scholarly journals Optical Fiber Temperature Sensors and Their Biomedical Applications

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 2113 ◽  
Author(s):  
Paulo Roriz ◽  
Susana Silva ◽  
Orlando Frazão ◽  
Susana Novais
Keyword(s):  
Optical Fiber ◽  
Biomedical Applications ◽  
Point Of Care ◽  
High Sensitivity ◽  
Optical Fiber Sensors ◽  
Medical Diagnostics ◽  
Fiber Sensors ◽  
External Perturbations ◽  
Chemical Inertness

The use of sensors in the real world is on the rise, providing information on medical diagnostics for healthcare and improving quality of life. Optical fiber sensors, as a result of their unique properties (small dimensions, capability of multiplexing, chemical inertness, and immunity to electromagnetic fields) have found wide applications, ranging from structural health monitoring to biomedical and point-of-care instrumentation. Furthermore, these sensors usually have good linearity, rapid response for real-time monitoring, and high sensitivity to external perturbations. Optical fiber sensors, thus, present several features that make them extremely attractive for a wide variety of applications, especially biomedical applications. This paper reviews achievements in the area of temperature optical fiber sensors, different configurations of the sensors reported over the last five years, and application of this technology in biomedical applications.

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.

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.

Multilayered self-assembled optical fiber sensors for biomedical applications

2003 ◽  
Author(s):  
Jeffrey B. Mecham ◽  
Y. Kang ◽  
B. Davis ◽  
Francisco J. Arregui ◽  
Ignacio R. Matias ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Biomedical Applications ◽  
Optical Fiber Sensors ◽  
Fiber Sensors ◽  
Self Assembled

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 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.

scholarly journals Optical Fiber Sensors for Monitoring Railway Infrastructures: A Review towards Smart Concept

Symmetry ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2251
Author(s):  
Yung William Sasy Chan ◽  
Hua-Ping Wang ◽  
Ping Xiang
Keyword(s):  
Artificial Intelligence ◽  
Optical Fiber ◽  
Health Monitoring ◽  
Electromagnetic Interference ◽  
Critical Role ◽  
High Sensitivity ◽  
Optical Fiber Sensors ◽  
Fiber Sensors ◽  
Passenger Transportation ◽  
Easy Integration

Railway infrastructures have played a critical role to ensure the continuity of goods and passenger transportation in China. Under extreme loading and environmental conditions, railway structures are vulnerable to deterioration and failure, leading to the interruption of the whole transportation system. Several techniques have been used for the health monitoring of railway structures. Optical fiber sensors are the widely recognized technique due to their inherent advantages such as high sensitivity, anti-electromagnetic interference, light weight, tiny size, corrosion resistance, and easy integration and network configuration. This paper provides a state-of-the-art of optical fiber sensing technologies and their practical application in railway infrastructures. In addition, the strain transfer analysis of optical fiber sensors is described for parameter reflection. A smart concept for artificial intelligence contribution is also declared. Finally, existing and future prospects on smart concept-based optical fiber sensors for railway infrastructure are discussed. The study can provide useful guidance to understand the problems in artificial intelligence which contributed to the Structural Health Monitoring system of railway structures.

Real-time optical fiber sensors based on light diffusing microlens arrays

Lab on a Chip ◽  
2019 ◽  
Vol 19 (12) ◽  
pp. 2060-2070 ◽  
Author(s):  
Mohamed Elsherif ◽  
Rosalia Moreddu ◽  
Muhammad Umair Hassan ◽  
Ali K. Yetisen ◽  
Haider Butt
Keyword(s):  
Optical Fiber ◽  
Real Time ◽  
Optical Fibers ◽  
Immune Reaction ◽  
Biological Tissues ◽  
Optical Fiber Sensors ◽  
Medical Diagnostics ◽  
Microlens Arrays ◽  
Fiber Sensors

The applications of optical fibers are impeded in implantable medical diagnostics due to incompatibility with biological tissues, and immune reaction in vivo.

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