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Portable Optical Fiber Bragg Grating Sensor for Monitoring Traffic Density
摘要： The paper examines the development of a portable sensor strip with fiber optic Bragg grating for monitoring urban traffic density up to 80 kph. It contains a 2.5-m-long and a 2-cm-high sensor created from a combination of silicone addition rubber (bicomponent addition silicone rubber) and Bragg grating placed inside a carbon tube. The design of the portable sensor permits traffic density and cars crossings to be monitored and detected in a single lane. The functionality of the sensor was verified in real traffic; the results of this study are based on the detection of 1518 vehicles of different types and sizes. According to the measurements, the sensor is characterized by a high detection rate of 98.946%.
关键词： portable sensor,car detection,Fiber Bragg Grating,optical fiber,density traffic monitoring
更新于2025-09-16 10:30:52
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Wavelength-tunable thulium-doped fiber laser with sampled fiber Bragg gratings
摘要： A continuous wave (CW) wavelength-tunable Tm3+-doped fiber laser with two sampled fiber Bragg gratings (SFBGs) has been proposed and demonstrated. This proposed laser is stable operating with a significant 14.44 nm wavelength range from 1942.09 nm to 1956.53 nm due to the Vernier effect. The laser OSNRs of different wavelengths ranged from 45 dB to 58 dB at a launched pump power of 3.67 W. The wavelength shift and power fluctuation were less than 0.03 nm and 0.46 dB, respectively. An 8.62% slope efficiency was achieved using a grating for laser extracting. To the authors’ knowledge, this is the first time that a wavelength-tunable Tm3+-doped fiber laser with two SFBGs has been demonstrated.
关键词： Wavelength-tunable,Thulium-doped fiber laser,Sampled fiber Bragg grating
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE SENSORS - Montreal, QC, Canada (2019.10.27-2019.10.30)] 2019 IEEE SENSORS - Optical Fiber Bragg Grating Based Pressure Sensor Using a Composite Diaphragm For Pressure Measurements
摘要： The development of an optical fiber based pressure sensor, created using a Fiber Bragg Grating (FBG) and a glass fiber reinforced polymer membrane for use in aerodynamic applications, is reported. The FBG was co-bonded on the surface of the membrane to measure the strain induced by the deflection of the diaphragm with applied pressure. The sensor exhibited high sensitivities of 56.7 pm/kPa, with a minimum resolution of 21 Pa over a 0 to 35 kPa range. The outputs from a mathematical model, Finite Element analysis and the experimental results are compared and discussed.
关键词： Glass Fiber Reinforced Polymer,Finite Element Analysis,Fiber Bragg Grating,optical pressure sensor
更新于2025-09-16 10:30:52
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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) - Fiber Optic Seismic Monitoring System for Highway Rock Slope
摘要： for the stability is essential Seismic monitoring assessment of highway rock slope. This paper presents the design and implementation of a precision fiber optic seismic monitoring system for highway rock slope using fiber Bragg grating geophone and vertical-cavity surface-emitting laser-based interrogator. The overall composition, sensor design and interrogation scheme are introduced in detail. The field test results show that this system has great potential for stability monitoring of highway rock slope.
关键词： Fiber Bragg grating geophone,Vertical-cavity surface-emitting laser,Rock Slope,Seismic monitoring
更新于2025-09-16 10:30:52
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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) - Micro-displacement Sensor with Temperature Compensation based on Double-ball Cascade and Fiber Bragg Grating
摘要： the with light of Bragg grating's According to the double-ball structure and the sensing characteristics of the fiber Bragg grating (FBG), a micro-displacement temperature sensor compensation is proposed and verified experimentally. The sensing structure is made of a FBG and a double-ball cascade. The first ball is used to excite the cladding mode, and the second can get the coupling interference between the cladding mode and the core mode. In inherent temperature characteristic, it can only be used to estimate temperature. The drift of single mode fiber transmission interference dip and Bragg grating spectrum are independent of each other. It reduces the influence of cross sensitivity between temperature and displacement. The experimental results show that the micro-displacement and temperature detection ranges are 0~0.16mm and 20~160°C; the micro-displacement and temperature sensitivities of the sensor are -89.892 nm/mm and -0.088 nm/°C, respectively. And the temperature sensitivity of FBG dip is 0.012 nm/°C. The with micro-displacement temperature-compensated by calculating the sensing matrix. measurement can obtained be
关键词： Fiber Bragg grating,Temperature compensation,Double-ball cascade,Micro-displacement
更新于2025-09-16 10:30:52
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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) - Disturbed PD Detection System Based on Improved φ-OTDR Assisted by wFBG Array
摘要： A disturbed acoustic sensing system (DAS) based on improved φ-OTDR is proposed and experimentally demonstrated. A weak fiber Bragg grating (wFBG) array is introduced into sensing fiber to increase the signal to noise ratio (SNR) of system. In order to detecting the acoustic signals generated by partial discharge (PD) of 10KV power cables, the sensing fiber was packaged with an aluminium tape to enhance the sensitivity. The experimental results demonstrate the system performs well in demodulating PD signals, and has advantages of relatively high sensitivity and broadband frequency response.
关键词： weak fiber Bragg grating,Partial Discharge,φ-OTDR,acoustic detection
更新于2025-09-16 10:30:52
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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) - New Interpolation Method for Shape Sensors Based on Fiber Bragg Grating
摘要： In this paper, we propose an improved method to reconstruct object shape for shape sensors based on fiber bragg grating (FBG), where FBG array is embedded in silicone gel as protection shell and glued on rubber tape surface to distinguish bending direction. The calibration experiments of FBG are presented to ensure relative precise conversion between FBG wavelength offsets and bending curvature. In the improved method, spline technique instead of traditional linear technique is employed to characterize relationship between bending curvature and arc length, with Frenet-serret equation used in the procedure of object shape reconstruction. The experiment results show interpolation technique induces lower error than linear interpolation technique, which verifies that an improvement in object shape reconstruction can be achieved by employing spline interpolation technique.
关键词： frenet-serret equation,spline interpolation method,Fiber bragg grating,Shape sensing
更新于2025-09-16 10:30:52
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High-Speed and High-Resolution Microwave Photonic Interrogation of a Fiber-Optic Refractometer With Plasmonic Spectral Comb
摘要： Microwave photonic interrogation of a high-speed and high-resolution refractive index (RI) sensor based on a tilted fiber Bragg grating with surface plasmon resonance (TFBG-SPR) is proposed and experimentally demonstrated. Instead of demodulating the wavelength shift or intensity change of a TFBG-SPR spectrum in the optical domain, we convert the TFBG-SPR spectrum to the time domain based on spectral shaping (SS) and wavelength-to-time (WTT) mapping and use a digital signal processor (DSP) to extract the RI information at a high speed and high resolution. In the experiment, when an Au-coated TFBG is immersed in a solution, the TFBG-SPR spectrum will produce a dip. When the RI changes, the location of the dip in the TFBG-SPR spectrum will shift, which is a function of the RI. By passing a broadband frequency-chirped optical pulse generated by a frequency swept laser source to the TFBG-SPR and detecting the optical pulse at the output of the TFBG-SPR at a photodetector (PD), due to SS-WTT mapping, a temporal waveform with its shape identical to the optical spectrum is produced. A DSP is then used to extract the SPR envelope information from the temporal waveform. By monitoring the changes of the SPR envelope, the RI information is interrogated with a high resolution of 1.123×10-6 RIU at a high speed over 20 kHz.
关键词： Surface plasmon resonance,Tilted fiber Bragg grating,Microwave photonics,Refractive index measurement
更新于2025-09-16 10:30:52
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[IEEE 2019 Eleventh International Conference on Ubiquitous and Future Networks (ICUFN) - Zagreb, Croatia (2019.7.2-2019.7.5)] 2019 Eleventh International Conference on Ubiquitous and Future Networks (ICUFN) - Fault Monitoring in Passive Optical Networks Using Burst-Mode FBG Optical Sensor
摘要： This paper presents a fault monitoring method in passive optical networks (PON) using Burst-mode uniform FBG optical sensors. The proposed monitoring method detects physical layer faults between optical line terminal (OLT) and optical network units (ONUs). The FBG interrogation subsystem located in central office (CO) near OLT transmits FBG monitoring signal to every ONU. Each ONU branch contains an FBG sensor subsystem. The proposed system provides Burst mode upstream data transmission using time division multiple access (TDMA). We show that the proposed system is a cost- effective solution that has ability to monitor faults of any ONU branches in PON.
关键词： Fiber Bragg Grating,Fault Monitoring in PON,Burst-Mode uniform FBGs
更新于2025-09-16 10:30:52
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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) - Overhead Transmission Line Tensiometer on Insulator String Based on Fiber Bragg Grating
摘要： This paper proposes an overhead transmission line tensiometer on insulator string based on fiber Bragg grating and cantilever beam. According to simulation and experiment, the tensiometer is suitable for overhead transmission line breakage warning.
关键词： tensiometer,fiber Bragg grating,cantilever beam
更新于2025-09-16 10:30:52