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The underlying mechanism of the spectral cleaning effect of the cross-polarized wave(XPW) generation process was theoretically investigated. This study shows that the spectral noise of an input spectrum can be removed in the XPW generation process and that the spectral cleaning effect depends on the characteristics of the input pulses, such as the chirp and Fourier-transform-limited duration of the initial pulse, and the modulation amplitude and frequency of the spectral noise. Though these factors codetermine the output spectrum of the XPW generation process, the spectral cleaning effect is mainly affected by the initial pulse chirp. The smoothing of the spectrum in the XPW generation process leads to a significant enhancement of the coherent contrast.  相似文献   
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石墨炉原子吸收光谱法测定中药漏芦中微量镉的研究   总被引:4,自引:0,他引:4  
本文提出了石墨炉原子吸收光谱法(GFAAS)测定中药漏芦中微量镉的方法,对基体改进剂及其用量进行了选择试验,对石墨炉工作条件进行了优化,对共存离子的影响进行了考察,在优化实验条件下,方法的检出限为0.06ng.mL^-1,精密度(RSD)为2.43%,试样加入回收率为97-105%。  相似文献   
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