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Photonics
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Science and Applications of Optical Fiber Sensors: Recent Advances and...
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Science and Applications of Optical Fiber Sensors: Recent Advances and Future Trends

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: closed (31 August 2024) | Viewed by 3187

Special Issue Editors

Dr. Alex Dante

E-Mail Website
Guest Editor
Photonics Research Group – Optical Fiber Sensors Division, Institute for Advanced Studies, IEAv, São José dos Campos, Brazil
Interests: fiber-optic-based biosensors; chemical sensors; physical sensors; interrogation systems; electronic instrumentation
Dr. Quandong Huang

E-Mail Website
Guest Editor
School of Information Engineering, Guangdong University of Technology, Guangzhou, China
Interests: photonics devices; mode division multiplexing; optical fiber sensor
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Optical fiber sensors have revolutionized several branches of sensing technology due to some excellent properties intrinsic of optical fibers, such as immunity to electromagnetic interference, malleability, low weight, ease of use, handling and cabling, biocompatibility, and no need for power supplies at the sensing point. Thanks greatly to the revolution in telecommunications provided by low-loss optical fibers and solid-state optical power sources, off-the-shelf fiber-based sensors and sensing systems are being commercialized today for a multitude of applications ranging from structural health monitoring to biosensing. Nevertheless, new materials and technologies are helping the development and improvement of novel fiber-based sensors and systems at an ever-growing pace of innovation in response to challenges posed by new demands of a more sustainable, greener society. This Special Issue of Photonics addresses all types of optical fiber sensors and systems, from fundamentals to applications. We are inviting the submission of original papers and review papers reporting the latest advances in optical fiber sensing technology, including all types of biosensors, chemical sensors, gas sensors, physical sensors (temperature, strain, pressure, vibration, force, acceleration, landslide, structural health monitoring, electric and magnetic fields, electric currents and voltages, etc.).

Dr. Alex Dante
Dr. Quandong Huang
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 submissions that pass pre-check are 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. Photonics is an international peer-reviewed open access monthly journal published by MDPI.

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Published Papers (2 papers)

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Research

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23 pages, 7922 KiB  
Article
Development of Miniaturised Fibre-Optic Laser Doppler Velocimetry for Opaque Liquid: Measurement of the Velocity Profile in the Engine Oil Flow of a Lubrication System
by Tsutomu Tajikawa, Shimpei Kohri, Taiki Mouri, Takaichi Fujimi, Hiromasa Yamaguchi and Kenkichi Ohba
Photonics 2024, 11(9), 892; https://doi.org/10.3390/photonics11090892 - 22 Sep 2024
Viewed by 650
Abstract
This study developed a fibre-optic laser Doppler velocimetry sensor for use in opaque, high-temperature, and high-pressure fluid flows by inserting the fibre perpendicular to the main flow. The tip of the optical fibre was obliquely polished and chemically etched using a buffered hydrofluoric [...] Read more.
This study developed a fibre-optic laser Doppler velocimetry sensor for use in opaque, high-temperature, and high-pressure fluid flows by inserting the fibre perpendicular to the main flow. The tip of the optical fibre was obliquely polished and chemically etched using a buffered hydrofluoric acid solution, and a reflective mirror was deposited on the surface of the oblique fibre tip. Based on the results of the verification test using the rotating annular open channel, the fabrication conditions of the fibre tip were optimized for measuring the lubricating oil flow. The flow velocity profiles in the engine’s oil flow of the lubrication system during engine bench testing were measured. These velocity profiles were influenced by variations in the measurement position, oil temperature, and engine speed. The measurement accuracy of this sensor was compared with the volumetric flow rate obtained by cross-sectional area integration of the flow velocity profile, as measured using a Coriolis flowmeter, and the difference was within 1%. By combining computational simulation for flow and optical attenuation and particle scattering in light transmission through a working fluid, this fibre-optic sensor achieved a measurement volume of 200 microns in length and 200 microns in width at a distance of 900–1000 microns from the sensor. Full article
(This article belongs to the Special Issue Science and Applications of Optical Fiber Sensors: Recent Advances and Future Trends)
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Review

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12 pages, 3652 KiB  
Review
Mechanically Induced Long-Period Fiber Gratings and Applications
by Jiaqi Ran, Yarou Chen, Guanhua Wang, Zelan Zhong, Jiali Zhang, Ou Xu, Quandong Huang and Xueqin Lei
Photonics 2024, 11(3), 223; https://doi.org/10.3390/photonics11030223 - 29 Feb 2024
Cited by 3 | Viewed by 1885
Abstract
Long-period fiber gratings (LPFGs) functioning as band-reject filters have played a pivotal role in the realm of optical communication. Since their initial documentation in 1996, LPFGs have witnessed rapid advancements in areas such as optical sensing, the equalization of optical amplification, and optical [...] Read more.
Long-period fiber gratings (LPFGs) functioning as band-reject filters have played a pivotal role in the realm of optical communication. Since their initial documentation in 1996, LPFGs have witnessed rapid advancements in areas such as optical sensing, the equalization of optical amplification, and optical band-pass filtering, etc. The unique attributes of optical fiber-based grating, including their miniaturized size, cost-effectiveness, and immunity to electromagnetic interference, have contributed significantly to various sectors over the last two decades. This paper presents a review of the evolution of LPFGs, with a specific focus on the progression and current trends of mechanically induced long-period fiber gratings. It offers a concise overview of coupled-mode theory, the fabrication processes, the merits, and the limitations associated with mechanically induced LPFGs. Moreover, this review elucidates the application methodologies of mechanically induced LPFGs and anticipates future directions in this field. Full article
(This article belongs to the Special Issue Science and Applications of Optical Fiber Sensors: Recent Advances and Future Trends)
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