Patents by Inventor Junqiang Hu

Junqiang Hu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220247562
    Abstract: Physimetric-based data security for coded distributed temperature sensing (DTS) in which physimetric information is extracted from a coded-DTS interrogator which is unique for each interrogator at each operating run time—and used to reconstruct a final temperature determination from DTS data. The physimetric information includes coded-DTS pulse code and coded-DTS pulse profile information as a key to permit secure sharing with authorized users. The pulse code and pulse profile information are encrypted and made available to an authorized user. The authorized user can then decrypt the pulse code and pulse profile information and subsequently use this key information (pulse profile and pulse code files) to retrieve temperature information from for example, a remote computer providing a continuous raw data feed—without being susceptible to eavesdropping.
    Type: Application
    Filed: January 31, 2022
    Publication date: August 4, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Qiang WANG, Junqiang HU, Jian FANG, Yaowen LI, Ting WANG
  • Patent number: 11391622
    Abstract: An optical fiber sensing system with reduced spatial resolution and noise for multiple applications and method of operating same that employs a coherent receiver configured to detect and digitize both I and Q signals in two polarizations and performs signal beating in a digital signal processor (DSP) using the polarization-diverse signals to obtain beating results for multiple polarization state pairs that effectively reduces polarization induced fading effect(s) while providing faster sensing speed(s) and more efficient filtering. Since Rayleigh signals are captured in two orthogonal polarizations, four beating products are determined at once in the DSP and all are used for fiber strain determination thereby avoiding polarization fading.
    Type: Grant
    Filed: February 5, 2020
    Date of Patent: July 19, 2022
    Inventors: Ezra Ip, Yue-Kai Huang, Junqiang Hu, Philip Ji, Shuji Murakami, Yaowen Li
  • Patent number: 11387926
    Abstract: Aspects of the present disclosure describe a computer implemented method for the transfer of sensor data on dynamic software defined network (SDN) controlled optical network.
    Type: Grant
    Filed: October 24, 2020
    Date of Patent: July 12, 2022
    Inventors: Ting Wang, Junqiang Hu, Shailendra Gaikwad
  • Publication number: 20220187121
    Abstract: Aspects of the present disclosure describe systems, methods and structures for coherent distributed sensing that employs a moving average method among locations along a sensing fiber employing a user configured number of taps that involves location grouping and a group's internal phase alignment followed by an inter-group phase alignment and combining. Our method employs two steps of rotation to achieve the alignment: intra-group rotation and inter-group rotation to align the phase of all participating sensing fiber locations.
    Type: Application
    Filed: December 12, 2021
    Publication date: June 16, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Junqiang HU, Yue-Kai HUANG, Ezra IP
  • Publication number: 20220146304
    Abstract: Aspects of the present disclosure are directed to improved systems, methods, and structures providing coherent detection of DAS. In sharp contrast to the prior art, systems, methods, and structures according to aspects of the present disclosure advantageously reduce the beating diversity terms such that required memory and bandwidth are reduced over the art.
    Type: Application
    Filed: November 9, 2021
    Publication date: May 12, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventor: Junqiang HU
  • Publication number: 20220128384
    Abstract: Aspects of the present disclosure describe systems methods and structures for avoiding saturation caused phase jump in systems that extract information from the phase of a complex sequence and exhibit an overflow or “spike” in the output of a high-pass filter. Operationally, during phase unwrapping—when an output signal exceeds a supported range—it is adjusted to be back in range by adding N·2?, to a phase where N is negative or positive integer, depending on the direction to be adjusted.
    Type: Application
    Filed: October 26, 2021
    Publication date: April 28, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventor: Junqiang HU
  • Publication number: 20220120608
    Abstract: Aspects of the present disclosure describe a polarization diversity combining method for coherent distributed acoustic sensing (DAS) maintaining phase continunity.
    Type: Application
    Filed: October 20, 2021
    Publication date: April 21, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Junqiang HU, Yue-Kai HUANG, Ezra IP
  • Publication number: 20210356317
    Abstract: Aspects of the present disclosure describe a coherent distributed acoustic sensing (DAS) method employing a combined complex and phase domain vibration strength estimation are employed to produce a distributed acoustic sensing output signal exhibiting mitigated Rayleigh fading effect. Operationally, a phase-domain estimator is regulated by a complex-domain estimator that provides Rayleigh fading information associated with each DAS fiber segment, which in turn is used to determine if/how a phase-domain estimator is affected by fading. In the occurrence of severe fading, the complex-domain estimator is used to produce an indication of vibration strength, wherein noise occurring in that estimator is not amplified as would be in the phase-domain estimator.
    Type: Application
    Filed: May 11, 2021
    Publication date: November 18, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Ezra IP, Junqiang HU, Yue-Kai HUANG
  • Publication number: 20210318162
    Abstract: Distributed fiber optic sensing systems (DFOS) methods, and structures that employ DVS/DAS point sensors and a two-stage processing methodology/structure that advantageously enable point sensors to send sensor data at any time—thereby providing significant processing advantages over the prior art.
    Type: Application
    Filed: April 7, 2021
    Publication date: October 14, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Junqiang HU, Ting WANG
  • Patent number: 11131578
    Abstract: Aspects of the present disclosure describe systems, methods and structures employing two-stage detection/analysis for distributed vibration sensing (DVS) along an optical fiber in which a first stage provides pre-processed signal data and the second stage—based on the first stage result—only processes locations that have or might have vibrational activity resulting in increased sensitivity and reduced false alarms.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: September 28, 2021
    Inventors: Junqiang Hu, Ting Wang
  • Publication number: 20210255007
    Abstract: Aspects of the present disclosure describe distributed optical fiber sensing systems, methods, and structures that advantageously employ point sensors that send sensory data/information over an attached, distributed optical fiber sensor without using a separate network or communications facility.
    Type: Application
    Filed: January 12, 2021
    Publication date: August 19, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Junqiang HU, Ting WANG
  • Patent number: 11054303
    Abstract: Disclosed are improved distributed optical fiber sensing systems, methods, and structures employing disparate point sensors that utilize uni-directional signal transmission via the distributed optical fiber such that a separate communications network for the disparate point sensors is not required.
    Type: Grant
    Filed: February 5, 2020
    Date of Patent: July 6, 2021
    Inventors: Junqiang Hu, Ting Wang
  • Publication number: 20210123798
    Abstract: Aspects of the present disclosure describe a computer implemented method for the transfer of sensor data on dynamic software defined network (SDN) controlled optical network.
    Type: Application
    Filed: October 24, 2020
    Publication date: April 29, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Ting Wang, Junqiang Hu, Shailendra Gaikwad
  • Publication number: 20200370950
    Abstract: Aspects of the present disclosure describe Rayleigh fading mitigation via short pulse coherent distributed acoustic sensing with multi-location beating-term combination. In illustrative configurations, systems, methods, and structures according to the present disclosure employ a two stage modulation arrangement providing short interrogator pulses resulting in a greater number of sensing data points and reduced effective sectional length. The increased number of data points are used to mitigate Rayleigh fading via a spatial combining process, multi-location-beating combining (MLBC) which uses weighted complex-valued DAS beating results from neighboring locations and aligns phase signals of each of the locations, before combining them to produce a final DAS phase measurement. Since Rayleigh scattering is a random statistic, the MLBC process allows capture of different statics from neighboring locations with correlated vibration/acoustic signal.
    Type: Application
    Filed: May 20, 2020
    Publication date: November 26, 2020
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Ezra IP, Yue-Kai HUANG, Junqiang HU, Shuji MURAKAMI
  • Patent number: 10797789
    Abstract: Aspects of the present disclosure describe systems, methods and structures for distributed fiber sensing systems including interrogator and attached fiber in which the interrogator includes a common line card and function-specific, pluggable front end in which the line card is configurable and supports different signal processing paths and automatically senses the front-end type and uses corresponding firmware/software or signal processing path(s) to process sensed data.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: October 6, 2020
    Assignee: NEC Corporation
    Inventors: Junqiang Hu, Ting Wang
  • Publication number: 20200249076
    Abstract: Aspects of the present disclosure describe optical fiber sensing systems, methods and structures and application employing coherent detection of backscattered signals.
    Type: Application
    Filed: February 5, 2020
    Publication date: August 6, 2020
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Ezra IP, Yue-Kai HUANG, Junqiang HU, Philip JI, Shuji MURAKAMI, Yaowen LI
  • Publication number: 20200249078
    Abstract: Disclosed are improved distributed optical fiber sensing systems, methods, and structures employing disparate point sensors that utilize uni-directional signal transmission via the distributed optical fiber such that a separate communications network for the disparate point sensors is not required.
    Type: Application
    Filed: February 5, 2020
    Publication date: August 6, 2020
    Applicant: NEC Laboratories America, Inc.
    Inventors: Junqiang HU, Ting WANG
  • Publication number: 20200003612
    Abstract: Aspects of the present disclosure describe systems, methods and structures employing a two-stage detection for distributed vibration detection (DVS) in which a first step provides an abstracted/pre-processing data and the second step—based on the first step result—only processes locations that have or might have activity.
    Type: Application
    Filed: June 27, 2019
    Publication date: January 2, 2020
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Junqiang HU, Ting WANG
  • Publication number: 20200007228
    Abstract: Aspects of the present disclosure describe systems, methods and structures for distributed fiber sensing systems including interrogator and attached fiber in which the interrogator includes a common line card and function-specific, pluggable front end in which the line card is configurable and supports different signal processing paths and automatically senses the front-end type and uses corresponding firmware/software or signal processing path(s) to process sensed data.
    Type: Application
    Filed: June 27, 2019
    Publication date: January 2, 2020
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Junqiang HU, Ting WANG
  • Patent number: 10010732
    Abstract: Aspects of the present disclosure describe apparatus, methods and systems for monitoring the operational status of fire extinguishers through the utilization of optically sensed, color profile determinations of a pressure gauge positioned on the fire extinguisher as well as the utilization of vibrational, and location sensing devices. Advantageously, monitoring apparatus according to the present disclosure are networkable, and a number of their operational characteristics may be configured via the network and associated servers. Furthermore, monitoring apparatus according to the present disclosure may employ vibrational, acceleration, GPS, RFID, and ultrasonic sensors to detect movement, location, and obstructions. In sharp contrast to the prior art, apparatus, methods and systems according to the present disclosure operate with existing fire extinguishers and provide a convenient, cost effective, and highly functional upgrade path for deployed fire extinguishers.
    Type: Grant
    Filed: January 23, 2017
    Date of Patent: July 3, 2018
    Assignee: NEC Corporation
    Inventors: Junqiang Hu, Ting Wang