Patents by Inventor Douglas M. Photiadis

Douglas M. Photiadis 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: 12110376
    Abstract: An article having: an elastomeric jacket; a gel within the jacket; and a plurality of gas-filled, polymerically-encapsulated microbubbles suspended in the gel. The microbubbles have a Gaussian particle size distribution. The largest microbubble has a diameter at least 10 times the diameter of the smallest microbubble. The article may exhibit Anderson localization at at least one frequency of sound waves impacting the article.
    Type: Grant
    Filed: January 25, 2022
    Date of Patent: October 8, 2024
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Bernard R. Matis, Nicholas T. Gangemi, Jeffrey W. Baldwin, Steven W. Liskey, Aaron D. Edmunds, William B. Wilson, Douglas M. Photiadis
  • Publication number: 20220251322
    Abstract: An article having: an elastomeric jacket; a gel within the jacket; and a plurality of gas-filled, polymerically-encapsulated microbubbles suspended in the gel. The microbubbles have a Gaussian particle size distribution. The largest microbubble has a diameter at least 10 times the diameter of the smallest microbubble. The article may exhibit Anderson localization at at least one frequency of sound waves impacting the article.
    Type: Application
    Filed: January 25, 2022
    Publication date: August 11, 2022
    Applicant: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Bernard R. Matis, Nicholas T. Gangemi, Jeffrey W. Baldwin, Steven W. Liskey, Aaron D. Edmunds, William B. Wilson, Douglas M. Photiadis
  • Patent number: 11408961
    Abstract: Systems and methods are provided for sensing acoustic signals using a floating base vector sensor. A vector sensor according to an embodiment of the present disclosure can be used to detect and characterize low frequency sound wave(s) in a viscous medium (e.g., air, water, etc.) by detecting a periodic motion of the media particles associated with the sound wave(s). The orientation of the particle velocity deduced from such measurements can provide information regarding the wave vector of the sound wave(s), can define the direction of arrival (DOA) for the acoustic signal, and can assist locating the source of the sound of interest.
    Type: Grant
    Filed: February 20, 2020
    Date of Patent: August 9, 2022
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Maxim K. Zalalutdinov, Douglas M. Photiadis, Joseph A. Bucaro, Brian H. Houston
  • Patent number: 11287508
    Abstract: Systems and methods are provided for sensing acoustic signals using a floating base vector sensor. A vector sensor according to an embodiment of the present disclosure can be used to detect and characterize low frequency sound wave(s) in a viscous medium (e.g., air, water, etc.) by detecting a periodic motion of the media particles associated with the sound wave(s). The orientation of the particle velocity deduced from such measurements can provide information regarding the wave vector of the sound wave(s), can define the direction of arrival (DOA) for the acoustic signal, and can assist locating the source of the sound of interest.
    Type: Grant
    Filed: May 3, 2018
    Date of Patent: March 29, 2022
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Maxim K. Zalalutdinov, Douglas M. Photiadis, Joseph A. Bucaro, Brian H. Houston
  • Publication number: 20200191900
    Abstract: Systems and methods are provided for sensing acoustic signals using a floating base vector sensor. A vector sensor according to an embodiment of the present disclosure can be used to detect and characterize low frequency sound wave(s) in a viscous medium (e.g., air, water, etc.) by detecting a periodic motion of the media particles associated with the sound wave(s). The orientation of the particle velocity deduced from such measurements can provide information regarding the wave vector of the sound wave(s), can define the direction of arrival (DOA) for the acoustic signal, and can assist locating the source of the sound of interest.
    Type: Application
    Filed: February 20, 2020
    Publication date: June 18, 2020
    Inventors: Maxim K. Zalalutdinov, Douglas M. Photiadis, Joseph A. Bucaro, Brian H. Houston
  • Publication number: 20190056473
    Abstract: Systems and methods are provided for sensing acoustic signals using a floating base vector sensor. A vector sensor according to an embodiment of the present disclosure can be used to detect and characterize low frequency sound wave(s) in a viscous medium (e.g., air, water, etc.) by detecting a periodic motion of the media particles associated with the sound wave(s). The orientation of the particle velocity deduced from such measurements can provide information regarding the wave vector of the sound wave(s), can define the direction of arrival (DOA) for the acoustic signal, and can assist locating the source of the sound of interest.
    Type: Application
    Filed: May 3, 2018
    Publication date: February 21, 2019
    Inventors: Maxim K. Zalalutdinov, Douglas M. Photiadis, Joseph A. Bucaro, Brian H. Houston
  • Patent number: 6650420
    Abstract: An apparatus for measuring the amount of motion of the surface of a microscopic object includes a light source, an optical fiber for transmitting the light, and a collection objective. The optical fiber emits the light output through an aperture tapered to a diameter in the range of from 20 nm to 200 nm. The collection objective is positioned to receive both the direct component of the fiber light output and the Doppler-shifted reflected light of the fiber light output from the surface of the object. The direct component and the Doppler-shifted reflected light combine in the collection objective to form an interfered light signal that is output to a photo-receiver. The intensity of the interfered light signal is modulated by the relative phase shift between the two interfering beams and is proportional to the out-of-plane displacement caused by the surface motion of the object surface.
    Type: Grant
    Filed: February 27, 2002
    Date of Patent: November 18, 2003
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Brian H. Houston, Douglas M. Photiadis, Joseph F. Vignola
  • Publication number: 20030160967
    Abstract: An apparatus for measuring the amount of motion of the surface of a microscopic object includes a light source, an optical fiber for transmitting the light, and a collection objective. The optical fiber emits the light output through an aperture tapered to a diameter in the range of from 20 nm to 200 nm. The collection objective is positioned to receive both the direct component of the fiber light output and the Doppler-shifted reflected light of the fiber light output from the surface of the object. The direct component and the Doppler-shifted reflected light combine in the collection objective to form an interfered light signal that is output to a photo-receiver. The intensity of the interfered light signal is modulated by the relative phase shift between the two interfering beams and is proportional to the out-of-plane displacement caused by the surface motion of the object surface.
    Type: Application
    Filed: February 27, 2002
    Publication date: August 28, 2003
    Inventors: Brian H. Houston, Douglas M. Photiadis, Joseph F. Vignola