Patents Assigned to Deutsche Forschungsanstatt fur Luft- und Raumfahrt e.V.
  • Laser interferometer strain sensor with adjustable feedback amplification in the form of a saw-tooth pattern
    Patent number: 5508804
    Abstract: An interferometer strain sensor or gauge comprises a laser diode coupled to an interferometer with an opto-electric output converter, the output of which is supplied via a differentiating unit to an interference-fringe counter and via a feedback amplifier to the current supply of the laser diode to vary the wavelength thereof, the interference signal being in the form of a saw-tooth pattern with steep edges to produce rapid transitions for the differentiating unit.
    Type: Grant
    Filed: March 28, 1994
    Date of Patent: April 16, 1996
    Assignee: Deutsche Forschungsanstatt fur Luft- und Raumfahrt e.V.
    Inventor: Norbert Furstenau