Application of continuous-wave THz imaging in banknote discrimination
When THz light propagates through a banknote of RMB,which is transparent for THz radiation,the transmitted THz radiation carries signals of security features. In this letter,experimental researches on banknote discrimination by continuous-wave THz imaging are demonstrated by using of an opticallypumped THz laser (OPTL,Sifir-50,Coherent) and a pyroelectric camera (PyrocamIII). Real-time THz images of water-mark and security thread are achieved and comparison of real and fake security features is shown. THz images of genuine notes are clear and stable,while that of forged notes are confused and random. Results show that the authenticity of the tested banknote can be reliably determined by comparing its THz imaging with that of genuine banknotes. This research is only the first step in demonstrating the feasibility of banknote discrimination by THz imaging,however,THz technology provides a novel method of banknote discrimination.
Terahertz banknote discrimination CW THz imaging
Jun Yang Xiao-jing Gong Yan-dong Zhang Fei Gao Guang-zhi Feng Wen-quan Liu Lei Jin
Institutes of Biomedical and Health Engineering,Shenzhen Institutes of Advanced Technology,Chinese Academy of Sciences,Shenzhen,Guangdong,P. R. China,518055 Key Laboratory for Biomedical Informatics and Health Engineering,CAS,Shenzhen,518055,China
国际会议
西安
英文
178-181
2011-12-23（万方平台首次上网日期，不代表论文的发表时间）