Detection and evaluation of security features embedded in paper using spectral-domain optical coherence tomography |
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Authors: | Kazuo Fujiwara and Osamu Matoba |
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Institution: | (1) DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, P.O. Box 49, 4000 Roskilde, Denmark;(2) Department of Ophthalmology, Glostrup Hospital, Nordre Ringvej 57, 2600 Glostrup, Denmark;(3) Department of Dermatology, Gentofte Hospital, Niels Andersens Vej 65, 2900 Hellerup, Denmark;; |
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Abstract: | We propose a new method for authenticating valuable paper sheets such as gift coupons, tickets, and cheques with the use of
optical coherence tomography (OCT). This method is based on the detection and evaluation of cross-sectional structural characteristics
of valuable paper sheets provided with security features. Commonly used as a security feature is a security thread, which
is embedded in such paper sheets. In this paper, the nondestructive detection of the embedded security thread is demonstrated
using spectral-domain OCT. The results showed that the security thread was clearly visualized in the OCT image despite the
highly scattering nature of papers. |
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Keywords: | |
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