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利用波长为1064 nm的Nd∶YAG脉冲激光器作光源,以高分辨率、宽光谱段的中阶梯光栅光谱仪和增强型电荷耦合器件(ICCD)作为谱线分离与探测器件,测量并分析了激光能量及重复频率对土壤中铅元素激光诱导击穿光谱特性的影响。实验结果表明,随着激光脉冲能量(在25~105 mJ范围内)增加,谱线强度呈线性增加,随后谱线强度随脉冲能量(105~165 mJ)的变化呈非线性关系。信背比随激光能量的增加而增大,但激光能量超过60 mJ后基本上不变。激光重复频率为1 Hz时,谱线强度最大,而谱线强度的相对标准偏差则在重复频率为7 Hz时最小。
Using a Nd: YAG pulsed laser with a wavelength of 1064 nm as a light source, a high-resolution, wide-band, middle-stepped grating spectrometer and an enhanced charge coupled device (ICCD) were used as the spectral line separation and detection devices. Laser energy And the effect of repetition frequency on laser-induced breakdown spectroscopy of lead in soils. Experimental results show that with the increase of laser pulse energy (in the range of 25 ~ 105 mJ), the line intensity increases linearly, and then the line intensity shows a nonlinear relationship with the pulse energy (105 ~ 165 mJ). The signal-to-background ratio increases with the increase of laser energy, but the laser energy does not change substantially beyond 60 mJ. When the laser repetition frequency is 1 Hz, the spectral line intensity is the maximum, while the relative standard deviation of the spectral line intensity is the smallest when the repetition frequency is 7 Hz.