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.
Mid-Focal Length Imaging Spectrometers
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