Goya's artwork imaging with Terahertz waves.

In this paper we use a Terahertz (THz) time-domain system to image and analyze the structure of an artwork attributed to the Spanish artist Goya painted in 1771. The THz images show features that cannot be seen with optical inspection and complement data obtained with X-ray imaging that provide evidence of its authenticity, which is validated by other independent studies. For instance, a feature with a strong resemblance with one of Goya's known signatures is seen in the THz images. In particular, this paper demonstrates the potential of THz imaging as a complementary technique along with X-ray for the verification and authentication of artwork pieces through the detection of features that remain hidden to optical inspection.

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

[2]  Nigel Glendinning,et al.  Goya and his critics , 1977 .

[3]  P. Taday,et al.  Terahertz pulsed spectroscopy and imaging in the pharmaceutical setting ‐ a review , 2007, The Journal of pharmacy and pharmacology.

[4]  G. Bastiaans,et al.  Absorption coefficients of selected explosives and related compounds in the range of 0.1-2.8 THz. , 2007, Optics express.

[5]  Rubén Picó,et al.  Application of Ultrasound Phase-Shift Analysis to Authenticate Wooden Panel Paintings , 2014, Sensors.

[6]  Michel Baron,et al.  Development of a Process Analytical Technology (PAT) for in-line monitoring of film thickness and mass of coating materials during a pan coating operation. , 2011, European journal of pharmaceutical sciences : official journal of the European Federation for Pharmaceutical Sciences.

[7]  P. Taday,et al.  Using terahertz pulsed spectroscopy to quantify pharmaceutical polymorphism and crystallinity. , 2005, Journal of pharmaceutical sciences.

[8]  M. Menu,et al.  Papyrus imaging with terahertz time domain spectroscopy , 2010 .

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

[10]  I. Hosako,et al.  THz-ARTE: non-invasive terahertz diagnostics for art conservation , 2008, 2008 33rd International Conference on Infrared, Millimeter and Terahertz Waves.

[11]  S. Hunsche,et al.  THz-imaging: a new method for density mapping of wood , 1998, Wood Science and Technology.

[12]  S. J. Park,et al.  Detection of microorganisms using terahertz metamaterials , 2014, Scientific Reports.

[13]  M. Picollo,et al.  Terahertz spectroscopy applied to the analysis of artists’ materials , 2010 .

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

[15]  M. Tani,et al.  Noninvasive Inspection of C-4 Explosive in Mails by Terahertz Time-Domain Spectroscopy , 2004 .

[16]  Kodo Kawase,et al.  Mail screening applications of terahertz radiation , 2010 .

[17]  K. Fukunaga,et al.  A Survey of Terahertz Applications in Cultural Heritage Conservation Science , 2011, IEEE Transactions on Terahertz Science and Technology.

[18]  P. Taday,et al.  Nondestructive analysis of tablet coating thicknesses using terahertz pulsed imaging. , 2005, Journal of pharmaceutical sciences.