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Reflectance and Transmittance Spectroscopy

Reflectance is a measure of the fraction of incident radiant energy that is reflected off a surface or a series of optical interfaces. Transmittance measures the fractional radiant energy transmitted through an optical material. These parameters are often measured as a function of wavelength – hence, reflectance and transmittance spectroscopy. Both of these spectroscopies are some of the earliest studied due partly to the simplicity in observation of the phenomenon. Their usefulness derives from the fact that light interaction with matter, whether in reflection or transmission modes, often carries signatures of the material in the reflected or transmitted emission and therefore provides a simple, non-contact method of characterizing such materials.

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Reflectance & Transmittance (SMS eBook)

Transmittance is a derived observation from light scattering and absorption. In other words, when light is incident on a material, some of it is scattered at interfaces and another portion gets absorbed. What is left goes through the material and comes out as transmitted light. Therefore, transmittance light indirectly measures the absorbance of the material. Indeed, these two are related.

Reflectance and Transmittance Spectroscopy

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