Author: M. W. FitzmauricePublisher:
ISBN:
Category : Atmospheric radiation
Languages : en
Pages : 20
Book Description
Laser beam scintillation and log-amplitude variance evaluation for wavelengths on digital computer.
Wavelength Dependence of Laser Beam Scintillation
Author: M. W. FitzmauricePublisher:
ISBN:
Category : Atmospheric radiation
Languages : en
Pages : 20
Book Description
Laser beam scintillation and log-amplitude variance evaluation for wavelengths on digital computer.
Laser Beam Scintillation with Applications
Author: Larry C. AndrewsPublisher: SPIE Press
ISBN: 9780819441034
Category : Science
Languages : en
Pages : 408
Book Description
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.
Laser Beam Propagation Through Random Media
Author: Larry C. AndrewsPublisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Science
Languages : en
Pages : 820
Book Description
Since publication of the first edition of this text in 1998, there have been several new, important developments in the theory of beam wave propagation through a random medium, which have been incorporated into this second edition. Also new to this edition are models for the scintillation index under moderate-to-strong irradiance fluctuations; models for aperture averaging based on ABCD ray matrices; beam wander and its effects on scintillation; theory of partial coherence of the source; models of rough targets for ladar applications; phase fluctuations; analysis of other beam shapes; plus expanded analysis of free-space optical communication systems and imaging systems.
Electromagnetic Scintillation: Volume 2, Weak Scattering
Author: Albert D. WheelonPublisher: Cambridge University Press
ISBN: 113943960X
Category : Science
Languages : en
Pages : 462
Book Description
The first volume of this set of books on electromagnetic scintillation dealt with phase and angle-of-arrival measurement errors, which are accurately described by geometrical optics. This second volume concentrates on amplitude and intensity fluctuations of the received signal.
Collected Reprints
Author: Collected Reprints, 1970-1971
Author: Wave Propagation LaboratoryPublisher:
ISBN:
Category : Atmosphere
Languages : en
Pages : 538
Book Description
Measurements of 0.63mm Laser-beam Scintillation in Strong Atmospheric Turbulence
Author: G. R. OchsPublisher:
ISBN:
Category : Laser beams
Languages : en
Pages : 28
Book Description
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.
NASA Technical Report
Author: Experimental Investigations of Optical Propagation in Atmospheric Turbulence
Author: Michael W. FitzmauricePublisher:
ISBN:
Category : Atmospheric chemistry
Languages : en
Pages : 196
Book Description
The pertinent theoretical background and the results of a group of experiments conducted over 0.4- and 1.17-km near-ground horizontal ranges are presented. (1) The log-amplitude variances for HeNe (0.633 μm) and CO2 (10.6 μm) laser beams were found to have a ratio of 26.8, which is in close agreement with the predictions of Rytov-based spherical-wave theory. (2) Published measurements of the saturation level of the log-amplitude variance are reviewed and several inconsistencies noted. (3) The spatial correlation function of irradiance field was measured and found to agree with theory. The degree of correlation between different frequency beams which had traversed the same optical path was also measured and compared to theory. The data exhibited an unacceptably large scatter and did not show the wavelength dependence. (4) The log-normal, Rayleigh, and Rice probability distributions are discussed in terms of their applicability to irradiance statistics. Relatively weak 10.6 μm irradiance fluctuations were found to be equally well described by the log-normal and Rice distributions; strong fluctuations obtained at 0.488 μm were clearly best described by the log-normal distribution.
Laser Beam Scintillation with Applications
Author: Cynthia Y. YoungPublisher:
ISBN: 9781510604896
Category :
Languages : en
Pages : 416
Book Description
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.