Accession Number:

AD0903327

Title:

Airborne Laser Beam Propagation Measurements of High-Altitude Atmospheric Turbulence.

Descriptive Note:

Technical rept. Jan-May 72,

Corporate Author:

EG AND G INC ALBUQUERQUE NM

Personal Author(s):

Report Date:

1972-08-01

Pagination or Media Count:

62.0

Abstract:

Two NC-135 jet aircraft were used in an airborne laser beam scintillation experiment in order to measure high-altitude values of the index of refraction structure. Measurements were made for transmitter-receiver spacings of 0.5, 1.5, 2.0, and 3.0 km. Altitude values ranged from 1.5 km to 10.5 km in approximately 1.5 km increments. Measurements were made at optical wavelengths of 0.6328 micrometers and 10.6 micrometers. Computed scintillation parameters include log-intensity variance, probability distribution function, cumulative probability, and temporal power spectral density. Measured values of index of refraction structure were consistently higher than expected at high altitudes. Some contributions to the measured values of index of refraction structure may have come from boundary layer turbulence near the transmitting aircraft. However, this contribution is small. On the average, the upper atmosphere is much more turbulent than current models predict it to be.

Subject Categories:

  • Atmospheric Physics
  • Lasers and Masers
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE