Patents by Inventor Walter L. Hales

Walter L. Hales 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).

  • Nonintrusive electro-optic field sensor
    Patent number: 5041779
    Abstract: Utilizing the property of electro-optic crystal which changes its index of refraction in the presence of electric field, such a crystal is placed inside the resonant cavity of a Fabry-Perot type interferometer. Laser light travelling through the cavity and the crystal experiences modified optical path length in the presence of electric field. The fringe pattern at the focal plane is observed and used to detect and measure the ambient electric field.
    Type: Grant
    Filed: August 17, 1990
    Date of Patent: August 20, 1991
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Walter L. Hales
  • Lateral-shearing electro-optic field sensor
    Patent number: 4953981
    Abstract: A lateral-shearing electro-optic field sensor in which a lateral-shearing terferometer is used in conjunction with an electro-optic crystal and a coherent light source to measure the waveform of an electro-magnetic pulse or a microwave pulse in free space. Depending on the size of the electro-optic crystal used, the device is adapted to measure frequencies as high as 20 GHz.
    Type: Grant
    Filed: August 3, 1989
    Date of Patent: September 4, 1990
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Walter L. Hales
  • Displacement and force measurement by means of optically-generated moire fringes
    Patent number: H212
    Abstract: Apparatus for measuring force and displacement by measuring Moire fringe fts in response to relative movement between a pair of mirrors which reflect light beams therefrom to an interaction region. A pair of electro-optical sensors is positioned to view the interference region and detect fringe shifts responsive to relative movement between the mirrors.
    Type: Grant
    Filed: December 27, 1984
    Date of Patent: February 3, 1987
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: James D. Holder, Walter L. Hales