Patents by Inventor Peter W. N. Davall

Peter W. N. Davall 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).

  • Method and apparatus for detecting flame with adjustable optical coupling
    Patent number: 5107128
    Abstract: A method of detecting flame within a region where flame is expected. Radiation emissions from the region are measured within selected portions of the visible and infra-red frequency bands. Spectral characteristics of the two measurements, including their auto spectra, coherency and transfer function, are derived. The derived spectral characteristics are compared with prestored spectral signatures representative of the spectral characteristics of radiation emitted from the region within the selected portions of the visible and infra-red frequency bands while known flame conditions prevail within the region--thereby estimating the deviation of the derived spectral characteristics from the prestored spectral signatures. The deviations aforesaid are compared with predetermined threshold alarm values to assess the presence or absence of flame.
    Type: Grant
    Filed: November 6, 1990
    Date of Patent: April 21, 1992
    Assignee: Saskatchewan Power Corporation
    Inventors: Peter W. N. Davall, John D. Spencer
  • Method and apparatus for detecting flame
    Patent number: 4983853
    Abstract: A method of detecting flame within a region where flame is expected. Radiation emissions from the region are measured within selected portions of the visible and infra-red frequency bands. Spectral characteristics of the two measurements, including their auto spectra, coherency and transfer function, are derived. The derived spectral characteristics are compared with prestored spectral signatures representative of the spectral characteristics of radiation emitted from the region within the selected portions of the visible and infra-red frequency bands while known flame conditions prevail within the region--thereby estimating the deviation of the derived spectral characteristics from the prestored spectral signatures. The deviations aforesaid are compared with predetermined threshold alarm values to assess the presence or absence of flame.
    Type: Grant
    Filed: May 5, 1989
    Date of Patent: January 8, 1991
    Assignee: Saskatchewan Power Corporation
    Inventors: Peter W. N. Davall, John D. Spencer