中国激光, 2010, 37 (4): 1114, 网络出版: 2010-04-20
粉煤灰未燃碳的深紫外激光诱导击穿光谱分析
Analysis of Unburned Carbon in Coal Fly Ash by Using Laser-Induced Breakdown Spectroscopy in Deep UV
光谱学 激光诱导击穿光谱 粉煤灰未燃碳 深紫外 定标曲线 spectroscopy laser-induced breakdown spectroscopy unburned carbon of fly ash deep UV calibration curve
摘要
利用激光诱导击穿光谱技术,分析由快速灰化法制得的粉煤灰样品中的未燃碳。实验中发现,常用的C元素分析谱线C 247.86 nm附近存在明显的Fe 247. 95 nm谱线干扰,严重影响未燃碳的激光诱导击穿光谱分析。选用处于深紫外区不存在其他光谱干扰的C 193.03 nm谱线作为分析线,建立未燃碳的定量分析曲线。研究结果表明,在大气常压环境下,通过对光谱探测系统进行深紫外增强镀膜处理,选用短焦距准直透镜和抗紫外光纤,可以探测到明显的C 193.03 nm谱线,由此分析未燃碳可以得到良好的定标曲线,拟合度为0.99,检测限为0.74%(质量分数)。
Abstract
Laser-induced breakdown spectroscopy (LIBS) is used to analyze unburned carbon in fly ash. The samples are obtained by using fast ashing method. In the experiment,the carbon line at 247.86 nm presents strong interference by iron line at 247.95 nm,which affectes the analysis of unburned carbon by using LIBS. Without strong interference of other lines,the carbon line at 193.03 nm in deep UV is used,and calibration curve is constructed. The analysis results show that C 193.03 nm line can be detected at atmospheric pressure by using spectral detection system with deep UV detector coating,short focal length collimating lens and anti-UV fiber. The correlation coefficient of calibration curve is 0.99,and the detection of limit of unburned carbon is 0.74% (mass fraction).
姚顺春, 陆继东, 潘圣华, 蒋梅城, 李娉, 谢承利, 李捷. 粉煤灰未燃碳的深紫外激光诱导击穿光谱分析[J]. 中国激光, 2010, 37(4): 1114. Yao Shunchun, Lu Jidong, Pan Shenghua, Jiang Meicheng, Li Ping, Xie Chengli, Li Jie. Analysis of Unburned Carbon in Coal Fly Ash by Using Laser-Induced Breakdown Spectroscopy in Deep UV[J]. Chinese Journal of Lasers, 2010, 37(4): 1114.