Early fire detection using temperature and smoke sensing

Details Early fire detection using temperature and smoke sensing Early fire detection using temperature and smoke sensing

1996-07-02

1998-10-06

Hofsass, Jeffery A.

Communications: electrical

Systems

Manual alarm telegraph; e.g., other than signal box type

340628, 340511, 340522, G08B 1710

Patent

active

058183264

ABSTRACT:
A fire detection system cross correlates the responses of a temperature and smoke sensing units to achieve early-detection characteristics. The system also performs threshold-type detection on the smoke obscuration, temperature, and rate of temperature rise. If any of the thresholds are surpassed, the same alarm condition will be set. As a result, the detection characteristics of the resulting detector can be no worse than the conventional threshold-only systems. The system advantageously, however, provides for the early detection of fires that satisfy the cross correlation characteristics. Thus, it achieves the best performance characteristics of both approaches.

REFERENCES:
patent: 4639598 (1987-01-01), Kein et al.
patent: 4644331 (1987-02-01), Matsushita et al.
patent: 4709229 (1987-11-01), Otsuka
patent: 4884222 (1989-11-01), Nagashima et al.
patent: 5592147 (1997-01-01), Wong

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