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U-shaped plastic optical fiber sensor for scale deposition in hot spring water

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Abstract

Fiber optic sensors for monitoring scale deposition in geothermal brine and hot spring water should be safe, easily fabricated, and readily disposable. These desired features already have been enhanced in plastic optical fibers (POFs) and U-shaped sensors for other applications. The present work reports a U-shaped POF sensor for CaCO3 scale deposition. The sensors were easily fabricated by thermally bending the bulk POF without removing the cladding. At the bend, the percentage of total internal reflection between the water and the POF surface is affected by the high refractive index of the CaCO3 deposit. The optical responses of the U-shaped sensor to CaCO3 formation were investigated in a mixture of calcium chloride dehydrate and sodium hydrogen carbonate using a white-light source and a spectroscopic detector. The sensor was responsive to CaCO3 formation on the sensor surface and was especially sensitive at small bending radii. The sensitivity was further enhanced by increasing the number of bends. Finally, the U-shaped POF sensor was applied to the monitoring of CaCO3 scale deposition in hot spring water sampled at Matsushiro, Japan.

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Acknowledgements

The authors wish to thank the Welfare Center for the Elderly in Matsushiro Hot Spring for their kind cooperation during our fieldwork.

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Authors and Affiliations

  1. Department of Applied Chemistry, School of Science and Technology, Meiji University, Kawasaki, Kanagawa, 214-8571, Japan

    Takuya Okazaki, Hisashi Kamio, Masaki Yoshioka & Tomoaki Watanabe

  2. Department of Environmental Biology and Chemistry, Graduate School of Science and Engineering for Research, University of Toyama, Toyama, 930-8555, Japan

    Akira Ueda & Hideki Kuramitz

Authors
  1. Takuya Okazaki
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  2. Hisashi Kamio
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  3. Masaki Yoshioka
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  4. Akira Ueda
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  5. Hideki Kuramitz
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  6. Tomoaki Watanabe
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Correspondence to Takuya Okazaki.

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Okazaki, T., Kamio, H., Yoshioka, M. et al. U-shaped plastic optical fiber sensor for scale deposition in hot spring water. ANAL. SCI. 38, 1549–1554 (2022). https://doi.org/10.1007/s44211-022-00189-1

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  • DOI: https://doi.org/10.1007/s44211-022-00189-1

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