Transmittance


Transmittance

In optics and spectroscopy, transmittance is the fraction of incident light at a specified wavelength that passes through a sample.

:mathcal{T} = {Iover I_{0

where I_0 is the intensity of the light and "I" is the intensity of the light coming out of the sample. The transmittance of a sample is sometimes given as a percentage.

Transmittance is related to absorbance "A" as :A = - log_{10}mathcal{T} = - log_{10}left({Iover I_{0 ight)or, using the natural logarithm:A = - lnmathcal{T} = - lnleft({Iover I_{0 ight)

From the above equation and the Beer-Lambert law, the transmittance is thus given by

:mathcal{T} = e^{-alpha , x},

where alpha is the attenuation coefficient and x is the path length. Note that the term "transmission" refers to the physical process of light passing through a sample, whereas "transmittance" refers to the mathematical quantity.

ee also

*Opacity (optics)


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  • Transmittance — Trans*mit tance, n. Transmission. [1913 Webster] …   The Collaborative International Dictionary of English

  • transmittance — index delivery, transmittal Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • transmittance — 1855, from TRANSMIT (Cf. transmit) + ANCE (Cf. ance) …   Etymology dictionary

  • transmittance — [transmit′ ns, tranzmit′ ns] n. 1. the act or process of transmitting 2. the ratio of the radiant energy transmitted by a body to the total radiant energy received by the body …   English World dictionary

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