不同关键参数下激光剥蚀-脉冲放电击穿煤粉等离子体的光谱特性研究
摘要
激光剥蚀-脉冲放电等离子体光谱技术将样品的剥蚀和击穿过程分离,使用低能量的激光剥蚀煤样能够减少激光热效应造成的煤中挥发分析出,减小基体效应,提高定标模型精度,是一种具有发展潜力的光谱测量技术。为了降低实验参数对光谱信号和定量分析结果的影响,本文研究了氮气气氛下收光延时、气流流量和激光能量对谱线强度和信背比的影响。实验结果表明,收光延时、气体流量分别为20μs、3L/min时,CⅠ247.86nm谱线的信背比最高;当激光能量为100mJ/pulse时,该谱线的信背比最高,但是煤样上方有明显的火焰产生,挥发分严重析出,不利于煤的定量分析。当激光能量小于100mJ/pulse时,样品上方的火焰不明显,并且90mJ时的信背比最高。本研究对优化LA-SIBS测试的实验参数,提高测量精度有重要的参考价值。
引文
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[2]肖宝兰,李凤瑞,唐玉国,等.煤质在线分析技术应用现状及研究[J].吉林电力,2003(1):27-29.
[3]钟厦.基于激光诱导击穿光谱技术的煤中元素快速测量研究[D].浙江大学,2016.
[4]董美蓉,陆继东,姚顺春,等.基于多元定标法的煤粉碳元素LIBS定量分析[J].工程热物理学报,2012,33(1):175-179.
[5]张雷,侯佳佳,赵洋,等.激光诱导击穿光谱精确测定燃煤工业分析指标的研究[J].光谱学与光谱分析,2017,37(10):3198-3203.
[6]Yao S,Zhao J,Xu J,et al.Optimizing the binder percentage to reduce the matrix effects for the LIBSanalysis of carbon in coal[J].Journal of Analytical Atomic Spectrometry,2017,32(4):766-772.
[7]Lepore K H,Fassett C I,Breves E A,et al.Matrix Effects in Quantitative Analysis of Laser-Induced Breakdown Spectroscopy(LIBS)of Rock Powders Doped with Cr,Mn,Ni,Zn,and Co.[J].Applied Spectroscopy,2017,71(4):600-626.
[8]谢承利.激光诱导击穿光谱数据处理方法及在燃煤分析中的应用研究[D].华中科技大学,2009.
[9]Windom B,Hahn D.Laser ablation-laser induced breakdown spectroscopy(LA-LIBS):A means for overcoming matrix effects leading to improved analyte response[J].Journal of Analytical Atomic Spectrometry,2009,24(12):1665-1675.
[10]Pareja J,López S,Jaramillo D,et al.Laser ablationlaser induced breakdown spectroscopy for the measurement of total elemental concentration in soils.[J].Applied Optics,2013,52(11):2470-2477.
[11]Hunter A J,Morency J R,Senior C L,et al.Continuous emissions monitoring using spark-induced breakdown spectroscopy[J].Air Repair,2000,50(1):111-117.
[12]Hunter A J,Wainner R T,Piper L G,et al.Rapid field screening of soils for heavy metals with spark-induced breakdown spectroscopy[J].Applied Optics,2003,42(12):2102-2109.
[13]CHENG Yu-qi,Zhang Qian,Li Guan,et al.Laser ignition assisted spark-induced breakdown spectroscopy for the ultra-sensitive detection of trace mercury ions in aqueous solutions[J].Journal of Analytical Atomic Spectrometry,2010,25(12):1969-1973.
[14]Diwakar P K,Kulkarni P.Measurement of elemental concentration of aerosols using spark emission spectroscopy[J].Journal of Analytical Atomic Spectrometry,2012,27(7):1101-1109.
[15]Pavan K.Srungaram,Krishna K.Ayyalasomayajula,Fang Yu-Yueh,Jagdish P.Singh,Comparison of laser induced breakdown spectroscopy and spark induced breakdown spectroscopy for determination of mercury in soils[J].Spectrochimica Acta Part B,2013,87:108-113
[16]Sobral H,Robledo-Martinez A.Signal enhancement in laser-induced breakdown spectroscopy using fast square-pulse discharges[J].Spectrochimica Acta Part BAtomic Spectroscopy,2016,124:67-73.
[17]Robledo-Martinez A,Sobral H,Garcia-Villarreal A.Effect of applied voltage and inter-pulse delay in sparkassisted LIBS[J].Spectrochimica Acta Part B Atomic Spectroscopy,2018,144:7-14.
[18]Li Ke-xue,Zhou Wei-dong,Shen Qin-mei,et al.Signal enhancement of lead and arsenic in soil using laser ablation combined with fast electric discharge[J].Spectrochimica Acta Part B Atomic Spectroscopy,2010,65(5):420-424.
[19]Hartig K C,Colgan J,Kilcrease D P,et al.Nist Atomic Spectra Database(version 5.2)[J].Journal of Applied Physics,2015,64(4):56-66.