Terahertz imaging has the potential to identify and decipher portions of ancient manuscripts, which may be unreadable at infrared and visible wavelengths. We use a scanning confocal terahertz microscope to scan a medieval parchment with music notes and pentagrams written with different inks. The microscope is based on a continuous-wave solid-state source at 0.3 THz, emitting in the free space with a horn antenna, and a high numerical-aperture ellipsoidal reflector. We present terahertz images with diffraction-limited lateral resolution of approximately 0.5 mm, where the different inks all give similar high contrast. Symbols written on the “verso” side of the parchment, barely glimpsed in the near-infrared photograph, leave a clear imprint in the terahertz images. Artifacts due to imperfect flatness of the parchment are also briefly discussed.

Flammini, M., Bonsi, C., Ciano, C., Giliberti, V., Pontecorvo, E., Italia, P., et al. (2017). Confocal Terahertz Imaging of Ancient Manuscripts. JOURNAL OF INFRARED, MILLIMETER, AND TERAHERTZ WAVES, 38(4), 435-442 [10.1007/s10762-016-0338-x].

Confocal Terahertz Imaging of Ancient Manuscripts

BONSI, CLAUDIA
Ultimo
;
2017

Abstract

Terahertz imaging has the potential to identify and decipher portions of ancient manuscripts, which may be unreadable at infrared and visible wavelengths. We use a scanning confocal terahertz microscope to scan a medieval parchment with music notes and pentagrams written with different inks. The microscope is based on a continuous-wave solid-state source at 0.3 THz, emitting in the free space with a horn antenna, and a high numerical-aperture ellipsoidal reflector. We present terahertz images with diffraction-limited lateral resolution of approximately 0.5 mm, where the different inks all give similar high contrast. Symbols written on the “verso” side of the parchment, barely glimpsed in the near-infrared photograph, leave a clear imprint in the terahertz images. Artifacts due to imperfect flatness of the parchment are also briefly discussed.
Articolo in rivista - Articolo scientifico
Confocal microscopy; Diffraction limit; Ink; Paper; Schottky diode detector; Terahertz
English
2017
38
4
435
442
none
Flammini, M., Bonsi, C., Ciano, C., Giliberti, V., Pontecorvo, E., Italia, P., et al. (2017). Confocal Terahertz Imaging of Ancient Manuscripts. JOURNAL OF INFRARED, MILLIMETER, AND TERAHERTZ WAVES, 38(4), 435-442 [10.1007/s10762-016-0338-x].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/152566
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