The influence of concentration of Nd-Fe-B powder in composite coating of optical fiber to the sensibility to external magnetic field

Multi-mode optical fiber with magnetic composite coating was investigated as an optical fiber sensor element (OFMSE) for magnetic field sensing The composite coating was formed with dispersions of permanent magnet powder of Nd-Fe-B in poly (ethylene-co-vinyl acetate)-EVA solutions in toluene. The influence of the applied external magnetic field on the change of intensity of the light signal propagate trough developed optical fibers sensor element was investigated. In this paper the influence of the content of magnetic powder in the composite coating on the optical propagation characteristics of optical fiber were particularly investigated.

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An Analytical Model for Describing the Power Coupling Ratio between Multimode Fibers with Transverse Displacement and Angular Misalignment in an Optical Fiber Bend Sensor

Sensors ◽

10.3390/s19224968 ◽

2019 ◽

Vol 19 (22) ◽

pp. 4968

Author(s):

Wern Kam ◽

Yong Sheng Ong ◽

Sinead O’Keeffe ◽

Waleed S. Mohammed ◽

Elfed Lewis

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Theoretical Calculations ◽

Optical Fiber Sensor ◽

Coupling Efficiency ◽

Transverse Displacement ◽

Coupling Ratio ◽

Angular Misalignment ◽

Multimode Fibers ◽

Power Coupling

The power coupling ratio between step-index multimode fibers caused by combined transversal and angular misalignment is calculated. A theoretical description of the coupling efficiency between two optical fibers based on geometrical optics is provided. The theoretical calculations are collaborated by experiments, determining the power coupling ratio between three output fibers with an axial offset and angular misalignment with a single input fiber. The calculation results are in good agreement with experimental results obtained using a previously fabricated optical fiber sensor for monitoring physiological parameters in clinical environments. The theoretical results are particularly beneficial for optimizing the design of optical fiber bending sensors that are based on power coupling loss (intensity) as the measurement interrogation requires either axial displacement, angular misalignment, or both.

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Comparative Experimental Study of a High-Temperature Raman-Based Distributed Optical Fiber Sensor with Different Special Fibers

Sensors ◽

10.3390/s19030574 ◽

2019 ◽

Vol 19 (3) ◽

pp. 574 ◽

Cited By ~ 10

Author(s):

Ismail Laarossi ◽

María Quintela-Incera ◽

José López-Higuera

Keyword(s):

Experimental Study ◽

High Temperature ◽

Optical Fiber ◽

Optical Fibers ◽

Optical Fiber Sensor ◽

Time Domain Reflectometry ◽

Fiber Sensor ◽

Mechanical Resistance ◽

Distributed Optical Fiber Sensor ◽

Distributed Optical Fiber

An experimental study of a high temperature distributed optical fiber sensor based on Raman Optical-Time-Domain-Reflectometry (ROTDR) (up to 450 °C) and optical fibers with different coatings (polyimide/carbon, copper, aluminum and gold) is presented. Analysis of the distributed temperature sensor (DTS) measurements determined the most appropriate optical fiber to be used in high temperature industrial environment over long periods of time. To demonstrate the feasibility of this DTS for an industrial application, an optical cable was designed with the appropriate optical fiber and it was hermetically sealed to provide the required mechanical resistance and isolate the fiber from environmental degradations. This cable was used to measure temperature up to 360 °C of an industrial furnace during 7 days.

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Self-standing magnetic composite nanosheets prepared in the presence of an external magnetic field: Characterization and potential for medical applications

Journal of Chemical Research ◽

10.1177/1747519820958604 ◽

2020 ◽

pp. 174751982095860

Author(s):

Mina Sakuragi ◽

Yoshikazu Takahashi ◽

Keito Ehara ◽

Katsuki Kusakabe

Keyword(s):

Magnetic Field ◽

Thermal Decomposition ◽

External Magnetic Field ◽

Decomposition Method ◽

Sol Gel ◽

Magnetic Composite ◽

Magnetic Response ◽

Gel Method ◽

Sol Gel Method ◽

Thermal Decomposition Method

The aim of this study is to develop self-standing, ultrathin film, nanosheets with high magnetic response for use in a medical device that can be migrated to a target location in the body by using an external magnetic field. First, iron oxide nanoparticles are synthesized by either the sol-gel method or thermal decomposition. The resulting magnetic properties of the nanoparticles show that the thermal decomposition method provides a greater saturation magnetization value than the sol-gel method. Next, the nanoparticles obtained by the thermal decomposition method are embedded into nanosheets of poly(L-lactide) at varying concentrations. Embedding of the nanoparticles in the composite nanosheets is achieved by the application of an external magnetic field. The composite nanosheets are then characterized. The thickness of the nanosheet increases, and the nanoparticles are well dispersed, with an increase in poly (L-lactide) concentration. The NP-embedded nanosheets are imaged by transmission electron microscopy, which reveals thin, long aggregates aligned in collinear line features. X-ray diffraction results indicate that the magnetic hard axis of the nanoparticles in the nanosheets is aligned in parallel to the plane of the nanosheet by magnetic field application during nanosheet preparation. In addition, the nanosheets at high poly (L-lactide) concentrations that had been subjected to a magnetic field during preparation show a slightly greater magnetic response compared with both nanosheets without magnetic field exposure and nanosheets prepared at low poly (L-lactide) concentrations.

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Integrated Fiber Optic Sensors For Nondestructive Characterization Of Concrete Structures

MRS Proceedings ◽

10.1557/proc-503-107 ◽

1997 ◽

Vol 503 ◽

Author(s):

F. Ansari

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Fiber Optic ◽

Optical Fiber Sensor ◽

Fiber Optic Sensors ◽

Fiber Sensors ◽

Fully Integrated ◽

Integrated Optical ◽

Concrete Elements

ABSTRACTIt is possible to monitor the initiation and progress of various mechanical or environmentally induced perturbations in concrete elements by way of fully integrated optical fiber sensors. Geometric adaptability and ease by which optical fibers can be embedded within concrete elements has led to the development of a number of innovative applications for concrete elements. This article is intended for a brief introduction into the theories, principles, and applications of fiber optic sensors as they pertain to applications in concrete.. However, due to the fact that the transduction mechanism in optical fibers is invariant of the materials employed, the principles introduced here also correspond to other structural materials. The only application related differences among various materials pertain to sensitivity and choice of optical fiber sensor types.

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Smartphone-Based Optical Fiber Sensor for the Assessment of a Fed-Batch Bioreactor

Engineering Proceedings ◽

10.3390/ecsa-7-08157 ◽

2020 ◽

Vol 2 (1) ◽

pp. 26

Author(s):

Marco César Prado Soares ◽

Thiago Destri Cabral ◽

Pedro Machado Lazari ◽

Matheus dos Santos Rodrigues ◽

Gildo Santos Rodrigues ◽

...

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Sucrose Concentration ◽

Low Cost ◽

Optical Fiber Sensor ◽

Refraction Index ◽

Fed Batch ◽

Pixel Intensity ◽

Batch Bioreactor ◽

Sensing Platform

Industry is currently in a period of great expansion, the so-called “Industry 4.0”. This period relies on the development of new sensor technologies for the generation of systems capable of collecting, distributing, and delivering information. Particularly in chemical and biochemical industries, the development of portable monitoring devices can improve many process parameters, such as safety and productivity. In this work, the design of a smartphone-based optical fiber sensing platform for the online assessment of fed-batch fermentation systems is reported. The setup is comprised of a smartphone equipped with a 3D-printed case that couples optical fibers to the phone, and of an application for collecting images from the camera and then analyzing the pixel intensity. Finally, the obtained intensities are correlated to the broth refraction index, which is function of the sucrose concentration. We calculated the sensitivity of this sensor as 85.83 RIU−1 (refractive index units), and then compared its performance to results obtained with a handheld refractometer and with Monod model predictions. It showed to be a reliable, portable, and low-cost instrument for the online monitoring of bioreactors that can be easily reproducible on-site by simply printing it.

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Stress optical fiber sensor using light coupling between two laterally fused multimode optical fibers

Applied Optics ◽

10.1364/ao.37.003417 ◽

1998 ◽

Vol 37 (16) ◽

pp. 3417 ◽

Cited By ~ 8

Author(s):

Rachid Gafsi ◽

Pierre Lecoy ◽

Abdelrafik Malki

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Optical Fiber Sensor ◽

Fiber Sensor ◽

Light Coupling

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A ferrofluid infiltrated polymeric microstructured optical fiber sensor for magnetic field measurements

IEEE Photonics Conference 2012 ◽

10.1109/ipcon.2012.6358835 ◽

2012 ◽

Cited By ~ 2

Author(s):

Alessandro Candiani ◽

Alexander Argyros ◽

Richard Lwin ◽

Sergio Leon-Saval ◽

Gianluigi Zito ◽

...

Keyword(s):

Magnetic Field ◽

Optical Fiber ◽

Optical Fiber Sensor ◽

Field Measurements ◽

Fiber Sensor ◽

Microstructured Optical Fiber ◽

Magnetic Field Measurements

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The Effect of Low-Intensity Static Magnetic Field on Ni-P-PTFE Electroless Composite Plating Coatings

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.717.112 ◽

2016 ◽

Vol 717 ◽

pp. 112-117

Author(s):

Jun Ying Hou ◽

Hong Jiang Gao ◽

Xiao Lin Liu ◽

Yu Jiao ◽

Li Liu

Keyword(s):

Magnetic Field ◽

External Magnetic Field ◽

Field Strength ◽

Composite Coating ◽

Magnetic Field Strength ◽

Composite Coatings ◽

Magnetic Field Direction ◽

Composite Plating ◽

External Magnetic Field Strength ◽

New Processing

A new processing concept has been developed to produce Ni-P-PTFE electroless composite coating. This method combines magnetic field and electroless composite plating techniques to prepare high-quality Ni-P-PTFE electroless composite coating. The influence of magnetic on composite plating process and coatings performance by changing some factors such as the plating time, magnetic field strength, magnetic field direction. The results indicate that the external magnetic field improved deposition rate and the PTFE particles content of composite coatings, meanwhile, some performances of composite coating like thickness, corrosion resistance, were effected by external magnetic field strength. Therefore, the method combines magnetic field and electroless completing techniques had a wide application prospect in the aspect of improving the properties of electroless composite coating.

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Stress Analysis of Composite Material Embedded with Optical Fiber Sensor

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.326-328.59 ◽

2006 ◽

Vol 326-328 ◽

pp. 59-62

Author(s):

Shiuh Chuan Her ◽

Bo Ren Yao

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Electromagnetic Interference ◽

Optical Fiber Sensor ◽

Local Stress ◽

Smart Structure ◽

Fiber Optic Sensor ◽

Host Material ◽

Concentric Cylinders ◽

Host Structure

Fiber optic sensor with small size, light weight and immunity to electromagnetic interference can be embedded and integrated into the host material to form a smart structure system. One must recognize that optical fibers are foreign entities to the host structure, therefore will alter the stress state in the vicinity of the embedded sensor irrespective of the small size of the fiber. This is a result of the material and geometric discontinuity introduced by the embedded optical fiber. In this study, the local stress fields in the vicinity of the embedded fiber are examined. The host material is considered to be a composite with reinforced fiber parallel to the optical fiber. The geometry in the vicinity of the embedded fiber is modeled by four concentric cylinders which represent the optical fiber, protective coating, resin and host material, respectively. In this investigation, the host structure is subjected to longitudinal normal stress and transverse hydro-static stress. The effects of the coating and host material on the stress distribution in the vicinity of the embedded optical fiber are presented through a parametric study.

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