Patents by Inventor Stephen T. Welstead

Stephen T. Welstead 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).

  • Extended dynamic range one dimensional spatial light modulator
    Patent number: 5039210
    Abstract: An optical information system which uses a liquid crystal television (LCTV) as a one dimensional spatial light modulator (SLM) is presented. An optical carrier wave is generated by polarizing and collimating the output of a laser. The liquid crystal television modulates the optical carrier wave with a digital modulating signal to output thereby a modulated optical signal: An array of photodetectors electroptically connects the modulated optical signal into a modulated electrical signal which is displayed on an oscilloscope. The use of an LCTV as a one dimensional SLM yields higher numerical accuracy and extended dynamic range than two dimensional SLM applications of the same equipment.
    Type: Grant
    Filed: July 2, 1990
    Date of Patent: August 13, 1991
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Stephen T. Welstead, Michael J. Ward