# Transmittance

Transmittance

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

:$mathcal\left\{T\right\} = \left\{Iover I_\left\{0$

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 :$A = - log_\left\{10\right\}mathcal\left\{T\right\} = - log_\left\{10\right\}left\left(\left\{Iover I_\left\{0 ight\right)$or, using the natural logarithm:$A = - lnmathcal\left\{T\right\} = - lnleft\left(\left\{Iover I_\left\{0 ight\right)$

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

:$mathcal\left\{T\right\} = e^\left\{-alpha , x\right\}$,

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)

Wikimedia Foundation. 2010.

Синонимы:

### См. также в других словарях:

• transmittance — ● transmittance nom féminin (anglais transmittance) Synonyme de fonction de transfert. ● transmittance (synonymes) nom féminin (anglais transmittance) Synonymes : fonction de transfert …   Encyclopédie Universelle

• 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

• Transmittance — En général, la transmittance est le rapport caractérisant la transmission d une grandeur dans un système. Elle se calcule par le rapport entre la grandeur en entrée et en sortie. Optique En optique, la transmittance d un matériau ou d un filtre… …   Wikipédia en Français

• transmittance — praleidimo faktorius statusas T sritis Standartizacija ir metrologija apibrėžtis Praleistos ir krintančios garso galių dalmuo. atitikmenys: angl. transmission factor; transmittance vok. Übertragungsfaktor, m; Transmissionsgrad, m rus. коэффициент …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

• transmittance — praleidimo faktorius statusas T sritis Standartizacija ir metrologija apibrėžtis Praleistos ir krintančios spinduliuočių ar šviesos srautų dalmuo. atitikmenys: angl. transmission factor; transmittance vok. Übertragungsfaktor, m; Transmissionsgrad …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

• transmittance — praleidimo faktorius statusas T sritis fizika atitikmenys: angl. transmission factor; transmittance vok. Übertragungsfaktor, m; Transmissionsgrad, m rus. коэффициент пропускания, m pranc. facteur de transmission, m; transmittance, f …   Fizikos terminų žodynas

• transmittance — praleidimo koeficientas statusas T sritis automatika atitikmenys: angl. transmission factor; transmittance vok. Durchlaßgrad, m; Transmissionsgrad, m rus. коэффициент пропускания, m pranc. facteur de transmission, m ryšiai: sinonimas – praleidimo …   Automatikos terminų žodynas

### Поделиться ссылкой на выделенное

##### Прямая ссылка:
Нажмите правой клавишей мыши и выберите «Копировать ссылку»