Patents by Inventor David C. Calvo

David C. Calvo 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).

  • Patent number: 9922638
    Abstract: An apparatus in a surrounding liquid and methods of using same. The apparatus includes an acoustic Fresnel zone plate comprising a compliant frame, a substrate connected to the frame, and an acoustic diffraction grating connected to the substrate. The acoustic diffraction grating includes a plurality of concentric rings or a plurality of concentric islands. The substrate is acoustic-impedance-mismatched with the acoustic diffraction grating. The acoustic Fresnel zone plate includes at least one acoustic focal spot. The substrate is acoustic-impedance-mismatched with the surrounding liquid and the acoustic diffraction grating is acoustic-impedance-matched with the surrounding liquid, or the substrate is acoustic-impedance-matched with the surrounding liquid and the acoustic diffraction grating is acoustic-impedance-mismatched with the surrounding liquid.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: March 20, 2018
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: David C. Calvo, Abel L. Thangawng
  • Patent number: 8578759
    Abstract: A method and an apparatus for intrusion detection. The apparatus includes an acoustic source, a laser light source, a pressure-sensitive optical fiber including a first end and a second end. The second end is connected to the laser light source and oriented toward the acoustic source. The laser light source generates a laser pulse traveling through the pressure-sensitive optical fiber toward the acoustic source. The laser pulse includes a time-of-flight. The acoustic source generates an acoustic wave. The acoustic wave includes a plurality of evanescent wave fronts. The plurality of evanescent wave fronts, upon scattering from a non-uniform material region, radially contracts the pressure-sensitive optical fiber to alter the time-of-flight of the laser pulse along the pressure-sensitive optical fiber by increasing the fiber length.
    Type: Grant
    Filed: November 7, 2011
    Date of Patent: November 12, 2013
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: David C. Calvo, Jill P. Bingham, Michael Nicholas
  • Publication number: 20120180552
    Abstract: A method and an apparatus for intrusion detection. The apparatus includes an acoustic source, a laser light source, a pressure-sensitive optical fiber including a first end and a second end. The second end is connected to the laser light source and oriented toward the acoustic source. The laser light source generates a laser pulse traveling through the pressure-sensitive optical fiber toward the acoustic source. The laser pulse includes a time-of-flight. The acoustic source generates an acoustic wave. The acoustic wave includes a plurality of evanescent wave fronts. The plurality of evanescent wave fronts, upon scattering from a non-uniform material region, radially contracts the pressure-sensitive optical fiber to alter the time-of-flight of the laser pulse along the pressure-sensitive optical fiber by increasing the fiber length.
    Type: Application
    Filed: November 7, 2011
    Publication date: July 19, 2012
    Inventors: David C. Calvo, Jill P. Bingham, Michael Nicholas