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Specialty Polymer Optical Fibers and Sensors
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Specialty Polymer Optical Fibers and Sensors

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

Deadline for manuscript submissions: closed (30 September 2021) | Viewed by 7964

Special Issue Editor

Dr. Getinet Woyessa

E-Mail Website
Guest Editor
DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, 2800 Lyngby, Denmark
Interests: specialty optical fibers; surface plasmon resonance; fiber Bragg gratings; fiber sensors; fiber sensing technologies; fiber lasers; supercontinuum sources
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the realm of fiber optic sensors, the interest in polymer optical fibers (POFs) has increased considerably because of their unique properties in comparison with glass-based fibers for sensing applications. Their biocompatibility, low processing temperature, large elastic strain limits, and low Young’s modulus are some of the distinctive features of POFs. Until now, several polymer materials have been investigated for POF fabrications, and numerous POF sensors have been developed. As a result of these, POFs have been increasingly applied in distinct fields, leading to the emergence of companies involved in the commercialization of POFs and POF sensors.

This Special Issue invites contributions of both original research and review articles, which are not currently under review elsewhere in other journals or conferences, covering the following topics:

  • Materials for POFs;
  • Specialty POF design and structure: multi-material fiber, dual-core, multi-core, solid-core hollow-core, microstructured;
  • POF fabrication methods;
  • Low loss POFs;
  • Post-processing POFs—etching, tapering, coating, cleaving, connectorization;
  • Grating inscription in POFs;
  • POF sensors: both single and multi-parameter sensors;
  • POF sensing technologies and devices;
  • Applications of POFs and POF sensors;
  • High sensitivity POF sensors;
  • Fast response time temperature and humidity POF sensors;
  • Reliable and stable POF sensors;
  • Long-term performance of POF grating sensors;
  • Packaging of polymer fiber sensors;
  • Commercialization of POF sensors.

Papers covering other topics that are relevant to the Special Issue topic are also welcome.

Dr. Getinet Woyessa
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.

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 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

  • polymer materials
  • specialty polymer fibers
  • fiber fabrication
  • fiber processing
  • fiber Bragg gratings
  • fiber optic sensors
  • multi-parameter sensors
  • sensing technologies and devices
  • commercialization

Published Papers (3 papers)

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Research

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14 pages, 5262 KiB  
Article
Fabrication Quality Assessment Based on the Coupling of a Dual-Core Microstructured Polymer Optical Fiber
by Amaia Berganza, Eneko Arrospide, Josu Amorebieta, Joseba Zubia and Gaizka Durana
Sensors 2021, 21(22), 7435; https://doi.org/10.3390/s21227435 - 09 Nov 2021
Cited by 2 | Viewed by 1520
Abstract
In this paper we report on the theoretical analysis and fabrication of a dual-core microstructured polymer optical fiber (mPOF) and demonstrate how the coupling characteristics of a dual-core mPOF may be a key factor to assess the quality of the fabrication process. The [...] Read more.
In this paper we report on the theoretical analysis and fabrication of a dual-core microstructured polymer optical fiber (mPOF) and demonstrate how the coupling characteristics of a dual-core mPOF may be a key factor to assess the quality of the fabrication process. The coupling characteristics of this fiber have been tested and, for comparison purposes, simulations regarding the effects of inaccuracies during the manufacturing process were carried out to evaluate the fabrication quality. Results indicate that theoretical, simulation and experimental data are in good agreement, which highlights the uniformity of the microstructure along the fiber and the quality of its fabrication process. In fact, the manufactured mPOF reached a coupling efficiency up to 95.26%, which makes this mPOF appealing for applications in which highly efficient power couplers are required. Full article
(This article belongs to the Special Issue Specialty Polymer Optical Fibers and Sensors)
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11 pages, 4314 KiB  
Communication
Humidity-Sensitive PMMA Fiber Bragg Grating Sensor Probe for Soil Temperature and Moisture Measurement Based on Its Intrinsic Water Affinity
by Heng Wang, Shixin Gao, Xiaoyu Yue, Xin Cheng, Qi Liu, Rui Min, Hang Qu and Xuehao Hu
Sensors 2021, 21(21), 6946; https://doi.org/10.3390/s21216946 - 20 Oct 2021
Cited by 15 | Viewed by 2271
Abstract
Soil moisture measurement is very important for soil system monitoring. Compared to the traditional thermo-gravimetric technique, which is time-consuming and can be only performed in labs, the optic-fiber technique has unique advantages, such as small size, remote application in fields, fast response time [...] Read more.
Soil moisture measurement is very important for soil system monitoring. Compared to the traditional thermo-gravimetric technique, which is time-consuming and can be only performed in labs, the optic-fiber technique has unique advantages, such as small size, remote application in fields, fast response time and immunity to electromagnetic fields. In this paper, the soil moisture is measured by using a polymer optical fiber Bragg grating (POFBG) probe with a packaged dimension of 40 mm × 15 mm × 8 mm. Due to the intrinsic water-absorbing property of poly (methyl methacrylate) (PMMA), optical fiber Bragg gratings based on PMMA have been widely investigated for humidity measurement. Taking advantage of this, a sensor based on the POFBG is investigated to verify the soil condition. The POFBG is protectively integrated inside a stainless-steel package. A window is opened with a thin polypropylene mat as a filter, which allows the air to go through but prevents the soil from going inside to pollute the POFBG. The sensor probe is embedded in soils with different gravimetric soil moisture contents (SMCs) ranging from 0% to 40% and, then, insulated by polyethylene films to minimize the impact from the external environment, showing an average temperature cross sensitivity of −0.080 nm/°C. For a constant temperature, an exponential relationship between the Bragg wavelength and the SMC is obtained. For the SMCs between 8% and 24%, linear relationships are presented showing a temperature-corresponded sensitivity between 0.011 nm/% and 0.018 nm/%. The maximal sensitivity is calculated to be 0.018 nm/% at 20 °C, which is 28 times as high as that in the previous work. For the SMC over 24%, the sensor becomes insensitive because of humidity saturation in the cavity of the sensor probe. Though temperature cross sensitivity is problematic for SMC measurement, the influence could be eliminated by integrating another humidity-insensitive temperature sensor, such as a silica FBG temperature sensor. Full article
(This article belongs to the Special Issue Specialty Polymer Optical Fibers and Sensors)
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Other

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13 pages, 3260 KiB  
Letter
Refractive Index Sensor Based on Double Side-Polished U-Shaped Plastic Optical Fiber
by Shumin Wang, Daming Zhang, Yan Xu, Siwen Sun and Xiaoqiang Sun
Sensors 2020, 20(18), 5253; https://doi.org/10.3390/s20185253 - 14 Sep 2020
Cited by 37 | Viewed by 3601
Abstract
A U-shaped double-side polished plastic optical fiber (POF) is demonstrated as a liquid refractive index (RI) sensor. The refractive index of glycerinum solutions is identified by the intensity detection on the bending and evanescent wave loss change. Heat treatment and mechanical polishing are [...] Read more.
A U-shaped double-side polished plastic optical fiber (POF) is demonstrated as a liquid refractive index (RI) sensor. The refractive index of glycerinum solutions is identified by the intensity detection on the bending and evanescent wave loss change. Heat treatment and mechanical polishing are adopted to form the symmetrical side-polished POF probe. The processing parameters are experimentally optimized on the power transmittance. The sensitivity of 1541%/RIU (Refractive Index Unit) can be obtained with a resolution of 5.35 × 10−4 in the scope of 1.33–1.39. The favorable temperature characteristic is proved to offer stable RI sensing from 20 to 50 °C. This simple POF sensor has potentials in low-cost visible light intensity RI detection. Full article
(This article belongs to the Special Issue Specialty Polymer Optical Fibers and Sensors)
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