UV/VIS/NIR Spectrophotometer for clear, turbid or diffuse Samples
UV/VIS/NIR spectroscopy is an established measurement technique for decades with many applications.
The most common case is the measurement of clear samples:
Mostly absorption, reflection and transmission are measured (DIN 5036-3,CIE-130-1998). Especially the spectral absorption coefficient µa is an important physical quantity for further analysis because it allows statements about the composition of the sample.
Challenge of measuring diffuse, turbid and scattering samples:
The measurement or investigation of scattering/diffus/turbid samples is a greater challenge, since a large number of effects such as scattering in the material, absorption and remission have to be taken into account. Physically, this means that in addition to the spectral absorption coefficient µa, the spectral effective scattering coefficient µs must also be determined. For scattering samples, the effective scattering coefficient µs' (also called reduced scattering coefficient) provides further analysis possibilities.