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. 2020 Jul 29;20(15):4215. doi: 10.3390/s20154215

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© 2020 by the authors.

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 (http://creativecommons.org/licenses/by/4.0/).

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The sensors were filled with PDMS: (a) D-shaped fiber coated with PDMS [28]; (b) Hollow core fiber filled with PDMS [29]; (c) Hollow core fiber filled with air gap-PDMS-air gap [30].

The sensors were filled with PDMS: (a) D-shaped fiber coated with PDMS [28]; (b) Hollow core fiber filled with PDMS [29]; (c) Hollow core fiber filled with air gap-PDMS-air gap [30].