Patents by Inventor John C. O'Connell

John C. O'Connell 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).

  • Self-normalizing single-beam laser spectrometer
    Patent number: 4937448
    Abstract: Self-normalization of laser spectrometers is provided by I"/I laser modulation and detection. A single tunable diode laser is frequency modulated by a high S/N ratio triangle wave, mechanically chopped, passed through an isothermal in-line gas and reference chamber absorption cell, and synchronously detected to provide the I" and I signals. The preferred embodiment discloses isotopic ratio measurements. The invention has application to quantitative trace gas measurements generally.
    Type: Grant
    Filed: May 26, 1988
    Date of Patent: June 26, 1990
    Assignee: Spectra-Physics, Inc.
    Inventors: Arlan W. Mantz, John C. O'Connell