scattering


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scattering

1. the random deflections suffered by light or other electromagnetic radiation passing through an irregular medium. If the source, medium, or observer are in relative motion, scintillations – random fluctuations of amplitude – may be seen as the source is observed through the medium: scattering in the Earth's atmosphere causes the stars to twinkle. Scintillations may only be seen if both the angular size of the source and the bandwidth in which the waves are received are small enough. Otherwise, the effect of the scattering may simply be to broaden the apparent angular size of the source.

Scintillations of radio waves are observed to occur because of irregularities in the refractive index of the ionosphere, the interplanetary medium, and the interstellar medium giving ionospheric scintillation, interplanetary scintillation (IPS), and interstellar scintillation (ISS), respectively. IPS may be used in determining the angular sizes of radio sources at meter wavelengths in the range 0.1 to 2 arc seconds, or for measuring parameters of the solar wind. ISS cause some of the random fluctuations in the intensity of pulses received from pulsars.

Light may be deflected from its direction of travel by fine particles of solid, gaseous, or liquid matter. For very small particles (less than one wavelength in size) the effect results from diffraction, reflection playing a more important part with increasing size; this is known as Rayleigh scattering and is very dependent on wavelength. Very small particles scatter blue light more strongly than red light. This leads to the reddening of starlight by cosmic dust and to the reddening of the Sun when seen through a thick layer of atmospheric dust.

2. the deflection of individual particles (such as electrons or photons) from their direction of travel as a result of their interaction with other particles, nuclei, atoms, or molecules in the medium through which they are passing. There are various scattering processes including Compton scattering.

scattering

[′skad·ə·riŋ]
(electromagnetism)
Diffusion of electromagnetic waves in a random manner by air masses in the upper atmosphere, permitting long-range reception, as in scatter propagation. Also known as radio scattering.
(physics)
The change in direction of a particle or photon because of a collision with another particle or a system.
Diffusion of acoustic or electromagnetic waves caused by inhomogeneity or anisotropy of the transmitting medium.
In general, causing a collection of entities to assume a less orderly arrangement.
References in periodicals archive ?
Nonetheless, this explanation is purely empirical as per our knowledge; existing effective medium theoretical frameworks cannot be applied to such highly scattering systems, whose particle size is of the order of magnitude of the wavelength of the incident radiation.
In the academic sphere, fundamental analyses of HPP optical properties are mostly realized within the approximation of an independent light scattering regime.
Static Light Scattering (SLS) is widely used to determine the exact physical size or molecular weight of a molecule without the need for external calibration.
Scattering centers on streamlined surface have the tendency of sliding with the change of observation directions by radar, which is not considered in the existing scattering models.
To tackle this problem, the features of scattering centers on streamlined target are investigated based on a thorough analysis of scattering characteristics.
9] proposed a classification method for preserving scattering characteristics, which divides pixels into three basic scattering categories, i.
When families and friends live nearby, scattering of ashes is generally a private memorial attended by loved ones of the deceased.
2] light scattering efficiency as the TiO2 content and average refractive index of the coating increase as predicted by Mie Theory.
It is now well established that an increasing pigment-filling fraction gives rise to "dependent" light scattering as a fundamental phenomenon leading to a gradual loss in the scattering efficiency.
Small-angle x-ray scattering (SAXS) is a widely used variation of this technique that fires a monochromatic beam through a sample.
Key words: absorbance: integrating sphere detector; microalgae; scattering.
3 : to cover by or as if by scattering something <Drivers strewed the highway with litter.