Patents by Inventor Rolf Engler

Rolf Engler 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).

  • Process and apparatus for measuring travel time differences of ultrasonic pulses for the determination of flow fields
    Patent number: 4493217
    Abstract: Laser beams are modulated by ultrasonic pulses transmitted through gaseous media as a means of determining flow field patterns and temperatures without disturbing the test media.
    Type: Grant
    Filed: August 17, 1982
    Date of Patent: January 15, 1985
    Assignee: Deutsche Forschungs- und Versuchsanstalt fur Luft- und Raumfahrt e.V.
    Inventors: Rolf Engler, Rudolf Wulf
  • Ultrasonic transducer
    Patent number: 4432237
    Abstract: Ultrasonic transducers, of an electrical capacitor formed of a counter-elrode and a synthetic material film lying thereon, held by a clamping ring and metallized on one side, are used amongst other things for running time measurements in flow field examinations in wind tunnels. It is in that case important to disturb the flow as little as possible by the spatial dimensions of the ultrasonic transducer and by the necessary mountings and current feeds. For the solution of the problem, it is proposed to fasten the counter-electrode (2) and the clamping ring (3) holding the synthetic material film (5) electrically insulated therefrom on a conductor plate (6) and electrically conductively to connect each with a respective conductor track portion (7, 8 or 7, 10, 8, 9).
    Type: Grant
    Filed: January 25, 1982
    Date of Patent: February 21, 1984
    Assignee: Deutsche Forschungs-und Versuchsanstalt fur Luft-und Raumfahrt e.V.
    Inventors: Dieter Schmidt, Rolf Engler