Acoustic fire detection circuit responsive to micro-capsule...

Details Acoustic fire detection circuit responsive to micro-capsule... Acoustic fire detection circuit responsive to micro-capsule...

G - Physics

08

B

349/29

G08B 17/00 (2006.01) G08B 17/08 (2006.01)

Patent

CA 1139419

- 15 - INSTALLATION FOR DETECTING FIRES AS SOON AS THEY BREAK OUT ABSTRACT OF THE DISCLOSURE This installation comprises, for the early detection of an abnormal rise in the temperature in an enclosure to be protected, a large number of micro-containers which are arranged in the enclosure. These micro-containers are for example incorporated in the paint coating the walls of the enclosure. The micro-containers are filled with an extinguishing gas and produce when they burst a characteris- tic noise which is detected by microphones. The installation also comprises for the purpose of avoiding false alarms and achieving an adequate discrimination of the useful signal from that produced by the normal surround- ing noise, a combined filtering and processing circuit which operates in an essentially digital manner.

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