Laser induced Fluorescence (LIF) spectroscopy
Laser induced Fluorescence spectroscopy (LIF) can be used to complement other spectroscopy techniques such as Raman and reflectance spectroscopy to identify and characterise materials. Remote UV LIF spectroscopy at standoff distances of upto tens of metres can be used to conveniently analyse any spot on a monument/object from the ground level without having to move the instrument. Given the non-invasive nature of the technique, it can also be used for mapping an area remotely (fluorescence mapping).
Material identification (e.g. organics and semi-conductors)
In-house remote LIF spectrometer in action.
LIF spectroscopy for material Identification
LIF is a technique that can complement the other non-invasive spectroscopic techniques in material identification.
(a) Reflectance spectral comparison between cadmium red (blue curve) and vermilion (red curve) references in oil. These pigments have similar spectral features, with their inflection points being at close wavelengths, making their distinction difficult. (b) LIF spectral comparison shows a clear difference between cadmium red and vermilion, complimenting their ID.