To study the spectrm processing methods for Raman microscopy on single living cell and develop the pre-process techniques for Raman spectrum of single living cell to enhance the signal to noise ratio, sensitivity, and decrease the fluorescence influence, wiping off the cosmic rays was used to improve the spectrum. The spectra classification, spectra average and filtration were applied to enhance signal to noise ratio. The fluorescence was depressed for quantity analysis or utilized for analysis by comparing the background and the spectra. Results show that (1) comparing the spectra with short exposure time and more scans can wipe off the cosmic rays effectively. (2) the spectra classification, spectra average and filtration can improve the quality of spectra and can show some weak and sensitive bands. (3)sometimes the fluorescence has useful information. It is concluded that the proposed techniques for Raman spectrum of single cell in this paper can show the sensitive and weak intensity peaks and reflect the information of molecules structures very well%单细胞激光共焦拉曼散射光谱由于受扫描条件、样品自身浓度以及样品分子组成等因素的影响,其谱线信噪比较低、荧光背景有时较明显从而导致谱线质量较差.本文主要针对活态单细胞的拉曼光谱进行谱线预处理技术研究用以提高谱线的信噪比、灵敏度及降低荧光背景干扰.首先是宇宙射线的去除,之后进行谱线的归类,这是提高谱线灵敏度的关键步骤;其次是进行滤波及样品平均提高谱线的信噪比;最后是比较谱线本底降低荧光背景对定量分析的干扰.经过上述系列处理后单细胞拉曼谱线可使一些变化小、但灵敏的谱线表现出来,使其能更好地反映细胞内分子及结构信息等的变化.
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