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Optical emission enhancement in laser-induced breakdown spectroscopy using micro torches

机译：使用微炬增强激光诱导击穿光谱中的光发射

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摘要

A cost effective method for optical emission enhancement in laser-induced breakdown spectroscopy (LIBS) has been proposed in this research. The pulsed Nd:YAG laser with a wavelength of 532 nm was used for sample ablation and plasma generation. A cost effective commercial butane micro-torch was put parallel to the sample surface to generate a small flame above the surface. The laser-induced plasma expanded in the flame environment. The time-resolved optical emission intensity and signal-to-noise ratio (SNR) have been observed with and without micro torch. For laser with pulse energy of 20 mJ, the relationship between optical emission intensity and delay time indicates that signal intensities have been greatly enhanced in the initial several microseconds when using micro torch. The time-resolved study of signal-to-noise ratio shows that the maximum SNR occurs at the delay time of 2 us. The laser energy effects on the enhancements of optical emission intensity and SNR have also been analyzed, which indicates that the enhancement factors are both delay time and laser energy dependent. The maximum enhancement factors for both optical emission intensity and SNR gradually decreases with the laser energy increase. The limits of detection (LODs) for aluminum (Al) and molybdenum (Mo) in steel have been estimated, which shows that the detection sensitivity has been improved by around 4 times. The LODs of Al and Mo have been reduced from 18 to 6 ppm and from 110 to 36 ppm in LIBS, respectively. The method of LIBS by a micro torch has been demonstrated to be a cost effective method for detection sensitivity improvement, especially in the situation of low laser pulse energy.
机译：这项研究中提出了一种经济有效的方法来增强激光诱导击穿光谱法（LIBS）中的光发射。波长为532 nm的脉冲Nd：YAG激光器用于样品消融和等离子体产生。将具有成本效益的商品丁烷微炬与样品表面平行放置，以在表面上方产生小火焰。激光诱导的等离子体在火焰环境中膨胀。在有或没有微炬的情况下，都可以观察到时间分辨的光发射强度和信噪比（SNR）。对于脉冲能量为20 mJ的激光器，光发射强度与延迟时间之间的关系表明，在使用微炬时，在最初的几微秒内信号强度已大大提高。时间分辨的信噪比研究表明，最大SNR出现在2 us的延迟时间。还分析了激光能量对光发射强度和SNR增强的影响，这表明增强因子既与延迟时间相关，又与激光能量有关。随着激光能量的增加，光发射强度和SNR的最大增强因子逐渐减小。估计了钢中铝（Al）和钼（Mo）的检出限（LODs），这表明检出灵敏度提高了约4倍。在LIBS中，Al和Mo的LOD分别从18 ppm降低到6 ppm，从110 ppm降低到36 ppm。已经证明，使用微炬的LIBS方法是提高检测灵敏度的一种经济有效的方法，尤其是在低激光脉冲能量的情况下。

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  • 来源
    《Laser-based micro- and nanoprocessing X》|2016年|97361S.1-97361S.7|共7页
  • 会议地点 San Francisco CA(US)
  • 作者

    L. Liu; X. Huang; S. Li; Yao Lu; K. Chen; Y.F. Lu;

  • 作者单位

    Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511 USA;

    Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511 USA;

    Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, PA 15260 USA;

    Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511 USA;

    Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, PA 15260 USA;

    Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511 USA;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Laser-induced breakdown spectroscopy; micro torch; enhancement; detection sensitivity improvement;

    机译：激光诱导击穿光谱；微型割炬增强检测灵敏度的提高;

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