Also known as transmittance optical density, optical density, transmittance density, absorbance, spectral decadic absorbance
In spectroscopy, absorbance (abbreviated as A) is a logarithmic value which describes the portion of a beam of light which does not pass through a sample. Whilst the name refers to the absorption of light, other interactions of light with a sample (reflection, scattering) may also contribute to attenuation of the beam passing through the sample. The term "internal absorbance" is sometimes used to describe beam attenuation caused by absorption, while "attenuance" or "experimental absorbance" can be used to emphasize that beam attenuation can be caused by other phenomena.
Wikidata facts
Show 2 more facts
- recommended unit of measurement
- 1
- maintained by WikiProject
- WikiProject Mathematics
Sources (2)
via Wikidata · CC0
Article · 中文
當大部分光經過一個樣本時，部分光會被吸收。在光譜學，透光率是透射光和入射光的光強比： ； 其中，是入射光光強，是透射光光強。 吸光度的定義為： 。 對於不同波長（λ）的光，樣本的吸光度未必一樣。 對於較稀的溶液，吸光度和濃度成正比，兩者關係可用比爾-朗伯定律說明： ； 其中，是光在樣本中經過的距離，是濃度，是吸收係數，是材質的性質。 實驗中，吸光度或透光率可用色度計求得。
Abstract from DBpedia / Wikipedia · CC BY-SA