standoff Raman

Raman Spectroscopy measures molecular structures within a material using monochromatic laser illumination. When photons are incident on a material, a small number may inelastically scatter. This will cause an increase in the wavelength of the scattered photon from the original excitation wavelength (Stokes Raman shift). As Raman scattering is linked to the vibrational state of a molecule, the measurement of the spectrum relative to the Raman shift can provide characteristic features for material identification that is highly specific and can be used to identify the materials present. Remote Raman spectroscopy extends the working distance to standoff distances of up to tens of metres and 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 a small region remotely (macro-Raman mapping). It can be used with complementary techniques such as remote reflectance spectral imaging for a more specific identification of a material.

Remote raman/lif spectroscopy

Analysis Method

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