Patents by Inventor Geoffrey Duxbury

Geoffrey Duxbury 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).

  • Semiconductor diode laser spectrometer arrangement and method
    Patent number: 7283243
    Abstract: A method apparatus for sensing gases using a semiconductor diode laser spectrometer, the method comprising: introducing a sample gas into a non-resonant optical cell (17); applying a step function electrical pulse (19) to a semiconductor diode laser (20) to cause the laser (20) to output a continuous wavelength chirp for injecting (16a) into the optical cell (17); injecting (16a) the wavelength chirp into the optical cell (17); using the wavelength variation provided by the wavelength chirp as a wavelength scan, and detecting (23) light emitted from the cell (17), wherein a chirp rate is selected to substantially prevent light interference occurring in the optical cell (17).
    Type: Grant
    Filed: April 8, 2003
    Date of Patent: October 16, 2007
    Assignee: Cascade Technologies Limited
    Inventors: Nigel Langford, Geoffrey Duxbury, Erwan Normand
  • Semiconductor diode laser spectrometer arrangement and method
    Publication number: 20050157303
    Abstract: A method apparatus for sensing gases using a semiconductor diode laser spectrometer, the method comprising: introducing a sample gas into a non-resonant optical cell (17); applying a step function electrical pulse (19) to semiconductor diode laser (20) to cause the laser (20) to output a continuous wavelength chirp for injecting (16a) into the optical cell injecting (16a) the wavelengh chirp into the optical cell (17); using the wavelength variation provided by the wavelength detecting (23) light emitted from the cell (17), wherein a chirp rate is selected to substantially prevent light interference occuring in the optical cell (17).
    Type: Application
    Filed: April 8, 2003
    Publication date: July 21, 2005
    Inventors: Nigel Langford, Geoffrey Duxbury, Erwan Normand