Patents by Inventor Robert Earl Pulfrey

Robert Earl Pulfrey 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).

  • Optical dual Fabry-Perot interferometric strain/temperature sensor, and system for separate reading thereof
    Patent number: 5907403
    Abstract: A strain sensor has a first optical fiber (212) including first (212e.sub.1) and second (212e.sub.2) ends and also includes lead-in (12) and lead-out (16) optical fibers. One (12) of the lead-in and the lead-out fiber has a first end (12e) affixed to the first end of the first fiber, forming a first partially reflective surface (214). The other one (16) of the lead-in and lead-out fibers has a first end (16e) located at a second distance (S) from the second end (212e.sub.2) of the first fiber (212). The sensor includes a glass tube (30), with a bore (32), affixed to at least the other one of the fibers, and holds the first end of the other one of the fibers to define coaxial partial reflectors (14, 18) at the second end (212e.sub.2) of the first fiber and the first end (16e) of the other one of the fibers. In one embodiment, the one of the fibers is the lead-in fiber.
    Type: Grant
    Filed: April 24, 1996
    Date of Patent: May 25, 1999
    Assignee: Lockheed Martin Corp.
    Inventors: Jeffrey Pratt Andrews, Robert Earl Pulfrey