Patents Represented by Attorney Frederick G. Michaud

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  • Fizeau fringe light evaluator and method
    Patent number: 4222667
    Abstract: A beam of light to be evaluated for coherence length is projected through an optical cavity having non-parallel reflecting surfaces to form a Fizeau fringe pattern. A multiple detector array senses the light output of the cavity at various locations along the fringe pattern. The sensed values of the light are compared with one another and the polarity of their difference is used to determine whether the coherence length of the light beam is above a predetermined threshold value.
    Type: Grant
    Filed: August 24, 1977
    Date of Patent: September 16, 1980
    Assignee: Martin Marietta Corporation
    Inventor: Charles R. Layne