Abstract

In order to explore the possibility of using terahertz attenuated total reflection (THz-ATR) technology combined with chemometric methods to quantitatively analyze different concentrations of formaldehyde solutions, the THz-ATR was applied to measure the formaldehyde solution with a concentration of 0% to 10%, and the absorption coefficient and refractive index of the samples in the frequency range of 0.2 to 1.2 THz were calculated. Partial least squares (PLS) and back propagation (BP) neural network (BPNN) algorithms are used to establish the mathematical model to predict the relation between the absorption coefficient and the concentration as well as the refractive index and the concentration. Correlation coefficient $R$ and the root-mean-square error RMSE obtained from the PLS prediction model based on the refractive index are 98.99% and 0.4604, respectively, and those based on the absorption coefficient are 99.05% and 0.4464, respectively. Meanwhile, the correlation coefficient $R$ and root-mean-square error RMSE obtained from the BPNN prediction model based on the refractive index are 99.80% and 0.2407, while those based on the absorption coefficient are 99.93% and 0.1182, respectively.

© 2021 Optica Publishing Group

Terahertz spectroscopy detection of zinc citrate in flour and milk powder mixtures

Ziyu Song, Min Liao, Dongxiong Ling, Changshui Chen, and Dongshan Wei
Appl. Opt. 61(25) 7443-7448 (2022)

Detection of single-base mutation of DNA oligonucleotides with different lengths by terahertz attenuated total reflection microfluidic cell

Mingjie Tang, Mingkun Zhang, Liangping Xia, Zhongbo Yang, Shihan Yan, Huabin Wang, Dongshan Wei, Chunlei Du, and Hong-Liang Cui
Biomed. Opt. Express 11(9) 5362-5372 (2020)

Chemometrics applied quantitative analysis of iron oxide mixtures by terahertz spectroscopy

Ying Li, Tian-Yao Zhang, Zhao-Hui Zhang, Jian-Feng Yan, Xuan Zhao, Xiao-Yan Zhao, Xing-Yue Li, Xian-Hao Wu, Lu Yin, Yuan Yuan, and Jian-Mei Guo
Appl. Opt. 62(5) 1167-1174 (2023)

Dispersion effects on infrared spectra in attenuated total reflection

Rabah Belali, Jean-Marie Vigoureux, and Joseph Morvan
J. Opt. Soc. Am. B 12(12) 2377-2381 (1995)

Temperature dependent terahertz spectroscopy and imaging of orthotopic brain gliomas in mouse models

Limin Wu, Yuye Wang, Bin Liao, Lu Zhao, Kai Chen, Meilan Ge, Haibin Li, Tunan Chen, Hua Feng, Degang Xu, and Jianquan Yao
Biomed. Opt. Express 13(1) 93-104 (2022)