Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference
  • (Optica Publishing Group, 2015),
  • paper CC_P_6

Terahertz Waves for Ancient Manuscripts Conservation

Not Accessible

Your library or personal account may give you access

Abstract

Paper has been widely used as convenient vehicle for the acquisition, storage and dissemination of human knowledge. For centuries, a growing number of cellulose-based manuscript and printed book have been accumulating in archives, libraries and museums. The progressive transformation leading to an increased fragility and yellowing -commonly observed in the ancient paper-based artefacts- have been connected to the fragmentation of cellulose polymers (depolymerisation) and their oxidation [1,2]. The establishment and improvements of models of preservation for often-irreplaceable items is in many ways connected to the development of techniques (possibly in-situ and standoff, in light of the practical constraints in moving and handling some of those items), to assess in non-destructive ways the state of degradation of cellulose compounds [3]. Our investigation demonstrates that microscopy techniques based on Terahertz-Time Domain Spectroscopy (TDS) [4] are competitive with state-of-the-art solutions and have the potential to outperform them. Resonances in the THz region are dominated by collective atomic vibrational modes (Fig. 1). These modes are directly correlated to cellulose crystallinity and can give information on the state of the depolymerisation of cellulose polymers. In addition TDS provides access to the average optical density spectrum, information in general not available in other frequency ranges. The investigation approach undertaken here highlights specific spectral markers of degradation with remarkably high contrast for practical sample thicknesses.

© 2015 IEEE

PDF Article
More Like This
Role of human sweat ducts in interaction of terahertz wave with human skin

Saroj R. Tripathi, Eisuke Miyata, and Kodo Kawase
15p_2E_4 JSAP-OSA Joint Symposia (JSAP) 2015

Signal Windowing in Terahertz Time-Domain Spectroscopy

Dimitar G. Valchev and Saroj R. Tripathi
15p_2E_5 JSAP-OSA Joint Symposia (JSAP) 2015

Terahertz Surface Wave Modulation in a Dielectric Slab Metasurface

N. Karl, H.-T. Chen, A. J. Taylor, I. Brener, A. Benz, J. Reno, R. Mendis, and D. M. Mittleman
STu1H.6 CLEO: Science and Innovations (CLEO:S&I) 2015

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved