Scattering of Electromagnetic Waves by Turbulent, Weakly Ionized Plasmas

1968 ◽  
Vol 23 (1) ◽  
pp. 19-25
Author(s):  
W. Kröll
Keyword(s):  
Dielectric Constant ◽  
Statistical Theory ◽  
Electromagnetic Wave ◽  
Spectral Density ◽  
Cross Section ◽  
Electromagnetic Waves ◽  
Structure Functions ◽  
Weakly Ionized ◽  
Weakly Ionized Plasma ◽  
Monochromatic Electromagnetic Wave

The scattering of a plane, monochromatic electromagnetic wave by the fluctuations of the dielectric constant of a turbulent weakly, ionized plasma is investigated on the basis of the statistical theory of locally isotropic tubulence. The effects of collisions on the fluctuating dielectric constant of the electrons are taken into account. The spectral density determining the scattering cross section is related to the structure functions of the fluctuations of the electron concentration and the temperature. These structure functions are calculated from the transport equations with the use of methods developed in the statistical theory of strong turbulence.

Electromagnetic wave propagation in a chiroplasma-filled waveguide

1999 ◽  
Vol 62 (1) ◽  
pp. 87-94 ◽  
Author(s):  
J. GONG
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Cross Section ◽  
Electromagnetic Waves ◽  
Electromagnetic Wave Propagation ◽  
Propagation Constant ◽  
Circular Cross Section ◽  
Propagation Characteristics ◽  
Waveguide Modes ◽  
The Family

A dispersion equation is derived for a cylindrical waveguide of circular cross-section partially filled with chiroplasma. The propagation characteristics of electromagnetic waves in the family of waveguide modes are studied. The dispersion curves are given. It is found that the propagation constant changes almost linearly with the chirality admittance for the parameters that we choose, and increases with increasing filled area.

scholarly journals Influence of variability of water content in different states on electromagnetic waves parameters affecting accuracy of GPR measurements of asphalt and concrete pavements

2019 ◽  
Vol 262 ◽  
pp. 06012
Author(s):  
Małgorzata Wutke ◽  
Anna Lejzerowicz ◽  
Wioletta Jackiewicz-Rek ◽  
Andrzej Garbacz
Keyword(s):  
Dielectric Constant ◽  
Electromagnetic Wave ◽  
Water Content ◽  
Electromagnetic Waves ◽  
Atmospheric Precipitation ◽  
Propagation Speed ◽  
Asphalt Pavements ◽  
Concrete Pavements ◽  
Moisture Conditions ◽  
Accuracy And Repeatability

In the paper a water content effect in various states on the variability of the electromagnetic waves parameters is discussed. This variation can affect accuracy and repeatability of asphalt and concrete pavement thickness estimation with GPR method. In case of asphalt pavements, tests were carried out using the air-coupled 1.0 GHz antenna and included three approaches: two on asphalt road and one of asphalt slabs. In the case of concrete slabs, tests were carried out using a ground-coupled 1.6 GHz antenna on two slabs: reinforced and unreinforced. A high variability of the electromagnetic wave parameters was observed depending on moisture conditions. The increase in the humidity of the medium causes a reduction in the propagation speed of the electromagnetic wave (increasing the dielectric constant of the medium), increasing of waves time propagation, decreasing of reflection amplitude and increasing of frequency attenuation, which should be considered when determining the thicknesses of the construction layers. Studies showed that not always higher air humidity, atmospheric precipitation and consequently wet surface indicate a higher dielectric constant of the medium. It can be concluded that not only the humidity and ambient temperature affect the change in the dielectric constant, but also other factors not resulting from the construction of the pavement as well as material microstructure.

Kinetic approach to the propagation of electromagnetic waves in a weakly ionized plasma

1982 ◽  
Vol 1 (5) ◽  
pp. 673-687 ◽  
Author(s):  
V. C. Boffi ◽  
V. G. Molinari ◽  
R. Scardovelli
Keyword(s):  
Electromagnetic Waves ◽  
Kinetic Approach ◽  
Weakly Ionized ◽  
Weakly Ionized Plasma

On linearly polarized electromagnetic waves of arbitrary form

1954 ◽  
Vol 50 (4) ◽  
pp. 614-622 ◽  
Author(s):  
A. Nisbet ◽  
E. Wolf
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Arbitrary Form ◽  
General Properties ◽  
Linearly Polarized ◽  
Fermat’S Principle ◽  
Monochromatic Electromagnetic Wave ◽  
Fermat's Principle ◽  
Phase Functions

ABSTRACTTwo simple laws connecting the amplitude and phase functions of a monochromatic electromagnetic wave of arbitrary form are derived, holding in the case when one of the field vectors is linearly polarized. The first is a generalized Fermat's principle which enables determination of the phase when the amplitude is known; the second expresses the propagation of the (vector) amplitude along the curves orthogonal to the co-phasal surfaces. Some other general properties of linearly polarized fields are also discussed, and illustrative examples are given.

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