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利用激光诱导击穿光谱(LIBS)技术进行飞灰含碳量分析时常用的C I 247.86 nm谱线附近存在强烈的谱线干扰。位于深紫外区无干扰的C I 193.09 nm常用作分析谱线以避免谱线干扰,但该谱线在空气中会被氧气吸收而影响定量分析的准确性。为了进一步提高利用该谱线定量分析飞灰含碳量效果,在光谱仪中充入氩气并在等离子体区域用氩气吹扫,对比分析了两种气氛下采用C I 193.09 nm谱线定量分析飞灰含碳量的效果。研究结果表明,在氩气气氛下获得的谱线强度及其信噪比、重复测量精度和含碳量的检测限均有显著改善,两个检验样品的含碳量预测绝对误差分别降至0.02%和0.42%(质量分数),含碳量的检测限也降至0.37%(质量分数)。
There is a strong spectral interference near the C I 247.86 nm line, which is commonly used in the analysis of carbon content in fly ash using laser induced breakdown spectroscopy (LIBS). Non-interfering C I 193.09 nm in the deep UV region is often used as the analysis line to avoid spectral interference, but this line is absorbed by oxygen in the air and affects the accuracy of the quantitative analysis. In order to further improve the quantitative analysis of fly ash carbon content by using this spectrometer, argon gas was filled into the spectrometer and purged with argon gas in the plasma region. The results of CI 193.09 nm spectral analysis Ash carbon content of the effect. The results show that the detection limits of the line intensity, the signal-to-noise ratio, the repetitive measurement accuracy and the carbon content obtained under the argon atmosphere are significantly improved. The absolute errors of predicted carbon content of the two test samples are reduced to 0.02 % And 0.42% (mass fraction), the detection limit of carbon content also dropped to 0.37% (mass fraction).