激光诱导击穿光谱结合竞争自适应重加权采样算法对猪饲料中铜元素的定量分析 
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Quantitative Analysis of Copper Element in Pig Feed Using Laser Induced Breakdown Spectroscopy Combined with CARS Algorithm
1 江西农业大学工学院, 江西 南昌 330045
2 江西省现代农业装备重点实验室, 江西 南昌 330045
3 江西省果蔬采后处理关键技术与质量安全协同创新中心, 江西 南昌 330045
图 & 表
图 1. 激光诱导击穿光谱系统示意图
Fig. 1. Schematic of LIBS system
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图 2. 铜质量分数为4.2459×10-4的猪饲料样品在322~329 nm波段内的激光诱导击穿光谱图
Fig. 2. LIBS spectrum of pig feed samples with copper mass fraction of 4.2459×10-4 in 322-329 nm band
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图 3. 猪饲料的CARS变量优选图。(a)波长数量的变化趋势图;(b) RMSECV的变化趋势图;(c)波长变量回归系数的变化趋势图
Fig. 3. CARS variable preference diagrams of pig feed. (a) Trend chart of wavelength number; (b) trend chart of RMSECV; (c) trend chart of wavelength variable regression coefficient
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图 4. 全光谱-PLS模型预测结果。(a)建模集;(b)预测集
Fig. 4. Predicted results of all optical spectrum-PLS model. (a) Modeling set; (b) prediction set
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图 5. CARS-PLS模型预测结果。(a)建模集;(b)预测集
Fig. 5. Predicted results of CARS-PLS model. (a) Modeling set; (b) prediction set
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表 1猪饲料样品Cu元素的真实含量
Table1. True content of copper element in pig feed samples
| Sample | Mass fraction /10-6 |
|---|
| 1 | 8.61 | | 2 | 28.97 | | 3 | 38.96 | | 4 | 85.24 | | 5 | 89.15 | | 6 | 153.00 | | 7 | 167.72 | | 8 | 173.29 | | 9 | 192.45 | | 10 | 202.22 | | 11 | 206.13 | | 12 | 220.03 | | 13 | 255.55 | | 14 | 305.30 | | 15 | 359.27 | | 16 | 368.75 | | 17 | 424.59 | | 18 | 433.53 | | 19 | 477.04 |
|
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表 2全光谱及CARS变量选择方法的PLS交叉验证建模结果
Table2. Modeling results of all optical spectrum-PLS model and CARS-PLS model
| Modelingmethod | Variablenumber | Modeling set | Prediction set |
|---|
| R2 | RMSECV | R2 | Average relative error /% |
|---|
| All optical spectrum-PLS | 2048 | 0.9676 | 24.51 | 0.9533 | 10.86 | | CARS-PLS | 22 | 0.978 | 19.25 | 0.9932 | 5.59 |
|
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表 3预测集PLS模型饲料样品中Cu元素的预测含量与真实含量
Table3. Predicted content and true content of Cu element in pig feed samples in prediction set PLS model
| Sample | Truemassfraction /-6 | Predicted massfraction /10-6 | Averagerelativeerror /% |
|---|
| 1 | 38.960 | 44.80 | 14.87 | | 2 | 89.150 | 88.52 | 0.54 | | 3 | 153.000 | 138.93 | 9.19 | | 4 | 173.290 | 153.91 | 11.03 | | 5 | 192.450 | 178.57 | 7.00 | | 6 | 220.037 | 231.04 | 5.02 | | 7 | 256.550 | 240.00 | 6.25 | | 8 | 368.750 | 367.30 | 0.46 | | 9 | 305.300 | 296.66 | 2.73 | | 10 | 424.590 | 408.90 | 3.79 | | 11 | 433.520 | 436.73 | 0.63 |
|
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刘珊珊, 张俊, 林思寒, 刘木华, 黎静, 潘作栋. 激光诱导击穿光谱结合竞争自适应重加权采样算法对猪饲料中铜元素的定量分析[J]. 激光与光电子学进展, 2018, 55(2): 023001. Shanshan Liu, Jun Zhang, Sihan Lin, Muhua Liu, Jing Li, Zuodong Pan. Quantitative Analysis of Copper Element in Pig Feed Using Laser Induced Breakdown Spectroscopy Combined with CARS Algorithm[J]. Laser & Optoelectronics Progress, 2018, 55(2): 023001.
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