Raman spectroscopy with multiple-lasers for archaeological objects

点击翻译按钮获取中文摘要

The purposes of this research were development of laser Raman spectroscopy applied to archaeological objects and making a Raman spectrum library of archaeological materials.When irradiating the laser onto an object, Raman scattering may be obscured by the fluorescence that a sample produces. Moreover, the sample itself may absorb excitation laser, considerably reducing the efficiency of Raman scattering. Whatever the case may be, selecting the suitable excitation laser for the sample ensures a favorable spectrum. A trial equipment of laser Raman spectroscope was produced in 2004. Some defects of this trial one were conquered. As the results of this modification, portability and a part of spectroscope were unproved. In the last year, 2005, several problems, e.g., power of laser, rotation part of spectroscope, power supply, and so on, of this trial equipment were examined, a final equipment was obtained. By this improvement, a mobile laser Raman spectroscope with two lasers, i.e., 532 nm and 785 nm, has been completed for archaeological objects.With this mobile equipment and existing equipments of our laboratory, Raman spectra of standard samples and archaeological materials have been determined. These Raman spectra have been stored in a database file with use of commercial software. It is significant that laser Raman spectroscopy has become to as a quick analysis on-site.