Patents by Inventor John L. Stensby

John L. Stensby 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).

  • Modulated high sensitivity infrared polarimeter
    Patent number: 5210417
    Abstract: A modulated Faraday rotation signal is produced by passing a linearly polarized laser beam through a semiconductor wafer sample in a modulated magnetic field that is induced in an electromagnet by a sine wave generator and driver coupled thereto. The rotation signal is normalized by dividing by a transmission signal produced by modulating the beam with a chopper that operates at a different frequency from the frequency of the driver. The result is a Faraday rotation measurement with high signal-to-noise ratio and compensation for laser drift in intensity.
    Type: Grant
    Filed: February 24, 1992
    Date of Patent: May 11, 1993
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: John A. Grisham, Frederick W. Clarke, Charles R. Christensen, John L. Stensby