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公开(公告)号：US11804316B2
公开(公告)日：2023-10-31
申请号：US17841416
申请日：2022-06-15
申请人： Nanjing University
发明人： Yixin Zhang , Fei Xiong , Xuping Zhang , Chi Zhang , Long Chen , Shun Wang , Xiaohong Chen , Feng Wang
CPC分类号： H01B11/22 , G01K11/32 , G01L1/242 , G02B6/4427
摘要： The invention discloses an underwater umbilical cable which is capable of temperature and vibration measuring and three-dimensional shape reconstruction, wherein underwater umbilical cable is used to connect underwater equipment and aquatic equipment; the underwater umbilical cable comprises an outer sheath, armored steel wires, an inner sheath, a power cable, a communication optical cable, a steel pipe, three strain measuring optical fibers, three temperature measuring optical fibers, a distributed optical fiber strain interrogator, a distributed optical fiber temperature interrogator and a processor. The invention can collect the operation status data of the umbilical cable for a long time. The collected data is highly objective, can truly reflect the real-time operation status of the umbilical cables, and plays an important role in guaranteeing the long-term submarine oil and gas exploitation.
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2.发明公开公开(公告)号：US20240353349A1
公开(公告)日：2024-10-24
申请号：US18357572
申请日：2023-07-24
申请人： Nanjing University
发明人： Yixin Zhang , Shuai Tong , Xuping Zhang , Shaoxiong Tang , Ruofan Wang , Haoran Wang , Shun Wang , Feng Wang
摘要： A monitoring system and method for broken wires in PCCP based on distributed optical fiber sensing relates to the technical field of optical fiber sensing. The monitoring system for broken wires in PCCP comprises a Sagnac interferometer, a Φ-OTDR system, a dual loopback system and a signal processing system. The Sagnac interferometer comprises a first laser, a first optical coupler, a first delay optical fiber, a Faraday rotating mirror and a first photodetector. The Φ-OTDR system comprises a second laser, a second optical coupler, an acousto-optic modulator, a circulator, a third optical coupler and a second photodetector. The dual loopback system comprises a wavelength division multiplexer and a second delay optical fiber. The invention solves the problems of low positioning accuracy, limited frequency measurement range, detection dead zone and high computing pressure in monitoring broken wires in PCCP.
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公开(公告)号：US11860008B2
公开(公告)日：2024-01-02
申请号：US17920809
申请日：2022-05-06
申请人： NANJING UNIVERSITY
发明人： Yixin Zhang , Jinyu Song , Xuping Zhang , Zhewen Ding , Shuai Tong , Shun Wang , Feng Wang
IPC分类号： G01D5/353
CPC分类号： G01D5/35358
摘要： A self-heterodyne phase-sensitive optical time domain reflectometry (φ-OTDR) system with a free multi-spatial resolution includes a narrow linewidth laser source, a 1×3 fiber-optic coupler, three acousto-optic modulators (AGMs), a 3×1 fiber-optic coupler, two time-delay fibers, an erbium-doped fiber amplifier (EDFA), a circulator, a photodetector, an electrical amplifier, three filters, a data acquisition card, a pulse signal generator, and a driver module. A plurality of acousto-optic modulators using the same driver are used to couple probe light with different pulse intervals and different frequency shifts and then inject the probe light into a fiber, such that a self-heterodyne detection structure with a multi-spatial resolution is implemented, which suppressed optical background noise such as coherent fading noise, phase noise introduced by a frequency drift of a light source, and pseudo-random noise (PRN).
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4.发明公开公开(公告)号：US20240353441A1
公开(公告)日：2024-10-24
申请号：US18349384
申请日：2023-07-10
申请人： Nanjing University
发明人： Yixin Zhang , Chi Zhang , Xuping Zhang , Shuai Tong , Shun Wang , Chenyang Ding , Feng Wang
摘要： An ocean current detection device and method based on double-helix and double-core vibration fiber-optic cable, comprises a double-core fiber-optic cable and a φ-OTDR system; the double-core fiber-optic cable comprises a first and a second optical fiber core, provided symmetrically in the double helix structure. The terminate ends of the first and the second optical fiber core are connected, and the start end of the first or the second optical fiber core is connected with the φ-OTDR system. When measuring the ocean current characteristics in the target sea area, the double-core fiber-optic cable is provided underwater to generate vortex-induced vibration. The φ-OTDR system is provided for emitting laser towards the cable, receiving returned double-core vibration signals, extracting vibration characteristics from the double-core vibration signals to determine ocean current characteristics, including ocean current flow velocity and direction, to improve the detection accuracy.
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5.发明公开公开(公告)号：US20230154653A1
公开(公告)日：2023-05-18
申请号：US17841416
申请日：2022-06-15
申请人： Nanjing University
发明人： Yixin Zhang , Fei Xiong , Xuping Zhang , Chi Zhang , Long Chen , Shun Wang , Xiaohong Chen , Feng Wang
CPC分类号： H01B11/22 , G02B6/4427 , G01L1/242 , G01K11/32
摘要： The invention discloses an underwater umbilical cable which is capable of temperature and vibration measuring and three-dimensional shape reconstruction, wherein underwater umbilical cable is used to connect underwater equipment and aquatic equipment; the underwater umbilical cable comprises an outer sheath, armored steel wires, an inner sheath, a power cable, a communication optical cable, a steel pipe, three strain measuring optical fibers, three temperature measuring optical fibers, a distributed optical fiber strain interrogator, a distributed optical fiber temperature interrogator and a processor. The invention can collect the operation status data of the umbilical cable for a long time. The collected data is highly objective, can truly reflect the real-time operation status of the umbilical cables, and plays an important role in guaranteeing the long-term submarine oil and gas exploitation.
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