Patents by Inventor Donna Washington STOKES

Donna Washington STOKES 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).

  • Systems and methods for quality control of a periodic structure
    Patent number: 10241058
    Abstract: Quality control of a periodic structure is performed using the damping rate of acoustic waves generated in the periodic structure. In this technique, an excitation light beam illuminates the first layer in the periodic structure to excite an acoustic wave. Possible irregularities in the periodic structure can scatter the acoustic wave, thereby increasing the damping rate of the acoustic wave. A sequence of probe light beams illuminates the periodic structure to measure the acoustic wave as a function of time to generated a temporal signal representing the damping rate of the acoustic signal. The acquired damping rate is employed to evaluate the quality of the periodic structure.
    Type: Grant
    Filed: July 5, 2017
    Date of Patent: March 26, 2019
    Assignee: Massachusetts Institute of Technology
    Inventors: Alexei Maznev, Keith A. Nelson, Abdelhak Bensaoula, Jateen S. Gandhi, Donna Washington Stokes, Rebecca Lynne Forrest, Hyun Doug Shin
  • Systems and Methods for Quality Control of a Periodic Structure
    Publication number: 20180011031
    Abstract: Quality control of a periodic structure is performed using the damping rate of acoustic waves generated in the periodic structure. In this technique, an excitation light beam illuminates the first layer in the periodic structure to excite an acoustic wave. Possible irregularities in the periodic structure can scatter the acoustic wave, thereby increasing the damping rate of the acoustic wave. A sequence of probe light beams illuminates the periodic structure to measure the acoustic wave as a function of time to generated a temporal signal representing the damping rate of the acoustic signal. The acquired damping rate is employed to evaluate the quality of the periodic structure.
    Type: Application
    Filed: July 5, 2017
    Publication date: January 11, 2018
    Inventors: Alexei Maznev, Keith A. NELSON, Abdelhak BENSAOULA, Jateen S. GANDHI, Donna Washington STOKES, Rebecca Lynne FORREST, Hyun Doug SHIN