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1.发明授权公开(公告)号：US09163960B2
公开(公告)日：2015-10-20
申请号：US14201915
申请日：2014-03-09
Inventor： Yunjiang Rao , Zinan Wang , Zengling Ran
CPC classification number: G01D5/35354 , G01J1/42 , G01J5/10
Abstract: A long-distance polarization and phase-sensitive reflectometry based on random laser amplification for extending a sensing distance includes a long-distance polarization and phase-sensitive reflectometry of a distributed Raman amplification based on optical fiber random lasers generated by unilateral pumps, a long-distance polarization and phase-sensitive reflectometry of a distributed Raman amplification based on optical fiber random lasers generated by bilateral pumps, and a long-distance polarization and phase-sensitive reflectometry of a Raman amplification based on a combination of optical fiber random lasers generated by unilateral pumps and a common Raman pump source, which are applied in optical fiber perturbation sensing and have a capability of greatly improving a working distance of a sensing system and a high practicability.
Abstract translation: 基于用于扩展感测距离的随机激光放大的长距离偏振和相敏反射测量包括基于由单侧泵产生的光纤随机激光器的分布式拉曼放大的长距离偏振和相敏反射测量， 基于由双边泵生成的光纤随机激光器的分布式拉曼放大的距离偏振和相敏反射测量，以及基于单边产生的光纤随机激光器的组合的拉曼放大的长距离偏振和相敏反射测量 泵和普通的拉曼泵浦源，它们应用于光纤扰动感测中，具有大大提高感测系统工作距离和高实用性的能力。
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2.发明申请公开(公告)号：US20190288475A1
公开(公告)日：2019-09-19
申请号：US16427347
申请日：2019-05-31
Inventor： Yunjiang Rao , Kang Li , Bing Han , Yun Fu , Zengling Ran
Abstract: A long-distance FODAS amplification system includes a distributed amplification unit, which includes a LEAF, a pump, and a WDM; wherein the pump light passes through the WDM into the LEAF, so as to realize distributed amplification. A long-distance FODAS amplification method includes steps of: 1) modulating and amplifying a light source to obtain the probe pulse light; 2) guiding the pump light and the probe pulse light into LEAF; 3) combining the probe pulse light with the pump light to perform distributed amplification, so as to generate power-raised Rayleigh backscattered light; and 4) converting and demodulating the Rayleigh backscattered light after being output through the circulator, so as to complete distributed sensing.
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公开(公告)号：US09679478B2
公开(公告)日：2017-06-13
申请号：US14694984
申请日：2015-04-23
Inventor： Huijuan Wu , Yunjiang Rao , Ya Qian , Hanyu Li
Abstract: An online traffic volume monitoring system based on a phase-sensitive optical time domain reflectometry and its monitoring method are related to a field of intelligent transportation and an application of distributed fiber sensing. A vehicle moving temporal-spatial response graph is generated by accumulating differentiated Optical Time-Domain Reflectometry tracks at different moments in one unit monitoring period for traffic volume statistics, and then converted into a vehicle moving trajectory image through binarization and image pre-processing. Parameters of the moving vehicles are detected by utilizing a search-match method. A traffic volume, moving speeds, moving directions and locations are obtained respectively from detected trajectory number, and a tilt angle and pixel positions. The monitoring method is helpful to solve traffic congestion problem and informing drivers of real-time traffic volume, and contributes to realize an intelligent city traffic regulation.
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4.发明申请Online traffic volume monitoring system and method based on phase-sensitive optical time domain reflectometry 审中-公开基于相敏光时域反射测量的在线交通量监测系统及方法公开(公告)号：US20160275788A1
公开(公告)日：2016-09-22
申请号：US14694984
申请日：2015-04-23
Inventor： Huijuan Wu , Yunjiang Rao , Ya Qian , Hanyu Li
IPC: G08G1/04
Abstract: An online traffic volume monitoring system based on a phase-sensitive optical time domain reflectometry and its monitoring method are related to a field of intelligent transportation and an application of distributed fiber sensing. A vehicle moving temporal-spatial response graph is generated by accumulating differentiated Optical Time-Domain Reflectometry tracks at different moments in one unit monitoring period for traffic volume statistics, and then converted into a vehicle moving trajectory image through binarization and image pre-processing. Parameters of the moving vehicles are detected by utilizing a search-match method. A traffic volume, moving speeds, moving directions and locations are obtained respectively from detected trajectory number, and a tilt angle and pixel positions. The monitoring method is helpful to solve traffic congestion problem and informing drivers of real-time traffic volume, and contributes to realize an intelligent city traffic regulation.
Abstract translation: 基于相敏光时域反射测量及其监测方法的在线流量监测系统与智能交通领域和分布式光纤传感应用有关。 通过在一个单位监测周期内在不同时刻累积差分光时域反射测量轨迹来产生车辆移动时空响应图，用于交通量统计，然后通过二值化和图像预处理转换成车辆移动轨迹图像。 通过利用搜索匹配方法来检测移动车辆的参数。 分别从检测到的轨迹数以及倾斜角度和像素位置获得交通量，移动速度，移动方向和位置。 监测方法有助于解决交通拥堵问题，通知驾驶员实时交通量，有助于实现智能城市交通管制。
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5.发明授权公开(公告)号：US11562224B2
公开(公告)日：2023-01-24
申请号：US16057828
申请日：2018-08-08
Inventor： Huijuan Wu , Jiping Chen , Xiangrong Liu , Yao Xiao , Mengjiao Wang , Bo Tang , Mingru Yang , Haoyu Qiu , Yunjiang Rao
Abstract: A 1D-CNN-based ((one-dimensional convolutional neural network)-based) distributed optical fiber sensing signal feature learning and classification method is provided, which solves a problem that an existing distributed optical fiber sensing system has poor adaptive ability to a complex and changing environment and consumes time and effort due to adoption of manually extracted distinguishable event features. The method includes steps of: segmenting time sequences of distributed optical fiber sensing acoustic and vibration signals acquired at all spatial points, and building a typical event signal dataset; constructing a 1D-CNN model, conducting iterative update training of the network through typical event signals in a training dataset to obtain optimal network parameters, and learning and extracting 1D-CNN distinguishable features of different types of events through an optimal network to obtain typical event signal feature sets; and after training different types of classifiers through the typical event signal feature sets, screening out an optimal classifier.
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Patent Agency Ranking
6.发明申请公开(公告)号：US20190226908A1
公开(公告)日：2019-07-25
申请号：US16289657
申请日：2019-03-01
Inventor： Yunjiang Rao , Yun Fu
Abstract: A distributed acoustic sensing (DAS) system based on space-division multiplexing with multi-core fiber (MCF) is proposed. It relates to a technical field of distributed optical fiber sensing. The present invention maintains the advantage of single-ended measurement in the standard DAS system, and realizes the intensity accumulation of the Rayleigh backscattering light within each core of the MCF, which can greatly improve the strain resolution of DAS systems. Moreover, the introduction of optical switch can make different code sequences transmit in the different core of the MCF simultaneously, which can make the single-pulse response with coding gain demodulated without sacrificing the frequency responding bandwidth. Furthermore, the utilization of space-division multiplexing can make multiple pulses with precious time delay transmit in the MCF simultaneously, which can greatly improve the frequency responding bandwidth of DAS system.
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7.发明申请公开(公告)号：US20180156642A1
公开(公告)日：2018-06-07
申请号：US15874672
申请日：2018-01-18
Inventor： Zinan Wang , Ji Xiong , Lianlian Xie , Yunjiang Rao
Abstract: A method of improving measurement speed of distributed optical fiber sensors by adopting orthogonal signals and the system thereof is disclosed, which is related to the optical fiber sensor field and solves the problems that conventional technology will increasing the bandwidth of the received signal, reducing the signal-to-noise ratio of the received signal or distortion the spatial resolution of the system. The method comprises steps of generating N periodic orthogonal optical pulse sequence; injecting the N periodic orthogonal optical pulse sequence into the optical fiber under test(5); collecting the scattered light signal; demodulating the scattered light signal with the local oscillating light and then converting into digital signals; extracting the scatter information of the orthogonal optical pulses from the collected digital signals; and arranging the scattered information in order of precedence of the infusion. The measurement speed of the distributed optical fiber sensors is improved by N−1 times.
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8.发明申请Long-distance polarization and phase-sensitive optical time-domain reflectometry based on random laser amplification 审中-公开基于随机激光放大的长距离极化和相敏光时域反射测量公开(公告)号：US20140183360A1
公开(公告)日：2014-07-03
申请号：US14201915
申请日：2014-03-09
Inventor： Yunjiang Rao , Zinan Wang , Zengling Ran
IPC: G01M11/00
CPC classification number: G01D5/35354 , G01J1/42 , G01J5/10
Abstract: A long-distance polarization and phase-sensitive reflectometry based on random laser amplification for extending a sensing distance includes a long-distance polarization and phase-sensitive reflectometry of a distributed Raman amplification based on optical fiber random lasers generated by unilateral pumps, a long-distance polarization and phase-sensitive reflectometry of a distributed Raman amplification based on optical fiber random lasers generated by bilateral pumps, and a long-distance polarization and phase-sensitive reflectometry of a Raman amplification based on a combination of optical fiber random lasers generated by unilateral pumps and a common Raman pump source, which are applied in optical fiber perturbation sensing and have a capability of greatly improving a working distance of a sensing system and a high practicability.
Abstract translation: 基于用于扩展感测距离的随机激光放大的长距离偏振和相敏反射测量包括基于由单侧泵产生的光纤随机激光器的分布式拉曼放大的长距离偏振和相敏反射测量， 基于由双边泵生成的光纤随机激光器的分布式拉曼放大的距离偏振和相敏反射测量，以及基于单边产生的光纤随机激光器的组合的拉曼放大的长距离偏振和相敏反射测量 泵和普通的拉曼泵浦源，它们应用于光纤扰动感测中，具有大大提高感测系统工作距离和高实用性的能力。
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公开(公告)号：US10564012B2
公开(公告)日：2020-02-18
申请号：US15874672
申请日：2018-01-18
Inventor： Zinan Wang , Ji Xiong , Lianlian Xie , Yunjiang Rao
Abstract: A method of improving measurement speed of distributed optical fiber sensors by adopting orthogonal signals and the system thereof is disclosed, which is related to the optical fiber sensor field and solves the problems that conventional technology will increasing the bandwidth of the received signal, reducing the signal-to-noise ratio of the received signal or distortion the spatial resolution of the system. The method comprises steps of generating N periodic orthogonal optical pulse sequence; injecting the N periodic orthogonal optical pulse sequence into the optical fiber under test(5); collecting the scattered light signal; demodulating the scattered light signal with the local oscillating light and then converting into digital signals; extracting the scatter information of the orthogonal optical pulses from the collected digital signals; and arranging the scattered information in order of precedence of the infusion. The measurement speed of the distributed optical fiber sensors is improved by N−1 times.
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10.发明申请公开(公告)号：US20190058524A1
公开(公告)日：2019-02-21
申请号：US16166096
申请日：2018-10-20
Inventor： Yunjiang Rao , Yun Fu , Jiaqi Li , Zinan Wang
Abstract: A hybrid distributed amplification method based on a random fiber laser generated within erbium fiber with low doping concentration, i.e. weak erbium-doped fiber (WEDF), which includes: Step 1. constructing a fiber link via WEDF; Step 2. generating the random fiber laser based on the fiber link, the pump source, the wavelength division multiplexer and the strong feedback module; Step 3. constructing the spatial equalized gain based on hybrid gain of the erbium fiber and random fiber laser; Step 4. the signal is amplified by the hybrid spatial equalized gain. The present invention solves the typical problem of high laser threshold and low pump conversion efficiency when conventional fiber is used to generate random fiber laser for distributed amplification.
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