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Non-Contact Paper Thickness and Quality Monitoring Based on Mid-Infrared Optical Coherence Tomography and THz Time Domain Spectroscopy

In industrial paper production, online monitoring of a range of quality parameters is essential for ensuring that the performance and appearance of the final product is suitable for a given application. In this article, two optical sensing techniques are investigated for non-destructive, non-contact...

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Autores principales: Hansen, Rasmus Eilkær, Bæk, Thorsten, Lange, Simon Lehnskov, Israelsen, Niels Møller, Mäntylä, Markku, Bang, Ole, Petersen, Christian Rosenberg
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8877368/
https://www.ncbi.nlm.nih.gov/pubmed/35214449
http://dx.doi.org/10.3390/s22041549
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author Hansen, Rasmus Eilkær
Bæk, Thorsten
Lange, Simon Lehnskov
Israelsen, Niels Møller
Mäntylä, Markku
Bang, Ole
Petersen, Christian Rosenberg
author_facet Hansen, Rasmus Eilkær
Bæk, Thorsten
Lange, Simon Lehnskov
Israelsen, Niels Møller
Mäntylä, Markku
Bang, Ole
Petersen, Christian Rosenberg
author_sort Hansen, Rasmus Eilkær
collection PubMed
description In industrial paper production, online monitoring of a range of quality parameters is essential for ensuring that the performance and appearance of the final product is suitable for a given application. In this article, two optical sensing techniques are investigated for non-destructive, non-contact characterization of paper thickness, surface roughness, and production defects. The first technique is optical coherence tomography based on a mid-infrared supercontinuum laser, which can cover thicknesses from ~20–90 μm and provide information about the surface finish. Detection of subsurface voids, cuts, and oil contamination was also demonstrated. The second technique is terahertz time domain spectroscopy, which is used to measure paper thicknesses of up to 443 μm. A proof-of-concept thickness measurement in freely suspended paper was also demonstrated. These demonstrations highlight the added functionality and potential of tomographic optical sensing methods towards industrial non-contact quality monitoring.
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spelling pubmed-88773682022-02-26 Non-Contact Paper Thickness and Quality Monitoring Based on Mid-Infrared Optical Coherence Tomography and THz Time Domain Spectroscopy Hansen, Rasmus Eilkær Bæk, Thorsten Lange, Simon Lehnskov Israelsen, Niels Møller Mäntylä, Markku Bang, Ole Petersen, Christian Rosenberg Sensors (Basel) Article In industrial paper production, online monitoring of a range of quality parameters is essential for ensuring that the performance and appearance of the final product is suitable for a given application. In this article, two optical sensing techniques are investigated for non-destructive, non-contact characterization of paper thickness, surface roughness, and production defects. The first technique is optical coherence tomography based on a mid-infrared supercontinuum laser, which can cover thicknesses from ~20–90 μm and provide information about the surface finish. Detection of subsurface voids, cuts, and oil contamination was also demonstrated. The second technique is terahertz time domain spectroscopy, which is used to measure paper thicknesses of up to 443 μm. A proof-of-concept thickness measurement in freely suspended paper was also demonstrated. These demonstrations highlight the added functionality and potential of tomographic optical sensing methods towards industrial non-contact quality monitoring. MDPI 2022-02-17 /pmc/articles/PMC8877368/ /pubmed/35214449 http://dx.doi.org/10.3390/s22041549 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hansen, Rasmus Eilkær
Bæk, Thorsten
Lange, Simon Lehnskov
Israelsen, Niels Møller
Mäntylä, Markku
Bang, Ole
Petersen, Christian Rosenberg
Non-Contact Paper Thickness and Quality Monitoring Based on Mid-Infrared Optical Coherence Tomography and THz Time Domain Spectroscopy
title Non-Contact Paper Thickness and Quality Monitoring Based on Mid-Infrared Optical Coherence Tomography and THz Time Domain Spectroscopy
title_full Non-Contact Paper Thickness and Quality Monitoring Based on Mid-Infrared Optical Coherence Tomography and THz Time Domain Spectroscopy
title_fullStr Non-Contact Paper Thickness and Quality Monitoring Based on Mid-Infrared Optical Coherence Tomography and THz Time Domain Spectroscopy
title_full_unstemmed Non-Contact Paper Thickness and Quality Monitoring Based on Mid-Infrared Optical Coherence Tomography and THz Time Domain Spectroscopy
title_short Non-Contact Paper Thickness and Quality Monitoring Based on Mid-Infrared Optical Coherence Tomography and THz Time Domain Spectroscopy
title_sort non-contact paper thickness and quality monitoring based on mid-infrared optical coherence tomography and thz time domain spectroscopy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8877368/
https://www.ncbi.nlm.nih.gov/pubmed/35214449
http://dx.doi.org/10.3390/s22041549
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