Patents by Inventor Jens-Uwe Hagenah

Jens-Uwe Hagenah 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).

  • System for measuring the concentration of a gaseous component by detecting positions of mode jumps in a laser diode
    Patent number: 5202560
    Abstract: The invention is directed to a method of operating a laser diode in a measuring system for spectroscopically measuring the concentration of a gaseous component in a gas sample. This method is improved in that the mode jumps of the laser diode are easily recognized when adjusting the temperature-current operating point of the laser diode. An optical filter is placed in the beam path for adjusting the temperature-current operating point of the laser diode and, by changing the temperature T and the operating current I of the laser diode while simultaneously receiving the output signal supplied by an evaluation unit, the spectral positions of the mode jumps of the laser diode are determined which are included in the absorption lines of the gas sample. Thereafter, the temperature-current operating point is adjusted so that the distance of this operating point to the positions of the mode jumps is not less than a fixed spacing.
    Type: Grant
    Filed: June 26, 1992
    Date of Patent: April 13, 1993
    Assignee: Dragerwerk Aktiengesellschaft
    Inventors: Edmund Koch, Jens-Uwe Hagenah, Christoph Maurer, Ulrich Heim, Wilfried Diekmann, Johann Otten