Patents by Inventor Peter Dmitrievich Krotenko

Peter Dmitrievich Krotenko 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).

  • Patent number: 6628399
    Abstract: This invention relates to a method and device for non-destructive testing of details, machine units and mechanisms, various materials, and in particular, to a method and device for non-destructive determination of residual stresses which are based on the optical holographic interferometry technique. First, a hologram of the investigation area of the object in its initial state is registered. Then the release of the residual stresses in an investigation point in the investigation area is performed by exposing the surface of the object to a high-current electric pulse with rectangular shape. Finally, an interferogram of the exact same area of the object is made, and the residual stresses at the investigation area are determined from the shape and size of the fringes in the interferogram.
    Type: Grant
    Filed: June 5, 2000
    Date of Patent: September 30, 2003
    Assignee: HoloTech a.s.
    Inventors: John Petter Fjeldstad, Irina Evgenievna Fjeldstad, Leonid Mikhailovich Lobanov, Vjacheslav Avtonomovich Pivtorak, Nikolay Georgievich Kuvshinsky, Sergey Gavrilovich Andrushchenko, Vladimir Petrovich Kushniruk, Valeriy Aleksandrovich Pavlov, Vladimir Petrovich Loginov, Peter Dmitrievich Krotenko
  • Patent number: 6522409
    Abstract: This invention relates to a method and device for non-destructive inspection by means of holographic interferometry of details, machine units, mechanisms, and various materials, which eliminates the problem of relative displacement of the object with regard to the holographic equipment, especially due to vibratory motion of the object. This is achieved by transporting the reference and object beams between the investigated object, light source, and interferometer in flexible wave guidance cables and that the endpoints of the flexible wave guidance cables are securely attached in a fixed distance from the investigated object, recording medium of the interferometer and light source, respectively. This will also give the benefit of dividing the holographic interferometer into an object part and a registering part which forms the interferograms.
    Type: Grant
    Filed: June 13, 2000
    Date of Patent: February 18, 2003
    Assignee: HoloTech as
    Inventors: John Petter Fjeldstad, Irina Evgenievna Fjeldstad, Leonid Mikhailovich Lobanov, Vjacheslav Avtonomovich Pivtorak, Nikolay Georgievich Kuvshinsky, Galina Ivanovna Tkachuk, Vladimir Petrovich Kushniruk, Valeriy Aleksandrovich Pavlov, Nikolay Aleksandrovich Davidenko, Peter Dmitrievich Krotenko