Patents by Inventor Jong Hann Chow

Jong Hann Chow 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: 20240223421
    Abstract: Systems and methods/processes for optical interferometric sensing using digitally enhanced interferometry (DI).
    Type: Application
    Filed: August 30, 2022
    Publication date: July 4, 2024
    Inventors: Anneshwa Dey, Chathura Priyankara Bandutunga, Ya Zhang, Malcolm Bruce Gray, Jong Hann Chow, Justin Chak Tin Wong, Paul George Sibley
  • Publication number: 20240133822
    Abstract: A method and system for determining a location of artefacts and/or inclusions in a gemstone, mineral or sample thereof, the method comprising: surface mapping a gemstone, mineral or sample thereof to determine surface geometry associated with at least a portion of a surface of the gemstone, mineral or sample thereof; sub-surface mapping the gemstone, mineral or sample thereof using an optical beam that is directed at the surface along an optical beam path, wherein the optical beam is generated by an optical source using an optical tomography process; determining a surface normal at the surface at an intersection point between the optical beam path and the determined surface geometry; determining relative positioning between the surface normal and the optical beam path; and determining the location of artefacts and/or inclusions in the gemstone, mineral or sample thereof based on the sub-surface mapping step and the determined relative positioning.
    Type: Application
    Filed: January 2, 2024
    Publication date: April 25, 2024
    Applicant: The Australian National University
    Inventors: Roland Fleddermann, Jong Hann Chow, Adrian Paul Sheppard, Timothy John Senden, Shane Jamie Latham, Keshu Huang
  • Patent number: 11898962
    Abstract: A method and system for determining a location of artefacts and/or inclusions in a gemstone, mineral or sample thereof, the method comprising the steps of: surface mapping a gemstone, mineral or sample thereof to determine surface geometry associated with at least a portion of a surface of the gemstone, mineral or sample thereof; sub-surface mapping the gemstone, mineral or sample thereof using an optical beam that is directed at the surface along an optical beam path, wherein the optical beam is generated by an optical source using an optical tomography process; determining a surface normal at the surface at an intersection point between the optical beam path and the determined surface geometry; determining relative positioning between the surface normal and the optical beam path; and determining the location of artefacts and/or inclusions in the gemstone, mineral or sample thereof based on the sub-surface mapping step and the determined relative positioning.
    Type: Grant
    Filed: March 4, 2019
    Date of Patent: February 13, 2024
    Assignee: The Australian National University
    Inventors: Roland Fleddermann, Jong Hann Chow, Adrian Paul Sheppard, Timothy John Senden, Shane Jamie Latham, Keshu Huang
  • Publication number: 20230314140
    Abstract: A system for fibre-optic Sagnac interferometry, the system comprising: an optical source; an optical splitter configured to split light from the optical source into a first optical beam and a second optical beam; an optical circuit comprising a first modulation unit, a second modulation unit, and an optical fibre operatively coupled between the first and second modulation units, wherein the optical circuit is operatively coupled to the optical splitter such that the first and second optical beams traverse the optical circuit in opposite directions, the first optical beam being modulated by the first modulation unit before being modulated by the second modulation unit, and the second optical beam being modulated by the second modulation unit before being modulated by the first modulation unit, wherein the first modulation unit is configured to modulate light passing through it with a first modulation code, and the second modulation unit is configured to modulate light passing through it with a second modulatio
    Type: Application
    Filed: August 19, 2021
    Publication date: October 5, 2023
    Inventors: Chathura Priyankara Bandutunga, Acton Chak Tin Wong, Jong Hann Chow, Malcolm Hann Chow
  • Publication number: 20210041369
    Abstract: A method and system for determining a location of artefacts and/or inclusions in a gemstone, mineral or sample thereof, the method comprising the steps of: surface mapping a gemstone, mineral or sample thereof to determine surface geometry associated with at least a portion of a surface of the gemstone, mineral or sample thereof; sub-surface mapping the gemstone, mineral or sample thereof using an optical beam that is directed at the surface along an optical beam path, wherein the optical beam is generated by an optical source using an optical tomography process; determining a surface normal at the surface at an intersection point between the optical beam path and the determined surface geometry; determining relative positioning between the surface normal and the optical beam path; and determining the location of artefacts and/or inclusions in the gemstone, mineral or sample thereof based on the sub-surface mapping step and the determined relative positioning.
    Type: Application
    Filed: March 4, 2019
    Publication date: February 11, 2021
    Applicant: The Australian National University
    Inventors: Roland Fleddermann, Jong Hann Chow, Adrian Paul Sheppard, Timothy John Senden, Shane Jamie Latham, Keshu Huang
  • Patent number: 8472022
    Abstract: A system and method for spectroscopic detection of loss in a resonator cavity is disclosed. The system can include a number of components. A tunable laser source can generate a laser beam. A frequency locking system can lock the frequency of the laser beam to a resonance of the resonator cavity or lock the length of the cavity to the frequency of the laser beam. The first modulation element can modulate the laser beam at a first modulation frequency to generate a modulated laser beam. The input coupler can direct the modulated laser beam into the resonator cavity. The first directing element can direct a first portion of light reflected from the input coupler to a first photodetector. The first demodulator can demodulate the first modulation signal to generate a first error signal which is a function of the loss in the resonator cavity.
    Type: Grant
    Filed: December 5, 2008
    Date of Patent: June 25, 2013
    Assignee: The Australian National University
    Inventors: Jong Hann Chow, Malcolm Bruce Gray, Ian Charles Murray Littler, David Ernest McClelland
  • Publication number: 20100315642
    Abstract: A system and method for spectroscopic detection of a loss in a resonator cavity. The system comprises: a tunable laser source for generating a laser beam; a frequency locking system for either locking the frequency of the laser beam to a resonance of the resonator cavity or locking the length of the cavity to the frequency of the laser beam; a first modulation element for modulating the laser beam at a first modulation frequency to generate a modulated laser beam; an input coupler adapted for directing the modulated laser beam into the resonator cavity; a first directing element for directing a first portion of light reflected from the input coupler to a first photodetector to generate a first detected signal; and a first demodulator capable of demodulating the first modulation signal from the first detected signal to generate a first error signal which is a function of the loss in the resonator cavity.
    Type: Application
    Filed: December 5, 2008
    Publication date: December 16, 2010
    Inventors: Jong Hann Chow, Malcolm Bruce Gray, Ian Charles Murray Littler, David Ernest McClelland