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| Author | : G. R. Ochs |
| Publisher | : |
| Total Pages | : 17 |
| Release | : 1969 |
| Genre | : |
| ISBN | : |
| Author | : G. R. Ochs |
| Publisher | : |
| Total Pages | : 28 |
| Release | : 1969 |
| Genre | : Laser beams |
| ISBN | : |
Log-amplitude variance and covariance of the scintillation of a diverging optical beam have been measured over a 48-hr period at a wavelength of 0.63[mu], on a 490 and 1000 m optical paths 2 m above the surface of a flat mesa near Boulder, Colorado. Simultaneous measurements of the refractive-index structure of the atmosphere have been obtained from temperature-structure-function measurements at spacings of 1, 3, and 10 cm. A saturation of scintillation occurs for values of log-amplitude variance between 0.5 and 1. After reaching a peak, the log-amplitude variance then decreases with both increasing range and increasing refractive-index turbulence. The spatial covariance of the fluctuations tends to increase in the saturation region. In the unsaturated region, the log-amplitude variance is approximately that predicted by the spherical-wave propagation theory of Tatarski.
| Author | : Wave Propagation Laboratory |
| Publisher | : |
| Total Pages | : 17 |
| Release | : 1969 |
| Genre | : |
| ISBN | : |
| Author | : G. R. Ochs |
| Publisher | : |
| Total Pages | : 17 |
| Release | : 1969 |
| Genre | : Laser beams |
| ISBN | : |
| Author | : G. R. Ochs |
| Publisher | : |
| Total Pages | : 17 |
| Release | : 1969 |
| Genre | : Laser beams |
| ISBN | : |
| Author | : G. R. Ochs |
| Publisher | : |
| Total Pages | : 17 |
| Release | : 1969 |
| Genre | : |
| ISBN | : |
| Author | : Larry C. Andrews |
| Publisher | : SPIE Press |
| Total Pages | : 408 |
| Release | : 2001 |
| Genre | : Science |
| ISBN | : 9780819441034 |
Renewed interest in laser communication systems has sparked development of useful new analytic models. This book discusses optical scintillation and its impact on system performance in free-space optical communication and laser radar applications, with a detailed look at propagation phenomena and the role of scintillation on system behavior. Intended for practicing engineers, scientists, and students.
| Author | : Glen J. Morris |
| Publisher | : |
| Total Pages | : 62 |
| Release | : 1972 |
| Genre | : |
| ISBN | : |
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.
| Author | : J. W. Strohbehn |
| Publisher | : |
| Total Pages | : 426 |
| Release | : 1978 |
| Genre | : Atmosphere |
| ISBN | : |
| Author | : Hugo Weichel |
| Publisher | : SPIE-International Society for Optical Engineering |
| Total Pages | : 118 |
| Release | : 1990 |
| Genre | : Science |
| ISBN | : |
