设计水中油类污染物检测仪，采用脉冲氙灯作为光源，选择阶跃型多模纯石英光纤对激发光和发射光进行传输。采用非对称Czemy‐T urner光路的高精度光栅单色器。应用该装置测定柴油、汽油和煤油的荧光光谱，0＃柴油、97＃汽油和煤油的最佳激发波长／发射波长分别为：290／330，270／300和280／330 nm。检出限：柴油（0.025 mg · L －1）、汽油（0.042 mg · L －1）和煤油（0.054 mg · L －1）。相对误差：柴油（2.55％），汽油（2.06％）和煤油（1.71％），实验表明所设计的检测仪具有较高的测量精度。配置不同浓度的柴油、汽油和煤油的混合溶液，测量其三维荧光光谱，采用自加权交替三线性分解算法对光谱数据进行分解，预测浓度及回收率均表明自加权交替三线性分解算法对混合油类物质有较高的分辨能力。%The oil pollutants detector is designed in this paper .The pulse xenon lamp is used as light source ;the step type multi‐mode pure silica fiber is chosen to transmit the excitation and emission light .The asymmetric Czemy‐Turner light path of high precision grating monochromator is adopted .The detector is applied to determine the fluorescence spectrum of diesel ,gasoline and kerosene .The optimal excitation /emission wavelengths are :290/330 nm (diesel) ,270/300 nm (gasoline) and 280/330 nm (kerosene) .The detection limits are :diesel (0.025 mg · L -1 ) ,gasoline (0.042 mg · L -1 ) and kerosene(0.054 mg · L -1 ) . The relative errors are :diesel(2.55% ) ,gasoline(2.06% ) and kerosene(1.71% ) .Experiment results show that the designed detector has high accuracy of measurement .The different concentration of diesel ,gasoline and kerosene mixed solution is con‐figured ,and three dimensional fluorescence spectra being measured . The self‐weighted alternating trilinear decomposition is adopted to decompose the spectrum data .The predicted concentration and recovery rate show that self‐weighted alternating trilinear decomposition has high resolution for mixed oil substance .
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