Dual wavelength fire detection method and apparatus
January 7, 2017. 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 References 3824391 3859520 Detection of presence or absence of flames Discriminating fire sensor Flame sensing system Two channel optical flame detector Optical flame and explosion detection system and method Flame detector Dual spectrum infrared fire sensor Fire and explosion detection InventorAssigneeApplicationNo. 779723 filed on 01/07/1997US Classes:340/578, By radiant energy250/339.15Sensing flame or explosionExaminersPrimary: Mullen, Thomas J. Jr.Assistant: Tweel, John Jr. Attorney, Agent or FirmForeign Patent References
International ClassG08B 017/12AbstractA method for extracting a number of temporal frequencies occurring in a fire and false fire condition concurrently from two or more radiation detectors for receiving signals, a correlation detector for each frequency and sensor, and a storage buffer for the temporal frequencies extracted and sensors employed, so as to distinguish a small fire signal in the presence of a much larger false fire signal whether random in nature or not. The ratio of each extracted frequency following proper qualification is compared to the ratio band for fire and an output signal is generated when the ratio at one or more temporal frequencies indicates a fire. | |
