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SUMMARY:Terahertz Time-Domain Spectroscopy for artworks analysis
DTSTART;VALUE=DATE-TIME:20220706T135000Z
DTEND;VALUE=DATE-TIME:20220706T140500Z
DTSTAMP;VALUE=DATE-TIME:20260414T150326Z
UID:indico-contribution-747@events.ncbj.gov.pl
DESCRIPTION:Speakers: Ewelina Karpierz-Marczewska (CENTERA Laboratories\, 
 Institute of High Pressure Physics PAS)\, Kamil Stelmaszczyk (CENTERA Labo
 ratories\, Institute of High Pressure Physics PAS)\nIn recent years\, tera
 hertz (THz) techniques have been used in many fields of applications\, mos
 t of all in space\, telecommunication and security industry. However\, the
  number of projects connecting THz technologies with Science and Culture i
 s constantly increasing and the conservation and restoration of art\, e.g.
  paintings or sculptures\, belongs to the most evolving areas in this doma
 in. \nThe conventional spectroscopic and imaging techniques for the analys
 is of art pieces comprise: X-ray\, Ultraviolet (UV)\, Infrared (IR) and la
 ser spectroscopy\, but even if well established\, they may have negative i
 mpact on the objects under analysis due to high energies of photons. Only 
 IR reflectography is considered as safe method\, but in many cases it is s
 imply not sufficient. THz imaging is a non-invasive and safe technique whi
 ch extends spectral bands of X-ray and IR spectroscopies to lower and less
  invasive photon energies. Several years ago\, it was proposed for the stu
 dy of artworks and research in the Uffizi Gallery in Florence and recent d
 evelopments in THz technology\, in particular time domain techniques\, ena
 ble easier and more effective usage of THz radiation in the field of art c
 onservation.\nThe best established and most promising THz time domain tech
 nique is known as Terahertz Time Domain Spectroscopy (THz-TDS). It can be 
 used to characterize and identify various materials in the THz wavelength 
 range\, basing on the intensity of the wave passing through the sample or 
 the wave reflected from it. In addition\, the measurement of the phase of 
 the THz wave makes it possible to study the parameters characterizing macr
 oscopic electromagnetic properties of materials\, as extension to typical 
 molecular absorption spectra.\nInspired by successful applications of THz 
 techniques in the Uffizi Gallery in Florence\, the Louvre in Paris or muse
 ums in Milan\, we decided at CENTERA to prepare THz-TDS experiments\, whic
 h  provide new information about the internal physical structure of painti
 ngs or frescos such as canvases\, paper and even dry plaster. THz waves ha
 ve good penetration depths in all these materials (~1 cm) and with broad s
 pectral bandwidth of ps THz pulses (0.1 - 10 THz)\, it is be possible to i
 dentify the substances that the paint consists of basing on the registrati
 on of THz absorption spectra. As a result\, one can learn about such prope
 rties of the analysed pieces of arts such as the depths of subsequent pain
 t layers or pigments. \nDuring investigations a specially prepared picture
  has been used. It was prepared using two types of paints: oil and acrylic
 \, covering its selected areas with different amount of varnish (different
  layer thickness). Then the whole painting was painted over with white pai
 nt. Two dimensional (x-y) scans of the entire painting were made with THz-
 TDS spectrometer in both transmission and reflection modes with the resolu
 tion better than 1 mm. The obtained results will be presented on the poste
 r.\n\nhttps://events.ncbj.gov.pl/event/75/contributions/747/
LOCATION:Novotel Warszawa Centrum Róża
URL:https://events.ncbj.gov.pl/event/75/contributions/747/
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