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Optical Fiber Sensors for Chemical and Biomedical Applications
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Optical Fiber Sensors for Chemical and Biomedical Applications

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

Deadline for manuscript submissions: closed (20 March 2023) | Viewed by 13073

Special Issue Editors

Prof. Dr. Xinyong Dong

E-Mail Website
Guest Editor
School of Information Engineering, Guangdong University of Technology, Guangzhou 510006, China
Interests: optical fiber sensors; optical fiber lasers
Prof. Dr. Chi Chiu Chan

E-Mail Website
Guest Editor
Center for Smart Sensing System, Julong College, Shenzhen Technology University, Shenzhen 518118, China
Interests: optical fiber sensors; optical fiber biosensor

Special Issue Information

Dear Colleagues,

With the rapid development of industrialization as well as the growth of the world population, there is a great demand for environmental protection and healthcare management. Detection towards ecological environmental parameters and physiological parameters is thus brought to the forefront. Fiber-optic sensors have drawn considerable interest because of their unique properties of small dimensions, capability of multiplexing, chemical inertness, and immunity to electromagnetic fields, and have found wide applications. This Special Issue is addressed to all types of optical-fiber sensors designed for chemical and biomedical applications.

Prof. Dr. Xinyong Dong
Prof. Dr. Chi Chiu Chan
Guest Editors

Manuscript Submission Information

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Keywords

  • Keywords: optical fiber
  • chemical application
  • biomedical application
  • environmental monitoring
  • healthcare monitoring
  • wearable sensor

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Published Papers (5 papers)

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Research

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10 pages, 2893 KiB  
Communication
Ion-Imprinted Chitosan-Based Localized Surface Plasmon Resonance Sensor for Ni2+ Detection
by Xiujuan Zhong, Li Ma and Guolu Yin
Sensors 2022, 22(22), 9005; https://doi.org/10.3390/s22229005 - 21 Nov 2022
Cited by 5 | Viewed by 1939
Abstract
Heavy metals are important sources of environmental pollution and cause disease in organisms throughout the food chain. A localized surface plasmon resonance sensor was proposed and demonstrated to realize Ni2+ detection by using ion-imprinted chitosan. Au nanoparticles were coated on the multimode [...] Read more.
Heavy metals are important sources of environmental pollution and cause disease in organisms throughout the food chain. A localized surface plasmon resonance sensor was proposed and demonstrated to realize Ni2+ detection by using ion-imprinted chitosan. Au nanoparticles were coated on the multimode fiber to excite the local surface plasmon resonance, and Ni2+-imprinted chitosan was then functionalized by using the dip coating technique. Ethylene diamine tetra-acetic acid was used to release the Ni2+ ions and hence form countless voids. Ni2+ was refilled into the voids to increase the refractive index of the sensing material, thus realizing the measurement of Ni2+ by monitoring the wavelength shift in the localized surface plasmon resonant peak. The coating thickness of the Ni2+–chitosan gel was optimized to obtain greater sensitivity. Experimental results show that the proposed Ni2+ sensor has a sensitivity of 185 pm/μM, and the limit of detection is 0.512 μM. The comparison experiments indicated that the ion-imprinted chitosan has better selectivity than pure chitosan. Full article
(This article belongs to the Special Issue Optical Fiber Sensors for Chemical and Biomedical Applications)
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8 pages, 2785 KiB  
Communication
Ultra-High Sensitivity Ultrasonic Sensor with an Extrinsic All-Polymer Cavity
by Zongyu Chen, Bo Dong, Wobin Huang, Yunji Yi, Chichiu Chan, Shuangchen Ruan and Shaoyu Hou
Sensors 2022, 22(18), 7069; https://doi.org/10.3390/s22187069 - 19 Sep 2022
Cited by 2 | Viewed by 2059
Abstract
An ultra-high sensitivity ultrasonic sensor with an extrinsic all-polymer cavity is presented. The probe is constructed with a polymer ferrule and a polymer-based reflection diaphragm. A specially designed polymer cover is used to seal the cavity sensor head and apply pretension to the [...] Read more.
An ultra-high sensitivity ultrasonic sensor with an extrinsic all-polymer cavity is presented. The probe is constructed with a polymer ferrule and a polymer-based reflection diaphragm. A specially designed polymer cover is used to seal the cavity sensor head and apply pretension to the sensing diaphragm. It can be manufactured by a commercial 3D printer with good reproducibility. Due to its all-polymer structure and high coherence depth, the sensitivity of our proposed sensor is improved significantly compared with that of the other sensor structures. Its sensitivity is 189 times as great as that of the commercial standard ultrasonic sensor at the ultrasonic frequency of 50 KHz, and it has a good response to ultrasonic within the frequency range of 18.5 KHz–200 KHz. Full article
(This article belongs to the Special Issue Optical Fiber Sensors for Chemical and Biomedical Applications)
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15 pages, 4805 KiB  
Article
Ultra-High-Sensitivity Humidity Fiber Sensor Based on Harmonic Vernier Effect in Cascaded FPI
by Cheng Zhou, Yanjun Song, Qian Zhou, Jiajun Tian and Yong Yao
Sensors 2022, 22(13), 4816; https://doi.org/10.3390/s22134816 - 25 Jun 2022
Cited by 13 | Viewed by 2226
Abstract
In this study, an ultra-high-sensitivity fiber humidity sensor with a chitosan film cascaded Fabry–Perot interferometer (FPI) based on the harmonic Vernier effect (HVE) is proposed and demonstrated. The proposed sensor can break the limitation of the strict optical path length matching condition in [...] Read more.
In this study, an ultra-high-sensitivity fiber humidity sensor with a chitosan film cascaded Fabry–Perot interferometer (FPI) based on the harmonic Vernier effect (HVE) is proposed and demonstrated. The proposed sensor can break the limitation of the strict optical path length matching condition in a traditional Vernier effect (TVE) FPI to achieve ultra-high sensitivity through the adjustment of the harmonic order of the HVE FPI. The intersection of the internal envelope tracking method allows spectra demodulation to no longer be limited by the size of the FSR of the FPI. The sensitivity of the proposed sensor is −83.77 nm/%RH, with a magnification of −53.98 times. This work acts as an excellent guide in the fiber sensing field for the further achievement of ultra-high sensitivity. Full article
(This article belongs to the Special Issue Optical Fiber Sensors for Chemical and Biomedical Applications)
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10 pages, 3704 KiB  
Communication
Optical Fiber Interferometric Humidity Sensor by Using Hollow Core Fiber Interacting with Gelatin Film
by Yusong Zhong, Pengbai Xu, Jun Yang and Xinyong Dong
Sensors 2022, 22(12), 4514; https://doi.org/10.3390/s22124514 - 15 Jun 2022
Cited by 12 | Viewed by 2257
Abstract
An optical fiber Fabry–Perot interferometer (FPI) is constructed for relative humidity measurement by fusion splicing a short hollow core fiber (HCF) to the end of a single-mode fiber and coating the tip of the HCF with a layer of gelatin. The thickness of [...] Read more.
An optical fiber Fabry–Perot interferometer (FPI) is constructed for relative humidity measurement by fusion splicing a short hollow core fiber (HCF) to the end of a single-mode fiber and coating the tip of the HCF with a layer of gelatin. The thickness of the gelatin film changes with ambient humidity level and modulates cavity length of the FPI. Humidity measurement is therefore realized by measuring the wavelength shift of the interreference fringe. RH sensitivity of 0.192 nm/%RH is achieved within a measurement range of 20–80%RH. Dynamic measurement shows a response and recovery time of 240 and 350 ms, respectively. Sensor performance testing shows good repeatability and stability at room temperature but also reveals slight dependence of the RH sensitivity on environmental temperature. Therefore, a fiber Bragg grating is cascaded to the FPI sensing probe to monitor temperature simultaneously with temperature sensitivity of 10 pm/°C. Full article
(This article belongs to the Special Issue Optical Fiber Sensors for Chemical and Biomedical Applications)
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Review

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23 pages, 5220 KiB  
Review
Long-Period Fiber Grating Sensors for Chemical and Biomedical Applications
by Jintao Cai, Yulei Liu and Xuewen Shu
Sensors 2023, 23(1), 542; https://doi.org/10.3390/s23010542 - 3 Jan 2023
Cited by 23 | Viewed by 3913
Abstract
Optical fiber biosensors (OFBS) are being increasingly proposed due to their intrinsic advantages over conventional sensors, including their compactness, potential remote control and immunity to electromagnetic interference. This review systematically introduces the advances of OFBS based on long-period fiber gratings (LPFGs) for chemical [...] Read more.
Optical fiber biosensors (OFBS) are being increasingly proposed due to their intrinsic advantages over conventional sensors, including their compactness, potential remote control and immunity to electromagnetic interference. This review systematically introduces the advances of OFBS based on long-period fiber gratings (LPFGs) for chemical and biomedical applications from the perspective of design and functionalization. The sensitivity of such a sensor can be enhanced by designing the device working at or near the dispersion turning point, or working around the mode transition, or their combination. In addition, several common functionalization methods are summarized in detail, such as the covalent immobilization of 3-aminopropyltriethoxysilane (APTES) silanization and graphene oxide (GO) functionalization, and the noncovalent immobilization of the layer-by-layer assembly method. Moreover, reflective LPFG-based sensors with different configurations have also been introduced. This work aims to provide a comprehensive understanding of LPFG-based biosensors and to suggest some future directions for exploration. Full article
(This article belongs to the Special Issue Optical Fiber Sensors for Chemical and Biomedical Applications)
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