Attenuation
Attenuation is to lessen the amount, force, magnitude, or value of something.
1. In biology, attenuation is a mechanism in the regulation of gene expression
2. In ecology and geochemistry, attenuation is the ability to withhold contaminants in soil and groundwater by various mechanisms like adsorption, dilution, dispersion or biological
degradation, causing a decrease in concentration and toxicity compared to the total amount of the
contaminant.
3. In physical oceanography, light attenuation
is the decrease in light intensity with depth in the water column due to
absorption (by water molecules) and scattering (by suspended particulates).
4. In telecommunication, attenuation is the decrease in
intensity of a signal, beam, or wave as a result of absorption of energy
and of scattering out of the path to the detector, but not including the reduction due to geometric spreading.
- Note 1: Attenuation is usually expressed in dB.
- Note 2: "Attenuation" is often used as a misnomer for "attenuation
coefficient, " which is expressed in dB per kilometer.
- Note 3: A distinction must be made as to whether the attenuation is that of signal power or signal electric field
strength.
- Source: from Federal Standard 1037C and adapted
from the Department of Defense Dictionary of Military and Associated
Terms
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