refractivity


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re·frac·tiv·i·ty

(rē'frak-tiv'i-tē),
Refractive power.
Synonym(s): refringency

re·frac·tiv·i·ty

(rē'frak-tiv'i-tē)
Refractive power.

refractivity

(rē″frăk-tĭv′ĭ-tē)
The quality of being refractive; the ability to refract.

dispersion

Phenomenon of the change in velocity of propagation of radiation in a medium, as a function of its frequency, which causes a separation of the monochromatic components of a complex radiation. All optical media cause dispersion by virtue of their variation of refractive index with wavelengths. Dispersion is specified by the difference in the refractive index of the medium for two wavelengths. The difference between the blue F (486.1 nm) and the red C (656.3 nm) spectral lines is called the mean dispersion, i.e. nFnC. Dispersion is usually represented by its dispersive power ω or relative dispersion which is equal to the mean dispersion divided by the excess refractive index of the helium d (587.6 nm) spectral line (nd − 1), often called the refractivity of the material,
ω = nFnC/nd − 1
The reciprocal of the dispersive power is called the Abbé's number or constringence (Fig. D8). See aberration longitudinal chromatic; achromatic axis; Fraunhoffer's lines; achromatic prism.
Fig. D8 Dispersion of a white beam of light by a prismenlarge picture
Fig. D8 Dispersion of a white beam of light by a prism
References in periodicals archive ?
Using the radar clutter to estimate the atmospheric refractivity profile, the objective is not to obtain an accurate profile, but to get one profile that can well describe the basic information of the atmospheric refractivity environment.
Moreover, the wet refractivity field maps from the tomography can be applied in the compensation of atmospheric features present on several remote sensing data such as InSAR or MODIS sensor images.
The k-factor is a function of the vertical refractivity gradient, dN/dh, and can also be determined from [13,15,18]:
Getting candidate refractivity profiles with the parameters of the EDH and the slope in the mixed layer.
The average daily temperature T in different time of day, relative humidity H, radio refractivity N, radio refractivity gradient [G.
6,9) Aquatic birds may be phylogenetically adapted to the organism, which is widespread in their natural environment, as reflected by the greater isolation rate in birds from aquatic habitats, (6) and they may be able to tolerate the organism, as reflected by refractivity of ducklings to artificial infection in contrast to chicks and turkey poults.
The theoretical models predict transmission losses by mathematical analysis of the path geometry of the terrain between the transmitter and the receiver and the refractivity of the troposphere [3].
The atmospheric duct environment is usually described by the atmospheric modified refractivity profile.
u] are the molar volume and molar refractivity, respectively, of PIs, expressed by the following equations:
Changes in volume in mixing and refractivity are not considered.
2007; Barosum, 2001), the metallic properties, such as electrical and thermal conductivity and thermal shock resistance, are combined with ceramics properties, such as good oxidation resistance, a refractivity and high decomposition temperature (1800[degrees]C).
Ground-based computers can use these measurements as a function of distance above Earth's surface to calculate atmospheric refractivity as a function of altitude.