Absorption Coefficient


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absorption coefficient

[əb′sȯrp·shən ‚kō·ə′fish·ənt]
Also known as absorption factor; absorption ratio; coefficient of absorption.
(acoustics)
The ratio of the sound energy absorbed by a surface of a medium or material to the sound energy incident on the surface.
(physics)
If a flux through a material decreases with distance x in proportion to e-ax, then a is called the absorption coefficient.

Absorption Coefficient

 

(kv), the inverse of the distance at which a monochromatic radiation flux that has frequency ν and forms a parallel beam is attenuated—owing to absorption in a substance—to 1/e (natural absorption coefficient) or 1/10 (decimal absorption coefficient) of its incident intensity. In the case of 1/e, the Bouguer-Lambert law is written

I = I0e-kvI

In the case of 1/10, the law is written

I = I010-kvI

The absorption coefficient is measured in cm-1 or m-1, and it is traditionally called the absorption factor in spectrography and some other branches of applied optics.

sound absorption coefficient,

a The fraction of the sound energy (incident at random angles on a surface) which is absorbed or otherwise not reflected by the surface.
References in periodicals archive ?
Normandin, and P Goudreau, "Effect of surface temperature on water absorption coefficient of building materials," Journal of Thermal Envelope and Building Science, vol.
The effect of microbubbles on reduced scattering and absorption coefficients decreased at longer wavelengths.
These dyes possess high absorption coefficients and low quantum yield, making them effient contrast agents for PA imaging.
The mass-energy absorption coefficients will depend not only on the choice of the atomic cross-section library, but also on the method used to interpolate the tabulated data to obtain values at the required photon energies.
Moreover, within the kinetic model, the hot-plasma dispersion relation describes damping consistently through the imaginary part of the wavenumber, which is equal to the absorption coefficient.
BODIPY compounds have superior photochemical and photophysical characteristics such as high chemical and photostability, high absorption coefficients, high fluorescence quantum yields, and narrow absorption and emission bands (Loudet & Burgess 2007; Ulrich et al.
The transmitters accept inputs from up to eight Endress+Hauser Memosens digital sensors including nitrate, spectral absorption coefficient (SAC), pH, ORE, conductivity, dissolved oxygen, turbidity, free-chlorine and ion selective electrode sensors.
6 to 18 pm, have a low absorption coefficient of 0.
Liquiline CM44 series multichannel transmitters accept inputs from up to eight of the company's Memosens digital analytical sensors, including nitrate, spectral absorption coefficient (SAC), pH, ORP, conductivity, oxygen, turbidity and ion selective electrode sensors.