Fluorescence spectroscopy has been successfully applied to the identification of colorants in oil paintings and murals due to the advantage of non-destructive detection, but the traditional equipment uses xenon lamp as the excitation light source, which is energy inefficient in the process of using, and the monochromatic light output power is weak and unstable. This paper proposes the use of ultra-continuous spectrum broad-band tunable laser with fiber optic sensors to achieve effective detection of weak fluorescence signals of silk dyes, compared with the traditional 3D-fluorescence equipment, single-wavelength excitation light output power is greatly increased, higher monochromaticity and energy density to achieve better spatial resolution and faster detection efficiency, while adding fiber optic sensors can be done to achieve the surface of the painted artifacts in situ non-destructive detection. The proposed method can detect more weak fluorescence information under the comparison results of multiple dyed silk samples with different fluorescence emission effects. Acknowledgement: This project is funded by National Key R&D Program of China No.2020YFE0204600.
The ceramics is easily broken due to various reasons. These reasons include unearthed excavation, careless operation and so on. When the ceramics is broken in pieces, the antique restorers take advantage of the adhesive to stick these fragments together to exhibit the beauty of original cultural relics. Therefore, the removal of adhesives such as adhesives on the cross-section of ceramic samples is a very important link in the restoration and protection of cultural relics and has important significance. In ancient times, the way of restoring these ceramics is so inappropriate and unreasonable that the adhesive is left among the cross section of these pieces. It becomes a problem for the following antique restorers. In order to solve this problem, we select a piece of the ceramics that possess above characteristics by utilizing laser to clean the left adhesive on the cross section tentatively. To better explore the optimized cleaning parameters relatively, we have made standard samples of adhesive to get better cleaning effect. These results will provide the reference value to our following study.
By utilizing terahertz time-domain spectroscopy and fourier-transform infrared spectroscopy, several kinds of traditional Chinese pigments have been investigated covering the spectral region 0.25 THz- 7 THz. The experimental results demonstrate that all pigments studied in the present work show a series of characteristic absorption spectra, which are unique to the pigment species. According to the fingerprint spectra, we can confirm that the traditional Chinese pigments have been applied to the heritage buildings and artworks. Compared with X-ray diffraction, Raman spectroscopy and near-infrared spectroscopic techniques, these experimental results reveal that terahertz time-domain spectroscopy could further fill their physical information what other techniques cannot obtain.
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