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设计的激光等离子体发射光光纤耦合系统,可以在提高等离子体发射光光纤耦合效率的同时减小耦合系统的尺寸,从而为激光诱导击穿光谱技术应用到快速、现场、在线的物质成分分析提供硬件基础。耦合系统为三镜片结构,通过单片透镜对等离子体发射光进行准直并通过由两片负、正透镜组成的反远距物镜结构将光束耦合进入光纤。耦合系统对等离子体发射光在铅、铜、镍、铬以及镉等元素的分析线波长处的光纤耦合效率均高于92%,且系统孔径小于6 mm,系统总长小于30 mm。采用所设计的耦合系统对土壤中的铬元素以及某铅蓄电池厂固体废弃物铅泥中的铅元素进行了检测,并与采用一般双透镜收集系统以及光纤直接接收的方式进行比较,进一步验证了耦合系统所获取光谱的元素特征谱线更加明显并易于识别,同时所得元素检测限更低,且光谱数据稳定,更利于后续的光谱分析与元素浓度定量反演。
The designed laser plasmon emission optical fiber coupling system can reduce the size of the coupling system while improving the coupling efficiency of the plasma emission optical fiber and thus provide a rapid, on-site and on-line analysis of the composition of the material by using laser-induced breakdown spectroscopy Hardware base. The coupling system is a three-lens structure that collimates the plasma emission light by a single lens and couples the light beam into the optical fiber through an anti-distant objective lens structure consisting of two negative and positive lenses. The coupled system has higher than 92% fiber coupling efficiency for the plasma emission at the analytical line wavelength of lead, copper, nickel, chromium and cadmium. The system aperture is less than 6 mm and the total system length is less than 30 mm. The designed coupling system was used to test the lead in the soil and lead in the solid waste of a lead-acid battery plant. The results were compared with those obtained by using the general two-lens collecting system and direct optical fiber receiving. The spectral characteristic of the spectra acquired by the coupled system is more obvious and easily identifiable. At the same time, the detection limit of the obtained elements is lower and the spectral data is stable, which is more conducive to the subsequent spectral analysis and quantitative inversion of elemental concentrations.