Patents by Inventor Letchuman Sripragash

Letchuman Sripragash 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).

  • Normalized defect characterization of pulse thermographic nondestructive evaluation
    Patent number: 10546207
    Abstract: A method of thermographic nondestructive evaluation may include heating a portion of a surface of an object from a first surface temperature to a second surface temperature that is greater than the first surface temperature, collecting a plurality of thermal images of the portion of the surface of the object, detecting the sound zone of the portion of the surface of the object, determining a characteristic time corresponding to a time after the heating of the portion of the surface of the object wherein the sound zone of the surface of the object approaches a steady state temperature, normalizing temperature data of the plurality of thermal images with respect to the characteristic time and the steady state temperature, and detecting the defect zone based on differences between normalized temperature data of pixels of the defect zone and normalized temperature data of pixels of the sound.
    Type: Grant
    Filed: April 10, 2017
    Date of Patent: January 28, 2020
    Assignee: North Carolina Agricultural and Technical State University
    Inventors: Mannur J. Sundaresan, Letchuman Sripragash
  • Normalized Defect Characterization of Pulse Thermographic Nondestructive Evaluation
    Publication number: 20170294013
    Abstract: A method of thermographic nondestructive evaluation may include heating a portion of a surface of an object from a first surface temperature to a second surface temperature that is greater than the first surface temperature, collecting a plurality of thermal images of the portion of the surface of the object, detecting the sound zone of the portion of the surface of the object, determining a characteristic time corresponding to a time after the heating of the portion of the surface of the object wherein the sound zone of the surface of the object approaches a steady state temperature, normalizing temperature data of the plurality of thermal images with respect to the characteristic time and the steady state temperature, and detecting the defect zone based on differences between normalized temperature data of pixels of the defect zone and normalized temperature data of pixels of the sound.
    Type: Application
    Filed: April 10, 2017
    Publication date: October 12, 2017
    Inventors: Mannur J. Sundaresan, Letchuman Sripragash