Spectroscopy and terahertz imaging for sigillography applications

This study focuses on the seals of validation, sealing written documents, used in the Western Middle Ages, especially wax seals. We use THz spectroscopy and imaging for non-destructive evaluation of natural materials within those seals. Using a time domain THz spectroscopy and imaging system, THz transmission images are generated in the 0.1-3 THz range and demonstrate that the spectral properties of these materials allow to see across and under a thick layer of old wax.

[1]  P. Mounaix,et al.  Far-infrared optical constants of CO2 near the critical point measured by terahertz spectroscopy , 2003 .

[2]  Yan Zhang,et al.  Terahertz absorbance spectrum fitting method for quantitative detection of concealed contraband , 2007 .

[3]  P. Taday,et al.  Detection and identification of explosives using terahertz pulsed spectroscopic imaging , 2005 .

[4]  K. Kawase,et al.  Non-destructive terahertz imaging of illicit drugs using spectral fingerprints. , 2003, Optics express.

[5]  Zuimin Jiang,et al.  Thin HfO2 films grown on Si(100) by atomic oxygen assisted molecular beam epitaxy , 2004 .

[6]  L. Boivin,et al.  T-ray tomography. , 1997 .

[7]  M. Nuss,et al.  Imaging with terahertz waves. , 1995, Optics letters.

[8]  Patrick Mounaix,et al.  Non-invasive investigation of art paintings by terahertz imaging , 2010 .

[9]  P. Mounaix,et al.  Broadband terahertz imaging of documents written with lead pencils , 2009 .

[10]  Iwao Hosako,et al.  Terahertz spectroscopy for art conservation , 2007, IEICE Electron. Express.

[11]  Lisa M. Zurk,et al.  Terahertz Scattering from Granular Material , 2007 .

[12]  張用穎.  毫米波（Millimeter Wave）通訊技術概論 , 2014 .

[13]  B. Ferguson,et al.  T-ray computed tomography. , 2002, Optics letters.

[14]  Wojciech Knap,et al.  Plasma wave field effect transistor as a resonant detector for 1 terahertz imaging applications , 2009 .

[15]  Patrick Mounaix,et al.  Terahertz dielectric characterisation of polymethacrylimide rigid foam: the perfect sheer plate? , 2004 .

[16]  E. Brown,et al.  Millimeter-wave, terahertz, and mid-infrared transmissionthrough common clothing , 2004 .