双脉冲激光诱导击穿光谱实验方法及数据处理方法研究

发布时间：2018-04-30 10:19

本文选题：激光诱导击穿光谱 + 双脉冲　；参考：《北京理工大学》2015年硕士论文

【摘要】：激光诱导击穿光谱(Laser-induced Breakdown Spectroscopy,LIBS)是近几十年发展起来的一种基于原子发射光谱的物质分析新技术,其基本原理是将激光束利用光学系统聚焦击打材料样品表面,烧蚀样品产生等离子体,经由光谱仪接收,通过软件实时分析光谱中的原子和离子谱线,从而进行定性或者定量分析。作为一种快速发展的光谱检测手段,激光诱导击穿光谱具有分析速度快、破坏性小、能进行多种元素实时分析等显著特点。本论文在实验室环境下建立了再加热双脉冲激光诱导击穿光谱实验系统,对比了单脉冲激光诱导击穿光谱和双脉冲激光诱导击穿光谱的信号强度和稳定性,并研究了双脉冲LIBS系统当中激光束之间的夹角对光谱信号强度的影响。此外,在LIBS光谱数据处理方面,进行了样品分类模型适应性的研究。分别比较了利用偏最小二乘法和人工神经网络建立的分类模型在不同激发条件下的适应性。
[Abstract]:Laser-induced Breakdown spectroscopy (LIBS) is a new technique for material analysis based on atomic emission spectroscopy developed in recent decades. Its basic principle is to focus the laser beam on the surface of material by optical system. Plasma is generated from the ablated sample and received by spectrometer. The atomic and ionic lines in the spectrum are analyzed in real time by software and then the qualitative or quantitative analysis is carried out. As a rapidly developing method of spectrum detection, laser induced breakdown spectroscopy has the advantages of fast analysis speed, low destructive, and can be used for real-time analysis of various elements. In this paper, the experimental system of reheating double-pulse laser induced breakdown spectrum is established in laboratory environment, and the signal intensity and stability of single-pulse laser induced breakdown spectrum and double-pulse laser induced breakdown spectrum are compared. The influence of the angle between the laser beams on the intensity of the spectral signal in the dual pulse LIBS system is studied. In addition, in the aspect of LIBS spectral data processing, the adaptability of sample classification model was studied. The adaptability of classification models based on partial least square method and artificial neural network under different excitation conditions was compared.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN249;TP274.2

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