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Special Issue "Recent Advances in Fiber Bragg Grating Sensing-2nd Edition"

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Photonics Research Center (PRC), Lumoscribe, Anthipoloxagou Georgiou M. Savva 12, Geroskipou, Paphos 8201, Cyprus
Interests: fiber Bragg gratings; optical sensors; waveguides; fiber lasers; polymer sensors
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Dr. Xuehao Hu

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Department of Electromagnetism and Telecommunication, University of Mons, 7000 Mons, Belgium
Interests: fiber Bragg gratings; tilted fiber Bragg gratings; polymer optical fiber sensors; surface plasmon resonance; biosensors
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Fiber Bragg gratings (FBGs) have been used in various applications for more than 40 years. They are reliable sensing elements and fiber laser components, with sensing characteristics that can be adjusted according to the host fiber material. This Special Issue aims to cover a broad spectrum of FBG sensing technology in the form of regular and review papers.

Topics of interest include, but are not limited to, the following:

Grating structures, tilted Bragg gratings, long-period gratings andchirped gratings;
FBGs in specialty optical fibers (polymer fibers, silica fibers, sapphire fibers etc.);
Advanced FBG-based mechanical and physical sensors;
Advanced FBG-based biomedical, chemical and environmental sensors;
Performance of FBG systems in real environments;
Demodulation algorithm and signal processing of complexed FBG sensors;
Performance of FBGs in harsh environments;
Acoustic sensors;
FBG applications in oil and gas industry, robotics, structural health monitoring, aerospace missions, civil structure, smart textiles and other areas.

Dr. Antreas Theodosiou
Dr. Xuehao Hu
Guest Editors

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Keywords

optical sensing
polymer optical fibers
fiber lasers
structural health monitoring
femtosecond lasers
demodulation algorithms
oil and gas sensing applications
biophotonics
robotics

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Research

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Open AccessArticle

Static and Dynamic Multiparameter Assessment of Structural Elements Using Chirped Fiber Bragg Gratings

and

Sensors 2023, 23(4), 1860; https://doi.org/10.3390/s23041860 - 07 Feb 2023

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Abstract

This paper presents the development, analysis, and application of chirped fiber Bragg gratings (CFBGs) for dynamic and static measurements of beams of different materials in the single-cantilever configuration. In this case, the beams were numerically analyzed using the finite-element method (FEM) for the assessment of the natural frequencies and vibration modes of the beam for the dynamic analysis of the structural element. Furthermore, the static numerical analysis was performed using a load at the free end of the beam, where the maximum strain and its distribution along the beam were analyzed, especially in the region at which the FBG was positioned. The experimental evaluation of the proposed CFBG sensor was performed in static conditions for forces from 0 to 50 N (in 10 N steps) applied at the free end of the beam, whereas the dynamic evaluation was performed by means of positioning an unbalanced motor at the end of the beam, which was excited at 16 Hz, 65 Hz, 100 Hz, and 131 Hz. The results showed the feasibility of the proposed device for the simultaneous assessment of the force and strain distribution along the CFBG region using the wavelength shift and the full-width at half-maximum (FWHM), respectively. In these cases, the determination coefficients of the spectral features as a function of the force and strain distribution were higher than 0.99 in all analyzed cases, where a potential resolution of 0.25 N was obtained on the force assessment. In the dynamic tests, the frequency spectrum of the sensor responses indicated a frequency peak at the excited frequency in all analyzed cases. Therefore, the proposed sensor device is a suitable option to extend the performance of sensors for structural health assessment, since it is possible to simultaneously measure different parameters in dynamic and static conditions using only one sensor device, which, due to its multiplexing capabilities, can be integrated with additional optical fiber sensors for the complete shape reconstruction with millimeter-range spatial resolution. Full article

(This article belongs to the Special Issue Recent Advances in Fiber Bragg Grating Sensing-2nd Edition)

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Review

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Open AccessReview

Influence of Annealing on Polymer Optical Fiber Bragg Grating Inscription, Stability and Sensing: A Review

Christophe Caucheteur

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Xuehao Hu

Sensors 2023, 23(17), 7578; https://doi.org/10.3390/s23177578 - 31 Aug 2023

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Abstract

This article reviews recent research progress on the annealing effects on polymer optical fibers (POFs), which are of great importance for inscription, stability and sensing applications of fiber Bragg gratings (FBGs) in POFs due to their unique properties related to polymer molecular chains. In this review, the principle of annealing to reduce frozen-in stress in POFs drawing and different annealing timings are firstly summarized. Then, the annealing methods for POFs are introduced under several different conditions (temperature, humidity, strain, stress and solution). Afterwards, the principle of FBGs and several inscription techniques are reported. Subsequently, the annealing effects on the properties of POFs and polymer optical fiber Bragg gratings (POFBGs) quality are discussed. Finally, the influence of annealing on POFBG sensitivity is summarized. Overall, this paper provides a comprehensive overview of annealing techniques and their impact on both POFs and POFBGs. We hope that it will highlight the important progress made in this field. Full article

(This article belongs to the Special Issue Recent Advances in Fiber Bragg Grating Sensing-2nd Edition)

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