Transmittance

Encyclopedia : T : TR : TRA : Transmittance

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

[T = }]

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 usually given as a percentage, defined as

[T\% = } * 100\%]

Transmittance is related to absorbance A as

[A = - \log_T\ = - \log_}\,]

[A = 2 - \log_T\%\,]

where T% is the percent transmittance and T is "per one" transmittance.

Note that the term transmission refers to the physical process of light passing through a sample, whereas transmittance refers to the mathematical quantity.

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