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Impact of plasma dynamics on equivalence ratio measurements by laser-induced breakdown spectroscopy

机译：等离子体动力学对激光诱导击穿光谱法测量当量比的影响

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The systematic errors introduced by triggering a USB spectrometer for laser-induced breakdown spectroscopy equivalence ratio measurements are studied. We analyze the temporal behavior of laser-induced plasma in a nonreacting methane/air mixture and investigate the influence of the dynamics on equivalence ratio measurements with gated and ungated detection. For use of gated detectors, optimal delay times were found to be between 500 and 2000 ns to allow effective suppression of interferences while maintaining sufficient signal-to-noise levels. Good precision was found for short and long exposure time intervals when an intensified CCD camera was employed. On the other hand, the jitter of an externally triggered ungated spectrometer leads to high uncertainties. Running the ungated spectrometer freely, the single-shot uncertainty can be reduced by more than 1 order of magnitude. (C) 2015 Optical Society of America
机译：研究了通过触发USB光谱仪进行激光诱导击穿光谱当量比测量而引入的系统误差。我们分析了在非反应性甲烷/空气混合物中激光诱导等离子体的时间行为，并研究了门控和非门控检测对动力学当量比测量的影响。对于使用门控检测器，发现最佳延迟时间在500到2000 ns之间，以在保持足够的信噪比水平的同时有效地抑制干扰。使用增强型CCD相机时，无论短时间间隔还是长时间曝光间隔，都具有良好的精度。另一方面，外部触发的非门控光谱仪的抖动会导致高度不确定性。自由运行无电极的光谱仪，单次不确定性可以降低1个数量级以上。 （C）2015年美国眼镜学会

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