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. 2018 Jun 8;18(6):1884.
doi: 10.3390/s18061884.

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

Ricardo Oliveira  1 , Lúcia Bilro  2   3 , Rogério Nogueira  4
Affiliations
Free PMC article

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

Ricardo Oliveira et al. Sensors (Basel). .
Free PMC article

Abstract

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.

Keywords: fiber Bragg grating (FBG); optical fiber sensor (OFS); polymer optical fiber (POF).

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Schematic of the sensor, employing an FBG in a POF, in-series with a silica FBG by means of a UVsplice using a photopolymerizable adhesive. Li, and di represent the length and diameter of the fibers, respectively.
Figure 2
Figure 2
Reflection spectra obtained, when the fibers were unstrained and strained with 400 µε, for the sensing head with: (a) raw and (b) etched POF, considering 2.7 cm mPOF and 1.00 m gauge lengths.
Figure 3
Figure 3
Sensitivity results of the silica and polymer FBGs, considering 2.7 cm mPOF and gauge lengths of 0.05, 0.30 and 1.00 m, for the sensing head with: (a) raw and (b) etched mPOF.
Figure 4
Figure 4
Theoretical and experimental results obtained from Equations (2) and (3) with a 2.7 cm mPOF, considering different gauge lengths, for the sensing head composed of: (a) raw and (b) etched mPOF.
Figure 5
Figure 5
Maximum strain on the fiber sensing heads, considering an elastic regime.
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