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Sensors 2018, 18(6), 1884;

Strain Sensitivity Control of an In-Series Silica and Polymer FBG

Instituto de Telecomunicações, Campus de Santiago, 3810-193 Aveiro, Portugal
Instituto de Telecomunicações and I3N/FSCOSD, Institute of Nanostructures, Nanomodelling and Nanofabrication, Physics Department of University of Aveiro, 3810-193 Aveiro, Portugal
Author to whom correspondence should be addressed.
Received: 3 May 2018 / Revised: 2 June 2018 / Accepted: 6 June 2018 / Published: 8 June 2018
(This article belongs to the Section Physical Sensors)
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This work reports on the use of an in-series silica and polymer fiber Bragg grating (FBG) to control the FBG strain sensitivities and enhance in the case of the polymer fiber Bragg grating (PFBG). Due to differences in the Young’s Modulus of the fibers employed, the amount of strain is unequally distributed in each fiber section. By acting on the silica fiber length, it was possible to control the strain sensitivity of the two FBGs, allowing a polymer FBG strain sensitivity much higher than the one found in the elementary fiber to be obtained. The influence of the diameter of the polymer fiber on the strain sensitivities of the FBGs was also investigated. Results have shown that, besides the strain sensitivity control, an even greater improvement in the PFBG strain sensitivity can be achieved. View Full-Text
Keywords: fiber Bragg grating (FBG); polymer optical fiber (POF); optical fiber sensor (OFS) fiber Bragg grating (FBG); polymer optical fiber (POF); optical fiber sensor (OFS)

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Oliveira, R.; Bilro, L.; Nogueira, R. Strain Sensitivity Control of an In-Series Silica and Polymer FBG. Sensors 2018, 18, 1884.

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