Research on Quality of Agricultural Products by Terahertz Spectroscopy

Fig. 4. Groundnut kernel with different degrees of mildew^[15]_. （a）Normal groundnut kernel; (b) groundnut kernel with mild mildew; (c) groundnut kernel with moderate mildew; (d) groundnut kernel with severe mildew

Download full size

Fig. 5. Experimental and theoretically calculated absorption efficient of chlorodifon and dipterex^[25]. (a) Chlorodifon; (b) dipterex

Download full size

Fig. 6. Fitted curve between predicted and actual alum contents in flour^[41]

Download full size

Fig. 7. THz absorption spectra of transgenic and non-transgenic cotton seeds at low frequency and high frequency bands^[49]. (a) 0.3?0.9 THz band; (b) 0.9?1.2 THz band

Download full size

Fig. 8. Average terahertz time-domain spectra of soybean leaves under different drought stress gradients^[58]

Download full size

Table 1. Comparison of experimental results of adulteration of potato powders^[16]
View table
Table 1. Comparison of experimental results of adulteration of potato powders^[16]
Method Root-mean-square error/% Coefficient of determination R²
PLS 2.6 0.932
LS-SVM 1.6 0.957

Table 2. Prediction results of LS-SVM model used for detecting benzoic acid content in corn flour^[45]

View table

Table 2. Prediction results of LS-SVM model used for detecting benzoic acid content in corn flour^[45]

Input data	Kernel function			R_p	RMSEP
Input data	Type	Parameter	Time/s	R_p	RMSEP
Original spectrum	Lin_kernel	γ=2.4123	0.0468	0.9850	0.0104
Original spectrum	RBF_kernael	γ=1980.3968,σ²=51.8468	0.0468	0.9958	0.0057
Moving average smoothing size 5	Lin_kernel	γ=2.7239	0.0468	0.9844	0.0106
Moving average smoothing size 5	RBF_kernael	γ=192721.9293,σ²=852.7071	0.0312	0.9917	0.0082

Tools

Get Citation

Copy Citation Text

Liu Yande, Xu Zhen, Hu Jun, Li Maopeng. Research on Quality of Agricultural Products by Terahertz Spectroscopy[J]. Laser & Optoelectronics Progress, 2021, 58(1): 100005

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites

Paper Information

Category: Reviews

Received: Apr. 8, 2020

Accepted: --

Published Online: Jan. 27, 2021

The Author Email: Liu Yande (jxliuyd@163.com)

DOI:10.3788/LOP202158.0100005

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Comparison of experimental results of adulteration of potato powders[16]

Table 1. Comparison of experimental results of adulteration of potato powders[16]

Table 2. Prediction results of LS-SVM model used for detecting benzoic acid content in corn flour[45]

Table 2. Prediction results of LS-SVM model used for detecting benzoic acid content in corn flour[45]

Table 1. Comparison of experimental results of adulteration of potato powders^[16]

Table 1. Comparison of experimental results of adulteration of potato powders^[16]

Table 2. Prediction results of LS-SVM model used for detecting benzoic acid content in corn flour^[45]

Table 2. Prediction results of LS-SVM model used for detecting benzoic acid content in corn flour^[45]