Fire sensor statistical discriminator
Patent 4665390 Issued on May 12, 1987. Estimated Expiration Date: 
August 22, 2005. Estimated 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.
August 22, 2005. Estimated 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.Patent ReferencesTwo channel comparison-type fire or explosion detecting system Dual spectrum fire sensor with discriminator Optical fire detection system responsive to spectral content and flicker frequency Infrared intrusion alarm system capable of preventing false signals Patent #: 4570157 InventorsApplicationNo. 06/768539 filed on 08/22/1985US Classes:340/587, False alarm resistant340/578, By radiant energy700/90, SPECIFIC APPLICATION, APPARATUS OR PROCESS702/66Waveform analysisExaminersPrimary: Swann, III, Glen R.Attorney, Agent or FirmInternational ClassG08B 17/12 (20060101)AbstractCircuitry for using the statistical properties of detected radiation in the time domain to discriminate between stimuli from fire and non-fire sources. Statistical discriminators for fire sensing may be combined with other types of sensors operating in the frequency domain for developing improved sensitivity with better security against false alarms. Such other types of sensors may include peak detectors, zero crossing detectors, second derivative-equal-to-zero detectors, for example. The invention determines the mean or average, the variance or standard deviation, the mean deviation, and the Kurtosis of sampled data in statistical analysis to discriminate between fires and non-fires.Field of SearchFalse alarm resistant | |
