【摘要】：針對熒光峰值法濃度測量中最佳激發(fā)和發(fā)射波長的選擇問題,提出基于三維熒光光譜的多峰線性回歸參數(shù)比較法。以市售93號和97號汽油為例,首先利用FS920型穩(wěn)態(tài)熒光光譜儀掃描純水和純油品的三維熒光光譜,確定特征熒光峰峰位和強(qiáng)度;其次按不同體積比分別配置7種濃度的油水混合液樣品,提取不同樣品的熒光峰峰位、強(qiáng)度等特征參量,發(fā)現(xiàn)濃度對熒光峰特征參量有較大干擾;然后用排除法確定了93號和97號油水混合液樣品分別有23個(gè)和22個(gè)特征峰;最后采用最小二乘法對每個(gè)峰的強(qiáng)度與濃度作線性回歸,通過對校正決定系數(shù)、F值、靈敏度和截距等參數(shù)的比較得出,93號和97號油水混合液的最佳激發(fā)/發(fā)射波長分別為275/302 nm和285/322 nm。實(shí)驗(yàn)結(jié)果表明,根據(jù)最佳峰校正模型,93號和97號汽油濃度測量的絕對誤差分別為0.006‰、0.007‰,比傳統(tǒng)的最強(qiáng)峰校正模型精度高1個(gè)數(shù)量級。
[Abstract]:Aiming at the selection of optimal excitation and emission wavelengths in the concentration measurement of fluorescence peak method, a multi-peak linear regression parameter comparison method based on 3D fluorescence spectrum is proposed. Taking gasoline No. 93 and gasoline No. 97 on the market as an example, the peak position and intensity of characteristic fluorescence peak were determined by scanning the three-dimensional fluorescence spectrum of pure water and pure oil by FS920 steady-state fluorescence spectrometer. Secondly, according to the different volume ratio, 7 kinds of oil-water mixture samples were prepared, the fluorescence peak position and intensity of different samples were extracted, and it was found that the concentration had great interference on the characteristic parameters of fluorescence peak. Then, 23 and 22 characteristic peaks of 93 and 97 oil-water mixed liquid samples were determined by the exclusion method, and the intensity and concentration of each peak were regressed by the least square method. The comparison of sensitivity and intercept shows that the optimum excitation / emission wavelengths of 93 and 97 oil-water mixtures are 275 / 302 nm and 285 / 322 nm., respectively. The experimental results show that the absolute error of gasoline concentration measurement of 93% and 97% is 0.006 鈥，

本文編號：2210404