Patents by Inventor Nathan Joseph Greenfield

Nathan Joseph Greenfield 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).

  • FMCW LiDAR methods and apparatuses including examples having feedback loops
    Patent number: 11422258
    Abstract: Methods and apparatuses are described for frequency-modulated continuous-wave (FMCW) light detection and ranging (LiDAR). Examples are provided where high-closed-loop bandwidth, active feedback applied to laser frequency chirps may provide increases in the free-running laser coherence length for long-range FMCW distance measurements. Examples are provided that use an asymmetric sideband generator within an active feedback loop for higher closed-loop bandwidth. Examples of using a single shared reference interferometer within multiple active feedback loops that may be used for increasing the coherence length of multiple chirped lasers are described. Example calibrators are also described.
    Type: Grant
    Filed: March 16, 2018
    Date of Patent: August 23, 2022
    Assignee: Bridger Photonics, Inc.
    Inventors: Michael James Thorpe, Jason Kenneth Brasseur, Peter Aaron Roos, Nathan Joseph Greenfield, Aaron Thomas Kreitinger
  • FMCW LIDAR METHODS AND APPARATUSES INCLUDING EXAMPLES HAVING FEEDBACK LOOPS
    Publication number: 20200011994
    Abstract: Methods and apparatuses are described for frequency-modulated continuous-wave (FMCW) light detection and ranging (LiDAR). Examples are provided where high-closed-loop bandwidth, active feedback applied to laser frequency chirps may provide increases in the free-running laser coherence length for long-range FMCW distance measurements. Examples are provided that use an asymmetric sideband generator within an active feedback loop for higher closed-loop bandwidth. Examples of using a single shared reference interferometer within multiple active feedback loops that may be used for increasing the coherence length of multiple chirped lasers are described. Example calibrators are also described.
    Type: Application
    Filed: March 16, 2018
    Publication date: January 9, 2020
    Applicant: Bridger Photonics, Inc.
    Inventors: Michael James Thorpe, Jason Kenneth Brasseur, Peter Aaron Roos, Nathan Joseph Greenfield, Aaron Thomas Kreitinger