LIBS-spectroscopy for monitoring and control of the laser cleaning process of stone and medieval glass

Stefan Klein, Jens Hildenhagen, Klaus Dickmann, T. Stratoudaki, Vassilis Zafiropulos

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

On-line monitoring or even closed-loop control is necessary to avoid over-cleaning in case the ablation process is not self-limiting. Therefore, the laser-induced breakdown spectroscopy (LIBS) was used. Basic investigations were carried out on original sandstone samples (Elbsandstein) with strong encrustations as well as medieval stained glass samples (13th century from Cologne Cathedral). The spectroscopic study has shown that the plasma emission can be used for determination of the elemental composition of the ablated material. The plasma was initiated by 248-nm pulses of an KrF-excimer laser (30 ns FWHM). For the spectroscopic analysis, a grating spectrograph in combination with an optical multichannel analyser was used. For the glass and stone samples we obtained a continual alteration of the LIBS spectrum (vanishing of peaks and generating of new element peaks) during the removal process. Thus, certain element peaks can be used to distinguish between encrustation layer and valuable underlying material. To show the potential of LIBS we designed an experimental laser cleaning set-up including closed-loop LIBS control and demonstrated successful automatic cleaning of an original glass fragment.

LanguageEnglish
PagesS287-S292
Number of pages6
JournalJournal of Cultural Heritage
Volume1
DOIs
Publication statusPublished - 1 Aug 2000
Externally publishedYes

Fingerprint

Laser induced breakdown spectroscopy
Cleaning
Spectroscopy
monitoring
Glass
Lasers
Monitoring
Stained glass
Plasmas
Spectroscopic analysis
Spectrographs
Excimer lasers
Ablation
Full width at half maximum
Sandstone
Laser pulses
Medieval Period
Laser
Laser-induced Breakdown Spectroscopy
Breakdown

Keywords

  • laser cleaning
  • LIBS
  • medieval glass
  • online monitoring
  • sandstone
  • laser induced breakdown spectroscopy

Cite this

Klein, Stefan ; Hildenhagen, Jens ; Dickmann, Klaus ; Stratoudaki, T. ; Zafiropulos, Vassilis. / LIBS-spectroscopy for monitoring and control of the laser cleaning process of stone and medieval glass. In: Journal of Cultural Heritage. 2000 ; Vol. 1. pp. S287-S292.
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LIBS-spectroscopy for monitoring and control of the laser cleaning process of stone and medieval glass. / Klein, Stefan; Hildenhagen, Jens; Dickmann, Klaus; Stratoudaki, T.; Zafiropulos, Vassilis.

In: Journal of Cultural Heritage, Vol. 1, 01.08.2000, p. S287-S292.

Research output: Contribution to journalArticle

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