Accession Number:

ADA626345

Title:

Investigation of Atmospheric Laser Optics Test bed (A_LOT) Optical Turbulence Intensity for Free-Space Laser Communications

Descriptive Note:

Final rept. Jul-Oct 2006

Corporate Author:

ARMY RESEARCH LAB ADELPHI MD COMPUTATIONAL AND INFORMATION SCIENCES DIRECTORATE

Report Date:

2006-12-01

Pagination or Media Count:

46.0

Abstract:

In this report, we examine optical turbulence intensity measured at the U.S. Army Research Laboratorys ARL Atmospheric Laser Optics Test bed ALOT. Our goal is to better understand the physics relationships between refractive index structure and micro-climatological moments since these can significantly affect free-space laser communications. Optical scintillometer data are collected over a nearly horizontal 2.33 km propagation path and compared with in situ rooftop measurements of temperature variance. Regression analysis of time-averaged data from these different sensor systems suggests that occasionally optical turbulence information for an extended propagation path can be derived via point sensors, which are less costly to install and easier to maintain than scintillometer-based methods. Nevertheless, a key factor to consider is the extent of homogeneity of the optical turbulence and micro-climatological conditions along the ALOT optical path. Additional research is recommended to further explore optical turbulence and microphysical influences on laser light propagation in complex areas.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Optics
  • Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE