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Fiber Optics Sensor Technology and Its Applications
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Fiber Optics Sensor Technology and Its Applications

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

Deadline for manuscript submissions: closed (15 June 2023) | Viewed by 4094

Special Issue Editor

Prof. Dr. Xuping Zhang

E-Mail Website
Guest Editor
1. College of Engineering and Applied Sciences, Nanjing University, Gulou District, Nanjing 210093, China
2. Key Laboratory of Intelligent Optical Sensing and Manipulation, Ministry of Education, Nanjing University, Nanjing 210093, China
Interests: distributed optical fiber sensing and its applications

Special Issue Information

Dear Colleagues,

Recently, reports on optical fiber sensors with various applicatios have attracted more and more attention, such as applications in structural health monitoring, environmental monitoring, energy monitoring, high-speed long-distance telecommunication, ultrafast lasers, and so on. There has also been a growing interest in distributed optical fiber sensors which use various demodulation schemes, including optical time-domain reflectometry, optical frequency-domain reflectometry, and related schemes. Moreover, distributed optical fiber sensors can detect measurements all over the fiber and have the ability to monitor variations in the physical and chemical parameters (such as temperature and strain) with spatial continuity, which are advantegeous compared to traditional sensors that measure a single position.

This Special Issue, ”Fiber Optics and Sensor Technology”, welcomes submissions of original research or comprehensive reviews which report on the latest research progress and developments regarding sensing technologies using optical fiber sensors. 

Prof. Dr. Xuping Zhang
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 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.

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 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 interference
  • optical fiber sensors
  • optical time-domain reflectometry
  • Fiber Bragg gratings (FBGs)
  • optical fiber cables
  • dynamic vibration measurement
  • optical signal detection
  • applications of optical fiber sensors

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Published Papers (2 papers)

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Research

15 pages, 5778 KiB  
Article
Improved Optical Path Structure for Symmetric Demodulation Method in EFPI Fiber Optic Acoustic Sensors Using Wavelength Division Multiplexing
by Hao Chen, Chenggang Guan, Hui Lv, Can Guo and Shiyi Chai
Sensors 2023, 23(10), 4985; https://doi.org/10.3390/s23104985 - 22 May 2023
Cited by 4 | Viewed by 1594
Abstract
This paper presents a novel improvement in the optical path structure of a three-wavelength symmetric demodulation method applied to extrinsic Fabry–Perot interferometer (EFPI) fiber optic acoustic sensors. The traditional approach of using couplers to construct the phase difference in the symmetric demodulation method [...] Read more.
This paper presents a novel improvement in the optical path structure of a three-wavelength symmetric demodulation method applied to extrinsic Fabry–Perot interferometer (EFPI) fiber optic acoustic sensors. The traditional approach of using couplers to construct the phase difference in the symmetric demodulation method is replaced with a new approach that combines the symmetric demodulation algorithm with wavelength division multiplexing (WDM) technology. This improvement addresses the issue of a suboptimal coupler split ratio and phase difference, which can affect the accuracy and performance of the symmetric demodulation method. In an anechoic chamber test environment, the symmetric demodulation algorithm implemented with the WDM optical path structure achieved a signal-to-noise ratio (SNR) of 75.5 dB (1 kHz), a sensitivity of 1104.9 mV/Pa (1 kHz), and a linear fitting coefficient of 0.9946. In contrast, the symmetric demodulation algorithm implemented with the traditional coupler-based optical path structure achieved an SNR of 65.1 dB (1 kHz), a sensitivity of 891.75 mV/Pa (1 kHz), and a linear fitting coefficient of 0.9905. The test results clearly indicate that the improved optical path structure based on WDM technology outperforms the traditional coupler-based optical path structure in terms of sensitivity, SNR, and linearity. Full article
(This article belongs to the Special Issue Fiber Optics Sensor Technology and Its Applications)
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18 pages, 9950 KiB  
Article
High Sensitivity Temperature Sensing of Long-Period Fiber Grating for the Ocean
by Jiayi Qu, Hongxia Zhang, Xinyu Shi, Chuanxi Li, Dagong Jia, Tiegen Liu and Rongxin Su
Sensors 2023, 23(10), 4768; https://doi.org/10.3390/s23104768 - 15 May 2023
Cited by 3 | Viewed by 1933
Abstract
In this study, a new temperature sensor with high sensitivity was achieved by four-layer Ge and B co-doped long-period fiber grating (LPFG) based on the mode coupling principle. By analyzing the mode conversion, the influence of the surrounding refractive index (SRI), the thickness [...] Read more.
In this study, a new temperature sensor with high sensitivity was achieved by four-layer Ge and B co-doped long-period fiber grating (LPFG) based on the mode coupling principle. By analyzing the mode conversion, the influence of the surrounding refractive index (SRI), the thickness and the refractive index of the film on the sensitivity of the sensor is studied. When 10 nm-thick titanium dioxide (TiO2) film is coated on the surface of the bare LPFG, the refractive index sensitivity of the sensor can be initially improved. Packaging PC452 UV-curable adhesive with a high-thermoluminescence coefficient for temperature sensitization can realize high-sensitivity temperature sensing and meet the requirements of ocean temperature detection. Finally, the effects of salt and protein attachment on the sensitivity are analyzed, which provides a reference for the subsequent application. The sensitivity of 3.8 nm/°C in the range of 5–30 °C was achieved for this new sensor, and the resolution is about 0.00026 °C, which is over 20 times higher than ordinary temperature sensors. This new sensor meets the accuracy and range of general ocean temperature measurements and could be used in various marine monitoring and environmental protection applications. Full article
(This article belongs to the Special Issue Fiber Optics Sensor Technology and Its Applications)
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