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Polymer Optical Fiber Sensors and Sensing Technologies
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Polymer Optical Fiber Sensors and Sensing Technologies

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

Deadline for manuscript submissions: closed (20 July 2022) | Viewed by 5458

Special Issue Editors

Dr. Nélia J. Alberto

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Guest Editor
Instituto de Telecomunicações, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
Interests: optical fiber sensors; fiber Bragg gratings; Fabry-Perot interferometers; fiber sensors applications; biosensing
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Paulo André

E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering and Instituto de Telecomunicações, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisbon, Portugal
Interests: study and simulation of optoelectronics components; fiber Bragg gratings; integrated optics in sol-gel substrates; passive optical networks; big data processing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent years, polymer optical fibers (POFs) have been proven to be an excellent alternative to conventional silica fibers. As a result of its significant advantages, including high elastic strain limits, high fracture toughness, and high flexibility in bending, this technology has been increasingly applied in distinct fields from structural health monitoring to environmental sensing. Additionally, the excellent compatibility of polymers with organic materials means there is great potential for biomedical applications.

This Special Issue will focus on the current state of the art of polymer optical fiber, covering recent technological improvements from special fibers to new devices/sensors and emerging applications. Original research papers, short communications, and review articles describing the current state of the art in this research field are welcome. We hope that this Special Issue will provide you with an overview of the present status and future outlook of the aforementioned topics. 

Dr. Nélia J. Alberto
Prof. Dr. Paulo André
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.

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Published Papers (2 papers)

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10 pages, 2007 KiB  
Article
Improving Measurement Range of a Swellable Polymer-Clad Plastic Fiber Optic Humidity Sensor by Dye Addition
by Yuta Shimura, Yutaka Suzuki and Masayuki Morisawa
Sensors 2022, 22(16), 6315; https://doi.org/10.3390/s22166315 - 22 Aug 2022
Cited by 6 | Viewed by 1908
Abstract
Humidity measurement is required in various fields. We previously developed a sensor that leverages the sudden change in the transmitted light intensity when switching from leakage mode to waveguide mode. By adjusting the low-refractive-index polymer of the cladding, we achieved measurements at 60% [...] Read more.
Humidity measurement is required in various fields. We previously developed a sensor that leverages the sudden change in the transmitted light intensity when switching from leakage mode to waveguide mode. By adjusting the low-refractive-index polymer of the cladding, we achieved measurements at 60% RH. However, for practical use, measurements at low humidity are essential. Therefore, in this study, we developed a sensor using a leakage mode that enables measurements at low humidity. To measure the leakage mode, it is necessary to increase the absorbance of the cladding and the incident angle at the core–cladding interface. Therefore, we developed a sensor in which the core was stretched, and the cladding was doped with a high concentration of dye. The experimental results confirmed that a sensor with a polymer concentration of 4% and a dye concentration of 3% could measure from 0% RH to 95% RH. The sensitivity was 0.1 dB/% RH from 0% RH to 70% RH and 0.32 dB/% RH from 70% RH to 95% RH. The estimated response time for a change from 10% to 90% light transmission for a sensor with 4% polymer concentration and 0.5% dye concentration was 22 s from 45% RH to 0% RH and 50 s from 0% RH to 45% RH. Full article
(This article belongs to the Special Issue Polymer Optical Fiber Sensors and Sensing Technologies)
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11 pages, 3944 KiB  
Letter
Polycarbonate mPOF-Based Mach–Zehnder Interferometer for Temperature and Strain Measurement
by Xiaoyu Yue, Haijin Chen, Hang Qu, Rui Min, Getinet Woyessa, Ole Bang and Xuehao Hu
Sensors 2020, 20(22), 6643; https://doi.org/10.3390/s20226643 - 20 Nov 2020
Cited by 7 | Viewed by 2788
Abstract
In this paper, an endlessly single mode microstructured polymer optical fiber (mPOF) in a Mach–Zehnder (M–Z) interferometer configuration is demonstrated for temperature and strain measurement. Because there is no commercial splicer applied for POF-silica optical fiber (SOF) connectorization, prior to the M–Z interferometric [...] Read more.
In this paper, an endlessly single mode microstructured polymer optical fiber (mPOF) in a Mach–Zehnder (M–Z) interferometer configuration is demonstrated for temperature and strain measurement. Because there is no commercial splicer applied for POF-silica optical fiber (SOF) connectorization, prior to the M–Z interferometric sensing, we introduce an imaging projecting method to align a polycarbonate mPOF to a SOF and then the splice is cured permanently using ultraviolet (UV) glue. A He-Ne laser beam at 632.8 nm coupled in a SOF is divided by a 1 × 2 fiber coupler to propagate in two fiber arms. A piece of mPOF is inserted in one arm for sensing implementation and the interference fringes are monitored by a camera. For non-annealed fiber, the temperature sensitivity is found to be 25.5 fringes/°C for increasing temperature and 20.6 fringes/°C for decreasing temperature. The converted sensitivity per unit length is 135.6 fringes/°C/m for increasing temperature, which is twice as much as the silica fiber, or 852.2 rad/°C/m (optical phase change versus fiber temperature), which is more than four times as much as that for the PMMA fiber. To solve the sensitivity disagreement, the fiber was annealed at 125 °C for 36 h. Just after the thermal treatment, the temperature measurement was conducted with sensitivities of 16.8 fringes/°C and 21.3 fringes/°C for increasing and decreasing process, respectively. One month after annealing, the linear response was improved showing a temperature sensitivity of ~20.7 fringes/°C in forward and reverse temperature measurement. For the strain measurement based on non-annealed fiber, the sensitivity was found to be ~1463 fringes/%ε showing repeatable linear response for forward and reverse strain. The fiber axial force sensitivity was calculated to be ~2886 fringes/N, showing a force measurement resolution of ~3.47 × 10−4 N. The sensing methodology adopted in this work shows several advantages, such as very low cost, high sensitivity, a straightforward sensing mechanism, and ease of fabrication. Full article
(This article belongs to the Special Issue Polymer Optical Fiber Sensors and Sensing Technologies)
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