液体样品激光击穿光谱的时间分辨研究  

Study on LIBS Spectrum for Liquid Sample by Time Resolution

作　　者：吴金泉[1] 常亮[1] 刘林美[1] 徐小燕[1] 佘明军[2] 

机构地区：[1]中南民族大学激光光谱实验室,湖北武汉430074 [2]中原石油勘探局地质录井处,河南濮阳457001

出　　处：《应用激光》2011年第3期232-235,共4页Applied Laser

基　　金：国家自然科学基金资助项目(项目编号:50846041);中南民族大学青年基金资助项目(项目编号:YZQ10006);教育部长江三峡库区地质灾害研究中心开放基金资助项目(项目编号:TGRC201019)

摘　　要：激光击穿光谱(LIBS)是一种新的多元素同时探测的技术,但是光谱的采集时间、延时、门宽、等参数是影响将该技术推向实用化过程中的重要因素。本文利用LIBS技术对水溶液样品中的金属元素进行了时间演化研究,并通过对Al、Cd、Cu、Fe、Pb、Zn等五种元素的连续背景和采集时段对信噪比的影响分析,得到了这些元素的连续背景光谱强度只由实验条件决定,并且在同一个波长位置上的背景光谱强度不受元素种类和浓度的影响;采用相对较晚的采集延迟时间及相对较宽的采集门宽可以增加LIBS技术的检测能力,得到更低的检测限。实验所得的结果为探测工业废水中金属元素的含量的应用研究提供依据。Laser induced breakdown spectroscopy is another emerging technology to detect multiple elements at same time. But the spectrum acquisition time, delay, gate width, and other parameters are major influence factors to make LIBS technology more practical. In this paper, the metal elements in solution were detected with the method of time-evolution by laser-induced breakdown spectroscopy. Influence of the continuous background and the acquisition time on the signal to noise ratio was analyzed for the A1. Cd,Cu,Fe.Pb and Zn elements. It found that the continuous background intensity was decided by the experimental conditions, and the continuous background intensity of the same wavelength has no effect with the type and concentration of elements. The detect ability of LIBS was improved by relatively delay and acquisition gate width. The lower limit of detection would be obtained. The experiment results provided the basis for the detection of metallic elements in the industrial waste water.

关 键 词：元素分析 金属元素 激光击穿光谱 时间演化 连续背景 

分 类 号：TN247[电子电信—物理电子学]