基于太赫兹技术的葛粉中苯甲酸的检测 
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Detection of Benzoic Acid in Arrowroot by Terahertz Technology
华东交通大学机电与车辆工程学院, 江西 南昌 330013
图 & 表
图 1. 太赫兹时域光谱仪结构示意图
Fig. 1. Structural diagram of terahertz time domain spectrometer
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图 2. 葛粉中苯甲酸的部分吸收系数
Fig. 2. Partial absorption coefficients of benzoic acid in arrowroot
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图 3. 葛粉中苯甲酸不同质量分数下的吸收系数
Fig. 3. Absorption coefficients of benzoic acid in arrowroot with different mass fractions
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图 4. PLS预测的苯甲酸含量的散点图
Fig. 4. Scatter plot of benzoic acid content predicted by PLS
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图 5. 均方根误差随主成分因子的变化
Fig. 5. RMSE versus principal component factor
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图 6. 苯甲酸质量分数为20%时有/无塑料包装袋的光谱
Fig. 6. Spectra with or without plastic packaging when mass fraction of benzoic acid is 20%
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图 7. PLS预测的带包装苯甲酸含量的散点图
Fig. 7. Scatter plot of benzoic acid content with plastic packaging predicted by PLS
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图 8. 有塑料包装袋样品的RMSE随主成分因子的变化
Fig. 8. RMSE of sample with plastic packaging versus principal component factor
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表 136组样品中苯甲酸质量分数
Table1. Mass fractions of benzoic acid in 36 groups of samples
| SampleNo. | Massfraction /% | SampleNo. | Massfraction /% | SampleNo. | Massfraction /% |
|---|
| 1 | 0 | 13 | 7.0 | 25 | 14.5 | | 2 | 0.5 | 14 | 7.5 | 26 | 15.0 | | 3 | 1.0 | 15 | 8.0 | 27 | 15.5 | | 4 | 1.5 | 16 | 8.5 | 28 | 16.0 | | 5 | 2.0 | 17 | 9.0 | 29 | 16.5 | | 6 | 2.5 | 18 | 10.0 | 30 | 17.0 | | 7 | 3.0 | 19 | 11.0 | 31 | 17.5 | | 8 | 3.5 | 20 | 12.0 | 32 | 18.0 | | 9 | 4.0 | 21 | 12.5 | 33 | 18.5 | | 10 | 4.5 | 22 | 13.0 | 34 | 19.0 | | 11 | 5.0 | 23 | 13.5 | 35 | 19.5 | | 12 | 6.0 | 24 | 14.0 | 36 | 20.0 |
|
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表 2基于PLS的葛粉中苯甲酸含量的模型结果
Table2. Model results of benzoic acid content in arrowroot based on PLS
| Pretreatmentmethod | Calibration set | Prediction set |
|---|
| R2 | RMSEC /% | R2 | RMSEP /% |
|---|
| Original spectrum | 0.978 | 1.121 | 0.973 | 1.356 | | MSC | 0.983 | 1.051 | 0.978 | 1.267 | | Baseline | 0.975 | 1.188 | 0.968 | 1.284 | | 1st derivative | 0.969 | 1.062 | 0.962 | 1.305 | | 2nd derivative | 0.981 | 1.050 | 0.973 | 1.269 |
|
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表 3基于PLS的有塑料包装的葛粉中苯甲酸含量的模型结果
Table3. Model results of benzoic acid content in arrowroot with plastic packaging based on PLS
| Pretreatmentmethod | Calibration set | Prediction set |
|---|
| R2 | RMSEC /% | R2 | RMSEP /% |
|---|
| Original spectrum | 0.976 | 1.135 | 0.968 | 1.799 | | MSC | 0.978 | 1.128 | 0.976 | 1.356 |
|
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刘燕德, 杜秀洋, 李斌, 胡军, 吴建, 郑艺蕾. 基于太赫兹技术的葛粉中苯甲酸的检测[J]. 激光与光电子学进展, 2019, 56(4): 041101. Yande Liu, Xiuyang Du, Bin Li, Jun Hu, Jian Wu, Yilei Zheng. Detection of Benzoic Acid in Arrowroot by Terahertz Technology[J]. Laser & Optoelectronics Progress, 2019, 56(4): 041101.
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