Patents by Inventor Xiaofeng Jin

Xiaofeng Jin 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: 20210226700
    Abstract: A measurement device for polarization-maintaining optical fiber spindle difference delay is provided. The measurement device comprises a polarization-maintaining fiber (PM) Sagnac interferometer, a signal generator, a microwave detector, a microprocessor. The PM Sagnac interferometer comprises a laser, a photoelectric modulator, and a PM fiber coupler that are connected in sequence. The PM Sagnac interferometer further comprises an optical fiber interface J1 and an optical fiber interface J2 arranged at the two output ends of the PM fiber coupler, a PM fiber to be measured located between the fiber interface J1 and the fiber interface J2, and a photodetector arranged at the other output end of the PM fiber coupler.
    Type: Application
    Filed: March 7, 2021
    Publication date: July 22, 2021
    Inventors: Xiaofeng JIN, Donglin Qin, Chenghui ZHANG, Xiangdong JIN, Xianbin YU, Shilie ZHENG, Xianmin ZHANG, Bo CONG
  • Patent number: 10979143
    Abstract: A frequency chirp correction method for the photonic time-stretch system comprises acquiring the stretching signal, i.e. acquiring the time-domain data after the time-domain stretching. First, the time-domain data of the stretching signal is Fourier transformed to obtain the spectral distribution. The spectral distribution is then convoluted with the first frequency-domain correction factor, and then multiplied with the second frequency-domain correction factor to obtain the modified frequency spectrum. Finally, the modified frequency spectrum is performed by the inverse Fourier transform to obtain the time-domain signal after the frequency chirp correction.
    Type: Grant
    Filed: February 13, 2020
    Date of Patent: April 13, 2021
    Assignee: ZHEJIANG UNIVERSITY
    Inventors: Changqiao Liu, Xiaofeng Jin, Xianbin Yu, Xiangdong Jin, Xianmin Zhang, Shilie Zheng, Qinggui Tan, Bo Cong
  • Publication number: 20210033452
    Abstract: A frequency modulation demodulator based on fiber grating sensor array comprises: a laser, radio frequency signal source, acousto-optic modulator, delay fiber pair, Mach-Zehnder modulator, optical filter, optical amplifier, optical isolator, circulator, fiber grating sensor array, photodetector and data acquisition card. By the cooperation of delay fiber pair and the fiber grating, the reflected optical pulses of the two gratings (the front grating and the back grating) are overlapped in the time domain to form interference, and thereby achieving multi-point array interference demodulation.
    Type: Application
    Filed: August 1, 2020
    Publication date: February 4, 2021
    Inventors: Xiaofeng JIN, Zhiwei CHENG, Jianhai OU, Xiangdong JIN, Yijie DU, Yinfang XIE
  • Patent number: 10882833
    Abstract: The present invention discloses a phenylate derivative, a preparation method therefor, and a pharmaceutical composition and uses thereof. Specifically, the invention relates to phenylate derivatives represented by formula (I), a pharmaceutically-acceptable salt thereof, a stereoisomer thereof, a preparation method therefor, a pharmaceutical composition containing the one or more compounds, and uses of the compounds in treating diseases related to PD-1/PD-L1 signal channels, such as cancers, infectious diseases and autoimmune diseases.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: January 5, 2021
    Assignees: Institute of Materia Medica, Chinese Academy of Medical Sciences, Tianjin Chase Sun Pharmaceutical Co., LTD
    Inventors: Zhiqiang Feng, Xiaoguang Chen, Yang Yang, Chuan Zhou, Fangfang Lai, Ming Ji, Xiaofeng Jin, Nina Xue, Yi Zheng, Hao Chen, Ling Li
  • Publication number: 20200378825
    Abstract: A transfer impedance calibration device for transducers based on spatial frequency domain smoothing technology is provided. The calibration device comprises a signal transmitter, a power amplifier, a transducer pair, a measurement amplifier, a signal collector, a measurement processor and a current sampler. The device extracts acoustic channel information through the sound filed spatial information or measurement method to design a spatial domain smoothing filter, and then comprehensively processes the transmitted current signal and the received signal through the spatial frequency domain smoothing technology to obtain the transfer impedance of the transducer pair.
    Type: Application
    Filed: April 29, 2020
    Publication date: December 3, 2020
    Inventors: Yi CHEN, Liuqing YANG, Xiaofeng JIN, Guanghui JIA, Han ZHAO
  • Publication number: 20200355843
    Abstract: A method of free-field broadband calibration of hydrophone sensitivity based on pink noise, relating to the field of free-field underwater acoustic measurement, and is mainly used for broadband measurements of hydrophone sensitivity in free-field. The method of the present disclosure is to transmit a broadband pink noise signal by controlling the signal source, and to perform the synchronous processing and FFT to the transmitted current signal and the received voltage signal, such as interception and zero padding, and finally obtain the transfer function in the frequency domain; by analyzing the direct wave and the reflected wave in the water tank, the transfer function is averaged by a rectangular window to eliminate the influence of the reverberation of the reflected wave in the water tank, so as to obtain the broadband transfer function of the free-field between the transmitting transducer and the hydrophone.
    Type: Application
    Filed: April 29, 2020
    Publication date: November 12, 2020
    Inventors: Yi CHEN, Guanghui JIA, Xiaofeng JIN, Liuqing YANG, Han ZHAO
  • Patent number: 10784967
    Abstract: A photonic radio-frequency receiver with mirror frequency suppression function, in which a single modulator is utilized to form a photoelectric oscillator so as to generate high-quality and low-phase-noise optically generated local oscillators, without the need for an external local oscillator source, and at the same time, another radio-frequency port is used as a radio-frequency signal input port, thereby allowing a compact structure. By properly setting a bias point for the two-electrode modulator and orthogonally synthesizing two branches of intermediate frequency signals respectively generated by the upper and lower sideband beat frequencies of the modulated optical signal, the photonic radio-frequency receiver realizes the functions of receiving radio-frequency signals and suppressing mirror frequency signals. The present disclosure can realize a photonic mirror-frequency suppression receiver.
    Type: Grant
    Filed: February 12, 2020
    Date of Patent: September 22, 2020
    Assignee: ZHEJIANG UNIVERSITY
    Inventors: Xiaofeng Jin, Kang Xiao, Jichen Qiu, Xiangdong Jin, Xianbin Yu, Qinggui Tan, Bo Cong
  • Publication number: 20200274616
    Abstract: A frequency chirp correction method for the photonic time-stretch system comprises acquiring the stretching signal, i.e. acquiring the time-domain data after the time-domain stretching. First, the time-domain data of the stretching signal is Fourier transformed to obtain the spectral distribution. The spectral distribution is then convoluted with the first frequency-domain correction factor, and then multiplied with the second frequency-domain correction factor to obtain the modified frequency spectrum. Finally, the modified frequency spectrum is performed by the inverse Fourier transform to obtain the time-domain signal after the frequency chirp correction.
    Type: Application
    Filed: February 13, 2020
    Publication date: August 27, 2020
    Inventors: Changqiao LIU, Xiaofeng JIN, Xianbin YU, Xiangdong JIN, Xianmin ZHANG, Shilie ZHENG, Qinggui TAN, Bo CONG
  • Publication number: 20200266900
    Abstract: A photonic radio-frequency receiver with mirror frequency suppression function, in which a single modulator is utilized to form a photoelectric oscillator so as to generate high-quality and low-phase-noise optically generated local oscillators, without the need for an external local oscillator source, and at the same time, another radio-frequency port is used as a radio-frequency signal input port, thereby allowing a compact structure. By properly setting a bias point for the two-electrode modulator and orthogonally synthesizing two branches of intermediate frequency signals respectively generated by the upper and lower sideband beat frequencies of the modulated optical signal, the photonic radio-frequency receiver realizes the functions of receiving radio-frequency signals and suppressing mirror frequency signals. The present disclosure can realize a photonic mirror-frequency suppression receiver.
    Type: Application
    Filed: February 12, 2020
    Publication date: August 20, 2020
    Inventors: Xiaofeng JIN, Kang XIAO, Jichen QIU, Xiangdong JIN, Xianbin YU, Qinggui TAN, Bo CONG
  • Patent number: 10650198
    Abstract: The present invention provides a method and an apparatus for detecting anti-skimming magnetic interference, wherein the method comprises the steps of: S1: generating an original magnetic strip signal; acquiring an interfered magnetic strip signal by combining the original magnetic strip signal and an interference signal of an electromagnetic interference source to be tested; S2: decoding the interfered magnetic strip signal to obtain a decoded parameter; and S3: determining whether an original magnetic strip parameter is consistent with the decoded parameter; if so, obtaining a first test result that the electromagnetic interference source is unqualified to satisfy a magnetic card reading device's requirement for electromagnetic interference; otherwise, obtaining a second test result that the electromagnetic interference source is qualified to satisfy the magnetic card reading device's requirement for electromagnetic interference whereby security of the magnetic card reading device can be enhanced and the mag
    Type: Grant
    Filed: May 8, 2017
    Date of Patent: May 12, 2020
    Assignees: GRG BANKING EQUIPMENT CO., LTD., GRG BANKING IT CO., LTD.
    Inventors: Lixian Shangguan, Wenchuan Gong, Xiaofeng Jin
  • Patent number: 10393785
    Abstract: An optical sensing device applicable to two dimensional electric field, includes sequentially connected input polarization maintaining fibers, a sensing unit, an output single mode fiber, a photodetector and a signal processing unit, the sensing unit includes a lithium niobate substrate; a first Y optical waveguide and two Mach Zehnder structure optical waveguides are arranged on the lithium niobate substrate; the input of the first Y optical waveguide is connected with the output of the laser source, the output is respectively connected to the inputs of the two Mach Zehnder structure optical waveguides; the outputs of the two Mach Zehnder structure optical waveguides are connected to the photodetector; dipole antenna is arranged at any single waveguide arm of each Mach Zehnder structure optical waveguide, the polarization directions of the two dipole antennas are in orthogonality with each other.
    Type: Grant
    Filed: January 22, 2016
    Date of Patent: August 27, 2019
    Assignee: ZHEJIANG UNIVERSITY
    Inventors: Kang Xiao, Xiaofeng Jin, Xianmin Zhang, Hao Chi, Shilie Zheng
  • Patent number: 10388099
    Abstract: Provided are a device and method for identifying a paper currency fold. The device includes: a transparent protective body, configured to maintain components in the device to be clean; a laser source, configured to emit laser light a rectangular grating, configured to modulate the laser light into stripes which changes to be bright or dark according to a certain rule on a surface of a paper currency; an area array photoelectric sensor, configured to capture an image; an imaging lens group, configured to converge an image of the surface of the paper currency onto the area array photoelectric sensor; and an information processing module electrically connected with the area array photoelectric sensor, configured to process an image signal captured by the area array photoelectric sensor.
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: August 20, 2019
    Assignee: GRG BANKING EQUIPMENT CO., LTD.
    Inventors: Panfeng Luo, Tiancai Liang, Xiaofeng Jin, Yong Zhang
  • Publication number: 20190233405
    Abstract: The present invention discloses a phenylate derivative, a preparation method therefor, and a pharmaceutical composition and uses thereof. Specifically, the invention relates to phenylate derivatives represented by formula (I), a pharmaceutically-acceptable salt thereof, a stereoisomer thereof, a preparation method therefor, a pharmaceutical composition containing the one or more compounds, and uses of the compounds in treating diseases related to PD-1/PD-L1 signal channels, such as cancers, infectious diseases and autoimmune diseases.
    Type: Application
    Filed: May 23, 2017
    Publication date: August 1, 2019
    Inventors: Zhiqiang Feng, Xiaoguang Chen, Yang Yang, Chuan Zhou, Fangfang Lai, Ming Ji, Xiaofeng Jin, Nina Xue, Yi Zheng, Hao Chen, Ling Li
  • Publication number: 20190122011
    Abstract: The present invention provides a method and an apparatus for detecting anti-skimming magnetic interference, wherein the method comprises the steps of: S1: generating an original magnetic strip signal; acquiring an interfered magnetic strip signal by combining the original magnetic strip signal and an interference signal of an electromagnetic interference source to be tested; S2: decoding the interfered magnetic strip signal to obtain a decoded parameter; and S3: determining whether an original magnetic strip parameter is consistent with the decoded parameter; if so, obtaining a first test result that the electromagnetic interference source is unqualified to satisfy a magnetic card reading device's requirement for electromagnetic interference; otherwise, obtaining a second test result that the electromagnetic interference source is qualified to satisfy the magnetic card reading device's requirement for electromagnetic interference whereby security of the magnetic card reading device can be enhanced and the mag
    Type: Application
    Filed: May 8, 2017
    Publication date: April 25, 2019
    Inventors: Lixian Shangguan, Wenchuan Gong, Xiaofeng Jin
  • Patent number: 10121302
    Abstract: A note image acquiring system includes: a fiber laser, a fiber beam splitter, a fiber collimator, a laser beam expander, a lithium niobate intensity modulator array, a waveform generator, a signal amplifier, a polarization beam splitter, a quarter-wave plate, an imaging lens group, a line-array photosensitive chip, an image information processing module and an image combining module. The note image acquiring system can improve resolution of details of a note image without needing to increase the number of photosensitive chip units per unit length of a linear array image sensor.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: November 6, 2018
    Assignee: GRG Banking Equipment Co., Ltd.
    Inventors: Xiaofeng Jin, Tiancai Liang, Wenchuan Gong, Jianping Liu
  • Patent number: 10113976
    Abstract: A method and device for non-contact detection of a thin medium (5) is disclosed. The device comprises a light source (1), an optical splitter (2), a reference plane (3), a linearly arrayed photoelectric detector (6), a signal processing module (4) and the thin medium (5).
    Type: Grant
    Filed: July 8, 2015
    Date of Patent: October 30, 2018
    Assignee: GRG BANKING EQUIPMENT CO., LTD.
    Inventors: Xiaofeng Jin, Jianping Liu, Tiancai Liang, Wenchuan Gong
  • Publication number: 20180284174
    Abstract: An optical sensing device applicable to two dimensional electric field, includes sequentially connected input polarization maintaining fibers, a sensing unit, an output single mode fiber, a photodetector and a signal processing unit, the sensing unit includes a lithium niobate substrate; a first Y optical waveguide and two Mach Zehnder structure optical waveguides are arranged on the lithium niobate substrate; the input of the first Y optical waveguide is connected with the output of the laser source, the output is respectively connected to the inputs of the two Mach Zehnder structure optical waveguides; the outputs of the two Mach Zehnder structure optical waveguides are connected to the photodetector; dipole antenna is arranged at any single waveguide arm of each Mach Zehnder structure optical waveguide, the polarization directions of the two dipole antennas are in orthogonality with each other.
    Type: Application
    Filed: January 22, 2016
    Publication date: October 4, 2018
    Inventors: KANG XIAO, XIAOFENG JIN, XIANMIN ZHANG, HAO CHI, SHILIE ZHENG
  • Publication number: 20180174390
    Abstract: A note image acquiring system includes: a fiber laser, a fiber beam splitter, a fiber collimator, a laser beam expander, a lithium niobate intensity modulator array, a waveform generator, a signal amplifier, a polarization beam splitter, a quarter-wave plate, an imaging lens group, a line-array photosensitive chip, an image information processing module and an image combining module. The note image acquiring system can improve resolution of details of a note image without needing to increase the number of photosensitive chip units per unit length of a linear array image sensor.
    Type: Application
    Filed: March 25, 2016
    Publication date: June 21, 2018
    Applicant: GRG Banking Equipment Co., Ltd.
    Inventors: Xiaofeng Jin, Tiancai Liang, Wenchuan Gong, Jianping Liu
  • Publication number: 20180137877
    Abstract: A noise suppressing method, a noise suppressing device and a noise suppressing system are provided. The noise suppressing method includes: receiving internal noise acquired by a reference voice acquisition mechanism and a voice signal containing external noise acquired by a primary voice acquisition mechanism, when the voice signal is inputted; extracting an internal signal feature corresponding to the internal noise, where the internal signal feature is a power spectrum frame sequence; acquiring an external approximate feature corresponding to the external noise based on the internal signal feature and a pre-set mapping formula; converting the external approximate feature into a noise signal estimate by the inverse Fourier transform; and performing a pre-set noise cancellation process on the noise signal estimate and the acquired voice signal containing the internal noise, to obtain a noise-suppressed de-noised voice signal.
    Type: Application
    Filed: May 24, 2016
    Publication date: May 17, 2018
    Applicant: GRG Banking Equipment Co., Ltd.
    Inventors: Gaofeng Du, Tiancai Liang, Jianping Liu, Xiaofeng Jin
  • Publication number: 20170316632
    Abstract: Provided are a device and method for identifying a paper currency fold. The device includes: a transparent protective body, configured to maintain components in the device to be clean; a laser source, configured to emit laser light a rectangular grating, configured to modulate the laser light into stripes which changes to be bright or dark according to a certain rule on a surface of a paper currency; an area array photoelectric sensor, configured to capture an image; an imaging lens group, configured to converge an image of the surface of the paper currency onto the area array photoelectric sensor; and an information processing module electrically connected with the area array photoelectric sensor, configured to process an image signal captured by the area array photoelectric sensor.
    Type: Application
    Filed: August 20, 2015
    Publication date: November 2, 2017
    Applicant: GRG BANKING EQUIPMENT CO., LTD.
    Inventors: Panfeng LUO, Tiancai LIANG, Xiaofeng JIN, Yong ZHANG