Abstract-Application of terahertz spectroscopy and chemometrics for discrimination of transgenic camellia oil

Jianjun Liu, Lanlan Fan, Yuanming Liu, Lili Mao, Jianquan Kan,

PLS-WLDA, an alternative method, is performed on terahertz spectra data. The identification result of PLS-WLDA of terahertz spectra using different preprocessing type (raw, offset and derivative), it is possible to correctly identify 97% of all samples set. Compared with the SPA-WLDA, PLS-WLDA has the better discrimination performance. However, in the aspect of robustness, SPA–WLDA is better than PLS-WLDA.

https://www.sciencedirect.com/science/article/pii/S1386142518307753

Discrimination of transgenic edible oil has become the focus of attention in the field of food safety. In this paper, we propose a method for discrimination of transgenic edible oils by using terahertz spectroscopy combine with weighted linear discriminant analysis (WLDA). To evaluate the lustiness of the model, we employ successive projection arithmetic (SPA) and partial least squares (PLS) to verify the discrimination performance through variable selection. The results demonstrate that the SPA-WLDA model has higher classification accuracy than PLS-WLDA. In conclusion, terahertz spectroscopy is coupled with chemometrics is an effective method for discriminating various types of transgenic edible oils.

Abstract-Absorber: a novel terahertz sensor in the application of substance identification

·       Jianjun Liu , Lanlan Fa, Jinfeng Ku, Lili Mao

    http://link.springer.com/article/10.1007/s11082-015-0361-5?no-access=true

h

Different to traditional identification methods, a novel method that using terahertz absorber to identify waste oil and edible oil is proposed in this paper. Terahertz absorber is a sensitive metamaterials sensor which be characteristic of low and frequency in the terahertz frequency band. When the waste oil or edible oil is added to the absorber void, terahertz electromagnetic response of absorber is moved, and the redshift phenomenon of response peak is produced. Comparison of different levels of redshift, we can distinguish waste oil and edible oil clearly. The experimental data and results show that the proposed method provides a novel detection method for different substance by using metamaterials sensor in terahertz band.