Improving Detection Accuracy of Laser-Induced Breakdown Spectroscopy for Cu Element in Pig Feed Based on Spatial Confinement

Mengqin Huang; Shujia Wu; Mingyin Yao; Zihao Liu; Chongjiu Wu; Long Xue; Muhua Liu; Jing Li

doi:10.3788/LOP213301

Laser & Optoelectronics Progress, Volume. 60, Issue 7, 0730002(2023)

Improving Detection Accuracy of Laser-Induced Breakdown Spectroscopy for Cu Element in Pig Feed Based on Spatial Confinement

Mengqin Huang¹, Shujia Wu¹, Mingyin Yao^1,2, Zihao Liu¹, Chongjiu Wu¹, Long Xue^1,2, Muhua Liu^1,2, and Jing Li^1,2、*

Author Affiliations

¹School of Engineering, Jiangxi Agricultural University, Nanchang 330045, Jiangxi, China

²Jiangxi Key Laboratory of Modern Agricultural Equipment, Nanchang 330045, Jiangxi, China

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Figures & Tables(6)

Fig. 1. Schematic diagram of CC-LIBS system

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Fig. 2. LIBS diagram from 324.301 to 328.421 nm of 60 # sample

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Fig. 3. Spectral intensity of Cu element changing with concentration under two LIBS conditions. (a) LIBS; (b) CC-LIBS

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Table 1. Actual content of Cu element in pig feed samples

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Table 1. Actual content of Cu element in pig feed samples

Sample	Reference concentration /（mg·kg^-1）	Sample	Reference concentration /（mg·kg^-1）	Sample	Reference concentration /（mg·kg^-1）	Sample	Reference concentration /（mg·kg^-1）
01#	53.9±0.06	16#	60.8±0.04	31#	133.9±0.13	46#	224.7±0.14
02#	53.9±0.05	17#	61.4±0.03	32#	133.2±0.02	47#	219.0±0.25
03#	53.6±0.06	18#	61.1±0.07	33#	133.2±0.03	48#	210.9±0.17
04#	39.2±0.13	19#	80.8±0.01	34#	153.5±0.19	49#	265.0±0.22
05#	39.2±0.07	20#	80.2±0.04	35#	153.2±0.28	50#	265.6±0.22
06#	40.2±0.11	21#	78.9±0.08	36#	153.5±0.21	51#	268.7±0.11
07#	35.2±0.07	22#	96.2±0.05	37#	172.0±0.31	52#	289.0±0.10
08#	32.7±0.08	23#	95.9±0.13	38#	173.5±0.37	53#	288.4±0.13
09#	32.0±0.07	24#	95.3±0.17	39#	174.5±0.12	54#	286.5±0.08
10#	41.1±0.02	25#	107.8±0.05	40#	185.1±0.09	55#	305.7±0.15
11#	41.1±0.02	26#	107.4±0.20	41#	183.9±0.14	56#	302.2±0.26
12#	41.4±0.04	27#	108.7±0.18	42#	182.9±0.03	57#	297.9±0.33
13#	40.1±0.05	28#	108.8±0.12	43#	167.6±0.05	58#	293.3±0.37
14#	39.8±0.03	29#	106.0±0.12	44#	168.9±0.05	59#	301.4±1.19
15#	40.1±0.05	30#	103.5±0.05	45#	167.6±0.17	60#	297.3±0.23

Table 2. Prediction results of PLS models for five pretreatment methods with and without spatial confinement
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Table 2. Prediction results of PLS models for five pretreatment methods with and without spatial confinement
Pretreatment method Without confinement With confinement
R RMSEP R RMSEP
SNV 0.9099 41.8 0.9868 16.5
MSC 0.8684 49.3 0.9881 14.4
Center 0.9515 28.4 0.9676 25.3
FD 0.9308 32.9 0.9732 24.7
SD 0.9431 30.0 0.9826 19.0

Table 3. Prediction results of Cu element in MSC pretreatment model

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Table 3. Prediction results of Cu element in MSC pretreatment model

Sample	Reference concentration /（mg·kg^-1）	Without confinement		With confinement
Sample	Reference concentration /（mg·kg^-1）	Predicted concentration /（mg·kg^-1）	Relative error /%	Predicted concentration /（mg·kg^-1）	Relative error /%
3#	35.150	$-$ 3.594	110.22	45.321	28.94
7#	40.146	27.319	31.95	50.029	24.62
11#	41.075	59.296	44.36	49.408	20.29
15#	53.907	$-$ 21.063	139.07	49.268	8.61
19#	78.937	112.957	43.10	89.777	13.73
23#	95.912	126.808	32.21	84.715	11.67
27#	107.446	163.677	52.33	122.788	14.28
31#	133.200	196.734	47.70	155.134	16.47
35#	153.535	214.088	39.44	157.989	2.90
39#	168.866	240.759	42.57	183.333	8.57
43#	182.927	206.155	12.70	161.797	11.55
47#	219.028	262.547	19.87	240.801	9.94
51#	268.743	276.095	2.74	249.887	7.02
55#	293.271	250.601	14.55	307.080	4.71
59#	302.249	222.260	26.46	289.109	4.35

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Mengqin Huang, Shujia Wu, Mingyin Yao, Zihao Liu, Chongjiu Wu, Long Xue, Muhua Liu, Jing Li. Improving Detection Accuracy of Laser-Induced Breakdown Spectroscopy for Cu Element in Pig Feed Based on Spatial Confinement[J]. Laser & Optoelectronics Progress, 2023, 60(7): 0730002

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