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Transmittance

Definition: the ratio of transmitted optical power to the incident optical power at some partial transparent object

German: Transmissionsgrad, Transmissionsvermögen

Category: general optics

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The term transmittance is defined as the ratio of transmitted optical power to the incident optical power for some object, for example an optical system. For transmission through flat unstructured surfaces, it is the same as the transmissivity. However, the transmittance is a more general term and can be specified in a wider range of situations:

The results of transmission measurements with spectrophotometers, for example, are usually called transmittance rather than transmissivity, since one is often dealing with extended samples.

See also: transmissivity, reflectance, absorbance
and other articles in the category general optics

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