Patents by Inventor Glenn Beheim

Glenn Beheim 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).

  • Phase-stepping fiber-optic projected fringe system for surface topography measurements
    Patent number: 5146293
    Abstract: A projected fringe interferometer for measuring the topography of an object periodically steps the phase angle between a pair of light beams emanating from a common source. The steps are .pi./2 radians (90.degree.) apart and at each step a video image of the fringes is recorded and stored. Photodetectors measure either the phase angle .theta. of the beams or 2.theta. either of which is used to control one of the light beams so the 90.degree. .theta. is accurately maintained. A camera, a computer, a phase controller and a phase modulator established closed-loop control of .theta.. Measuring the phase map of a flat surface establishes a calibration reference.
    Type: Grant
    Filed: May 13, 1991
    Date of Patent: September 8, 1992
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Carolyn R. Mercer, Glenn Beheim