A5101966221- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Advanced Optical Sensing Technologies
- Geochemistry and Elemental Analysis
- Paleontology and Stratigraphy of Fossils
- Magneto-Optical Properties and Applications
- Advanced Sensor and Control Systems
- Advanced Photonic Communication Systems
- Optical Network Technologies
- Geological and Geochemical Analysis
- Safety and Risk Management
- Geological and Geophysical Studies
- Optical Systems and Laser Technology
- Hydrocarbon exploration and reservoir analysis
- Astro and Planetary Science
- Enhanced Oil Recovery Techniques
- Speech and Audio Processing
- Methane Hydrates and Related Phenomena
- Oil and Gas Production Techniques
- Geophysics and Sensor Technology
- Coal Properties and Utilization
- Advanced Measurement and Detection Methods
- Planetary Science and Exploration
Fudan University
2014-2025
Institute of Process Engineering
2024
Chinese Academy of Sciences
2013-2024
University of Chinese Academy of Sciences
2024
China University of Geosciences
2019-2024
China Tobacco
2024
State Key Laboratory of Biogeology and Environmental Geology
2023
University of Shanghai for Science and Technology
2023
Southwest Petroleum University
2022
China Coal Technology and Engineering Group Corp (China)
2022
A line-based fiber optic sensor employing time delay estimation to locate time-varying disturbance is proposed. The consists of two interferometers, multiplexed with a broadband light source, interfering unit and sensing by wavelength division multiplexer, hence detected signals different wavelengths generated the same are obtained. After unique data processing algorithm, fixed achieved determined position disturbance. By signal correlation method extract delay, can be measured. performance...
A novel distributed fiber-optic sensor is proposed and demonstrated, in which two Mach-Zehnder interferometers are used to detect the interference signals with different wavelengths, one 3 × coupler deployed demodulate time-varying phase change caused by vibration. The dual interferometer (DMZI) composed of wavelength division multiplexers. Then, a time delay estimation algorithm designed construct related using difference, constructed obtain vibration position through cross-correlation....
A novel distributed fiber-optic localization algorithm with high sensitivity and precision based on merged Michelson-Sagnac interferometer is proposed demonstrated. By performing simple addition subtraction processing the two phase differences of interferometers, superimposed signals a fixed delay can be obtained. The time calculated by cross-correlation algorithm. Combined polynomial fitting interpolation, disturbance location resolution significantly improved. total sensing distance reach...
It is crucial in a wide range of applications based on optical fiber interference to precisely measure the length difference interferometers. In this article, method measuring absolute between two arms interferometer system phase modulation light source proposed. This enables accurate measurement differences and suitable for both short-distance long-distance systems. Only an additional modulator needs be added realize measurement, making it easily implementable compensating in-service interferometer.
In this paper, polarization diversity is integrated into a 3 × coupler-based passive demodulation system for the first time to mitigate polarization-induced fading (PIF) in interferometric fiber-optic sensors (IFOSs). This study investigates impact of single-mode fiber at receiving end receiver (PDR) on signal demodulation. causes variations fixed phase difference introduced by coupler systems, leading failure. To overcome limitation, what we believe new method proposed, including an...
We designed a distributed fiber optic sensor based on hybrid Michelson-Sagnac interferometer to overcome the defect that conventional structure cannot locate when disturbance position is close midpoint of Sagnac ring. The has excellent and flat frequency response for no-blind zone location. With demodulation algorithm 3 × optical coupler simple mathematical operations, we can get two phase signals with time difference location pattern recognition. were converted two-dimensional images by...
In order to solve the problem of gas accumulation in upper corner caused by large emission due high mining intensity fully mechanized top coal caving face Wangjialing mine, we used numerical simulation method combined with key stratum layer control theory study roof trend and development law inclined fissure. Then analyzed evolution process goaf fissure advance working height Finally, got best hole layout position drilling structure near horizontal high-level directional long drilling. The...
Abstract Multifunctional drug delivery systems (DDS) are in high demand for effectively targeting specific cells, necessitating excellent biocompatibility, precise release mechanisms, and sustained capabilities. The hollow multishelled structure (HoMS) presents a promising solution, integrating structural compositional design efficient DDS development amidst complex cellular environments. Herein, starting from Fe‐based metal‐organic framework (MOF), amorphous coordination polymers (CP)...
Oil transfer pump is the key dynamic equipment in process of oil and gas gathering transportation, its working reliability directly affects safety storage transportation. Intelligent diagnosis a technical method to reduce failure rate pump, ensure transportation process, avoid major accidents caused by failure. Various pumps have been emerged recent decades, common fault types characteristics brought out review. This article highlights on research signal processing methods pump. Firstly,...
Problems associated with the demodulation and localization of acoustic signal produced by fiber optic interferometer are investigated. It is shown that existing method utilizing 3 × coupler do not work well for cannot reach full amplitude sensor to compensate dc normalize amplitude. Modifications improve performance previously proposed suggested. After demodulation, two phase difference signals received have fixed time delay based on a unique data processing method, hence, position...
In this paper, the Sagnac interferometer with a one-way optical fiber ring and novel dual distributed vibration sensor an asymmetrical structure for disturbance localization is proposed. The two interferometers in system are equal lengths of paths. Using time delay estimation based on cross-correlation, can be calculated from demodulated phase signals. precision ±10 m 50 km sensing overall error 0.02%. problem possibly existing systems firstly studied. Due to design path lengths, does not...
ABSTRACT Problems associated with the polarization‐induced signal fading (PSF), produced by random fluctuation of polarization states two interfering optical waves, are established based on Jones matrix model polarization. It is shown that only using Faraday rotating mirrors cannot eliminate PSF problem. Modifications to have fiber‐optic sensor immune suggested and demonstrated experimentally. this new configuration passively eliminated PSF. Theoretical analysis experimental results in...
One of the challenges distributed fiber optic sensors is to monitor objects that have multiple branches, such as pipelines or power grids. Existing require sensing systems cover each branch, which increases cost and complexity monitoring. We propose a sensor based on linear Sagnac interferometer for branch localization practical environments where paths exist. The system dual-wavelength single-core interferometer, can extend branches in cable part. phase difference signals caused by external...
Optical fiber interferometer could achieve various dynamic measurements by transforming phase change into intensity change. In this paper, a novel Michelson (MI) based on two polarization beam splitters (PBSs) is proposed. Two thirds of Rayleigh backscattering (RB) separated from the signal light using PBS and Faraday rotating mirror (FRM) due to difference properties between RB in optical fibers. And signal-to-noise ratio (SNR) system has been significantly improved. Within detection range...