Patents by Inventor Chenjia Gao

Chenjia Gao 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).

  • Method for full-field measurement using dynamic laser doppler imaging
    Patent number: 11561081
    Abstract: A method for full-field measurement using Doppler imaging, comprising the following steps: turning on a laser and adjusting the laser; adjusting a spatial filter to obtain circular laser spots having uniform intensity distribution; adjusting a quarter-wave plate and a whole polarizer in a system, and requiring two beams in a reference object and a measured object having different frequencies and perpendicular polarization directions; applying slight pressure to the measured object, setting a charge coupled device (CCD) camera into a continuous acquisition mode, observing interference fringes, and adjusting a light path so that the fringes are clear and visible; setting the sampling frequency, sampling time, captured image format and resolution size of the CCD camera; turning on a lithium niobate crystal drive power switch to produce a heterodyne carrier frequency; applying continuous equal pushing force to the measured object by means of piezoelectric ceramics (PZT) so as to make the measured object produce c
    Type: Grant
    Filed: November 13, 2020
    Date of Patent: January 24, 2023
    Assignee: Beijing Jiaotong University
    Inventors: Zhan Gao, Jie Qin, Qibo Feng, Shengjia Wang, Xu Wang, Shanwei Yang, Chenjia Gao
  • METHOD FOR FULL-FIELD MEASUREMENT USING DYNAMIC LASER DOPPLER IMAGING
    Publication number: 20210063137
    Abstract: A method for full-field measurement using Doppler imaging, comprising the following steps: turning on a laser and adjusting the laser; adjusting a spatial filter to obtain circular laser spots having uniform intensity distribution; adjusting a quarter-wave plate and a whole polarizer in a system, and requiring two beams in a reference object and a measured object having different frequencies and perpendicular polarization directions; applying slight pressure to the measured object, setting a charge coupled device (CCD) camera into a continuous acquisition mode, observing interference fringes, and adjusting a light path so that the fringes are clear and visible; setting the sampling frequency, sampling time, captured image format and resolution size of the CCD camera; turning on a lithium niobate crystal drive power switch to produce a heterodyne carrier frequency; applying continuous equal pushing force to the measured object by means of piezoelectric ceramics (PZT) so as to make the measured object produce c
    Type: Application
    Filed: November 13, 2020
    Publication date: March 4, 2021
    Inventors: Zhan Gao, Jie Qin, Qibo Feng, Shengjia Wang, Xu Wang, Shanwei Yang, Chenjia Gao
  • Method for full-field measurement using dynamic laser doppler imaging
    Patent number: 10883817
    Abstract: A method for full-field measurement using Doppler imaging, comprising the following steps: turning on a laser and adjusting the laser; adjusting a spatial filter to obtain circular laser spots having uniform intensity distribution; adjusting a quarter-wave plate and a whole polarizer in a system, and requiring two beams in a reference object and a measured object having different frequencies and perpendicular polarization directions; applying slight pressure to the measured object, setting a charge coupled device (CCD) camera into a continuous acquisition mode, observing interference fringes, and adjusting a light path so that the fringes are clear and visible; setting the sampling frequency, sampling time, captured image format and resolution size of the CCD camera; turning on a lithium niobate crystal drive power switch to produce a heterodyne carrier frequency; applying continuous equal pushing force to the measured object by means of piezoelectric ceramics (PZT) so as to make the measured object produce c
    Type: Grant
    Filed: October 19, 2016
    Date of Patent: January 5, 2021
    Assignee: Beijing Jiaotong University
    Inventors: Zhan Gao, Jie Qin, Qibo Feng, Shengjia Wang, Xu Wang, Shanwei Yang, Chenjia Gao
  • METHOD FOR FULL-FIELD MEASUREMENT USING DYNAMIC LASER DOPPLER IMAGING
    Publication number: 20200182603
    Abstract: A method for full-field measurement using Doppler imaging, comprising the following steps: turning on a laser and adjusting the laser; adjusting a spatial filter to obtain circular laser spots having uniform intensity distribution; adjusting a quarter-wave plate and a whole polarizer in a system, and requiring two beams in a reference object and a measured object having different frequencies and perpendicular polarization directions; applying slight pressure to the measured object, setting a charge coupled device (CCD) camera into a continuous acquisition mode, observing interference fringes, and adjusting a light path so that the fringes are clear and visible; setting the sampling frequency, sampling time, captured image format and resolution size of the CCD camera; turning on a lithium niobate crystal drive power switch to produce a heterodyne carrier frequency; applying continuous equal pushing force to the measured object by means of piezoelectric ceramics (PZT) so as to make the measured object produce c
    Type: Application
    Filed: October 19, 2016
    Publication date: June 11, 2020
    Inventors: Zhan GAO, Jie Qin, Qibo Feng, Shengjia Wang, Xu Wang, Shanwe Yang, Chenjia Gao