Patents by Inventor Thomas Roesgen

Thomas Roesgen 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).

  • Method and an apparatus for determining the clearance between a turbine casing and the tip of a moving turbine blade
    Patent number: 7400418
    Abstract: It is disclosed a method and an apparatus of determining the distance (D) between a collimator lens (13) and an object. Low-coherence light is emitted from a light source (1) and directed the low-coherence light through a collimator lens (13) to the object. The reflected light from the collimator lens (13) and the object is directed to a beam splitter (4) and split into two beams. Within the reference arm the frequency of the beam is shifted by an acousto-optical modulator (5) to a certain frequency and within the delay arm the time delay of the beam is scanned by a variable delay line (7). After combining both beams in a beam combiner (8), the presence of a frequency component equal to the frequency shift of the acousto-optical modulator (5) is detected and the distance (D) between the collimator lens (13) and the object is calculated.
    Type: Grant
    Filed: July 20, 2005
    Date of Patent: July 15, 2008
    Assignee: Alstom Technology Ltd
    Inventors: Ken-Yves Haffner, Andreas Kempe, Thomas Roesgen, Stefan Schlamp
  • Method and an apparatus for determining the clearance between a turbine casing and the tip of a moving turbine blade
    Publication number: 20060002789
    Abstract: It is disclosed a method and an apparatus of determining the distance (D) between a collimator lens (13) and an object. Low-coherence light is emitted from a light source (1) and directed the low-coherence light through a collimator lens (13) to the object. The reflected light from the collimator lens (13) and the object is directed to a beam splitter (4) and split into two beams. Within the reference arm the frequency of the beam is shifted by an acousto-optical modulator (5) to a certain frequency and within the delay arm the time delay of the beam is scanned by a variable delay line (7). After combining both beams in a beam combiner (8), the presence of a frequency component equal to the frequency shift of the acousto-optical modulator (5) is detected and the distance (D) between the collimator lens (13) and the object is calculated.
    Type: Application
    Filed: July 20, 2005
    Publication date: January 5, 2006
    Applicant: ALSTOM TECHNOLOGY LTD
    Inventors: Ken-Yves Haffner, Andreas Kempe, Thomas Roesgen, Stefan Schlamp