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公开(公告)号：WO2023091450A1
公开(公告)日：2023-05-25
申请号：PCT/US2022/050049
申请日：2022-11-16
Applicant: NEC LABORATORIES AMERICA, INC.
Inventor： HUANG, Ming-Fang , JI, Philip , HAN, Shaobo , WANG, Ting
Abstract: Systems, methods, and structures for efficiently identifying individual fibers located in a deployed cable that advantageously reduces laborious field efforts while reducing service outage time. The systems and methods locate a targeted fiber in a cable ("Cable ID") and then identify the targeted fiber ("Fiber ID") by detecting DFOS signal attentions – without cutting the optical fiber. Two distinct determinations may be made namely, Cable ID and Fiber ID. DFOS operation detects vibration signals occurring along a sensor fiber. As implemented, Cable ID is an interactive-machine learning-based algorithm that automatically locates cable position along a sensor fiber route. Fiber ID detects a signal attenuation by bending a group of fibers with bifurcation to pinpoint a targeted individual fiber within a fiber cable.
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公开(公告)号：WO2023081249A1
公开(公告)日：2023-05-11
申请号：PCT/US2022/048763
申请日：2022-11-03
Applicant: NEC LABORATORIES AMERICA, INC.
Inventor： HAN, Shaobo , HUANG, Ming-Fang , CHEN, Yuheng , WANG, Ting , ZHONG, Sheng
Abstract: A method for underground cable localization by fast time series template matching and distributed fiber optic sensing (DFOS) includes: providing the DFOS system including a length of optical sensor fiber; a DFOS interrogator in optical communication with the optical sensor fiber, said DFOS interrogator configured to generate optical pulses, introduce the generated pulses into the length of optical sensor fiber, and receive backscattered signals from the length of the optical sensor fiber; and an intelligent analyzer configured to analyze DFOS data received by the DFOS interrogator and determine from the backscattered signals, vibrational activity occurring at locations along the length of the optical sensor fiber; deploying a programmable vibration generator to a field location proximate to the length of optical sensor fiber; transmitting to the programmable vibration generator a unique vibration pattern to be generated by the vibration generator; and operating the programmable vibration generator to generate the unique vibration pattern transmitted; and operating the DFOS system and collecting / analyzing the determined vibrational activity to further determine vibrational activity indicative of the unique vibration pattern generated by the vibration generator.
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公开(公告)号：WO2023069567A1
公开(公告)日：2023-04-27
申请号：PCT/US2022/047200
申请日：2022-10-20
Applicant: NEC LABORATORIES AMERICA, INC.
Inventor： MOSLEMI, Ramin , ROH, Junha , NOCHUR NARAYANAN, Sriram
Abstract: Navigational systems and methods include building a topological graph of an environment using nodes that represent locations in the space and associated directions, with frontiers associated with particular nodes and directions within the topological graph. An action is determined using a policy trained with an action reward function that weighs exploration to find new objects and moving objects to a goal. An agent navigates within the environment in accordance with the determined action.
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4.发明申请
公开(公告)号：WO2023004085A1
公开(公告)日：2023-01-26
申请号：PCT/US2022/037943
申请日：2022-07-21
Applicant: NEC LABORATORIES AMERICA, INC.
Inventor： DING, Yangmin , OZHAHAR, Sarper , TIAN, Yue , WANG, Ting , XU, Yuanda
Abstract: Systems, and methods for monitoring galloping of overhead transmission lines using distributed fiber optic sensing (DFOS) in combination with frequency domain decomposition (FDD) (frequency domain) algorithms/methods. A DFOS interrogator / analyzer is used to collect real-time data for pre-processing. The pre-processed data is further processed by processing algorithms, which provide results to a graphical user interface or other reporting mechanisms that provide real-time monitoring, alarming, and reporting of the galloping status of the overhead transmission lines.
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5.发明申请
公开(公告)号：WO2022217122A1
公开(公告)日：2022-10-13
申请号：PCT/US2022/024118
申请日：2022-04-08
Applicant: NEC LABORATORIES AMERICA, INC.
Inventor： HAN, Shaobo , MIN, Renqiang , LI, Tingfeng
Abstract: A reinforcement learning based approach to the problem of query object localization, where an agent is trained to localize objects of interest specified by a small exemplary set. We learn a transferable reward signal formulated using the exemplary set by ordinal metric learning. It enables test-time policy adaptation to new environments where the reward signals are not readily available, and thus outperforms fine-tuning approaches that are limited to annotated images. In addition, the transferable reward allows repurposing of the trained agent for new tasks, such as annotation refinement, or selective localization from multiple common objects across a set of images. Experiments on corrupted MNIST dataset and CU-Birds dataset demonstrate the effectiveness of our approach.
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Patent Agency Ranking
公开(公告)号：WO2022125586A2
公开(公告)日：2022-06-16
申请号：PCT/US2021/062266
申请日：2021-12-07
Applicant: NEC LABORATORIES AMERICA, INC.
Inventor： YAMAN, Fatih , FUJISAWA, Shinsuke , BATSHON, Hussam , YOSHINARI, Takigawa , AIDA, Ryuji , INOUE, Takanori , RODRIGUEZ, Eduardo , INADA, Yoshihisa
IPC: G02B6/35 , H04B10/80 , G02B6/4427 , G02B6/506 , H04J14/0221
Abstract: Aspects of the present disclosure describe systems, methods and structures directed to an integrated 3-way branching unit switch module suitable for undersea application.
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7.发明申请
公开(公告)号：WO2022120087A1
公开(公告)日：2022-06-09
申请号：PCT/US2021/061665
申请日：2021-12-02
Applicant: NEC LABORATORIES AMERICA, INC.
Inventor： YAMAN, Fatih , NAKAMURA, Kohei , INOUE, Takanori , RODRIGUEZ, Eduardo , FUJISAWA, Shinsuke , BATSHON, Hussam , INADA, Yoshihisa
Abstract: Aspects of the present disclosure describe systems, methods. and structures in which guided acoustic Brillouin (GAWBS) noise is measured using a homodyne measurement technique and demonstrated using a number of optical fibers, such fibers being commonly used in contemporary optical communications systems. The measurements are made with single spans and determined to be consistent with separate multi-span long-distance measurements. Additionally, a technique for preparing an optical fiber exhibiting superior GAWBS noise characteristics by reducing coherence length of the optical fiber by spinning the fiber at a high rate during the drawing process such that birefringence coherence length is reduced.
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8.发明申请
公开(公告)号：WO2021236848A1
公开(公告)日：2021-11-25
申请号：PCT/US2021/033269
申请日：2021-05-19
Applicant: NEC LABORATORIES AMERICA, INC.
Inventor： IP, Ezra , HUANG, Yue-Kai
Abstract: Aspects of the present disclosure describe systems, methods, and structures for distributed acoustic sensing using multi-band time-gated digital orthogonal frequency domain reflectometry.
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9.发明申请
公开(公告)号：WO2021211391A1
公开(公告)日：2021-10-21
申请号：PCT/US2021/026761
申请日：2021-04-11
Applicant: NEC LABORATORIES AMERICA, INC.
Inventor： DING, Yangmin , TIAN, Yue , OZHAHAR, Sarper , WANG, Ting
Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously enable and/or facilitate the continuous monitoring and identification of damaged utility poles by employing a DFOS distributed acoustic sensing (DAS) methodology in conjunction with a finite element analysis and operational modal analysis. Of particular advantage and in further contrast to the prior art, systems, methods, and structures according to aspects of the present disclosure utilize existing optical fiber supported/suspended by the utility poles as a sensing medium for the DFOS / DAS operation.
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10.发明申请
公开(公告)号：WO2021211307A1
公开(公告)日：2021-10-21
申请号：PCT/US2021/025476
申请日：2021-04-01
Applicant: NEC LABORATORIES AMERICA, INC.
Inventor： WANG, Qiang , LI, Yaowen
Abstract: Aspects of the present disclosure describe distributed fiber optic sensing systems (DFOSa), methods, and structures for distributed temperature sensing (DTS) that 1) employs a GmAPD instead of a traditional LmAPD detector which advantageously produces a 10~20 dB gain improvement of SNR for a far-end weak signal, thereby improving long range detectability; 2) employs an inventive gating scheme that advantageously and surprisingly overcomes the dead time problem for GmAPD working in SPC mode that plagues Geiger mode operation; and 3) third, employs an inventive post-processing technique that advantageously allows our methods to correct any dark noise caused signal distortion.
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