Broadband terahertz imaging of documents written with lead pencils |
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| Authors: | E. Abraham,A. Younus,A. El Fatimy,J.C. Delagnes,E. Ngué ma,P. Mounaix |
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| Affiliation: | Centre de Physique Moléculaire Optique et Hertzienne, Université de Bordeaux 1, UMR 5798, 351 Cours de la Libération, 33405 Talence Cedex, France |
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| Abstract: | Far infrared transmission spectra of several graphite pencil leads on paper have been measured up to 2 THz using time-domain spectroscopy. The observation of the gradual absorption depending on the graphite proportion has been assessed for different pencils from hard to soft black-marking graphite leads. The resulting graphite transmittance is used to perform two-dimensional transmission terahertz imaging of written documents. |
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