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Showing 1 to 19 of 19 for “"Fiber Bragg Grating (FBG)"”.
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Methodology for innovative health monitoring of aerospace structures using dynamic response measurements and advanced signal processing techniques
… exhaustive way the structural state condition. Fiber Bragg Grating (FBG) optical sensors will be used for the recording of dynamic strain measurements from a composite structure. The methodology that will be developed for structural damage detection will use the collected dynamic response data …
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Optical Temperature Monitoring of Electrical Power Transformer Networks
… multiple substations from one central location. Fiber Bragg Grating (FBG) has been used as the optical sensing element for transformer temperature monitoring. Suitable FBG parameters and specifications have been investigated and modeled that fit best for this application. Optical sensor network …
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Detecção de barras quebradas em motores de indução utilizando sensor magnetostrictivo composto aplicado em redes de Bragg em fibras ópticas
… occurs. In this work, a magnetic sensor based on fiber Bragg grating (FBG) and magnetostrictive composite made of Terfenol-D particulates immersed in epoxy resin matrix applied to induction motor is shown to be capable of detecting rotor broken bars in high voltage induction motors, even when the …
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Strain sensor using fiber bragg grating interrogation
… analyzing a novel design of strain sensor using Fiber Bragg Grating (FBG) interrogation. Studies on fiber optic sensors reported have mainly focused on FBG wavelength-based monitoring method by using optical spectrum analyzers (OSA). Although FBG has better strain sensitivity measurement, however …
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Chloride Selective Gold Coated Fiber Bragg Grating Sensor
… aims at a chloride-sensitive gold-plated Fiber Bragg Grating (FBG) sensor that can detect chloride with good resolution. This sensor is designed for applications in water treatment plants and swimming pools where safety and quality matter. And for better results, we use Atomic Layer …
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Machine Learning-Driven Corrosion Detection and Classification in Pipelines
… by a petrochemical company in China, where Fiber Bragg Grating (FBG) sensors were deployed along an oil pipeline to monitor vibrations caused by liquid flow. These vibrations were analyzed to detect potential corrosion. The raw sensor data, often noisy due to environmental factors, was …
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A Quasi-distributed Sensing Network Based on Wavelength-Scanning Time-division Multiplexed Fiber Bragg Gratings
… capability of operation in harsh environments. Fiber Bragg grating (FBG) has attracted considerable interest for this application because of its compactness, electromagnetic immunity, and excellent multiplexing capability. Several FBG multiplexing techniques have been developed to increase the …
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Fully Distributed Multi-parameter Sensors Based on Acoustic Fiber Bragg Gratings
… based on intrinsic scatterings in optical fibers. They demonstrate long sensing span, but their limited applicable parameters (temperature and strain) and costly interrogation systems have prevented their widespread applications. A novel concept of acoustic fiber Bragg grating (AFBG) is …
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Generation of pulsed dual wavelength erbium doped fiber laser
Single and dual wavelength fiber lasers and pulsed fiber lasers are well-known to be used for various applications. In the generation of dual wavelength fiber lasers and pulsed fiber lasers, the researchers found the mode competition among the dual wavelength is caused by the cross-gain saturation …
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Fiber Bragg Gratings Strain Sensors for Railway Applications
Fiber optical sensors have played an important role in applications for monitoring the health of civil infrastructures, such as bridges, oil rigs, and railroads. Due to the reduction in cost of fiber-optic components and systems, fiber optical sensors have been studied extensively for their higher …
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Remote temperature sensing with low-threshold-power using erbium-doped fiber laser
… appropriate action can be taken quickly. Optical fiber laser temperature sensor is one of technologies that can be used for the implementation of remote temperature sensing. Few developments have been reported regarding the use of fiber laser for remote temperature sensing. However, in general …
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A Comprehensive Integrity Monitoring System for Bolted Flange Connections
… were selected to perform the proposed research. Fiber Bragg grating (FBG) -enabled bolts offer a direct measurement of the bolt strains in the flange assembly. The piezo-based active sensing method and the electromechanical impedance (EMI) method provide different approaches to monitor the …
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Monitoring of Overhead Polymer Core Composite Conductors Under Excessive Mechanical Loads Using Fiber Bragg Grating Sensors
… and tension loading. Furthermore, the use of Fiber Bragg Grating (FBG) sensors was investigated for the first time to monitor the ACCC® design during installation and in-service.</p> <p>Transverse low-velocity impacts to the ACCC® conductor having either free or constrained end conditions and …
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Design, Fabrication and Calibration of Compliant, Multi-Axis, Fiber-Optic Force/Torque Sensors for Biomechanical Measurements
… compliant force and torque sensors based on fiber-optic sensing technology, the novel calibration methodologies and the experimental results. A compliant 3-axis, intensity modulated-based, fiber-optic force sensor that simultaneously measures normal and shear forces was designed, prototyped …
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Fiber Optic Sensing of Strain and Temperature for Structures in a Hypersonic Flow
Research into multi-sensor fiber Bragg grating (FBG) networks has the potential to benefit aircrafthealth monitoring systems. The overall goal of this thesis research is to demonstrate that FBG sensors can be used to measure temperature and strain data of a structure in a hypersonic flow. To that …
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Radiation Pressure induced Nonlinearity in Micro-droplet
… optical resonator, where we use an optical fiber taper to couple light into the droplet through non-contact evanescent coupling. The highest Q-factor observed in the experiment is 2x10^7 which closely matches the upper limit of intrinsic Q-factor set by the material absorption. Given with …
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Behaviour and modelling of the inelastic response of concrete and steel-concrete infrastructures subjected to low-cycle fatigue
… were performed. In greater detail, the best Fiber Bragg Grating (FBG) package configuration was obtained by means of monotonic and cyclic tests on substructures. Based on these results, the resulting suitable configuration in a full-scale tunnel test was used to measure deformations with high …
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CO2-rock interaction during CO2-enriched brine injection into storage reservoirs using NMR integrated with fiber optic sensors
… are not captured by LVDT and ESG. Therefore, Fiber Bragg Grating (FBG) sensing has become a promising alternative due to its various advantages, such as resistance to electromagnetic interference, high-pressure and -temperature, small size, multiplexing capability, amongst others. In this …
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Liquid Crystal Optics For Communications, Signal Processing And 3-d Microscopic Imaging
… RF and photonic signal processing, freespace and fiber optic communications and microscopic imaging. These include free-space optical scanners for military and optical wireless applications, variable fiber-optic attenuators for optical communications, photonic control techniques for phased array …