Influence of Humidity on Characteristic of Laser-Induced Soil Plasmas
LU Cui-ping, LIU Wen-qing*, ZHAO Nan-jing, LIU Li-tuo, CHEN Dong, ZHANG Yu-jun, LIU Jian-guo
Key Laboratory of Environment Optics and Technology, Chinese Academy of Sciences, Anhui Province Laboratory of Environment Optics Monitoring Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
Abstract：The soil samples at six different humidities were prepared for studying the influence of soil humidity on laser-induced plasmas. By analyzing the characteristic spectral lines of Pb with the wavelength of 405.78 nm, it was demonstrated that the intensities of spectral line, SNR and RSD are linearly inversely proportional to the soil humidity. Under the approximation of local thermal equilibrium, by analyzing the characteristic spectral lines of Fe within the wavelength range of 400 to 440 nm, the temperature of plasmas was obtained by means of the two-dimensional Boltzmann plane. The experimental results show that the plasma temperature monotonously changes from 11 800 to 7 800 K and the electron density monotonously changes from 3.3×106 cm-3 to 2.8×106 cm-3, when the humidity increases from 0 to 20%.
Key words：Laser-induced breakdown spectroscopy;Laser induced plasma;Soil humidity;Plasma temperature;Electron density
鲁翠萍，刘文清*，赵南京，刘立拓，陈 东，张玉钧，刘建国 . 湿度对激光诱导土壤等离子体特性的影响[J]. 光谱学与光谱分析, 2010, 30(11): 2885-2888.
LU Cui-ping, LIU Wen-qing*, ZHAO Nan-jing, LIU Li-tuo, CHEN Dong, ZHANG Yu-jun, LIU Jian-guo . Influence of Humidity on Characteristic of Laser-Induced Soil Plasmas . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2010, 30(11): 2885-2888.
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