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Special Issue "Recent Advances in Fiber Bragg Grating Based Sensors"

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Physical Sensors".

Deadline for manuscript submissions: closed (30 August 2018)

Special Issue Editors

Guest Editor
Prof. Dr. Francis Berghmans

Vrije Universiteit Brussel, Brussels Photonics B-PHOT, Department of Applied Physics and Photonics, Pleinlaan 2, 1050 Brussels, and Flanders Make, Belgium
Website | E-Mail
Interests: specialty and micro-structured optical fiber Bragg grating based sensors for structural health monitoring applications
Guest Editor
Prof. Dr. Thomas Geernaert

Vrije Universiteit Brussel, Brussels Photonics B-PHOT, Department of Applied Physics and Photonics, Pleinlaan 2, 1050 Brussels, and Flanders Make, Belgium
Website | E-Mail
Interests: specialty and micro-structured optical fiber Bragg grating based sensors for structural health monitoring applications

Special Issue Information

Dear Colleagues,

Optical fiber grating based sensors have been the subject of extensive and relentless research efforts over the past 40 years. This Special Issue focuses on the latest developments and trends in this field, from research on new grating fabrication technologies to sensor applications in diverse fields such as bio, medical and structural health monitoring, and from grating device-level studies to new sensor interrogation technologies, interrogation and signal processing methods. We wholeheartedly invite you to participate by submitting both original research papers and review articles on fiber grating based sensor technologies. Join us in highlighting novel approaches and applications in this very active and continuously evolving research and innovation area.

Prof. Dr. Francis Berghmans
Prof. Dr. Thomas Geernaert
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • fiber Bragg grating
  • long period grating
  • tilted grating
  • point-by-point grating
  • plane-by-plane grating
  • long faint grating
  • dynamic grating
  • femtosecond pulsed lasers
  • laser based micromachined gratings
  • imprinted gratings
  • photosensitivity
  • polymer optical fiber
  • micro-structured optical fiber
  • photonic crystal fiber
  • embedded gratings
  • grating based transducers
  • photonic integrated circuit
  • grating interrogation techniques
  • grating signal processing methods
  • bio-photonics
  • bio-medical
  • structural health monitoring
  • smart structures
  • oil and gas
  • robotics

Published Papers (5 papers)

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Research

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Open AccessArticle Study on the Optimal Groove Shape and Glue Material for Fiber Bragg Grating Measuring Bolts
Sensors 2018, 18(6), 1799; https://doi.org/10.3390/s18061799
Received: 29 March 2018 / Revised: 23 May 2018 / Accepted: 29 May 2018 / Published: 2 June 2018
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Abstract
Fiber Bragg grating (FBG) measuring bolts, as a useful tool to evaluate the behaviors of steel bolts in underground engineering, can be manufactured by gluing the FBG sensors inside the grooves, which are usually symmetrical cuts along the steel bolt rod. The selection
[...] Read more.
Fiber Bragg grating (FBG) measuring bolts, as a useful tool to evaluate the behaviors of steel bolts in underground engineering, can be manufactured by gluing the FBG sensors inside the grooves, which are usually symmetrical cuts along the steel bolt rod. The selection of the cut shape and the glue types could perceivably affect the final supporting strength of the bolts. Unfortunately, the impact of cut shape and glue type on bolting strength is not yet clear. In this study, based on direct tension tests, full tensile load–displacement curves of rock bolts with different groove shapes were obtained and analyzed. The effects of groove shape on the bolt strength were discussed, and the stress redistribution in the cross-section of a rock bolt with different grooves was simulated using ANSYS. The results indicated that the trapezoidal groove is best for manufacturing the FBG bolt due to its low reduction of supporting strength. Four types of glues commonly used for the FBG sensors were assessed by conducting tensile tests on the mechanical testing and simulation system and the static and dynamic optical interrogators system. Using linear regression analysis, the relationship between the reflected wavelength of FBG sensors and tensile load was obtained. Practical recommendations for glue selection in engineering practice are also provided. Full article
(This article belongs to the Special Issue Recent Advances in Fiber Bragg Grating Based Sensors)
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Open AccessArticle Sensitivity Enhancement of FBG-Based Strain Sensor
Sensors 2018, 18(5), 1607; https://doi.org/10.3390/s18051607
Received: 16 April 2018 / Revised: 12 May 2018 / Accepted: 14 May 2018 / Published: 17 May 2018
Cited by 2 | PDF Full-text (2998 KB) | HTML Full-text | XML Full-text
Abstract
A novel fiber Bragg grating (FBG)-based strain sensor with a high-sensitivity is presented in this paper. The proposed FBG-based strain sensor enhances sensitivity by pasting the FBG on a substrate with a lever structure. This typical mechanical configuration mechanically amplifies the strain of
[...] Read more.
A novel fiber Bragg grating (FBG)-based strain sensor with a high-sensitivity is presented in this paper. The proposed FBG-based strain sensor enhances sensitivity by pasting the FBG on a substrate with a lever structure. This typical mechanical configuration mechanically amplifies the strain of the FBG to enhance overall sensitivity. As this mechanical configuration has a high stiffness, the proposed sensor can achieve a high resonant frequency and a wide dynamic working range. The sensing principle is presented, and the corresponding theoretical model is derived and validated. Experimental results demonstrate that the developed FBG-based strain sensor achieves an enhanced strain sensitivity of 6.2 pm/με, which is consistent with the theoretical analysis result. The strain sensitivity of the developed sensor is 5.2 times of the strain sensitivity of a bare fiber Bragg grating strain sensor. The dynamic characteristics of this sensor are investigated through the finite element method (FEM) and experimental tests. The developed sensor exhibits an excellent strain-sensitivity-enhancing property in a wide frequency range. The proposed high-sensitivity FBG-based strain sensor can be used for small-amplitude micro-strain measurement in harsh industrial environments. Full article
(This article belongs to the Special Issue Recent Advances in Fiber Bragg Grating Based Sensors)
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Open AccessArticle A Fiber Bragg Grating Interrogation System with Self-Adaption Threshold Peak Detection Algorithm
Sensors 2018, 18(4), 1140; https://doi.org/10.3390/s18041140
Received: 6 February 2018 / Revised: 3 April 2018 / Accepted: 4 April 2018 / Published: 8 April 2018
Cited by 2 | PDF Full-text (47907 KB) | HTML Full-text | XML Full-text
Abstract
A Fiber Bragg Grating (FBG) interrogation system with a self-adaption threshold peak detection algorithm is proposed and experimentally demonstrated in this study. This system is composed of a field programmable gate array (FPGA) and advanced RISC machine (ARM) platform, tunable Fabry–Perot (F–P) filter
[...] Read more.
A Fiber Bragg Grating (FBG) interrogation system with a self-adaption threshold peak detection algorithm is proposed and experimentally demonstrated in this study. This system is composed of a field programmable gate array (FPGA) and advanced RISC machine (ARM) platform, tunable Fabry–Perot (F–P) filter and optical switch. To improve system resolution, the F–P filter was employed. As this filter is non-linear, this causes the shifting of central wavelengths with the deviation compensated by the parts of the circuit. Time-division multiplexing (TDM) of FBG sensors is achieved by an optical switch, with the system able to realize the combination of 256 FBG sensors. The wavelength scanning speed of 800 Hz can be achieved by a FPGA+ARM platform. In addition, a peak detection algorithm based on a self-adaption threshold is designed and the peak recognition rate is 100%. Experiments with different temperatures were conducted to demonstrate the effectiveness of the system. Four FBG sensors were examined in the thermal chamber without stress. When the temperature changed from 0 °C to 100 °C, the degree of linearity between central wavelengths and temperature was about 0.999 with the temperature sensitivity being 10 pm/°C. The static interrogation precision was able to reach 0.5 pm. Through the comparison of different peak detection algorithms and interrogation approaches, the system was verified to have an optimum comprehensive performance in terms of precision, capacity and speed. Full article
(This article belongs to the Special Issue Recent Advances in Fiber Bragg Grating Based Sensors)
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Open AccessArticle A Newly Designed Fiber-Optic Based Earth Pressure Transducer with Adjustable Measurement Range
Sensors 2018, 18(4), 932; https://doi.org/10.3390/s18040932
Received: 3 February 2018 / Revised: 14 March 2018 / Accepted: 15 March 2018 / Published: 21 March 2018
Cited by 1 | PDF Full-text (9062 KB) | HTML Full-text | XML Full-text
Abstract
A novel fiber-optic based earth pressure sensor (FPS) with an adjustable measurement range and high sensitivity is developed to measure earth pressures for civil infrastructures. The new FPS combines a cantilever beam with fiber Bragg grating (FBG) sensors and a flexible membrane. Compared
[...] Read more.
A novel fiber-optic based earth pressure sensor (FPS) with an adjustable measurement range and high sensitivity is developed to measure earth pressures for civil infrastructures. The new FPS combines a cantilever beam with fiber Bragg grating (FBG) sensors and a flexible membrane. Compared with a traditional pressure transducer with a dual diaphragm design, the proposed FPS has a larger measurement range and shows high accuracy. The working principles, parameter design, fabrication methods, and laboratory calibration tests are explained in this paper. A theoretical solution is derived to obtain the relationship between the applied pressure and strain of the FBG sensors. In addition, a finite element model is established to analyze the mechanical behavior of the membrane and the cantilever beam and thereby obtain optimal parameters. The cantilever beam is 40 mm long, 15 mm wide, and 1 mm thick. The whole FPS has a diameter of 100 mm and a thickness of 30 mm. The sensitivity of the FPS is 0.104 kPa/με. In addition, automatic temperature compensation can be achieved. The FPS’s sensitivity, physical properties, and response to applied pressure are extensively examined through modeling and experiments. The results show that the proposed FPS has numerous potential applications in soil pressure measurement. Full article
(This article belongs to the Special Issue Recent Advances in Fiber Bragg Grating Based Sensors)
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Review

Jump to: Research

Open AccessReview Review of Chirped Fiber Bragg Grating (CFBG) Fiber-Optic Sensors and Their Applications
Sensors 2018, 18(7), 2147; https://doi.org/10.3390/s18072147
Received: 29 May 2018 / Revised: 26 June 2018 / Accepted: 27 June 2018 / Published: 4 July 2018
Cited by 2 | PDF Full-text (3444 KB) | HTML Full-text | XML Full-text
Abstract
Fiber Bragg Gratings (FBGs) are one of the most popular technology within fiber-optic sensors, and they allow the measurement of mechanical, thermal, and physical parameters. In recent years, a strong emphasis has been placed on the fabrication and application of chirped FBGs (CFBGs),
[...] Read more.
Fiber Bragg Gratings (FBGs) are one of the most popular technology within fiber-optic sensors, and they allow the measurement of mechanical, thermal, and physical parameters. In recent years, a strong emphasis has been placed on the fabrication and application of chirped FBGs (CFBGs), which are characterized by a non-uniform modulation of the refractive index within the core of an optical fiber. A CFBG behaves as a cascade of FBGs, each one reflecting a narrow spectrum that depends on temperature and/or strain. The key characteristic of CFBGs is that their reflection spectrum depends on the strain/temperature observed in each section of the grating; thus, they enable a short-length distributed sensing, whereas it is possible to detect spatially resolved variations of temperature or strain with resolution on the order of a millimeter over the grating length. Based on this premise, CFBGs have found important applications in healthcare, mechanical engineering, and shock waves analysis, among others. This work reviews the present and emerging trends in CFBG sensors, focusing on all aspects of the sensing element and outlining the application case scenarios for which CFBG sensors have been demonstrated. Full article
(This article belongs to the Special Issue Recent Advances in Fiber Bragg Grating Based Sensors)
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