齐鲁工业大学（山东省科学院）激光研究所，山东 济南 250104
管道运输安全是国民经济和人民生活的重要保障，管道泄漏监测成为管道运输安全中需要解决的一大难题。本文提出了一种基于分布式光纤振动传感（DVS）系统实现管道泄漏监测的多维空间数据融合算法，将传感光缆固定在管道侧面，通过DVS系统拾取管道泄漏信号，分别根据时间窗和空间分辨率对管道泄漏信号进行时空域平均，设定合适阈值完成管道泄漏监测报警。实验中对单点泄漏以及多点泄漏进行了测试，单点管道泄漏信号信噪比提升了4.5 dB，单点管道泄漏报警率最高提升了19.53 %，多点管道泄漏报警率最高提升了2.29 %，实现了对加压0.2 MPa管道泄漏的实时监测报警。
遥感与传感器 分布式振动传感 时空域 管道泄漏 数据融合 激光与光电子学进展
2023, 60(9): 0928002
Author Affiliations
Abstract
1 School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
2 Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
3 School of Electrical Engineering & Telecommunications, University of New South Wales, NSW 2052, Australia
We propose a new non-intrusive flow measurement method using the distributed feedback fiber laser (DFB-FL) as a sensor to monitor flow in the pipe. The relationship between the wavelength of the DFB-FL and the liquid flow rate in the pipeline is derived. Under the guidance of this theory, the design and test of the flow sensor is completed. The response curve is relatively flat in the frequency range of 10 Hz to 500 Hz, and the response of the flow sensor has high linearity. The flow from 0.6 m3/h to 25.5 m3/h is accurately measured under the energy analysis method in different frequency intervals. A minimum flow rate of 0.046 m/s is achieved. The experimental results demonstrate the feasibility of the new non-intrusive flow measurement method based on the DFB-FL and accurate measurement of small flow rates.
DFB-FL flow non-intrusive measurement energy analysis frequency interval Chinese Optics Letters
2020, 18(2): 021204
Author Affiliations
Abstract
1 Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute of Shandong Academy of Sciences, Jinan, Shandong, 250014, China
2 School of Electrical Engineering & Telecommunications, the University of New South Wales, NSW, 2052, Australia
3 Shengli Oilfield Xinsheng Geophysical Technology Co. Ltd., Dongying, Shandong, 257000, China
The distributed acoustic sensing (DAS) has been extensively studied and widely used. A distributed acoustic sensing system based on the unbalanced Michelson interferometer with phase generated carrier (PGC) demodulation was designed and tested. The system could directly obtain the phase, amplitude, frequency response, and location information of sound wave at the same time and measurement at all points along the sensing fiber simultaneously. Experiments showed that the system successfully measured the acoustic signals with a phase-pressure sensitivity about –148 dB (re rad/μPa) and frequency response ripple less than 1.5 dB. The further field experiment showed that the system could measure signals at all points along the sensing fiber simultaneously.
Distributed acoustic sensing Distributed acoustic sensing phase generated carrier phase generated carrier interferometer interferometer frequency response frequency response Photonic Sensors
2017, 7(3): 193
Author Affiliations
Abstract
1 Laser Research Institute of Shandong Academy of Sciences, Jinan, 250014, China
2 Key Laboratory of Optical Fiber Sensoring Technology of Shandong Province, Jinan, 250014, China
In the field of oil well logging, real-time monitoring of the fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase in reservoir recovery, so a non-intrusive flow test method based on turbulent vibration was proposed. The specific length of the sensor fiber wound tightly around the outer wall of the pipe was connected with the optical fiber gratings at both ends, and the sensor fiber and the optical fiber gratings composed the flow sensing unit. The dynamic pressure was generated by the turbulence when fluid flows through the pipe, and the dynamic pressure resulted in the light phase shift of the sensor fiber. The phase information was demodulated by the fiber optic interferometer technology, time division multiplexing technology, and phase generated carrier modulation and demodulation techniques. The quadratic curve relationship between the phase change and flow rate was found by experimental data analysis, and the experiment confirmed the feasibility of the optical fiber flow test method with non-intrusion and achieved the real-time monitoring of the fluid flow.
Oil flow turbulent vibration the fiber optic interferometer phase generated carrier Photonic Sensors
2014, 4(2): 132
