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 proceedingConference contributionAcademicpeer-review

    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 languageEnglish
    Title of host publicationLasers in the Conservation of Artworks
    Subtitle of host publicationLACONA VI Proceedings, Vienna, Austria, Sept. 21-25, 2005
    EditorsJohann Nimmrichter, Wolfgang Kautek, Manfred Schreiner
    Place of PublicationBerlin, Heidelberg
    PublisherSpringer
    Pages437-444
    Number of pages8
    ISBN (Electronic)978-3-540-72130-7
    ISBN (Print)978-3-540-72129-1
    DOIs
    Publication statusPublished - 21 Sep 2007
    Event6th International Conference on Lasers in the Conservation of Artworks, LACONA 2005 - Vienna, Austria
    Duration: 21 Sep 200525 Sep 2005
    Conference number: 6

    Publication series

    NameSpringer Proceedings in Physics
    PublisherSpringer
    Volume116
    ISSN (Print)0930-8989

    Conference

    Conference6th International Conference on Lasers in the Conservation of Artworks, LACONA 2005
    Abbreviated titleLACONA
    CountryAustria
    CityVienna
    Period21/09/0525/09/05

    Fingerprint

    laser-induced breakdown spectroscopy
    cleaning
    lasers
    ablation
    correlation coefficients
    spectrometers
    sensitivity
    high resolution

    Keywords

    • METIS-232382

    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). Berlin, Heidelberg: 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).
    @inproceedings{9a1b7eb1f59b4766ae7665554c90ba67,
    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’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.",
    keywords = "METIS-232382",
    author = "Marco Lentjes and Klaus Dickmann and Johan Meijer",
    year = "2007",
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    language = "English",
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    series = "Springer Proceedings in Physics",
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    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 proceedingConference contributionAcademicpeer-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

    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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    M3 - Conference contribution

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    T3 - Springer Proceedings in Physics

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    EP - 444

    BT - Lasers in the Conservation of Artworks

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    A2 - Kautek, Wolfgang

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    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). https://doi.org/10.1007/978-3-540-72310-7_52