| Ancient human beings were in the creation of brilliant history at the same time, but also for us to leave the fine painting relics, which express at the time the people of this colorful world of thoughts and viewsat that time. The scientific understanding of these pigments is conductive to a better understanding of the development of human society and science and technology at that time. In the use of ancient pigments, the mineral pigments were often used to decorated pottery,mural and other artifacts. In addition to the use of a single pigment, the ancient craftsmen also apply mixed pigments,in order to achieve a better artistic expression.In order to understand the matching process of the ancient painted pigments, XRD was used to the analysis structural, but the sample needs a large amount. It is also possible to derive the pigment mixing ratio indirectly by means of elemental analysis such as energy spectrum and fluorescence, but it is not possible to analyze the case of pigment such as isomerism.Conventional Raman spectroscopy has the advantage of small sample size, small loss and even losslessness. However, the commonly used analysis method of point analysis determines that it can only reach the qualitative analysis and can not be quantitatively analyzed. In order to understand the ancient painting pigment matching technology, the simulation experiment on the quantitative analysis of ancient pigments by Raman spectroscopy was carried out in the thesis. Based on the qualitative analysis of the mixture pigments by Raman spectra, trying to study the quantitative or semi quantitative analysis of mixes pigments in ancient Chinese painting by rapid scanning technique of Raman spectroscopy, and opens the new application of Raman spectroscopy in the quantitative aspect of ancient painted pigments.The two groups standard mixed pigment samples was determined,that are cinnabar and red lead, azurite and malachite. Each sample was set to 1:1,1:2,1:3,1:4 and 1:5. EpoxiCure (TM) 2 Epoxy Resin and EpoxiCure (TM) 2 Epoxy Hardener were selected as the embedding resins to prepare Raman samples. The standard mixed sample was detected using a streamline large area fast scan imaging system. The experimental conditions were as follows:514nm laser,20mW laser power and 10s excitation time. Three areas of each sample were selected to obtain the area distribution of the mixed pigment in the sample and the proportion of each substance in the detection area. The experimental results show that the standard mixed pigment can be semi-quantitatively analyzed by the micro-laser Raman spectrometer. The error range is about 10%. The feasibility of quantitatively analyzing the pigment by Raman spectroscopy was analyzed by X-ray diffraction, powder polarizing microscopy and scanning electron microscopy, and the reason of the error was analyzed.The quantitative analysis method was applied in the semi quantitative analysis of pigments from terra-cotta warrior, and the ratio of mixture pigments in the sample was obtained.It is also the first attempt to use Raman spectroscopy for quantitative analysis of the ancient painted pigment. |
PDF Full Text Request