United States Department of Transportation
i
Concept Discussion for Laser Detection of Local Atmospheric Particle Motion Generated by Turbulence
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1999-04-08
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[PDF-2.74 MB]
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NTL Classification:NTL-AVIATION-Air Traffic Control;NTL-AVIATION-Airports and Facilities;NTL-AVIATION-AVIATION;NTL-AVIATION-Aviation Safety/Airworthiness;
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Abstract:Lidar systems have been applied to remotely detect wind velocities since 1966. Lidar illuminates particles in the atmosphere with a laser and monitors the light backscattered from the particles for a shift in wavelength from that of the laser. The observed wavelength shift, called a Doppler shift, is proportional to the relative velocity difference between the lidar unit and the particles. The assumption is made that the particles are light and are entrained in the flow field to be measured. Thus, the velocity of the air molecules can be determined through analysis of the Doppler shift. In Chapter 2 of this report, reviews the underlying physics and Doppler lidar technologies that are essential for analyzing any lidar-based system for detecting turbulence via its acoustic emanations. Chapter 3 discusses particle motion induced by turbulence generated acoustic waves and other atmospheric motion. The fundamentals of the most basic concept for detecting turbulence via its acoustic emanations, i.e., processing data from a single lidar beam intercepting an existing acoustic wave, are discussed in Chapter 4. Finally, Chapter 5 summarizes identified challenges confronting the development and application of a Doppler lidar system for the acoustic detection of turbulence.
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