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Special Issue "Optical Fiber Sensors and Photonic Devices"

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

Deadline for manuscript submissions: 15 May 2020.

Special Issue Editor

Prof. Dr. Yasufumi Enami
E-Mail Website
Guest Editor
University of Fukui, Fukui 910-8507, Japan
Interests: optical fiber sensors and devices; biophotonic sensors; optical networks; micro and nano devices; polymer photonics; optical sensors for autonomous driving
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

Optical fiber sensors and photonic devices have been applied in various photonic applications, due to their capability for high-speed, remote, multiple, and distributed sensing, which expands the possibilities of sensing capabilities. Optical fiber sensors have been integrated with photonic materials using semiconductor and organic materials. For example, the use of sensing materials both on and in optical fibers is well-established for optical, chemical, and biochemical sensors. The porous and slot structure of optical fibers has the advantage of being accepting various kinds of materials, which improves the sensing capabilities.

This Special Issue aims to present novel and innovative application of sensors and devices based on optical fiber sensors and photonic devices and, overall, address the wide range of applications of optical sensors. Both review articles and original research papers related to the application of optical fiber sensors and photonic devices are solicited.

Prof. Dr. Yasufumi Enami
Guest Editor

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 semimonthly 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

  • Optical fiber sensors and photonic materials;
  • Novel structure of optical fiber devices for sensing applications;
  • Novel materials for optical fiber sensors;
  • Optical and electrical integration for sensing

Published Papers (6 papers)

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Research

Open AccessArticle
Optical Harmonic Vernier Effect: A New Tool for High Performance Interferometric Fibre Sensors
Sensors 2019, 19(24), 5431; https://doi.org/10.3390/s19245431 - 09 Dec 2019
Abstract
The optical Vernier effect magnifies the sensing capabilities of an interferometer, allowing for unprecedented sensitivities and resolutions to be achieved. Just like a caliper uses two different scales to achieve higher resolution measurements, the optical Vernier effect is based on the overlap in [...] Read more.
The optical Vernier effect magnifies the sensing capabilities of an interferometer, allowing for unprecedented sensitivities and resolutions to be achieved. Just like a caliper uses two different scales to achieve higher resolution measurements, the optical Vernier effect is based on the overlap in the responses of two interferometers with slightly detuned interference signals. Here, we present a novel approach in detail, which introduces optical harmonics to the Vernier effect through Fabry–Perot interferometers, where the two interferometers can have very different frequencies in the interferometric pattern. We demonstrate not only a considerable enhancement compared to current methods, but also better control of the sensitivity magnification factor, which scales up with the order of the harmonics, allowing us to surpass the limits of the conventional Vernier effect as used today. In addition, this novel concept opens also new ways of dimensioning the sensing structures, together with improved fabrication tolerances. Full article
(This article belongs to the Special Issue Optical Fiber Sensors and Photonic Devices)
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Open AccessArticle
Temperature-Independent Gas Pressure Sensor with High Birefringence Photonic Crystal Fiber-Based Reflective Lyot Filter
Sensors 2019, 19(23), 5312; https://doi.org/10.3390/s19235312 - 02 Dec 2019
Abstract
A novel temperature-independent gas pressure sensor based on a reflective fiber Lyot filter is presented in this paper. The reflective fiber Lyot filter is simply consist of a fiber polarizer and a segment of hollow-core photonic bandgap fiber (HB-PCF). The HB-PCF plays the [...] Read more.
A novel temperature-independent gas pressure sensor based on a reflective fiber Lyot filter is presented in this paper. The reflective fiber Lyot filter is simply consist of a fiber polarizer and a segment of hollow-core photonic bandgap fiber (HB-PCF). The HB-PCF plays the role of birefringent cavity in the reflective fiber Lyot filter and works as the sensor head in the gas pressure sensor. Experiment results show that the responses of the sensor to gas pressure and temperature are 3.94 nm/MPa and −0.009 nm/°C, indicating that the proposed gas pressure is sensitive to gas pressure rather than temperature. Coupled with the advantages of simple structure, easy manufacture, high sensitivity and temperature independent, the proposed reflective fiber Lyot filter-based gas pressure sensor holds great potential application in the field of gas pressure monitoring. Full article
(This article belongs to the Special Issue Optical Fiber Sensors and Photonic Devices)
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Open AccessArticle
Simultaneous Temperature and Strain Measurements Using Polarization-Maintaining Few-Mode Bragg Gratings
Sensors 2019, 19(23), 5221; https://doi.org/10.3390/s19235221 - 28 Nov 2019
Abstract
Simultaneous measurement of temperature and strain was demonstrated using a polarization-maintaining few-mode Bragg grating (PM-FMF-FBG) based on the wavelength and phase modulation of the even L P 11 mode. The wavelength shift sensitivity and the interrogated phase sensitivity of the temperature and strain [...] Read more.
Simultaneous measurement of temperature and strain was demonstrated using a polarization-maintaining few-mode Bragg grating (PM-FMF-FBG) based on the wavelength and phase modulation of the even L P 11 mode. The wavelength shift sensitivity and the interrogated phase sensitivity of the temperature and strain were measured to be 10 pm·°C−1 and 0.73 pm·με−1 and −3.2 × 10−2 rad·°C−1 and 4 × 10−4 rad·με−1, respectively, with a discrimination efficiency of 98%. The polarization interference led to selective polarization excitation of the reflection spectra, and the calculated phase sensitivity agreed with the experimental results. Full article
(This article belongs to the Special Issue Optical Fiber Sensors and Photonic Devices)
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Open AccessArticle
OPTYRE—Real Time Estimation of Rolling Resistance for Intelligent Tyres
Sensors 2019, 19(23), 5119; https://doi.org/10.3390/s19235119 - 22 Nov 2019
Abstract
The study of the rolling tyre is a problem framed in the general context of nonlinear elasticity. The dynamics of the related phenomena is still an open topic, even though few examples and models of tyres can be found in the technical literature. [...] Read more.
The study of the rolling tyre is a problem framed in the general context of nonlinear elasticity. The dynamics of the related phenomena is still an open topic, even though few examples and models of tyres can be found in the technical literature. The interest in the dissipation effects associated with the rolling motion is justified by their importance in fuel-saving and in the context of an eco-friendly design. However, a general lack of knowledge characterizes the phenomenon, since not even direct experience on the rolling tyre can reveal the insights of the correlated different dissipation effects, as the friction between the rubber and the road, the contact kinematics and dynamics, the tyre hysteretic behaviour and the grip. A new technology, based on fibre Bragg grating strain sensors and conceived within the OPTYRE project, is illustrated for the specific investigation of the tyre dissipation related phenomena. The remarkable power of this wireless optical system stands in the chance of directly accessing the behaviour of the inner tyre in terms of stresses when a real-condition-rolling is experimentally observed. The ad hoc developed tyre model has allowed the identification of the instant grip conditions, of the area of the contact patch and allows the estimation of the instant dissipated power, which is the focus of this paper. Full article
(This article belongs to the Special Issue Optical Fiber Sensors and Photonic Devices)
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Open AccessArticle
Magnetic Field Sensor Based on a Tri-Microfiber Coupler Ring in Magnetic Fluid and a Fiber Bragg Grating
Sensors 2019, 19(23), 5100; https://doi.org/10.3390/s19235100 - 21 Nov 2019
Abstract
In this paper we propose and investigate a novel magnetic field sensor based on a Tri-microfiber coupler combined with magnetic fluid and a fiber Bragg grating (FBG) in a ring. A sensitivity of 1306 pm/mT was experimentally demonstrated in the range of magnetic [...] Read more.
In this paper we propose and investigate a novel magnetic field sensor based on a Tri-microfiber coupler combined with magnetic fluid and a fiber Bragg grating (FBG) in a ring. A sensitivity of 1306 pm/mT was experimentally demonstrated in the range of magnetic fields from 0 to 15 mT. The reflection peak in the output spectrum associated with the FBG serves as a reference point allowing to avoid ambiguity in determining the spectral shift induced by the magnetic field. Due to its high sensitivity at low magnetic fields, the proposed structure could be of high interest in low field biosensing applications that involve a magnetic field, such as magnetic manipulation or separation of biomolecules. Full article
(This article belongs to the Special Issue Optical Fiber Sensors and Photonic Devices)
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Open AccessArticle
Combination of an Axicon Fiber Tip and a Camera Device into a Sensitive Refractive Index Sensor
Sensors 2019, 19(22), 4911; https://doi.org/10.3390/s19224911 - 11 Nov 2019
Abstract
An axicon fiber tip combined with a camera device is developed to sensitively detect refractive indexes in solutions. The transparent axicon tips were made by etching optical fibers through a wet end-etching method at room temperature. When the axicon fiber tip was immersed [...] Read more.
An axicon fiber tip combined with a camera device is developed to sensitively detect refractive indexes in solutions. The transparent axicon tips were made by etching optical fibers through a wet end-etching method at room temperature. When the axicon fiber tip was immersed in various refractive index media, the angular spectrum of the emitted light from the axicon fiber tip was changed. Using a low numerical aperture lens to collect the directly transmitted light, a high intensity sensitivity was achieved when the tip cone angle was about 35 to 40 degrees. We combined the axicon fiber tip with a laser diode and a smartphone into a portable refractometer. The front camera of the smartphone was used to collect the light emitted from the axicon fiber tip. By analyzing the selected area of the captured images, the refractive index can be distinguished for various solutions. The refractive index sensitivity was up to 56,000%/RIU, and the detection limit was 1.79 × 10−5 RIU. By measuring the refractive index change via the axicon fiber tip, the concentration of different mediums can be sensitively detected. The detection limits of the measurement for sucrose solutions, saline solutions, and diluted wine were 8.86 × 10−3 °Bx, 0.12‰, and 0.35%, respectively. Full article
(This article belongs to the Special Issue Optical Fiber Sensors and Photonic Devices)
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