Online measurement of optical fibre geometry during manufacturing

Maksim Shpak, Sven Burger, Ville Byman, Kimmo Saastamoinen, Mertsi Haapalainen, Antti Lassila

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Online measurement of diameters and concentricities of optical fibre layers, and the coating layer in particular, is one of the challenges in fibre manufacturing. Currently available instruments can measure concentricity and diameter of layers offline, and are not suitable for precise monitoring or control of the manufacturing process in real time. In this work, we use two laser beams, positioned orthogonally to illuminate the fibre from two sides, and calculate deviations from the expected geometry by analysing the scattering pattern. To measure the diffraction pattern we use two 8K linear array detectors, with the scattered light incident directly on the sensors. Each detector is capturing approximately 90° angular range directly behind the fibre. The two measurement channels are positioned at different heights. The scattered pattern is modelled mathematically with finite-element and Fourier-modal methods, with various diameter and concentricity deviations. The sensitivities of the changes in the scattering pattern are identified in respect to these deviations. Since calculations are computationally intensive, the sensitivities are pre-calculated in advance, and the realtime measurement is based on pattern recognition. The symmetry of the pattern is used to differentiate between diameter and concentricity variations. We performed online measurements with the prototype instrument in production conditions, and show that this method is sensitive enough to measure deviations of under 1 μm in diameter and concentricity of the coating layer.

Original languageEnglish
Title of host publicationFiber Lasers and Glass Photonics
Subtitle of host publicationMaterials through Applications
EditorsStefano Taccheo, Jacob I. Mackenzie, Maurizio Ferrari
PublisherInternational Society for Optics and Photonics SPIE
ISBN (Electronic)978-1-5106-1892-3
DOIs
Publication statusPublished - 2018
MoE publication typeA4 Article in a conference publication
EventFiber Lasers and Glass Photonics : Materials through Applications 2018 - Strasbourg, France
Duration: 22 Apr 201826 Apr 2018

Conference

ConferenceFiber Lasers and Glass Photonics
CountryFrance
CityStrasbourg
Period22/04/1826/04/18

Fingerprint

concentricity
On-line Measurement
Optical Fiber
Optical fibers
manufacturing
Manufacturing
optical fibers
Deviation
Geometry
deviation
geometry
Fibers
Fiber
Coating
fibers
Scattering
Detectors
Coatings
Detector
coatings

Keywords

  • Concentricity
  • Fibre
  • Manufacturing
  • Modelling
  • Scatterometry

Cite this

Shpak, M., Burger, S., Byman, V., Saastamoinen, K., Haapalainen, M., & Lassila, A. (2018). Online measurement of optical fibre geometry during manufacturing. In S. Taccheo, J. I. Mackenzie, & M. Ferrari (Eds.), Fiber Lasers and Glass Photonics: Materials through Applications [1068318] International Society for Optics and Photonics SPIE. Proceedings of SPIE, Vol.. 10683 https://doi.org/10.1117/12.2314762
Shpak, Maksim ; Burger, Sven ; Byman, Ville ; Saastamoinen, Kimmo ; Haapalainen, Mertsi ; Lassila, Antti. / Online measurement of optical fibre geometry during manufacturing. Fiber Lasers and Glass Photonics: Materials through Applications. editor / Stefano Taccheo ; Jacob I. Mackenzie ; Maurizio Ferrari. International Society for Optics and Photonics SPIE, 2018. (Proceedings of SPIE, Vol. 10683).
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title = "Online measurement of optical fibre geometry during manufacturing",
abstract = "Online measurement of diameters and concentricities of optical fibre layers, and the coating layer in particular, is one of the challenges in fibre manufacturing. Currently available instruments can measure concentricity and diameter of layers offline, and are not suitable for precise monitoring or control of the manufacturing process in real time. In this work, we use two laser beams, positioned orthogonally to illuminate the fibre from two sides, and calculate deviations from the expected geometry by analysing the scattering pattern. To measure the diffraction pattern we use two 8K linear array detectors, with the scattered light incident directly on the sensors. Each detector is capturing approximately 90° angular range directly behind the fibre. The two measurement channels are positioned at different heights. The scattered pattern is modelled mathematically with finite-element and Fourier-modal methods, with various diameter and concentricity deviations. The sensitivities of the changes in the scattering pattern are identified in respect to these deviations. Since calculations are computationally intensive, the sensitivities are pre-calculated in advance, and the realtime measurement is based on pattern recognition. The symmetry of the pattern is used to differentiate between diameter and concentricity variations. We performed online measurements with the prototype instrument in production conditions, and show that this method is sensitive enough to measure deviations of under 1 μm in diameter and concentricity of the coating layer.",
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Shpak, M, Burger, S, Byman, V, Saastamoinen, K, Haapalainen, M & Lassila, A 2018, Online measurement of optical fibre geometry during manufacturing. in S Taccheo, JI Mackenzie & M Ferrari (eds), Fiber Lasers and Glass Photonics: Materials through Applications., 1068318, International Society for Optics and Photonics SPIE, Proceedings of SPIE, vol. 10683, Fiber Lasers and Glass Photonics , Strasbourg, France, 22/04/18. https://doi.org/10.1117/12.2314762

Online measurement of optical fibre geometry during manufacturing. / Shpak, Maksim; Burger, Sven; Byman, Ville; Saastamoinen, Kimmo; Haapalainen, Mertsi; Lassila, Antti.

Fiber Lasers and Glass Photonics: Materials through Applications. ed. / Stefano Taccheo; Jacob I. Mackenzie; Maurizio Ferrari. International Society for Optics and Photonics SPIE, 2018. 1068318 (Proceedings of SPIE, Vol. 10683).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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AB - Online measurement of diameters and concentricities of optical fibre layers, and the coating layer in particular, is one of the challenges in fibre manufacturing. Currently available instruments can measure concentricity and diameter of layers offline, and are not suitable for precise monitoring or control of the manufacturing process in real time. In this work, we use two laser beams, positioned orthogonally to illuminate the fibre from two sides, and calculate deviations from the expected geometry by analysing the scattering pattern. To measure the diffraction pattern we use two 8K linear array detectors, with the scattered light incident directly on the sensors. Each detector is capturing approximately 90° angular range directly behind the fibre. The two measurement channels are positioned at different heights. The scattered pattern is modelled mathematically with finite-element and Fourier-modal methods, with various diameter and concentricity deviations. The sensitivities of the changes in the scattering pattern are identified in respect to these deviations. Since calculations are computationally intensive, the sensitivities are pre-calculated in advance, and the realtime measurement is based on pattern recognition. The symmetry of the pattern is used to differentiate between diameter and concentricity variations. We performed online measurements with the prototype instrument in production conditions, and show that this method is sensitive enough to measure deviations of under 1 μm in diameter and concentricity of the coating layer.

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Shpak M, Burger S, Byman V, Saastamoinen K, Haapalainen M, Lassila A. Online measurement of optical fibre geometry during manufacturing. In Taccheo S, Mackenzie JI, Ferrari M, editors, Fiber Lasers and Glass Photonics: Materials through Applications. International Society for Optics and Photonics SPIE. 2018. 1068318. (Proceedings of SPIE, Vol. 10683). https://doi.org/10.1117/12.2314762