Study on identification methods in the detection of transgenic material based on terahertz time domain spectroscopy

Zhang, Wentao; Nie, Junyang; Tu, Shan

doi:10.1007/s11082-015-0228-9

Cited by 10 publications

(3 citation statements)

References 12 publications

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“…Ultrafast femtosecond laser generates laser pulses at around 800nm of 100fs duration at a central wavelength with a repetition frequency of 80 MHz. The laser beam is divided into a pump beam and a probe beam by a beam splitter (CBS) [12]. The schematic diagram of the THz-TDS system is shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

A Terahertz Spectroscopy Nondestructive Identification Method for Rubber Based on CS-SVM

Yin

Wang

et al. 2018

Advances in Condensed Matter Physics

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A method is proposed for rubber identification based on terahertz time-domain spectroscopy (THz-TDS) and support vector machine (SVM). In order to improve the accuracy, the cuckoo search algorithm (CS) is used to optimize the penalty factor C and kernel function parameter g of SVM. The SVM model optimized by the cuckoo search algorithm is abbreviated as CS-SVM. Principal component analysis (PCA) is applied to decrease the dimension of the spectral data. The top ten principal component factors, whose accumulated variance contribution rate reaches 93.93%, are extracted from the original spectra data and then are applied to CS-SVM. The identification rate of testing sets for CS-SVM is 100%, which is significantly higher than 96.67% identification rate of testing sets for PSO-SVM and Grid search. Experimental results show that CS-SVM can accomplish nondestructive identification for different rubber. This method lays a theoretical foundation for the application of terahertz spectroscopy in rubber classification and identification.

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Section: Methodsmentioning

confidence: 99%

A Terahertz Spectroscopy Nondestructive Identification Method for Rubber Based on CS-SVM

Yin

Wang

et al. 2018

Advances in Condensed Matter Physics

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“…β-胡萝卜素和叶绿素的吸收峰基本是互补的, 这样就拓宽了光能自养生物的光能利用范围 [2] . 叶绿素b和β-胡萝卜素吸收的光能传给叶绿素a, 所有捕光色素吸收的光能最终都传给一对存在于光系统Ⅱ (photosystem Ⅱ, PSⅡ)反应中心的特殊叶绿素a分子, 然后用来驱动光化学反应的进行 [3,4] . 够漂白叶绿素 [5] .…”

Section: 和叶绿素一样 β-胡萝卜素也含有一系列的共轭双键unclassified

光照引起的叶绿素<bold>a</bold>和<bold>β</bold><bold>-</bold>胡萝卜素在太赫兹和<?Pub _newline?>可见区的光谱变化研究

张帅¹,

曲元刚²,

廉玉姬³

et al. 2017

Sci. Sin.-Vitae

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“…On the other hand, the THz wave is an electromagnetic wave in the transition band between millimeter wave and infrared. The wave number range is 3.33–333 cm −1 , and the frequency range is 0.1–10 THz [ 12 , 13 ]. Although the THz wave is the least known and developed wave so far, it has the unique advantages of low energy, strong penetrability, and good transient and high resolution in optical detection.…”

Section: Introductionmentioning

confidence: 99%

Application of IRI Visualization to Terahertz Vibrational Spectroscopy of Hydroxybenzoic Acid Isomers

Tu,

Zhang,

Tang

et al. 2023

IJMS

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The characteristic absorption spectra of three positional isomers of hydroxybenzoic acid are measured using a terahertz time-domain spectroscopy system (THz-TDS) in the 0.6–2.0 THz region at room temperature. Significant differences in their terahertz spectra are discovered, which indicates that THz-TDS is an effective means to identify positional isomers. In order to simulate their spectra, the seven molecular clusters of 2-, 3-, and 4-hydroxybenzoic acid (2-, 3-, and 4-HA) are calculated using the DFT-D3 method. Additionally, the potential energy distribution (PED) method is used to analyze their vibration modes. The analysis indicates that the vibration modes of 2-HA are mainly out-of-plane angle bending and bond angle bend in plane. The vibration modes of 3-HA are mainly bond length stretch and dihedral angle torsion. The vibration modes of 4-HA are mainly bond angle bend in plane and dihedral angle torsion. Interaction region indicator (IRI) analysis is used to visualize the location and type of intermolecular interactions in 2-, 3-, and 4-HA crystals. The results show that the weak interaction type of 2-, 3-, and 4-HA is dominated by van der Waals (vdW) interaction. Therefore, we can confirm that terahertz spectroscopy detection technology can be used as an effective means to identify structural isomers and detect the intermolecular interactions in these crystals. In addition, it can explain the absorption mechanism of terahertz waves interacting with matter.

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Study on identification methods in the detection of transgenic material based on terahertz time domain spectroscopy

Cited by 10 publications

References 12 publications

A Terahertz Spectroscopy Nondestructive Identification Method for Rubber Based on CS-SVM

A Terahertz Spectroscopy Nondestructive Identification Method for Rubber Based on CS-SVM

光照引起的叶绿素<bold>a</bold>和<bold>β</bold><bold>-</bold>胡萝卜素在太赫兹和<?Pub _newline?>可见区的光谱变化研究

Application of IRI Visualization to Terahertz Vibrational Spectroscopy of Hydroxybenzoic Acid Isomers

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Study on identification methods in the detection of transgenic material based on terahertz time domain spectroscopy

Cited by 10 publications

References 12 publications

A Terahertz Spectroscopy Nondestructive Identification Method for Rubber Based on CS-SVM

A Terahertz Spectroscopy Nondestructive Identification Method for Rubber Based on CS-SVM

光照引起的叶绿素&lt;bold&gt;a&lt;/bold&gt;和&lt;bold&gt;&beta;&lt;/bold&gt;&lt;bold&gt;-&lt;/bold&gt;胡萝卜素在太赫兹和&lt;?Pub _newline?&gt;可见区的光谱变化研究

Application of IRI Visualization to Terahertz Vibrational Spectroscopy of Hydroxybenzoic Acid Isomers

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Product

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光照引起的叶绿素<bold>a</bold>和<bold>β</bold><bold>-</bold>胡萝卜素在太赫兹和<?Pub _newline?>可见区的光谱变化研究