Patents by Inventor Junfeng Jiang

Junfeng Jiang 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: 20220180090
    Abstract: The present disclosure provides a neural network-based visual detection and tracking method of an inspection robot, which includes the following steps of: 1) acquiring environmental images of a dynamic background a movement process of the robot; 2) preprocessing the acquired images; 3) detecting human targets and specific behaviors in the images in the robot body, and saving the sizes, position information and features of the human targets with the specific behaviors; 4) controlling the orientation of a robot gimbal by using a target tracking algorithm to make sure that a specific target is always located at the central positions of the images; and 5) controlling the robot to move along with a tracked object. The neural network-based visual detection and tracking method of an inspection robot in the present disclosure has a quite high adaptive ability, achieves better detection and tracking effects on targets in a dynamic background scene.
    Type: Application
    Filed: June 16, 2021
    Publication date: June 9, 2022
    Inventors: Yongduan Song, Li Huang, Shilei Tan, Junfeng Lai, Huan Liu, Ziqiang Jiang, Jie Zhang, Huan Chen, Jiangyu Wu, Hong Long, Fang Hu, Qin Hu
  • Publication number: 20220171395
    Abstract: A method for obstacle detection and recognition for an intelligent snow sweeping robot is disclosed, comprising: 1) disposing ultrasonic sensors at a front end of the snow sweeping robot to detect distance information from an obstacle ahead; and disposing radar sensors at the front and rear of the snow sweeping robot to detect whether a creature suddenly approaches; 2) processing signals detected by each of the ultrasonic sensors and radar sensors, and calculating a forward distance of the snow sweeping robot; and 3) determining a snow cover extent of a working road, detecting a change of the distance from the obstacles, and recognizing the obstacles for conditions of an ultrasonic ranging variation ratio and a variation of the forward distance of the snow sweeping robot, a change of the signal detected by radar sensors, and a descriptive statistic of the snow cover extent within a specific time period.
    Type: Application
    Filed: July 22, 2021
    Publication date: June 2, 2022
    Applicant: Chongqing University
    Inventors: Yongduan Song, Ziqiang Jiang, Shilei Tan, Junfeng Lai, Huan Liu, Li Huang, Jie Zhang, Huan Chen, Hong Long, Fang Hu, Jiangyu Wu, Qin Hu, Wenqi Li
  • Publication number: 20220152817
    Abstract: The present disclosure discloses a neural network adaptive tracking control method for joint robots, which proposes two schemes: robust adaptive control and neural adaptive control, comprising the following steps: 1) establishing a joint robot system model; 2) establishing a state space expression and an error definition when taking into consideration both the drive failure and actuator saturation of the joint robot system; 3) designing a PID controller and updating algorithms of the joint robot system; and 4) using the designed PID controller and updating algorithms to realize the control of the trajectory motion of the joint robot. The present disclosure may solve the following technical problems at the same time: the drive saturation and coupling effect in the joint system, processing parameter uncertainty and non-parametric uncertainty, execution failure handling during the system operation, compensation for non-vanishing interference, and the like.
    Type: Application
    Filed: March 24, 2021
    Publication date: May 19, 2022
    Inventors: Yongduan SONG, Huan LIU, Junfeng LAI, Ziqiang JIANG, Jie ZHANG, Huan CHEN, Li HUANG, Congyi ZHANG, Yingrui CHEN, Yating YANG, Chunxu REN, Han BAO, Kuilong YANG, Ge SONG, Bowen ZHANG, Hong LONG
  • Patent number: 11255930
    Abstract: A Hall sensor trim circuit includes a current source, a transistor, a reference voltage circuit, an amplifier, and a Hall sensor. The transistor includes a first terminal, a second terminal, and a third terminal. The third terminal is coupled to the current source. The amplifier includes an output terminal, a first input terminal, and a second input terminal. The output terminal is coupled to the first terminal of the transistor. The first input terminal is coupled to the second terminal of the transistor. The second input terminal is coupled to the reference voltage circuit. The Hall sensor is coupled to the current source.
    Type: Grant
    Filed: July 21, 2020
    Date of Patent: February 22, 2022
    Assignee: Texas Instruments Incorporated
    Inventors: Junfeng Jiang, Julio E. Acosta, Srinivasan Venkataraman
  • Patent number: 11181400
    Abstract: The present invention discloses a Fiber Bragg Grating demodulation device with a suppressed fluctuation at a variable ambient temperature and a demodulation method. The device comprises a broadband light source (1), an optical attenuator (2), a tunable F-P filter (3), a first optical fiber isolator (41), an erbium-doped optical fiber amplifier (5), an optical fiber first-stage beam splitter (6), a first optical fiber second-stage beam splitter (71), optical fiber circulators (8), FBG sensor arrays (9), a first photoelectric detector array (161), an optical fiber gas cell (10), a second optical fiber second-stage beam splitter (72), an optical fiber F-P etalon (11), a notch filter (12), an optical fiber assisted interferometer (13), a data acquisition card (17) and a processor (18).
    Type: Grant
    Filed: October 27, 2016
    Date of Patent: November 23, 2021
    Assignee: Tianjin University
    Inventors: Junfeng Jiang, Tiegen Liu, Jinling Yan, Kun Liu, Shuang Wang, Xuezhi Zhang, Chuanjun Zang, Renwei Xie, Qiliang Chu
  • Publication number: 20210041509
    Abstract: A Hall sensor trim circuit includes a current source, a transistor, a reference voltage circuit, an amplifier, and a Hall sensor. The transistor includes a first terminal, a second terminal, and a third terminal. The third terminal is coupled to the current source. The amplifier includes an output terminal, a first input terminal, and a second input terminal. The output terminal is coupled to the first terminal of the transistor. The first input terminal is coupled to the second terminal of the transistor. The second input terminal is coupled to the reference voltage circuit. The Hall sensor is coupled to the current source.
    Type: Application
    Filed: July 21, 2020
    Publication date: February 11, 2021
    Inventors: Junfeng JIANG, Julio E. ACOSTA, Srinivasan VENKATARAMAN
  • Publication number: 20200249113
    Abstract: The present invention discloses a residual pressure measurement system for a MEMS pressure sensor with an F-P cavity and method thereof, the measurement system includes a low-coherence light source, a 3 dB coupler, a MEMS pressure sensor, an air pressure chamber, a thermostat, a pressure control system, a cavity length demodulator, an acquisition card and a computer. The measurement method comprises: performing cavity length measurement by using the reflecting light by the pressure control system at two temperatures, respectively, so as to calibrate the MEMS pressure sensor and establish a relationship between the absolute phase of a monochromatic frequency and the external pressure; performing linear fitting to the two measurement data to obtain all the external pressure when the cavity length of two measurement data are equal to each other, and substituting the theoretical equation for calculation to obtain the residual pressure under the flat condition of the diaphragm.
    Type: Application
    Filed: April 23, 2018
    Publication date: August 6, 2020
    Inventors: Shuang WANG, Junfeng JIANG, Tiegen LIU, Xue WANG, Kun LIU, Mengnan XIAO, Dongdong JU
  • Patent number: 10715138
    Abstract: An open drain driver circuit includes an output terminal, an input terminal, a first transistor, a second transistor, and a third transistor. The first transistor includes a first terminal coupled to the output terminal, and a second terminal coupled to a reference voltage source. The second transistor includes a first terminal coupled to a third terminal of the first transistor, a second terminal coupled to a power supply rail, and a third terminal coupled to the reference voltage source. The third transistor includes a first terminal coupled to the input terminal, a second terminal coupled to the reference voltage source, and a third terminal coupled to the third terminal of the first transistor.
    Type: Grant
    Filed: August 26, 2019
    Date of Patent: July 14, 2020
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Junfeng Jiang
  • Patent number: 10508938
    Abstract: Fiber optical Fabry-Perot flow test device with local bending diversion structure, having an inlet flange, a test tube and an outlet flange, with both a fiber optical Fabry-Perot pressure sensor at high-pressure-side and a fiber optical Fabry-Perot pressure sensor at low-pressure-side, which are fixedly connected to the test tube through an auxiliary connecting device.
    Type: Grant
    Filed: October 27, 2016
    Date of Patent: December 17, 2019
    Assignee: Tianjin University
    Inventors: Tiegen Liu, Junfeng Jiang, Huijia Yang, Kun Liu, Shuang Wang, Weihang Zhang
  • Patent number: 10365088
    Abstract: The present invention discloses a distributed device for simultaneously measuring strain and temperature based on optical frequency domain reflection, comprising a tunable laser, a 1:99 beam splitter, a main interferometer system, a light source phase monitoring system based on an auxiliary interferometer, an acquisition device and a computer processing unit, wherein the main interferometer system comprises two Mach-Zehnder interferometers, and two optical fibers having different cladding diameters are arranged in parallel as sensing fibers. Due to the difference in temperature and strain coefficients of optical fibers of the same diameter, the temperature and strain values during changing the temperature and strain simultaneously can be obtained by matrix operation, thereby achieving an effect of eliminating cross sensitivity of temperature and strain sensing in optical frequency domain reflection.
    Type: Grant
    Filed: October 27, 2016
    Date of Patent: July 30, 2019
    Assignee: Tianjin University
    Inventors: Zhenyang Ding, Di Yang, Tiegen Liu, Yang Du, Zhexi Xu, Kun Liu, Junfeng Jiang
  • Patent number: 10365126
    Abstract: A distributed optical fiber disturbance positioning system based on the asymmetric dual Mach-Zehnder interference, unlike traditional dual Mach-Zehnder distributed optical fiber disturbance sensing system, the present invention adopts two narrow-bandwidth optical sources (1a, 1b) and adopts corresponding DWDM (3a, 3b) before the detector (4a, 4b) to filter the backscatter noise of the optical fiber, and can solve the problems of having too low SNR due to backscatter influence when the sensing distance is long. The present invention also provides a positioning method for applying the system, which obtains the TFD of the disturbance frame signals by using the time-frequency analysis method based on the short-term average frequency, and takes the points near the point of maximum frequency as the effective signal segment for performing cross-correlation time delay estimation, thus obtaining the delay, and the disturbance position.
    Type: Grant
    Filed: October 27, 2016
    Date of Patent: July 30, 2019
    Assignee: Tianjin University
    Inventors: Kun Liu, Tiegen Liu, Junfeng Jiang, Chunyu Ma, Tianjiao Chai, Chang He, Miao Tian, Zhichen Li
  • Publication number: 20190178688
    Abstract: The present invention discloses a Fiber Bragg Grating demodulation device with a suppressed fluctuation at a variable ambient temperature and a demodulation method. The device comprises a broadband light source (1), an optical attenuator (2), a tunable F-P filter (3), a first optical fiber isolator (41), an erbium-doped optical fiber amplifier (5), an optical fiber first-stage beam splitter (6), a first optical fiber second-stage beam splitter (71), optical fiber circulators (8), FBG sensor arrays (9), a first photoelectric detector array (161), an optical fiber gas cell (10), a second optical fiber second-stage beam splitter (72), an optical fiber F-P etalon (11), a notch filter (12), an optical fiber assisted interferometer (13), a data acquisition card (17) and a processor (18).
    Type: Application
    Filed: October 27, 2016
    Publication date: June 13, 2019
    Applicant: Tianjin University
    Inventors: Junfeng JIANG, Tiegen LIU, Jinling YAN, Kun LIU, Shuang WANG, Xuezhi ZHANG, Chuanjun ZANG, Renwei XIE, Qiliang CHU
  • Publication number: 20190121048
    Abstract: The present invention discloses an optical fiber laying method by using Archimedes spiral in optical frequency domain reflection, wherein the optical fiber laying method comprises the following steps: performing two measurements continuously via a two-dimensional strain sensing device, and performing cross-correlation operation on the two one-dimensional information of the local distance domain, and obtaining the strain variation of the one-dimensional information corresponding to the two measurements from the obtained cross-correlation information; deriving the two-dimensional angle information and curvature radius information of the plane to be measured corresponding to one-dimensional information in the local distance domain based on Archimedes spiral formula; deriving the position coordinates corresponding to the two-dimensional plane based on the curvature radius information and two-dimensional angle information; corresponding the strain variation of the one-dimensional information to the position coordi
    Type: Application
    Filed: October 26, 2016
    Publication date: April 25, 2019
    Applicant: Tianjin University
    Inventors: Tiegen LIU, Zhenyang DING, Di YANG, Kun LIU, Junfeng JIANG, Zhexi XU
  • Publication number: 20190011253
    Abstract: The present invention discloses a distributed device for simultaneously measuring strain and temperature based on optical frequency domain reflection, comprising a tunable laser, a 1:99 beam splitter, a main interferometer system, a light source phase monitoring system based on an auxiliary interferometer, an acquisition device and a computer processing unit, wherein the main interferometer system comprises two Mach-Zehnder interferometers, and two optical fibers having different cladding diameters are arranged in parallel as sensing fibers. Due to the difference in temperature and strain coefficients of optical fibers of the same diameter, the temperature and strain values during changing the temperature and strain simultaneously can be obtained by matrix operation, thereby achieving an effect of eliminating cross sensitivity of temperature and strain sensing in optical frequency domain reflection.
    Type: Application
    Filed: October 27, 2016
    Publication date: January 10, 2019
    Applicant: Tianjin University
    Inventors: Zhenyang DING, Di YANG, Tiegen LIU, Yang DU, Zhexi XU, Kun LIU, Junfeng JIANG
  • Publication number: 20180292240
    Abstract: A distributed optical fiber disturbance positioning system based on the asymmetric dual Mach-Zehnder interference, unlike traditional dual Mach-Zehnder distributed optical fiber disturbance sensing system, the present invention adopts two narrow-bandwidth optical sources (1a, 1b) and adopts corresponding DWDM (3a, 3b) before the detector (4a, 4b) to filter the backscatter noise of the optical fiber, and can solve the problems of having too low SNR due to backscatter influence when the sensing distance is long. The present invention also provides a positioning method for applying the system, which obtains the TFD of the disturbance frame signals by using the time-frequency analysis method based on the short-term average frequency, and takes the points near the point of maximum frequency as the effective signal segment for performing cross-correlation time delay estimation, thus obtaining the delay, and the disturbance position.
    Type: Application
    Filed: October 27, 2016
    Publication date: October 11, 2018
    Applicant: Tianjin University
    Inventors: Kun LIU, Tiegen LIU, Junfeng JIANG, Chunyu MA, Tianjiao CHAI, Chang HE, Miao TIAN, Zhichen LI
  • Publication number: 20180283969
    Abstract: The present invention discloses a high-resolution polarized low-coherence interference pressure measurement device and method, which comprise a broadband light source (1), an optical fiber coupler (2), an optical fiber Fabry-Perot sensor (3), a collimating lens (4), a polarizer (5), a birefringence wedge (6) having a spatial dip angle, an analyzer (7), a matrix camera (8), and a signal processing unit (9), which are successively provided from an input end to an output end; wherein light emitted from the broadband light source (1) passes through the optical fiber coupler (2) and arrives at the optical fiber Fabry-Perot sensor (3), and returned light emitted from the optical fiber Fabry-Perot sensor (3) is led into a demodulation interferometer; a change in pressure is transformed into a change in length of a Fabry-Perot cavity by the optical fiber Fabry-Perot sensor (3), and different pressures correspond to different lengths of the Fabry-Perot cavity; the collimating lens (4), the polarizer (5), the birefring
    Type: Application
    Filed: October 27, 2016
    Publication date: October 4, 2018
    Applicant: Tianjin University
    Inventors: Shuang WANG, Tiegen LIU, Junfeng JIANG, Mengnan XIAO, Kun LIU, Pan HE
  • Patent number: 9709974
    Abstract: The present invention discloses a real-time kernel of open CNC systems and a real-time control method of tool-paths. The real-time kernel translates a real-time control of the tool-paths into sending synchronous pulses into the servo drivers in accordance with the control rhythms ?ti (i=1, . . . , n) in the follow-table and achieves the openness of real-time control method and real-time control process. The real-time kernel has the most simple and reliable multi-axis synchronization capability with high-speed and high-precision, and leads to major changes in the field of digital control method. The real-time kernel no need to configure a real-time operating system and a fieldbus, its core function is only to write the control rhythm into the T-division timer, and to send linkage commands into the servo drivers designated by the state-word, therefore its function and architecture are extremely simple and high reliability.
    Type: Grant
    Filed: July 6, 2012
    Date of Patent: July 18, 2017
    Inventor: Junfeng Jiang
  • Patent number: 9529813
    Abstract: The invention discloses a computer-aided numerical control method and system, and changed the computer numerical control (CNC) to the computer-aided numerical control (CANC). Based on discrete geometry and discrete kinematics, the invention is constructed a technical solution of a related data flow file, it is completely solved the optimization of discrete position information and the axis smoothness. The invention is used to manufacture digital control information. Through the three-dimensional graphical interface, therefore completely achieved the software implementation for R&D of CNC technologies and reconfiguration of CNC systems, and is created an open platform for R&D of CNC technologies and CNC systems. The related data flow file, as a computer program product, will be commercializing digital control information, and then will be expediting a new industry namely digital control information manufacture industry.
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: December 27, 2016
    Inventor: Junfeng Jiang
  • Patent number: 9384780
    Abstract: The disclosed method calculates video time density functions based on inter-frame mutual information or other similarity measures. The method includes acquiring a video sequence from memory, computing mutual information or other similarity measures between two consecutive frames of the video sequence, and constructing a video temporal density function based on the mutual information or similarity measures. The method enables fast navigation of the video sequence by performing a temporal quantization of the video time density function to determine a set of quanta. The video sequence can be navigated using the nearest neighbor video frames to the set of quanta. The method enables thumbnail extraction of a video sequence using statistical modeling by performing a temporal quantization of the video time density function to segment video sequence in time domain and using mixture (such as Gaussian mixture and ICA mixture) vector quantization to find the sample frames for each temporal segment.
    Type: Grant
    Filed: April 7, 2014
    Date of Patent: July 5, 2016
    Inventors: Xiaoping Zhang, Junfeng Jiang
  • Publication number: 20160124981
    Abstract: The invention discloses a computer-aided numerical control method and system, and changed the computer numerical control (CNC) to the computer-aided numerical control (CANC). Based on discrete geometry and discrete kinematics, the invention is constructed a technical solution of a related data flow file, it is completely solved the optimization of discrete position information and the axis smoothness. The invention is used to manufacture digital control information. Through the three-dimensional graphical interface, therefore completely achieved the software implementation for R&D of CNC technologies and reconfiguration of CNC systems, and is created an open platform for R&D of CNC technologies and CNC systems. The related data flow file, as a computer program product, will be commercializing digital control information, and then will be expediting a new industry namely digital control information manufacture industry.
    Type: Application
    Filed: August 4, 2011
    Publication date: May 5, 2016
    Inventor: Junfeng Jiang