Fibre optic reflectance spectroscopy (FORS) is a non-invasive technique which shows the reflectance, absorbance or transmittance features of materials in a spectral profile, covering the ultraviolet (UV), visible (Vis), near (NIR) and shortwave infrared (SWIR) part of the electromagnetic spectrum.
Fibre optic reflectance spectra are acquired through Ocean Optics USB2000+ Spectrometer responds in the range 400–800 nm. After the selection of the measurement points, guided by the results previously obtained by the MSI techniques, a broad-band light source (probe) is positioned on the area of interest.
The spectral profile produced shows the behavior of a material to light which is reliant on its chemical composition. Consequently, this technique often provides conclusive information on the nature of coloring matters.