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Fiber-Optic Sensors: Detection and Applications

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

Deadline for manuscript submissions: closed (4 June 2021) | Viewed by 12340

Special Issue Editors


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Guest Editor
Institute of Photonics and Electronics, ŪFE, The Czech Academy of Sciences, Chaberská 1014/57, 182 51 Praha 8 - Kobylisy, Czech Republic
Interests: optical micro/nanofiber devices; optical fiber sensors; specialty optical fibers; CO2 laser-based optical preforms shaping; high power fiber laser

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Guest Editor
Department of Electrical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
Interests: optical fiber devices; fiber sensor; fiber laser
Special Issues, Collections and Topics in MDPI journals
1. Research Center for Intelligent Sensing, Zhejiang Lab, Hangzhou 310000, China
2. College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
Interests: optical micro/nanofiber sensors; tactile sensors; wearable sensors; microfluidic sensors; optofluidic sensors
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Central Glass and Ceramic Research Institute, Kolkata, India

Special Issue Information

Within the last decade, optical-fiber-based sensors and their detection applications have attracted tremendous attention in the development of sensing technology and quickly grown to meet the needs of a commonality of industry, human, and environment. The optical fiber itself has proven to be a great candidate for sensing among other optical devices, owing to its impressive features such as high sensitivity, large dynamic range, and immunity to electromagnetic interference. Such features enable optical fiber to have multisensing capabilities, consequently pushing researchers to employ fiber sensors in a different configuration utilizing three common sensing parameters of wavelength, intensity, and phase shift. Meanwhile, the developments of fabrication of the spatiality microstructured optical fibers, together with the expansion of optoelectronic devices, have been pivotal in paving the way towards extending fiber sensor configurations and the range of fiber sensor applications.

In such a framework, this Special Issue aims to highlight the latest advances in fiber-optic sensor technology research and development. The fields of interest include but are not limited to engineering, medical, and environmental applications.

Dr. Ali A. Jasim
Prof. Sulaiman Wadi Harun
Dr. Lei Zhang
Dr. Mukul Chandra Mukul Chandra Paul
Guest Editors

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Keywords

  • Micro/nanofiber device sensors
  • Physical and mechanical sensors
  • Biochemical and medical sensors
  • Environmental and industrial sensors
  • Fiber Bragg grating sensors
  • Nanocomposite materials based photonic sensors
  • Specialty optical fiber sensors

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Published Papers (3 papers)

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Research

10 pages, 8405 KiB  
Communication
Ex-Vivo Measurement of the pH in Aqueous Humor Samples by a Tapered Fiber-Optic Sensor
by Ondřej Podrazký, Jan Mrázek, Jana Proboštová, Soňa Vytykáčová, Ivan Kašík, Šárka Pitrová and Ali A. Jasim
Sensors 2021, 21(15), 5075; https://doi.org/10.3390/s21155075 - 27 Jul 2021
Cited by 10 | Viewed by 2921
Abstract
A practical demonstration of pH measurement in real biological samples with an in-house developed fiber-optic pH sensor system is presented. The sensor uses 8-hydroxypyrene-1,3,6-trisulfonate (HPTS) fluorescent dye as the opto-chemical transducer. The dye is immobilized in a hybrid sol-gel matrix at the tip [...] Read more.
A practical demonstration of pH measurement in real biological samples with an in-house developed fiber-optic pH sensor system is presented. The sensor uses 8-hydroxypyrene-1,3,6-trisulfonate (HPTS) fluorescent dye as the opto-chemical transducer. The dye is immobilized in a hybrid sol-gel matrix at the tip of a tapered optical fiber. We used 405 nm and 450 nm laser diodes for the dye excitation and a photomultiplier tube as a detector. The sensor was used for the measurement of pH in human aqueous humor samples during cataract surgery. Two groups of patients were tested, one underwent conventional phacoemulsification removal of the lens while the other was subjected to femtosecond laser assisted cataract surgery (FLACS). The precision of the measurement was ±0.04 pH units. The average pH of the aqueous humor of patients subjected to FLACS and those subjected to phacoemulsification were 7.24 ± 0.17 and 7.31 ± 0.20 respectively. Full article
(This article belongs to the Special Issue Fiber-Optic Sensors: Detection and Applications)
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14 pages, 1090 KiB  
Article
On the Use of Embedded Fiber Optic Sensors for Measuring Early-Age Strains in Concrete
by K.K. Santos Silva, F.A.N. Silva, T. Mahfoud, A. Khelidj, A. Brientin, A.C. Azevedo, J.M.P.Q. Delgado and A.G. Barbosa de Lima
Sensors 2021, 21(12), 4171; https://doi.org/10.3390/s21124171 - 17 Jun 2021
Cited by 11 | Viewed by 3794
Abstract
Detailed information about concrete behavior in real structures is an important issue in controlling its performance during its service life, and the use of embedded sensors to obtain desired information such as temperature, onset of the cracking process and evolution of strains, has [...] Read more.
Detailed information about concrete behavior in real structures is an important issue in controlling its performance during its service life, and the use of embedded sensors to obtain desired information such as temperature, onset of the cracking process and evolution of strains, has gained the attention of the building concrete industry. Data obtained using this technology can provide valuable information for decision making about the need for corrective interventions that can ensure the integrity and safety of concrete structures for long period of time. This paper presents a review of the current state-of-the-art of embedded fiber optic sensors used to assess concrete information of a wide range of aspects, comprising: existing alternative technologies, characteristics and advantages, practical applications and future developments. Complementarily, the work presents preliminary results of the use of fiber optic sensors to automatically and continuously perform expansion readings of AAR in concrete elements that facilitate both the storage—with elimination of the usual interruptions for manual readings—and the availability of continuous results of expansion data that are not possible to obtain with usual AAR tests code reading recommendations. Full article
(This article belongs to the Special Issue Fiber-Optic Sensors: Detection and Applications)
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14 pages, 2813 KiB  
Communication
Fiber Bragg Grating Pressure Sensor Integrated with Epoxy Diaphragm
by Shiuh-Chuan Her and Shin-Zhong Weng
Sensors 2021, 21(9), 3199; https://doi.org/10.3390/s21093199 - 5 May 2021
Cited by 21 | Viewed by 4042
Abstract
A fiber Bragg grating (FBG) sensor integrated with an epoxy diaphragm was developed for the measurement of pressure and water level. The bending strain of a circular diaphragm induced by uniform pressure was transferred to the FBG sensor. The response of the FBG [...] Read more.
A fiber Bragg grating (FBG) sensor integrated with an epoxy diaphragm was developed for the measurement of pressure and water level. The bending strain of a circular diaphragm induced by uniform pressure was transferred to the FBG sensor. The response of the FBG sensor to the pressure was observed in terms of the Bragg wavelength shift which is linearly proportional to the strain. The effect of epoxy diaphragm thickness on the sensitivity and accuracy was investigated. The experimental results show that the sensitivity of FBG/epoxy diaphragm pressure sensor is decreasing with the increase of the diaphragm thickness. The sensitivities of the FBG pressure sensors with diaphragm thicknesses of 0.5 mm, 0.7 mm, and 1.0 mm were 175.5 pm/kPa, 89.5 pm/kPa, and 43.7 pm/kPa, respectively. The pressure measured by the proposed FBG sensor was compared with theoretical prediction and a close agreement was observed. Full article
(This article belongs to the Special Issue Fiber-Optic Sensors: Detection and Applications)
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