NDLI: Visibility related to backscatter at 1.54 micron

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Visibility related to backscatter at 1.54 micron

Content Provider	NASA Technical Reports Server (NTRS)
Author	Larson, D. R. Barber, T. L.
Copyright Year	1986
Description	The lidar process was shown to have the necessary potential to fulfill the need for a remote measurement of visibility. Visibility can be inferred from a lidar return optical extinction. The wavelength 1.54 micron was chosen, being near the visible wavelength region and having a high eye safety threshol, 200,000 times higher than 1.06 micron; 1.54 is the erbium laser wavelength. This research utilized 105 measured height profiles of natural droplet size distributions data, taken in clouds, fog, and haze. These profiles were examined to determine the completeness of the droplet counting data. It was found that the particle spectrometer data were incomplete in the very light ford and haze so this portion of the data was eliminated. Utilizing the Mie theory, these droplet size distribution profiles were converted to backscatter at 1.54 micron and extinction in the visible region, 0.55 micron. Using Koschmeider's relationship, the extinction profiles were converted to visibility. The visibility and backscatter profiles were compared to develop a relationship between visibility and backscatter at 1.54 micron.
File Size	50924
Page Count	2
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19870000839
Archival Resource Key	ark:/13960/t1mh2h501
Language	English
Publisher Date	1986-08-01
Access Restriction	Open
Subject Keyword	Environment Pollution Size Distribution Wavelengths Lasers Backscattering Haze Spectrometers Clouds Meteorology Visibility Optical Radar Drops Liquids Fog Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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