Patents by Inventor Veronique H. M. P. Prejean-Lefevre

Veronique H. M. P. Prejean-Lefevre 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).

  • Procedure for measuring the dimensions of the optical focus of an X-ray tube
    Patent number: 5606591
    Abstract: A method of measuring the dimensions of the optical focus of an X-ray tube is described which consists of producing an X-ray image of the optical focus on a fine-grained X-ray-sensitive film, illuminating the radiogram obtained by means of a lamp emitting homogeneous radiation and taking a video image of the radiogram by means of a video camera, processing the video image so as to obtain a digitized image of the optical focus, and measuring the dimensions of the optical focus from the digitized image obtained.
    Type: Grant
    Filed: December 15, 1995
    Date of Patent: February 25, 1997
    Assignee: Societe Nationale d'Etude et de Construction de Moteurs d'Aviation
    Inventors: Etienne C. Montel, Veronique H. M. P. Prejean-Lefevre
  • Process and apparatus for automatically characterizing, optimizing and checking a crack detection analysis method
    Patent number: 5570431
    Abstract: Quantitative characterization of a crack detection analysis method is achieved by determining the detection sensitivity and background noise produced by the analysis method by suitably processing images obtained from one or more control specimens prepared by the method and subjected to appropriate and optimized conditions of illumination. In addition, the crack detection analysis method is optimized by looking for the parameters which influence the method and determining the value thereof which maximizes detection sensitivity and minimizes background noise.
    Type: Grant
    Filed: October 20, 1994
    Date of Patent: October 29, 1996
    Assignee: Societe Nationale d'Etude et de Construction de Moteurs d'Aviation "Snecma"
    Inventors: Herve, P. R. Gillard, Veronique H. M. P. Prejean-Lefevre
  • Process and apparatus for automatically characterising, optimising and checking a crack detection analysis method
    Patent number: 5563417
    Abstract: An apparatus for characterizing an analysis method based on fluorescent crack detection. The surface defects in articles to be checked are revealed by using a visible radiation around an excitation wavelength. The apparatus includes an illumination device, a camera and an image processor. The illumination device includes an ultraviolet light source, a monochromator and a light guide to focus the ultraviolet radiation.
    Type: Grant
    Filed: September 6, 1995
    Date of Patent: October 8, 1996
    Assignee: Societe Nationale d'Etude et de Construction de Moteurs d'Aviation "SNECMA"
    Inventors: Herve P. R. Gillard, Veronique H. M. P. Prejean Lefevre
  • Process and apparatus for the acquisition and processing of screen images
    Patent number: 5351307
    Abstract: The present invention relates to a process for the acquisition and processing of screen images or radiographs and to an apparatus making it possible to inspect or control mechanical parts. The process consists of obtaining at least two screen images of the part to be inspected, converting said images into digital video images coded on several grey levels, correcting each image with respect to itself and then with respect to a reference image and finally binarizing the corrected images in order to superimpose them, so as to determine the image points which correspond and thus detect defects. Application to the control and inspection of mechanical parts.
    Type: Grant
    Filed: October 28, 1992
    Date of Patent: September 27, 1994
    Assignee: Societe Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A."
    Inventor: Veronique H. M. P. Prejean-Lefevre