The research accounts for atmospheric turbulence and realistic conditions, improving lidar atmospheric profiling accuracy.
Area of Science:
- Atmospheric Optics
- Remote Sensing
- Optical Engineering
Background:
- Heterodyne lidar systems are crucial for atmospheric profiling.
- Atmospheric turbulence introduces significant uncertainty in optical power measurements.
- Accurate power measurement is essential for reliable lidar data.
Purpose of the Study:
- To simulate beam propagation for optical power measurement in heterodyne lidar.
- To estimate inherent statistical uncertainty from coherent return fluctuations.
- To account for realistic, non-uniform atmospheric conditions in lidar analysis.
Main Methods:
- Utilizing beam propagation simulations.
- Analyzing coherent return fluctuations.
- Developing an approach for non-uniform atmospheric conditions.
Main Results:
- Quantified statistical uncertainty in optical power measurements.
- Validated the impact of atmospheric turbulence on lidar signals.
- Demonstrated a method applicable to practical instrument configurations.
Conclusions:
- The developed approach enhances the accuracy of atmospheric profiling with ground-based lidar.
- Realistic atmospheric conditions can be effectively incorporated into lidar simulations.
- This work provides a foundation for more robust lidar data interpretation.
Related Concept Videos
Boundary 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...
Laminar and Turbulent Flow
Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the streamlines...
Influence of Earth's Curvature and Atmospheric Refraction on Leveling
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
Methods of Obtaining Topography
Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
Differential Leveling
Differential leveling is a precise method in surveying used to determine the elevation difference between two points. Its primary goal is to establish accurate vertical measurements to create level surfaces or grade lines critical for designing and constructing infrastructures such as roads, bridges, and buildings.The procedure for differential leveling begins with setting up and leveling the instrument at a point where the benchmark can be seen. The level rod is held on the benchmark (BM), and...
Turbulent Flow
Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent spots,...

