Low Resolution LIBS for Online-Monitoring During Laser Cleaning Based on Correlation with Reference Spectra

Marco Lentjes; Klaus Dickmann; Johan Meijer

doi:10.1007/978-3-540-72310-7_52

Low Resolution LIBS for Online-Monitoring During Laser Cleaning Based on Correlation with Reference Spectra

Marco Lentjes, Klaus Dickmann, Johan Meijer

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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Abstract

Based on a commercial miniature spectrometer, we have built a LIBSsystem for online monitoring and controlling during laser cleaning of artworks. In contrast to common LIBS set-ups with ICCDs, our system offers less sensitivity and λ-resolution. This system is unsuitable for high resolution elemental identification but it is applicable for the detection of “spectral fingerprints”. A powerful method of comparison online spectra during laser cleaning process with reference spectra is the analysis of correlation. Based on “Pearson’s correlation”, the linear relationship between entire data sets of both spectra are classified by the correlation coefficient r. In practise of laser cleaning a permanent comparison of the spectrum from the ablated layer with a reference spectrum of the layer to be preserved is necessary. Thus, online monitoring of the cleaning process is enabled by permanent estimation of r. In case of closed-loop laser cleaning the ablation will continue until r exceeds a predefined value and subsequently the ablation process is automatically stopped.

Original language	English
Title of host publication	Lasers in the Conservation of Artworks
Subtitle of host publication	LACONA VI Proceedings, Vienna, Austria, Sept. 21-25, 2005
Editors	Johann Nimmrichter, Wolfgang Kautek, Manfred Schreiner
Place of Publication	Berlin, Heidelberg
Publisher	Springer
Pages	437-444
Number of pages	8
ISBN (Electronic)	978-3-540-72130-7
ISBN (Print)	978-3-540-72129-1
DOIs	https://doi.org/10.1007/978-3-540-72310-7_52
Publication status	Published - 21 Sept 2007
Event	6th International Conference on Lasers in the Conservation of Artworks, LACONA 2005 - Vienna, Austria Duration: 21 Sept 2005 → 25 Sept 2005 Conference number: 6

Publication series

Name	Springer Proceedings in Physics
Publisher	Springer
Volume	116
ISSN (Print)	0930-8989

Conference

Conference	6th International Conference on Lasers in the Conservation of Artworks, LACONA 2005
Abbreviated title	LACONA
Country/Territory	Austria
City	Vienna
Period	21/09/05 → 25/09/05

Keywords

METIS-232382

Access to Document

10.1007/978-3-540-72310-7_52

Cite this

Lentjes, M., Dickmann, K., & Meijer, J. (2007). Low Resolution LIBS for Online-Monitoring During Laser Cleaning Based on Correlation with Reference Spectra. In J. Nimmrichter, W. Kautek, & M. Schreiner (Eds.), Lasers in the Conservation of Artworks: LACONA VI Proceedings, Vienna, Austria, Sept. 21-25, 2005 (pp. 437-444). (Springer Proceedings in Physics; Vol. 116). Springer. https://doi.org/10.1007/978-3-540-72310-7_52

Lentjes, Marco ; Dickmann, Klaus ; Meijer, Johan. / Low Resolution LIBS for Online-Monitoring During Laser Cleaning Based on Correlation with Reference Spectra. Lasers in the Conservation of Artworks: LACONA VI Proceedings, Vienna, Austria, Sept. 21-25, 2005. editor / Johann Nimmrichter ; Wolfgang Kautek ; Manfred Schreiner. Berlin, Heidelberg : Springer, 2007. pp. 437-444 (Springer Proceedings in Physics).

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title = "Low Resolution LIBS for Online-Monitoring During Laser Cleaning Based on Correlation with Reference Spectra",

abstract = "Based on a commercial miniature spectrometer, we have built a LIBSsystem for online monitoring and controlling during laser cleaning of artworks. In contrast to common LIBS set-ups with ICCDs, our system offers less sensitivity and λ-resolution. This system is unsuitable for high resolution elemental identification but it is applicable for the detection of “spectral fingerprints”. A powerful method of comparison online spectra during laser cleaning process with reference spectra is the analysis of correlation. Based on “Pearson{\textquoteright}s correlation”, the linear relationship between entire data sets of both spectra are classified by the correlation coefficient r. In practise of laser cleaning a permanent comparison of the spectrum from the ablated layer with a reference spectrum of the layer to be preserved is necessary. Thus, online monitoring of the cleaning process is enabled by permanent estimation of r. In case of closed-loop laser cleaning the ablation will continue until r exceeds a predefined value and subsequently the ablation process is automatically stopped.",

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author = "Marco Lentjes and Klaus Dickmann and Johan Meijer",

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series = "Springer Proceedings in Physics",

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editor = "Johann Nimmrichter and Wolfgang Kautek and Manfred Schreiner",

booktitle = "Lasers in the Conservation of Artworks",

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Lentjes, M, Dickmann, K & Meijer, J 2007, Low Resolution LIBS for Online-Monitoring During Laser Cleaning Based on Correlation with Reference Spectra. in J Nimmrichter, W Kautek & M Schreiner (eds), Lasers in the Conservation of Artworks: LACONA VI Proceedings, Vienna, Austria, Sept. 21-25, 2005. Springer Proceedings in Physics, vol. 116, Springer, Berlin, Heidelberg, pp. 437-444, 6th International Conference on Lasers in the Conservation of Artworks, LACONA 2005, Vienna, Austria, 21/09/05. https://doi.org/10.1007/978-3-540-72310-7_52

Low Resolution LIBS for Online-Monitoring During Laser Cleaning Based on Correlation with Reference Spectra. / Lentjes, Marco; Dickmann, Klaus; Meijer, Johan.
Lasers in the Conservation of Artworks: LACONA VI Proceedings, Vienna, Austria, Sept. 21-25, 2005. ed. / Johann Nimmrichter; Wolfgang Kautek; Manfred Schreiner. Berlin, Heidelberg: Springer, 2007. p. 437-444 (Springer Proceedings in Physics; Vol. 116).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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T1 - Low Resolution LIBS for Online-Monitoring During Laser Cleaning Based on Correlation with Reference Spectra

AU - Lentjes, Marco

AU - Dickmann, Klaus

AU - Meijer, Johan

N1 - Conference code: 6

PY - 2007/9/21

Y1 - 2007/9/21

N2 - Based on a commercial miniature spectrometer, we have built a LIBSsystem for online monitoring and controlling during laser cleaning of artworks. In contrast to common LIBS set-ups with ICCDs, our system offers less sensitivity and λ-resolution. This system is unsuitable for high resolution elemental identification but it is applicable for the detection of “spectral fingerprints”. A powerful method of comparison online spectra during laser cleaning process with reference spectra is the analysis of correlation. Based on “Pearson’s correlation”, the linear relationship between entire data sets of both spectra are classified by the correlation coefficient r. In practise of laser cleaning a permanent comparison of the spectrum from the ablated layer with a reference spectrum of the layer to be preserved is necessary. Thus, online monitoring of the cleaning process is enabled by permanent estimation of r. In case of closed-loop laser cleaning the ablation will continue until r exceeds a predefined value and subsequently the ablation process is automatically stopped.

AB - Based on a commercial miniature spectrometer, we have built a LIBSsystem for online monitoring and controlling during laser cleaning of artworks. In contrast to common LIBS set-ups with ICCDs, our system offers less sensitivity and λ-resolution. This system is unsuitable for high resolution elemental identification but it is applicable for the detection of “spectral fingerprints”. A powerful method of comparison online spectra during laser cleaning process with reference spectra is the analysis of correlation. Based on “Pearson’s correlation”, the linear relationship between entire data sets of both spectra are classified by the correlation coefficient r. In practise of laser cleaning a permanent comparison of the spectrum from the ablated layer with a reference spectrum of the layer to be preserved is necessary. Thus, online monitoring of the cleaning process is enabled by permanent estimation of r. In case of closed-loop laser cleaning the ablation will continue until r exceeds a predefined value and subsequently the ablation process is automatically stopped.

KW - METIS-232382

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T3 - Springer Proceedings in Physics

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BT - Lasers in the Conservation of Artworks

A2 - Nimmrichter, Johann

A2 - Kautek, Wolfgang

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T2 - 6th International Conference on Lasers in the Conservation of Artworks, LACONA 2005

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ER -

Lentjes M, Dickmann K, Meijer J. Low Resolution LIBS for Online-Monitoring During Laser Cleaning Based on Correlation with Reference Spectra. In Nimmrichter J, Kautek W, Schreiner M, editors, Lasers in the Conservation of Artworks: LACONA VI Proceedings, Vienna, Austria, Sept. 21-25, 2005. Berlin, Heidelberg: Springer. 2007. p. 437-444. (Springer Proceedings in Physics). doi: 10.1007/978-3-540-72310-7_52

Low Resolution LIBS for Online-Monitoring During Laser Cleaning Based on Correlation with Reference Spectra

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