A5088291332- Advanced Fiber Optic Sensors
- Vibration Control and Rheological Fluids
- Seismic Performance and Analysis
- Structural Engineering and Vibration Analysis
- Advanced Fiber Laser Technologies
- Geophysics and Sensor Technology
- Photonic and Optical Devices
- Seismic Waves and Analysis
- Advanced Sensor and Control Systems
- Structural Health Monitoring Techniques
- Water Quality Monitoring Technologies
- Photonic Crystal and Fiber Optics
- Optical Systems and Laser Technology
- Advanced MEMS and NEMS Technologies
- Advanced Photonic Communication Systems
- Optical Network Technologies
- Non-Invasive Vital Sign Monitoring
- Mechanical and Optical Resonators
- Optical measurement and interference techniques
- Underwater Acoustics Research
- Neural Networks and Reservoir Computing
- Dielectric materials and actuators
- Advanced Optical Sensing Technologies
- Underwater Vehicles and Communication Systems
- Effects of Vibration on Health
Qilu University of Technology
2018-2025
Shandong Academy of Sciences
2016-2025
Beijing University of Technology
2022-2024
Hefei University of Technology
2023
Laser Research Institute
2018
A novel broadband and high sensitivity fiber Bragg grating (FBG) accelerometer is designed analyzed. The based on a compact structure consisting of double diaphragms h-shaped hinges. hinge used to break through the restriction between resonance frequency. FBG demodulated by an interferometric method test results show that acceleration 32 dB re pm/g 1 Hz kHz, with fluctuation less than ±3 dB, resonant frequency above 1.6 kHz. cross-sensitivity -26 in flat 15μg/√ wide range, making it...
Abstract Fiber-optic distributed acoustic sensing (DAS) systems based on phase-sensitive optical time-domain reflection technology have been widely used for perimeter security and oil gas pipeline safety monitoring. To address the problem of low recognition accuracy high-sampling-rate long-sequence signal data (length greater than or equal to 1000 points) collected by DAS system, we propose a CDIL-CBAM-BiLSTM network model feature fusion. The uses modified circular dilated convolutional...
A fiber Bragg grating (FBG) and Fabry–Perot (FP) cavity cascaded sensing system was manufactured for temperature pressure sensing. Temperature as high 175°C performed by an FBG the linear variation of wavelength with temperature. After sensed, demodulation can find original FP length its correlation coefficient; thus, ambient would be calculated. The 100 MPa a repeatability 1/10,000 stability. This kind sensor has been used in Shengli Oil Field.
A fiber-optic extrinsic Fabry–Perot interferometric (EFPI) temperature sensor with extremely high resolution and large dynamic range is proposed demonstrated. The uses a thermally expanded core (TEC) fiber as the first reflective surface of interference cavity to focus beam improve finesse fringes, which enables length multivalley averaging method based on estimation fringe order. Using borosilicate capillary temperature-sensitizing material, sensitivity 79.25 nm/°C well good linearity were...
We propose a distributed optical fiber sensing event recognition scheme based on Markov Transition Field (MTF) and knowledge distillation. The algorithm has the advantages of being lightweight, fast, high accuracy. data are converted into images by MTF algorithm, which keeps signals correlated in time domain while highlighting visual differences between different events. A two-stage distillation model compression method is proposed, effectively compresses large-scale lightweight with optimal...
A short cavity distributed feedback (DFB) fiber laser is used for low frequency acoustic signal detection. Three DFB lasers with different central wavelengths are chained together to make three-element vector hydrophone proper sensitivity enhancement design, which has extensive and significant applications underwater monitoring the national defense, oil, gas exploration, so on. By wavelength-phase demodulation, lasing wavelength changes under signals can be interpreted, tested about 33 dB re...
Abstract The distributed acoustic sensing (DAS) system based on phase-sensitive optical time domain reflection ( Φ-OTDR) technology is widely used in pipeline safety monitoring, perimeter security, structure etc. Accurate localization and recognition of multi-scene events over long distances has always been a challenge. This paper proposes an improved YOLOv7 algorithm for multi-event real-time detection DAS system. employs space-to-depth Conv(SPD-Conv) to replace the strided convolutions...
This paper describes a dense wavelength-division multiplexing scheme with low crosstalk for fiber Bragg grating (FBG) sensors based on interferometric detection. The uses 100-GHz spacing multiplexer two-level optical filters to separate the returned wavelengths from FBG sensor array, enabling high-resolution dynamic wavelength demodulation each narrow spacing. An array three gratings was demonstrated, and resolution of ∼7×10−4 pm/√Hz tested, bandwidth 1 Hz kHz sensor. FBGs have an operating...
In this letter, we propose a new scheme that combines capillary tube with an elastic cavity to develop thin fiber laser hydrophone (FLH) static pressure equalization, enhanced dynamic sensitivity and broadband flat response. We demonstrate the improvement on response characteristics by introducing compensation structure into diaphragm-based FLH. A prototype diameter of 7.2 mm was packaged has 9×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We present a high-sensitivity fiber Bragg grating (FBG)-based microphone with flat response and static pressure equalization. A very high dynamic sensitivity of the is achieved by sensing structure based on carbon diaphragm. Static equalization realized balance capillary glass tube. The resonances sensor are suppressed air damping structures, broadened achieved. An acoustic-solid interaction model was used to analyze characteristics microphone. experimental prototype produced tested, results...