Experimental Study of Spectral Processing Technology for Improving Detection Ability of Low-Concentration NaCl Aerosol by Filament-Induced Fluorescence Spectrum

Chenhao Zhi; Yamin Gao; Yuyan Xiang; Zhi Zhang; Binpeng Shang; Jiewei Guo; Maoqiang Xie; Mingming Liu; Nan Zhang; Lu Sun; Weiwei Liu

doi:10.3788/LOP212962

Laser & Optoelectronics Progress, Volume. 60, Issue 1, 0101001(2023)

Experimental Study of Spectral Processing Technology for Improving Detection Ability of Low-Concentration NaCl Aerosol by Filament-Induced Fluorescence Spectrum

Chenhao Zhi¹, Yamin Gao¹, Yuyan Xiang¹, Zhi Zhang², Binpeng Shang², Jiewei Guo², Maoqiang Xie^1、*, Mingming Liu^1、**, Nan Zhang², Lu Sun², and Weiwei Liu²

Author Affiliations

¹College of Software, Nankai University, Tianjin 300350, China

²Institute of Modern Optics, Nankai University, Tianjin 300350, China

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Figures & Tables(12)

Fig. 1. Schematic diagram of filament-induced fluorescence spectrum (FIFS) collection spectrum device

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Fig. 2. Photo of aerosol generator

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Fig. 3. Photo of cloud chamber

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Fig. 4. FIFS of NaCl aerosol

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Fig. 5. Spectra of single preprocessing methods. (a) SG; (b) FFT; (c) SNV; (d) MSC; (e) MF; (f) FD; (g) SD; (h) DWT

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Fig. 6. Spectra of 150 $\times$ 10^-6 NaCl before processing of SOP

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Fig. 7. Spectra of 150 $\times$ 10^-6 NaCl after processing of SOP

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Fig. 8. Fitting scatter plots of PLSR prediction value for different preprocessing methods. (a) Original, FFT, SG; (b) MSC, SD, DWT; (c) FFT-SOP, SG-FD, SG-FFT-SD; (d) MF-SG-FFT, MF-SG-FFT-DWT, MF-SG-FFT-SOP; (e) MSC-MF-SG-FFT, MSC-FFT-MF-SG, MSC-MF-SG-FFT-DWT; (f) MSC-MF-SG-FFT-SOP, SNV-SG-FFT-FD, SNV-MF-SG-FFT-DWT

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Table 1. Combinations of spectral preprocessing methods

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Table 1. Combinations of spectral preprocessing methods

No.	Preprocessing method
1	Original
2	SG
3	FFT
4	MSC
5	SD
6	DWT
7	FFT-SOP
8	SG-FD
9	SG-FFT-SD
10	MF-SG-FFT
11	MF-SG-FFT-DWT
12	MF-SG-FFT-SOP
13	MSC-MF-SG-FFT
14	MSC-FFT-MF-SG
15	MSC-MF-SG-FFT-DWT
16	MSC-MF-SG-FFT-SOP
17	SNV-SG-FFT-FD
18	SNV-MF-SG-FFT-DWT

Table 2. Peak positions and significance of peak (SOP)
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Table 2. Peak positions and significance of peak (SOP)
No. Peak position /nm SOP
1 590 0.8
2 499 0.7
3 542 0.7
4 549 0.7
5 518 0.6
6 480 0.5
7 492 0.5
8 511 0.5
9 551 0.5
10 569 0.5
11 496 0.3
12 594 0.3
13 616 0.3
14 620 0.3
15 628 0.3

Table 3. Combinations of preprocessing methods

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Table 3. Combinations of preprocessing methods

Preprocessing method	SNR	RMSE
Original	25.369	0.163
SG	37.002	0.127
FFT	38.698	0.121
MSC	26.632	0.166
SD	$-$ 11.879	0.631
DWT	2.432	0.139
FFT-SOP	42.427	0.031
SG-FD	$-$ 7.410	0.408
SG-FFT-SD	$-$ 6.677	0.453
MF-SG-FFT	38.920	0.111
MF-SG-FFT-DWT	6.946	0.169
MF-SG-FFT-SOP	41.873	0.030
MSC-MF-SG-FFT	44.180	0.110
MSC-FFT-MF-SG	44.351	0.106
MSC-MF-SG-FFT-DWT	6.889	0.172
MSC-MF-SG-FFT-SOP	46.630	0.030
SNV-SG-FFT-FD	$-$ 6.691	0.451
SNV-MF-SG-FFT-DWT	5.673	0.167

Table 4. Prediction results of PLSR models under different preprocessing methods

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Table 4. Prediction results of PLSR models under different preprocessing methods

Pretreatment method	R²	RPD	RMSEP
Original	0.540	1.474	0.259
SG	0.524	1.450	0.263
FFT	0.492	1.403	0.272
MSC	0.896	3.105	0.123
SD	0.854	2.622	0.145
DWT	0.947	4.353	0.088
FFT-SOP	0.879	2.873	0.133
SG-FD	0.843	2.520	0.151
SG-FFT-SD	0.794	2.205	0.173
MF-SG-FFT	0.466	1.369	0.279
MF-SG-FFT-DWT	0.923	3.602	0.106
MF-SG-FFT-SOP	0.936	3.963	0.096
MSC-MF-SG-FFT	0.847	2.556	0.149
MSC-FFT-MF-SG	0.847	2.558	0.149
MSC-MF-SG-FFT-DWT	0.901	3.179	0.120
MSC-MF-SG-FFT-SOP	0.955	4.712	0.081
SNV-SG-FFT-FD	0.649	1.689	0.226
SNV-MF-SG-FFT-DWT	0.821	2.363	0.161

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Chenhao Zhi, Yamin Gao, Yuyan Xiang, Zhi Zhang, Binpeng Shang, Jiewei Guo, Maoqiang Xie, Mingming Liu, Nan Zhang, Lu Sun, Weiwei Liu. Experimental Study of Spectral Processing Technology for Improving Detection Ability of Low-Concentration NaCl Aerosol by Filament-Induced Fluorescence Spectrum[J]. Laser & Optoelectronics Progress, 2023, 60(1): 0101001

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