Rapid Nondestructive Grading Detection of Maize Seed Vigor Using TDLAS Technique

Jia Liangquan; Qi Hengnian; Hu Wenjun; Zhao Guangwu; Kan Ruifeng; Gao Lu; Zheng Wen; Xu Qin

doi:10.3788/CJL201946.0911002

Chinese Journal of Lasers, Volume. 46, Issue 9, 911002(2019)

Rapid Nondestructive Grading Detection of Maize Seed Vigor Using TDLAS Technique

Jia Liangquan¹, Qi Hengnian¹, Hu Wenjun¹, Zhao Guangwu², Kan Ruifeng^3、*, Gao Lu¹, Zheng Wen², and Xu Qin¹

Author Affiliations

¹School of Information Engineering, Huzhou University, Huzhou, Zhejiang 313000, China

²School of Agriculture and Food Science, Zhejiang A & F University, Hangzhou, Zhejiang 311300, China

³State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Science, Changchun, Jilin 130033, China

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Figures & Tables(12)

Fig. 1. Simulated absorption spectrum of CO2 near 2004 nm band

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Fig. 2. Structural diagram of seed respiratory CO2 concentration detection pool based on multi-reflection pool

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Fig. 3. Physical map of seed respiratory pool based on multi-reflection pool structure

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Fig. 4. Experimental system diagram of wavelength modulated TDLAS

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Fig. 5. Flow chart of seed vigor detection processing based on TDLAS technology

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Fig. 6. Structural block diagram of second harmonic signal demodulation algorithm based on orthogonal vector

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Fig. 7. Absorption spectral signals of two absorption peaks

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Fig. 8. Correction diagram of temperature change

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Fig. 9. Respiration curves of sweet maize seeds in different harvests

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Table 1. Signal-to-noise ratios obtained with different noise reduction methods at different scales

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Table 1. Signal-to-noise ratios obtained with different noise reduction methods at different scales

Noise reduction method	SNR /dB
Noise reduction method	(j=4)	(j=5)	(j=6)
Forced noise reduction	64.22	68.36	67.54
Default threshold denoising	59.31	59.01	58.83
Given threshold denoising	63.38	64.33	63.91
Hard threshold denoising	57.73	58.27	57.89
Soft threshold denoising	62.68	64.03	62.88

Table 2. Seed vigor index of sweet maize in different harvests
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Table 2. Seed vigor index of sweet maize in different harvests
Index Value
30 d 40 d 50 d
Vigor index 14.09 62.12 36.89
Vigor grade Low High Medium

Table 3. Relationship between respiratory intensity and vigor index of seed

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Table 3. Relationship between respiratory intensity and vigor index of seed

Parameter	Value
Parameter	1 h	2 h	3 h	4 h	5 h	6 h	7 h	8 h
Correlation coefficient	0.004	0.678	0.994	0.963	0.954	0.953	0.945	0.937
Degree of correlation	Uncorrelated	Mediumcorrelation	Significantcorrelated	Significantcorrelated	Significantcorrelated	Significantcorrelated	Highlycorrelated	Highlycorrelated

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Jia Liangquan, Qi Hengnian, Hu Wenjun, Zhao Guangwu, Kan Ruifeng, Gao Lu, Zheng Wen, Xu Qin. Rapid Nondestructive Grading Detection of Maize Seed Vigor Using TDLAS Technique[J]. Chinese Journal of Lasers, 2019, 46(9): 911002

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