The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 14, 2003
Filed:
Aug. 25, 2000
Owen D. Parham, La Habra, CA (US);
David A. Castleman, Fresno, CA (US);
Fire Sentry Corporation, Brea, CA (US);
Abstract
A process and system for flame detection includes a microprocessor-controlled detector with a first sensor for sensing temporal energy in a first optical frequency range, and a second sensor for sensing temporal energy in a second optical frequency range. The temporal energy sensed in the respective first and second optical frequency ranges are transformed into respective first and second spectra of frequency components. A compensated spectrum of frequency components is generated by performing a frequency bin subtraction of the first and second spectra of frequency components. The compensated spectrum of frequency components represents the energy emitted from the environment with energy emitted from false alarm sources. An average amplitude and centroid of the compensated spectrum of frequency components are obtained and used to determine if a monitored phenomenon represents an unwanted fire situation. The compensated spectrum of frequency components can be compared to reference compensated spectra of frequency components generated from known unwanted fire sources and known false alarm sources. This comparison can be facilitated by constructing a frequency space scatter plot from respective average amplitudes and centroids obtained from the reference compensated spectra. A fire detection boundary can be defined, which excludes substantially all of the false alarm sources. Inclusion of the unknown phenomenon within the fire detection boundary is indicative of an unwanted fire situation.