Search results
Results From The WOW.Com Content Network
The polarization is characterized at each wavelength by its degree of polarization, and orientation (the e-vector angle, or scattering angle). The polarization pattern of the sky is dependent on the celestial position of the Sun. While all scattered light is polarized to some extent, light is highly polarized at a scattering angle of 90° from ...
Rayleigh scattering of that light off oxygen and nitrogen molecules, and; the response of the human visual system. The strong wavelength dependence of the Rayleigh scattering (~λ −4) means that shorter wavelengths are scattered more strongly than longer wavelengths. This results in the indirect blue and violet light coming from all regions ...
On a sunny day, Rayleigh scattering gives the sky a blue gradient, darkest around the zenith and brightest near the horizon. Light rays coming from the zenith take the shortest-possible path (1 ⁄ 38) through the air mass, yielding less scattering. Light rays coming from the horizon take the longest-possible path through the air, yielding more ...
Both Mie and Rayleigh scattering are considered elastic scattering processes, in which the energy (and thus wavelength and frequency) of the light is not substantially changed. However, electromagnetic radiation scattered by moving scattering centers does undergo a Doppler shift , which can be detected and used to measure the velocity of the ...
Lord Rayleigh recognized the zero-angle scattering amplitude in terms of the index of refraction as n = 1 + 2 π N f ( 0 ) k 2 {\displaystyle n=1+2\pi {\frac {Nf(0)}{k^{2}}}} (where N is the number density of scatterers), which he used in a study of the color and polarization of the sky.
SI prefixes are used with the rayleigh. One rayleigh (1 R) is defined as a column emission rate of 10 10 photons per square metre per column per second. A column is one centimeter cross-section [clarify]. [3] The rayleigh is a unit of an apparent emission rate, without allowances being made for scattering or absorption.
Thus, speckle and resonant Rayleigh-scattering are always superimposed to the incoherent emission. In case of the non-resonant excitation, the structure is excited with some excess energy. This is the typical situation used in most PL experiments as the excitation energy can be discriminated using a spectrometer or an optical filter. One has to ...
The dominant radiative scattering processes in the atmosphere are Rayleigh scattering and Mie scattering; they are elastic, meaning that a photon of light can be deviated from its path without being absorbed and without changing wavelength. Under an overcast sky, there is no direct sunlight, and all light results from diffused skylight radiation.