Patents by Inventor Stephen P. Callaghan

Stephen P. Callaghan 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).

  • Dither signal remover for a dithered ring laser angular rate sensor
    Patent number: 4898469
    Abstract: Readout signals of a dithered ring laser angular sensor are processed by a signal combining circuit which forms part of a closed-loop dither signal remover scheme. The output of the signal combining circuit is demodulated as a function of the dither applied to the ring laser sensor and subsequently utilized to control a correction signal. The signal combining circuit combines the readout signal and the correction signal to yield an output signal stripped of substantially any dither signal components.
    Type: Grant
    Filed: October 4, 1988
    Date of Patent: February 6, 1990
    Inventors: Wesley C. Sewell, Stephen P. Callaghan
  • Dither signal remover for a dithered ring laser angular rate sensor
    Patent number: 4826320
    Abstract: Readout signals of a dithered ring laser angular sensor are processed by a signal combining circuit which forms part of a closed-loop dither signal remover scheme. The output of the signal combining circuit is demodulated as a function of the dither applied to the ring laser sensor and subsequently utilized to control a correction signal. The signal combining circuit combines the readout signal and the correction signal to yield an output signal stripped of substantially any dither signal components.
    Type: Grant
    Filed: May 24, 1985
    Date of Patent: May 2, 1989
    Assignee: Honeywell Inc.
    Inventors: Stephen P. Callaghan, Joseph E. Killpatrick, Wesley C. Sewell
  • Readout for a ring laser
    Patent number: 4582429
    Abstract: Disclosed is a readout apparatus for obtaining single beam and double beam signals for a ring laser angular rate sensor.
    Type: Grant
    Filed: April 6, 1983
    Date of Patent: April 15, 1986
    Assignee: Honeywell
    Inventor: Stephen P. Callaghan
  • Discriminant apparatus for laser gyros
    Patent number: 4551021
    Abstract: A discriminant apparatus for laser angular rate sensors which provides an output signal related to a selected weighted vectorial sum of the coupling of energy between counterpropagating waves traveling about a closed-loop path. The discriminant apparatus is utilized in a closed-loop control system for minimizing the lock-in rate of the sensor and/or maintaining and selecting scale factor linearity.
    Type: Grant
    Filed: March 1, 1982
    Date of Patent: November 5, 1985
    Assignee: Honeywell Inc.
    Inventors: Stephen P. Callaghan, Timothy J. Callaghan, Harry A. Gustafson, Wah L. Lim