Portable Raman Spectroscopy is a very useful tool for studying archeological sites, enabling in situ analysis and thus reducing the impact of these kinds on key cultural sites.
With a reduction in the size of the Raman spectrometer, there has been an increase in the usage of Raman spectroscopy for archeological investigations. The portability enables on-site analysis without the need to remove the samples or disputing important archeological sites.
Portable Raman instruments include a fiber optic probe, which helps reach samples easily in varying conditions. Samples beyond reach can also be studied using the fiber probe. The portability of the instrument and the fiber optic probe is used for measuring samples of different shapes and sizes. It is possible to adjust the laser power at 1% increments, which allows for low laser power (3 mW). This Raman system is ideal for working with challenging samples like dark pigments.
The chemical identification is an important part of analyzing archeological artifacts and artworks. It is possible to obtain this data through non-destructive Raman analysis directly in the environment, in which artifacts have been discovered. These data forms are the basis for the identification of dyes, paints, and pigments, indicating when and how a piece was made.
In recent studies, a portable Raman system was used for characterizing prehistoric paintings on the Abrigo de Los Chaparros on the Iberian Peninsula. These paintings made Raman measurements challenging because of wind, sunlight, and crusts and dust that may have formed on the surface. In addition to this, portable Raman spectrometers are being utilized in a detailed study of materials used in the plasterwork in vaults of the Alhambra of Kings in Spain.
Optromix Raman fiber optic probes are miniaturized without compromising its performance, which is enabled by the technology of direct deposition of the dielectric filters at the fiber end faces. In results in a small, cost-effective Raman probe for different Raman systems and, for example, for endoscopic and other applications.
The fiber optic Raman probe is produced for multi-wave excitation in the range 690-785 nm and 1000-1064 nm, e.g. @785 nm – “Fingerprint” spectral range with fluorescence reduction, and @690 nm – “High wavelength” spectral range for conventional Raman spectrometers.