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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - A Fiber Bragg Grating-based Wind Erosion Monitoring System
摘要： This paper proposes a wind erosion monitoring system includes a shunt-hedging and cyclone-separation sand sampler built by Fluent and a weighting sensor based on FBG. According to the simulation and experiment, this system had anti strong wind interference performance and time, passively, in real continuously, and in a long distance. it could measure
关键词： wind erosion,weighting sensor,sand sampler,fiber Bragg grating
更新于2025-09-23 15:21:01
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[IEEE 2018 IEEE 7th International Conference on Photonics (ICP) - Langkawi, Malaysia (2018.4.9-2018.4.11)] 2018 IEEE 7th International Conference on Photonics (ICP) - Etched Fiber Bragg Grating Sensor for Nitrate Sensing Application
摘要： We demonstrate a reliable method to detect the concentration of Nitrate in water using an etched Fiber Bragg Grating (FBG) sensor. The sensor was etched using 48% Hydrofluoric (HF) acid solution to function as a chemical sensor and interact with Nitrates. The Bragg wavelength ((cid:2)b) shifted due to the changes of Nitrate concentration. The sensitivity achieved by this sensor is 2.4 x 10-3 nm/ppm. The overall shift of the Bragg wavelength is 0.12 nm from 0 – 50 ppm.
关键词： Nitrate ions,Fiber Bragg Grating sensor
更新于2025-09-23 15:21:01
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Nuclear Power Plant Prestressed Concrete Containment Vessel Structure Monitoring during Integrated Leakage Rate Testing Using Fiber Bragg Grating Sensors
摘要： As the last barrier of nuclear reactor, prestressed concrete containment vessels (PCCVs) play an important role in nuclear power plants (NPPs). To test the mechanical property of PCCV during the integrated leakage rate testing (ILRT), a fiber Bragg grating (FBG) sensor was used to monitor concrete strain. In addition, a finite element method (FEM) model was built to simulate the progress of the ILRT. The results showed that the strain monitored by FBG had the same trend compared to the inner pressure variation. The calculation results showed a similar trend compared with the monitoring results and provided much information about the locations in which the strain sensors should be installed. Therefore, it is confirmed that FBG sensors and FEM simulation are very useful in PCCV structure monitoring.
关键词： structure health monitoring (SHM),finite element method (FEM),integrated leakage rate test (ILRT),fiber Bragg grating (FBG),prestressed concrete containment vessel (PCCV)
更新于2025-09-23 15:21:01
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Evaluation of Chirped Fiber Bragg Grating with APD on Designed Optical Fiber Communication Link
摘要： Application of fiber Bragg grating (FBG) in optical communication is an evolving field. In this research paper, various types of chirped FBG’s (CFBG) have been used with avalanche photodiode (APD) on the designed optical fiber communication (OFC) link. Data rate of 20 Gbps and return-to-zero modulation format has been kept as fixed parameters. The designed link has been evaluated for varying fiber lengths (100, 200, 300, 400 and 500 km), various type of CFBG’s (linear, quadratic, square root and cubic root) with Gaussian apodization function, varying grating lengths (10, 20, 30, 40 and 50 mm) and operating temperatures (5°C, 10°C, 15°C, 20°C, 25°C, 30°C). The designed OFC link has also been evaluated for APD with and without CFBG. The performance evaluation matrix parameters selected are Q-factor, bit error rate and eye diagram. The OFC link employing CFBG with APD has been found to be superior. In compensating chromatic dispersion, optimum results have been observed for linear CFBG with Gaussian apodization function in comparison to other types of CFBG with 50 mm grating length for the maximum transmission distance.
关键词： bit error rate (BER),Optical fiber communication (OFC),eye diagram,chirped fiber Bragg grating (CFBG),vertical cavity surface emitting laser (VCSEL),avalanche photodiode (APD),Q-factor
更新于2025-09-23 15:19:57
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[IEEE 2018 Eighth International Conference on Instrumentation & Measurement, Computer, Communication and Control (IMCCC) - Harbin, China (2018.7.19-2018.7.21)] 2018 Eighth International Conference on Instrumentation & Measurement, Computer, Communication and Control (IMCCC) - Research on Internal Temperature of Transformer Internal Temperature Based on Optical Fiber Sensing Technology
摘要： Transformer is an important link of power system, and its operation state directly affects the security and stability of power system operation. With the continuous development of the national economy and the continuous improvement of the people's needs, the power grid load has been continuously improved, and the capacity of the transformer has been continuously expanded, and the accident rate has increased accordingly. According to related statistics, more than 66 kv transformer of the world's average accident rate over 0.89%, especially for winding in transformer winding overtemperature operation, result insulation aging and breakdown, accident of burning large ratio (according to the statistics, about 80% of the accident rate above). For oil-immersed power transformer, the time depends on the service life of solid insulating materials (fiber paper), prompting insulation materials is the main factor of aging temperature, moisture and oxygen, heat effect of transformer insulation aging is the decisive factor, therefore the transformer internal main parts (winding and iron core, the place such as insulating oil) temperature decides the service life of the transformer temperature due to the electric power equipment testing environment with high voltage and strong electromagnetic interference, and space is narrow, the traditional method cannot directly on the power equipment temperature state of online measurement, and a new temperature measuring system based on semiconductor optical fiber sensing technology has small volume, good insulation, good resistance to electromagnetic interference, temperature measurement consistency, can be directly installed on the transformer and other power equipment inside, can accurate and fast reflect the change of the internal temperature of main components of power transformer, the transformer winding and iron core, the place such as insulating oil temperature real-time online measurement.
关键词： Fiber coupler,Fiber Bragg grating,F-P filter,transformer
更新于2025-09-23 15:19:57
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Model and Experimental Study on Optical Fiber CT Based on Terfenol-D
摘要： A nonlinear hysteresis model of magneto-mechanical-thermo coupling for Terfenol-D materials is presented according to Wiss ferromagnetic theory, thermodynamics relations and Jiles–Atherton model. Numerical calculation and experimental results show that the mode well reflects the magnetostrictive characteristics of Terfenol-D rod under the coupling of stress, temperature and magnetic field. A fiber Bragg grating current transformer based on Terfenol-D material is designed according to the strain sensing mechanism of fiber Bragg grating and the demodulation principle of unbalanced M–Z interferometer. The theoretical analysis and research on the working characteristics of the fiber current transformer under the influence of different prestressing force and bias current are carried out. The results are important for the design and application of the current transformer with the Terfenol-D material.
关键词： current transformer,fiber Bragg grating,Terfenol-D,unbalanced M–Z interferometer
更新于2025-09-23 15:19:57
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[IEEE IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - Lisbon, Portugal (2019.10.14-2019.10.17)] IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - Fast Model-Based Fault Detection in Single-Phase Photovoltaic Systems
摘要： Besides distinct signal generation, optoelectronic oscillators (OEOs) have also been rapidly developed as emerging techniques towards sensing, measurement, and detection. In this paper, we start with the conceptual architecture and the analytical model of OEOs. Then, three operation principles behind sensing, measurement, and detection applications are categorized, including the variation on the time delay of loop, the passband reconfiguration of microwave photonic filter in loop, and the oscillation gain from injection locking, which clearly clarify the X-to-frequency mapping (X denotes target parameter or signal) for supporting practical solutions and approaches. Next, a comprehensive review to advances in OEO-based sensing, measurement, and detection applications is presented, including length change and distance measurement, refractive index estimation, load and strain sensing, temperature and acoustic sensing, optical clock recovery, and low-power RF signal detection. As a new application example, a novel approach for in-line position finding is proposed. When a long fiber Bragg grating inserted into OEO is locally heated to slightly broaden its reflection spectrum, the target position heated is mapped into the oscillating frequency shift, according to the first operation principle. A sensitivity of 254.66 kHz/cm is obtained for position finding in the experiment. Afterward, solutions for calibration and stabilization are briefly introduced, which enable us to improve the accuracy and reliability. Finally, features and future prospects on the sensing, measurement, and detection applications are discussed, such as compact and integrated OEOs.
关键词： Optoelectronic oscillator (OEO),fiber Bragg grating,detection,measurement,oscillating frequency,sensing and sensor,position finding,photonic integrated circuits (PICs)
更新于2025-09-23 15:19:57
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[IEEE 2018 International Russian Automation Conference (RusAutoCon) - Sochi (2018.9.9-2018.9.16)] 2018 International Russian Automation Conference (RusAutoCon) - Fiber Optic Technologies for Diagnostic Monitoring of Digital Energy Grids Based on “Smart Grids Plus” Concept
摘要： A modern level of information technologies and computer facilities, as well as an actively developing digitalization of energy grids, allow us to reconsider approaches towards the development and improvement of the functions of automation and control systems for energy installations of various voltage classes. Primarily, it is a medium voltage, as the most common and, in connection with this, the most significant for end users. We propose a new 'Smart Grids Plus' concept for the digital energy grids design. These grids, in addition to the layers of intelligent energy grids and information communication channels, include a layer of diagnostic monitoring based on a passive fiber optic sensor networks. Sensor networks have a hybrid TWDM structure – information exchange channels and integrated fiber optical sensors – core, based on a new technology for address interrogation and multiplexing – special addressable fiber Bragg gratings, combined for arbitrary topologies. Some examples of diagnostic monitoring nets for temperature control of complete switchgear contacts and busbars are considered. Their principles of operation are discussed. The main advantages of these sensor networks are using addressable fiber Bragg gratings simultaneously with sensors and multiplexing elements, and using the PON structure simultaneously with sensor and communication networks.
关键词： fiber optic sensor and passive optical network,complete switchgear contact,smart grids plus,digital energy grids,temperature monitoring,busbar,addressable fiber Bragg grating
更新于2025-09-19 17:15:36
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Cascaded tilted fiber Bragg grating for enhanced refractive index sensing
摘要： We proposed and experimentally demonstrated a cascaded tilted fiber Bragg grating (TFBG) for enhanced refractive index sensing. The TFBG is UV-inscribed in series in ordinary single-mode fiber (SMF) and reduced-diameter SMF with the same tilt angle, and then excites two sets of superposed spectral combs of cladding modes. The cascaded TFBG with total length of 18 mm has a much wider wavelength range over 100 nm and narrower wavelength separation than that of a TFBG only in the SMF, enabling an enlarged range and a higher accuracy of refractive index measurement. The fabricated TFBG with the merits of enhanced sensing capability and temperature self-calibration presents great potentials in the biochemical sensing applications.
关键词： refractive index measurement,tilted fiber Bragg grating,fiber optics sensors
更新于2025-09-19 17:15:36
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All-Fiber CO2 Sensor Using Hollow Core PCF Operating in the 2 μm Region
摘要： A realistic implementation of an all-fiber CO2 sensor, using 74 cm of hollow core photonic crystal fiber (HC-PCF) as the cavity for light/gas interaction, has been implemented. It is based on CO2 absorbance in the 2 μm region. The working range is from 2% to 100% CO2 concentration at 1 atm total pressure and the response time obtained was 10 min. Depending on the concentration level, the sensor operates at one of three different wavelengths (2003.5 nm, 1997.0 nm and 1954.5 nm) to maintain a high sensitivity across all the working range.
关键词： gas,sensor,tunable laser,carbon dioxide monitoring,fiber bragg grating,photonic crystal fiber
更新于2025-09-19 17:15:36