基于激光诱导荧光的油类污染物检测系统研究

油类污染物具有破坏海洋生态系统和间接污染大气及土壤的危害,快速、准确地检测污染物的成分及其浓度具有重要意义。由于油类污染物光谱重叠严重,因此难以通过传统荧光分析准确加以区分。本文基于激光诱导荧光技术,以氙灯作为激发光设计荧光光谱检测系统,并对0#柴油、92#汽油和煤油进行扫描和检测,从而获得激发/发射光谱以及最佳激发/发射波长。并对该系统的软件算法部分进行改进,运用Savitzky-Golay卷积平滑直接获得更加精确的激发/发射光谱,更能全面、准确地反映油类物质的荧光特性信息。并与传统的荧光光谱仪得到的光谱图进行对比,经实验验证激光诱导荧光技术的荧光光谱检测系统的有效性,对油类污染物的荧光光谱信号的检测具有更高的灵敏度。

Research on Oil Contaminant Detection System Based on Laser Induced Fluorescence

Oil pollutants have the danger of destroying marine ecosystems and indirectly polluting the atmosphere and soil.It is of great significance to quickly and accurately detect the components and concentrations of pollutants.Due to the serious overlap of their spectra,it is difficult to distinguish them accurately by traditional fluorescence analysis.Based on laser-induced fluorescence technology,a fluorescent spectrum detection system was designed with xenon lamp as excitation light,and 0#diesel,92#gasoline and kerosene were scanned and detected to obtain excitation/emission spectrum and optimal excitation/emission wavelength.The software algorithm part of the system is improved,and the Savitzky-Golay convolution smoothing is added to directly obtain a more accurate excitation/emission spectrum,which can more comprehensively and accurately reflect the fluorescence characteristic information of the substance.Compared with the spectrum obtained by the traditional fluorescence spectrometer,the experimental results verify the effectiveness of the fluorescence-induced fluorescence detection system of laser-induced fluorescence technology,and have higher sensitivity for the detection of fluorescence spectral signals of oil pollutants.