scholarly journals Optical Fiber Sensors for Metal Ions Detection Based on Novel Fluorescent Materials

2020 ◽  
Vol 8 ◽  
Author(s):  
Yi Cai ◽  
Ming Li ◽  
Minghao Wang ◽  
Jin Li ◽  
Ya-nan Zhang ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Metal Ions ◽  
Fluorescent Probes ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Optical Fiber Sensors ◽  
Fiber Sensors ◽  
Fluorescent Materials ◽  
Metal Ions Detection

Recently, novel fluorescent probes based on biomaterials and luminescent nanomaterials for metal ions attract tremendous attentions, owing to their advantages of simple operation, high sensitivity and rapid response for metals detection. Immobilized on the optical fiber sensor, fluorescent probes reveal the advantages while facing outdoor detection challenges. Therefore, numerous fluorescent optical fiber sensors for metal ions have been developed for online and in-situ detection to predict and prevent the environmental problems. Differ from refractometer-based fiber sensors, the structures of the fiber sensors based on fluorescent materials are usually simple, and the characters of the materials and the fabrication processes of fiber sensors are more significant to the sensing performances. This paper summarized the studies of optical fiber sensors for metal detection based on novel fluorescent materials to help researchers get the highlights of recent notable advancements and obtain the better potential prospects.

scholarly journals Carbon Allotrope-Based Optical Fibers for Environmental and Biological Sensing: A Review

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 2046 ◽  
Author(s):  
Stephanie Hui Kit Yap ◽  
Kok Ken Chan ◽  
Swee Chuan Tjin ◽  
Ken-Tye Yong
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
High Sensitivity ◽  
Optical Fiber Sensors ◽  
Functional Coating ◽  
Fiber Sensors ◽  
Carbon Allotrope ◽  
Carbon Allotropes ◽  
Sensing Technology ◽  
Wide Range

Recently, carbon allotropes have received tremendous research interest and paved a new avenue for optical fiber sensing technology. Carbon allotropes exhibit unique sensing properties such as large surface to volume ratios, biocompatibility, and they can serve as molecule enrichers. Meanwhile, optical fibers possess a high degree of surface modification versatility that enables the incorporation of carbon allotropes as the functional coating for a wide range of detection tasks. Moreover, the combination of carbon allotropes and optical fibers also yields high sensitivity and specificity to monitor target molecules in the vicinity of the nanocoating surface. In this review, the development of carbon allotropes-based optical fiber sensors is studied. The first section provides an overview of four different types of carbon allotropes, including carbon nanotubes, carbon dots, graphene, and nanodiamonds. The second section discusses the synthesis approaches used to prepare these carbon allotropes, followed by some deposition techniques to functionalize the surface of the optical fiber, and the associated sensing mechanisms. Numerous applications that have benefitted from carbon allotrope-based optical fiber sensors such as temperature, strain, volatile organic compounds and biosensing applications are reviewed and summarized. Finally, a concluding section highlighting the technological deficiencies, challenges, and suggestions to overcome them is presented.

Strain Analysis of Surface Bonded Optical Fiber Sensors

2011 ◽  
Vol 121-126 ◽  
pp. 4166-4170
Author(s):  
Shiuh Chuan Her ◽  
Chang Yu Tsai
Keyword(s):  
Optical Fiber ◽  
Electromagnetic Interference ◽  
Optical Fiber Sensor ◽  
Strain Analysis ◽  
Adhesive Layer ◽  
Optical Fiber Sensors ◽  
Fiber Sensor ◽  
Fiber Sensors ◽  
Theoretical Predictions ◽  
Host Structure

Optical fiber sensors with light weight, small size and immunity to electromagnetic interference have been found to be a promising device for use in the development of smart structures. It is well known that the strain transfer from the host structure to the optical fiber sensor is dependent on the bonding characteristics such as adhesive layer and bonded length. In this investigation, the optical fiber sensor is surface bonded on the host structure. A theoretical model consisting of the optical fiber, adhesive layer and host material, is proposed to determine the strain in the optical fiber sensor induced by the host structure. The theoretical predictions were validated with the numerical analysis using the finite element method.

scholarly journals Distributed Optical Fiber Sensor Applications in Geotechnical Monitoring

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7514
Author(s):  
Aldo Minardo ◽  
Luigi Zeni ◽  
Agnese Coscetta ◽  
Ester Catalano ◽  
Giovanni Zeni ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Brillouin Scattering ◽  
Optical Fiber Sensor ◽  
Early Warning Systems ◽  
Optical Fiber Sensors ◽  
Small Scale ◽  
Sudden Increase ◽  
Fiber Sensors ◽  
Artificial Rainfall ◽  
Distributed Optical Fiber

We report the experimental application of distributed optical fiber sensors, based on stimulated Brillouin scattering (SBS), to the monitoring of a small-scale granular slope reconstituted in an instrumented flume and subjected to artificial rainfall until failure, and to the monitoring of a volcanic rock slope. The experiments demonstrate the sensors’ ability to reveal the sudden increase in soil strain that foreruns the failure in a debris flow phenomenon, as well as to monitor the fractures in the tuff rocks. This study offers an important perspective on the use of distributed optical fiber sensors in the setting up of early warning systems for landslides in both rock and unconsolidated materials.

scholarly journals Post-processing algorithms for distributed optical fiber sensing in structural health monitoring applications

2020 ◽  
pp. 147592172092155 ◽  
Author(s):  
Mattia Francesco Bado ◽  
Joan Ramon Casas ◽  
Judit Gómez
Keyword(s):  
Structural Health Monitoring ◽  
Optical Fiber ◽  
Health Monitoring ◽  
Optical Fiber Sensors ◽  
Post Processing ◽  
Monitoring Tool ◽  
Fiber Sensors ◽  
Structural Health ◽  
Distributed Optical Fiber

Distributed optical fiber sensors are measuring tools whose potential related to the civil engineering field has been discovered in the latest years only (reduced dimensions, easy installation process, lower installation costs, elevated reading accuracy, and distributed monitoring). Yet, what appears clear from numerous in situ distributed optical fiber sensors monitoring campaigns (bridges and historical structures among others) and laboratory confined experiments is that optical fiber sensors monitorings have a tendency of including in their outputs a certain amount of anomalistic readings (out of scale and unreliable measurements). These can be both punctual in nature and spread over all the monitoring duration. Their presence strongly affects the results both altering the data in its affected sections and distorting the overall trend of the strain evolution profiles, thus the importance of detecting, eliminating, and substituting them with correct values. Being this issue intrinsic in the raw output data of the monitoring tool itself, its only solution is computer-aided post-processing of the strain data. This article discusses different simple algorithms for getting rid of such disruptive anomalies using two methods previously used in the literature and a novel polynomial-based one with different levels of sophistication and accuracy. The viability and performance of each are tested on two study case scenarios: an experimental laboratory test on two reinforced concrete tensile elements and an in situ tunnel monitoring campaign. The outcome of such analysis will provide the reader with both clear indications on how to purge a distributed optical fiber sensors-extracted data set of all anomalies and on which is the best-suited method according to their needs. This marriage of computer technology and cutting edge structural health monitoring tool not only elevates the distributed optical fiber sensors viability but also provides civil and infrastructures engineers a reliable tool to perform previously unreachable levels of accuracy and extension monitoring coverage.

Development of Smart Composite Panel with Optical Fiber Sensors

2005 ◽  
Vol 297-300 ◽  
pp. 659-664
Author(s):  
Hideaki Murayama ◽  
Kazuro Kageyama ◽  
Isamu Ohsawa ◽  
Makoto Kanai ◽  
Kiyhoshi Uzawa ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Composite Structures ◽  
Optical Fiber Sensor ◽  
Optical Fiber Sensors ◽  
Vibration Sensor ◽  
Composite Panel ◽  
Fiber Sensor ◽  
Smart Composite ◽  
Fiber Sensors ◽  
Distributed Sensors

We have developed a novel fiber-optic vibration sensors and applied commercially available strain and temperature sensors to health monitoring of composite structures. In this study, we constructed an optical fiber network integrating four types of optical fiber sensor into a carbon reinforced plastic (CFRP) panel. These four sensors were the vibration sensor developed by our laboratory, two distributed sensors based on Brillouin and Raman backscattering and Fiber Bragg Grating (FBG) sensors. By dealing the data obtained from the measurement systems corresponding to these four sensors, strain/stress and temperature distributions throughout the panel can be monitored. Vibration and elastic waves transmitting on the panel are also detected at several sensing points. Furthermore, we will be able to determine damage locations and modes by processing the wave signals. To make the panel with the optical fiber sensor network more sensitive and smarter, we are developing some techniques that can improve the performance of the sensors and can assess the structural integrity by analyzing measurement results. In this paper, the development of the first generation of our smart composite panel with the optical fiber sensors is described and the techniques making the panel more sensitive and smarter are also described.

Simultaneous In Situ Measurement of Temperature and Relative Humidity in a PEMFC Using Optical Fiber Sensors

2010 ◽  
Vol 157 (8) ◽  
pp. B1173 ◽  
Author(s):  
N. A. David ◽  
P. M. Wild ◽  
J. Jensen ◽  
T. Navessin ◽  
N. Djilali
Keyword(s):  
Relative Humidity ◽  
Optical Fiber ◽  
Optical Fiber Sensors ◽  
In Situ Measurement ◽  
Fiber Sensors

Incorporating Optical Fiber Sensors into Fabrics

2005 ◽  
Vol 870 ◽  
Author(s):  
A. Dhawan ◽  
T. K. Ghosh ◽  
J. F. Muth
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Electromagnetic Interference ◽  
High Sensitivity ◽  
Optical Fiber Sensors ◽  
Fiber Sensors ◽  
Nonwoven Fabrics ◽  
Micron Diameter ◽  
Environmental Robustness ◽  
Alternative Processes

Optical fiber sensors have many attractive attributes including high sensitivity, environmental robustness, immunity to electromagnetic interference, and the ability to be remotely interrogated. Furthermore, by incorporating optical fibers into woven and nonwoven fabrics these sensors can be distributed across large areas. In woven optical fibers, microscopic bending is an issue due to the fibers going over and under the yarns. Microscopic and macroscopic bending losses are quantified by placing optical fibers on frames of different radii of curvature and measuring the loss of transmitted light. As an example of the non-woven process, electrospinning was used to overlay a net of sub-micron diameter fibers over the optical fibers. This protects the optical fiber, holds it in place, while still permitting flexibility. To form chemical sensors, standard telecommunications grade optical fibers were tapered such that the evanescent wave extended into the environment. Coating the fibers with a thin layer of gold then permits surface plasmon sensors to be formed. However, the resulting sensors were very fragile and hard to place into fabrics. As a result alternative processes were developed that form fiber structures that are robust enough to withstand textile manufacturing processes yet still allow interaction with the environment.

scholarly journals A Review of Coating Materials Used to Improve the Performance of Optical Fiber Sensors

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4215
Author(s):  
Changxu Li ◽  
Wenlong Yang ◽  
Min Wang ◽  
Xiaoyang Yu ◽  
Jianying Fan ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Optical Materials ◽  
Rapid Development ◽  
High Sensitivity ◽  
Optical Fiber Sensors ◽  
Coating Materials ◽  
Fiber Sensors ◽  
Specific Recognition ◽  
Thermal Expansion Coefficients

In order to improve the performance of fiber sensors and fully tap the potential of optical fiber sensors, various optical materials have been selectively coated on optical fiber sensors under the background of the rapid development of various optical materials. On the basis of retaining the original characteristics of the optical fiber sensors, the coated sensors are endowed with new characteristics, such as high sensitivity, strong structure, and specific recognition. Many materials with a large thermal optical coefficient and thermal expansion coefficients are applied to optical fibers, and the temperature sensitivities are improved several times after coating. At the same time, fiber sensors have more intelligent sensing capabilities when coated with specific recognition materials. The same/different kinds of materials combined with the same/different fiber structures can produce different measurements, which is interesting. This paper summarizes and compares the fiber sensors treated by different coating materials.

A Long Cylindrical Optical Fiber Sensor Based on Multiple Total Internal Reflections in Heterodyne Interferometry

2014 ◽  
Vol 530-531 ◽  
pp. 3-6
Author(s):  
Shinn Fwu Wang ◽  
Ming Jen Wang ◽  
Jyh Shyan Chiu
Keyword(s):  
Refractive Index ◽  
Phase Shift ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Fiber Sensor ◽  
Heterodyne Interferometry ◽  
Fiber Sensors ◽  
Biochemical Sensing ◽  
Real Time Measurement

In this paper, a long cylindrical multimode optical fiber sensor (OFS) based on multiple total internal reflections in heterodyne interferometry is proposed. The cladding of the sensing portions of the fiber sensors is removed, but dont be coated with any metal films. With the OFS the phase shift difference due to the multiple total internal reflections (MTIRs) effect between the p-and s-polarizations can be measured by using the heterodyne interferometry. Substituting the phase shift difference into Fresnels equations, the refractive index for the tested medium can be calculated. According to numerical simulations and experimental results, the long cylindrical OFS is with the best resolution of 0.0000028 refractive index unit (RIU). However, the OFS could be valuable for chemical, biological and biochemical sensing. It has some merits, such as, high sensitivity, high resolution, stability, small size and in real-time measurement.

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