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US Patent 6150659 - Digital multi-frequency infrared flame detector

US Patent Issued on November 21, 2000
Estimated Patent Expiration Date: Icon_subject April 10, 2018Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
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Abstract

A flame detector consisting of a first infrared radiation detector for detecting radiation from combustion of hydrocarbon and other carbon containing compounds in conjunction with a second infrared radiation detector for distinguishing radiation from other sources such as modulated sunlight, reflections, artificial as well as natural hot objects, illuminating light sources, and arc welders. The flame detector uses two electronic circuits following the first infrared detector such that a fire is sensed by either of the two circuits depending on its size, one circuit being optimized for flicker frequencies present in a large fire while the second circuit simultaneously checks for optical signals at flicker frequencies dominant in a smaller fire. The two electronic outputs along with the output of the second infrared detector are digitally processed and analyzed for spectral and temporal characteristics to distinguish the presence of a real fire from that of various false alarm sources. The flame detector is provided with digital serial communications so as to output its status, permit changes in the programming of operating parameters and modes and permit troubleshooting via remote control.

Inventors

Assignee

Application

No. 058662 filed on 04/10/1998

US Classes:

250/339.15, Sensing flame or explosion250/342Locating infrared emissive objects

Field of Search

250/339.15, Sensing flame or explosion250/339.14, Detecting infrared emissive objects250/342, Locating infrared emissive objects356/213, PHOTOMETERS356/226, Detector and indicator electrical coupling (e.g., amplifying or attenuating)356/904, MEASURING MICROSCOPES (GO1B 9/04)136/213, Radiation pyrometer340/584, Thermal340/500, CONDITION RESPONSIVE INDICATING SYSTEM340/501With particular system function (e.g., temperature compensation, calibration)

Examiners

Primary: Ham, Seungsook
Assistant: Patti, John

US Patent References

3122638, 3739365, 3761715, 3825754, 3931521, Dual spectrum infrared fire detector
Issued on: 01/06/1976
Inventor: Cinzori
4206454, Two channel optical flame detector
Issued on: 06/03/1980
Inventor: Schapira ,   et al.
4220857, Optical flame and explosion detection system and method
Issued on: 09/02/1980
Inventor: Bright
4249168, Flame detector
Issued on: 02/03/1981
Inventor: Muggli
4296324, Dual spectrum infrared fire sensor
Issued on: 10/20/1981
Inventor: Kern ,   et al.
4639598, Fire sensor cross-correlator circuit and method
Issued on: 01/27/1987
Inventor: Kern ,   et al.
4983853, Method and apparatus for detecting flame
Issued on: 01/08/1991
Inventor: Davall, et al.
5537336, On-site oil analyzer
Issued on: 07/16/1996
Inventor: Joyce
5612676, Dual channel multi-spectrum infrared optical fire and explosion detection system
Issued on: 03/18/1997
Inventor: Plimpton, et al.
5807750, Optical substance analyzer and data processor
Issued on: 09/15/1998
Inventor: Baum, et al.
5923422, Method of obtaining an optical FT spectrum
Issued on: 07/13/1999
Inventor: Keens, et al.
5959730, Apparatus and method for real-time spectral alignment for open-path fourier transform infrared spectrometers
Issued on: 09/28/1999
Inventor: Wang, et al.
5963322Optical spectrometer and method of implementing optical spectroscopy
Issued on: 10/05/1999
Inventor: Rapp, et al.

Foreign Patent References

  • 0 588 753 A1 EP. 03/20/1994

International Class

G01J 005/02

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