Patents by Inventor David G Fischer

David G Fischer 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).

  • Multi-parameter scattering sensor and methods
    Patent number: 9377481
    Abstract: Methods, detectors and systems detect particles and/or measure particle properties.
    Type: Grant
    Filed: June 16, 2011
    Date of Patent: June 28, 2016
    Assignee: The United States of America as Represented by the Administrator of National Aeronautics and Space Administration
    Inventors: Paul S Greenberg, David G Fischer
  • Interference-free optical detection for Raman spectroscopy
    Patent number: 8310671
    Abstract: An architecture for spontaneous Raman scattering (SRS) that utilizes a frame-transfer charge-coupled device (CCD) sensor operating in a subframe burst gating mode to realize time-resolved combustion diagnostics is disclosed. The technique permits all-electronic optical gating with microsecond shutter speeds (<5 ?s), without compromising optical throughput or image fidelity. When used in conjunction with a pair of orthogonally-polarized excitation lasers, the technique measures time-resolved vibrational Raman scattering that is minimally contaminated by problematic optical background noise.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: November 13, 2012
    Assignee: The United States of America as Represented by the Administrator of National Aeronautics and Space Administration
    Inventors: Quang-Viet Nguyen, David G Fischer, Jun Kojima