Banknotes anti-counterfeiting system based on THz-TDS confocal imaging

Yong Ma; Yi Liu; Jincheng He; Longliang Yang; Lihao Yang; Wu Pan; Zhen Zhang; Huan Yang; Xingye Zhou; Shixiong Liang; Zhihong Feng; Jiacheng Liu; Yuhang Han; Qianwen Xu

doi:10.1117/12.2606730

24 November 2021 Banknotes anti-counterfeiting system based on THz-TDS confocal imaging

Yong Ma, Yi Liu, Jincheng He, Longliang Yang, Lihao Yang, Wu Pan, Zhen Zhang, Huan Yang, Xingye Zhou, Shixiong Liang, Zhihong Feng, Jiacheng Liu, Yuhang Han, Qianwen Xu

Author Affiliations +

Proceedings Volume 12061, AOPC 2021: Infrared Device and Infrared Technology; 120611H (2021) https://doi.org/10.1117/12.2606730
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China

Abstract

Anti-counterfeiting technologies of banknotes are essential to avoid financial fraud and maintain the stability of the socio-economic system. In recent years, the technologies used by counterfeiters have become more and more advanced, bringing great challenges to traditional methods of authenticity check. Therefore, the identification technologies of banknotes urgently need to be improved. Terahertz spectroscopy is widely used for analysis and material identification due to its properties (such as biomolecular fingerprinting spectrum, ultra-weak photon emission, non-destructive and time-resolution detection). In this paper, we apply the transmission terahertz imaging to the identification of anti-counterfeit labels of RMB. We designed and built a THz-TDS confocal imaging system, which has higher image resolution than traditional THz-TDS imaging systems. We used this system to perform terahertz imaging on anti-counterfeit labels of banknotes. The results show that our designed and built THz-TDS confocal imaging system not only provides higher image quality, but also can identify more details of the anti-counterfeit labels of banknotes.

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Yong Ma, Yi Liu, Jincheng He, Longliang Yang, Lihao Yang, Wu Pan, Zhen Zhang, Huan Yang, Xingye Zhou, Shixiong Liang, Zhihong Feng, Jiacheng Liu, Yuhang Han, and Qianwen Xu "Banknotes anti-counterfeiting system based on THz-TDS confocal imaging", Proc. SPIE 12061, AOPC 2021: Infrared Device and Infrared Technology, 120611H (24 November 2021); https://doi.org/10.1117/12.2606730

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KEYWORDS

Imaging systems

Confocal microscopy

Image resolution

Terahertz radiation

Metals

Millimeter wave imaging

Signal to noise ratio

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