Attenuation Coefficient
From ExoDictionary
This definition page has been automatically generated. You can help ExoDictionary by expanding, updating, or correcting it. |
This autostub has not yet had its initial copyediting proof and may contain significant formatting and even factual errors. You can improve Exodictionary by cleaning up the page markup and verifying that the definition is correct and then removing this tag. |
This autostub has not yet had its initial categorization proof and may be categorized incorrectly. You can improve Exodictionary by removing inappropriate categories and then removing this tag. |
Attenuation Coefficient
(symbol Missing Image:IMG SRC="equat/alphasm.gif" WIDTH=14 HEIGHT=11 alt="attenuation coefficient symbol")
A measure of the space rate of attenuation of any transmitted
electromagnetic radiation. The
attenuation coefficient is defined by
<math>dI = -aI_{0}dx
or
I = I_{0}e^{-ax}</math>
where I is the flux density at the selected point in space;
<math>I_{0}</math>
is the flux density at the source; x is the distance from the
source; and a is the attenuation coefficient.
In general, the attenuation coefficient is specified only
when the attenuation is known to be due to both absorption and
scattering, or when it is impossible to determine which is the
cause. See
absorption coefficient,
scattering coefficient.
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use