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1.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
Applicant: Nanjing University
Inventor： Yixin Zhang , Chi Zhang , Xuping Zhang , Shuai Tong , Shun Wang , Chenyang Ding , Feng Wang
Abstract: 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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2.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
Applicant: Nanjing University
Inventor： Yixin Zhang , Fei Xiong , Xuping Zhang , Chi Zhang , Long Chen , Shun Wang , Xiaohong Chen , Feng Wang
CPC classification number: H01B11/22 , G02B6/4427 , G01L1/242 , G01K11/32
Abstract: 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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公开(公告)号：US10220388B2
公开(公告)日：2019-03-05
申请号：US15231500
申请日：2016-08-08
Applicant: The Chinese University of Hong Kong , Nanjing University
Inventor： Minghui Tang , Ho-Pui Ho , Guanghui Wang , Siu-Kai Kong , Fong-Chuen Loo , Ho Chin Kwok , Shu-Yuen Wu , Xuping Zhang
Abstract: The disclosure provides a centrifugal microfluidics control system and a method configuring the same. The system may comprise a centrifugal tube; a centrifugal unit for accommodating the centrifugal tube and providing a centrifugal force to the centrifugal tube; a control unit fixed in bottom of the centrifugal tube; and a microfluidic supporting unit coupled to the control unit in the centrifugal tube. The control unit may change an orientation of the microfluidic supporting unit to change a direction of the centrifugal force applied to the microfluidic supporting unit.
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公开(公告)号：US12117361B2
公开(公告)日：2024-10-15
申请号：US17908248
申请日：2022-03-23
Applicant: NANJING UNIVERSITY
Inventor： Yixin Zhang , Xiaohong Chen , Xuping Zhang , Shuai Tong , Lei Liang , Yiming Wan , Feng Wang
IPC: G01M11/00
CPC classification number: G01M11/3145
Abstract: A method for suppressing coherent and polarization-induced fading by simultaneous monitoring of loss and vibration is provided. By using merely common single-mode sensing fibers, the polarization diversity-based measurement method solves the conflict between Φ-OTDR and COTDR in terms of polarization state. In addition, the method not only achieves a better coherent fading noise suppression effect but also enhances the capability of recognizing small loss events in the monitoring of loss parameters. Meanwhile, the method can suppress the influence of coherent fading on the phase demodulation of Φ-OTDR and reconstruct a vibration signal with high fidelity in the monitoring of perturbation parameters, which can effectively reduce the error rate of external perturbation warning.
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Patent Agency Ranking
5.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
Applicant: Nanjing University
Inventor： Yixin Zhang , Shuai Tong , Xuping Zhang , Shaoxiong Tang , Ruofan Wang , Haoran Wang , Shun Wang , Feng Wang
Abstract: 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
Applicant: NANJING UNIVERSITY
Inventor： Yixin Zhang , Jinyu Song , Xuping Zhang , Zhewen Ding , Shuai Tong , Shun Wang , Feng Wang
IPC: G01D5/353
CPC classification number: G01D5/35358
Abstract: 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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7.发明申请BOTDA System that Combined Optical Pulse Coding Techniques and Coherent Detection 有权BOTDA组合光脉冲编码技术和相干检测系统公开(公告)号：US20140218717A1
公开(公告)日：2014-08-07
申请号：US14346955
申请日：2013-06-21
Applicant: Nanjing University
Inventor： Xuping Zhang , Junhui Hu , Lan Xia
CPC classification number: G01K11/32 , G01D5/35364 , G01K2011/322 , G01M11/3118 , G01M11/39
Abstract: A BOTDA system that combined optical pulse coding techniques and coherent detection includes a narrow linewidth laser, two polarization-maintaining couplers, microwave generator, two electro-optic modulators (EOMs), fiber under test, an optical circulator, a 3 dB coupler, a polarization scrambler, a pulse generator, a balance photodetector, an electrical spectrum analyzer, digital signal processing unit and a frequency shifter. The optical pulse coding techniques and coherent detection are simultaneously used in the invented system, which can be enhance the signal-to-noise ration (SNR), the measuring accuracy and the sensing distance of BOTDA. Moreover, the proposed system has the capacity of break interrogation.
Abstract translation: 组合光脉冲编码技术和相干检测的BOTDA系统包括窄线宽激光器，两个偏振保持耦合器，微波发生器，两个电光调制器（EOM），被测光纤，光环行器，3dB耦合器， 偏振扰频器，脉冲发生器，平衡光电检测器，电谱分析仪，数字信号处理单元和移相器。 光脉冲编码技术和相干检测同时用于本发明的系统中，可以增强BOTDA的信噪比（SNR），测量精度和感测距离。 此外，拟议的系统有能力进行讯问。
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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
Applicant: Nanjing University
Inventor： Yixin Zhang , Fei Xiong , Xuping Zhang , Chi Zhang , Long Chen , Shun Wang , Xiaohong Chen , Feng Wang
CPC classification number: H01B11/22 , G01K11/32 , G01L1/242 , G02B6/4427
Abstract: 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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9.发明授权BOTDA system that combined optical pulse coding techniques and coherent detection 有权BOTDA组合光脉冲编码技术和相干检测系统公开(公告)号：US08988671B2
公开(公告)日：2015-03-24
申请号：US14346955
申请日：2013-06-21
Applicant: Nanjing University
Inventor： Xuping Zhang , Junhui Hu , Lan Xia
CPC classification number: G01K11/32 , G01D5/35364 , G01K2011/322 , G01M11/3118 , G01M11/39
Abstract: A BOTDA system that combined optical pulse coding techniques and coherent detection includes a narrow linewidth laser, two polarization-maintaining couplers, microwave generator, two electro-optic modulators (EOMs), fiber under test, an optical circulator, a 3 dB coupler, a polarization scrambler, a pulse generator, a balance photodetector, an electrical spectrum analyzer, digital signal processing unit and a frequency shifter. The optical pulse coding techniques and coherent detection are simultaneously used in the invented system, which can be enhance the signal-to-noise ration (SNR), the measuring accuracy and the sensing distance of BOTDA. Moreover, the proposed system has the capacity of break interrogation.
Abstract translation: 组合光脉冲编码技术和相干检测的BOTDA系统包括窄线宽激光器，两个偏振保持耦合器，微波发生器，两个电光调制器（EOM），被测光纤，光环行器，3dB耦合器， 偏振扰频器，脉冲发生器，平衡光电检测器，电谱分析仪，数字信号处理单元和移相器。 光脉冲编码技术和相干检测同时用于本发明的系统中，可以增强BOTDA的信噪比（SNR），测量精度和感测距离。 此外，拟议的系统有能力进行讯问。
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