Transmission Coefficient

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Transmission Coefficient

1. A measure of the amount of incident radiation which remains in a beam after it passes through a unit thickness of a medium. It is comparable in concept to the extinction coefficient (or attenuation coefficient) and is related to the extinction coefficient σ as follows:

τ = e
where τ is the transmission coefficient. Its

relationship to transmissivity r is expressed:

r = τx
where x is the total thickness of the

medium. Compare absorption coefficient. </dd>
2. The fraction of the solar radiation normally incident upon the top of the atmosphere which survives passage through the atmosphere to the earth's surface. As so defined, a better term might be atmospheric transmissivity. </dd>
3. The ratio of the sound transmitted through an interface or spectrum between two media, exposed to the sound field, to the sound energy incident on the interface or septum. [[/a>|/a> ]]


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use