激光与光电子学进展, 2019, 56 (23): 233002, 网络出版: 2019-11-27 复制并引用该论文  本文已被引 3 次  被引通知

图 & 表

图 1. 甲醇汽油中甲醇含量的中红外检测模型的流程图

Fig. 1. Flow chart of mid-infrared detection model for determining methanol content of methanol gasoline

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图 2. 汽油和无水甲醇样品的原始中红外光谱。(a)汽油中红外光谱;(b)无水甲醇中红外光谱

Fig. 2. Original mid-infrared spectra of gasoline and absolute methanol. (a) Mid-infrared spectrum of gasoline; (b) mid-infrared spectrum of absolute methanol

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图 3. 不同甲醇体积分数的甲醇汽油的原始中红外光谱图

Fig. 3. Original mid-infrared spectra of methanol gasoline with different methanol volume fractions

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图 4. 采用UVE方法筛选得到的波段。(a)在全谱范围内进行波段选择;(b)在全谱范围内挑选的波段点

Fig. 4. Band selected by UVE method. (a) Band selection in full spectrum; (b) band points selected in full spectrum

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图 5. 基于CARS算法的波长变量筛选过程。(a)变量个数与采样次数的关系;(b) RMSECV值与采样次数的关系;(c)回归系数与采样次数的关系

Fig. 5. Wavelength variable screening based on CARS algorithm. (a) Number of variables versus sampling times; (b) RMSECV value versus sampling times; (c) regression coefficient versus sampling times

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图 6. 全谱范围内采用CARS方法挑选的波段点

Fig. 6. Band points selected by CARS method within full spectrum

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图 7. 每个波长点被“入选”的频次

Fig. 7. Frequency of each wavelength being selected

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图 8. RMSECV值随选取变量数的变化的趋势

Fig. 8. RMSECV varying with number of variables

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图 9. CARS-PLS预测甲醇汽油中甲醇含量的散点图。(a)建模集;(b)预测集

Fig. 9. Scatter plots of methanol content in methanol gasoline predicted by CARS-PLS model. (a) Calibration set; (b) prediction set

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表 1建模集和预测集样品中甲醇体积分数分布

Table1. Methanol volume fractions of samples in calibration and prediction sets

Data set N Minimum /% Maximum /% Mean /% RSD /% Total 120 0.60 18.60 9.41 5.37 Calibration 90 0.60 18.60 9.43 5.25 Prediction 30 0.60 18.60 9.33 5.45

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表 2甲醇汽油的中红外光谱校正处理PLS建模效果

Table2. Calibration effect of PLS corrected by middle infrared spectra of methanol gasoline

Pretreatmentmethod PC Rc RMSEC Rp RMSEP Original 9 0.981 1.029 0.933 1.925 S-G 13 0.997 0.375 0.944 1.772 MSC 10 0.996 0.450 0.940 1.843 SNV 3 0.962 1.440 0.873 2.871

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表 3不同波长筛选方法结合PLS模型的建模效果对比

Table3. Comparison of calibration effects of different wavelength screening methods combined with PLS method

Method Number of wavelengths PC Rc RMSEC Rp RMSEP PLS 1557 13 0.997 0.375 0.944 1.772 UVE-PLS 135 10 0.972 1.232 0.948 1.777 CARS-PLS 118 9 0.994 0.563 0.978 1.177 GA-PLS 130 11 0.983 0.994 0.956 1.527

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胡军, 刘燕德, 欧阳爱国, 刘洪量. 基于CARS波段筛选的甲醇汽油中甲醇含量中红外光谱检测[J]. 激光与光电子学进展, 2019, 56(23): 233002. Jun Hu, Yande Liu, Aiguo Ouyang, Hongliang Liu. Mid-Infrared Spectroscopy Detection of Methanol Content in Methanol Gasoline Based on CARS Band Screening[J]. Laser & Optoelectronics Progress, 2019, 56(23): 233002.