EP 0103375 A1 19840321 - Alarm system.
Title (en)
Alarm system.
Title (de)
Alarmsystem.
Title (fr)
Système d'alarme.
Publication
Application
Priority
GB 8221215 A 19820722
Abstract (en)
An alarm system in which a fire alarm is activated only when both movement and radiation having characteristics associated with fire emitted radiation are detected. Movement can be detected by a Doppler shift ultrasonic device, and fire emitted radiation by an infra red device. The system avoids false alarms as experienced with ultrasonic and infra red systems operating in isolation. The system may also incorporate an intruder alarm activated only when movement and infra red radiation associated with body movement are detected. The source of infra red radiation may be discriminated by monitoring the flicker frequency of that radiation, the flicker frequency of fire emitted radiation being greater than the flicker frequency of human body emitted radiation.
IPC 1-7
IPC 8 full level
G08B 13/00 (2006.01); G08B 13/16 (2006.01); G08B 13/19 (2006.01); G08B 17/12 (2006.01); G08B 19/00 (2006.01)
CPC (source: EP)
G08B 13/1645 (2013.01); G08B 13/19 (2013.01); G08B 17/12 (2013.01); G08B 19/005 (2013.01)
Citation (search report)
- [A] US 4100543 A 19780711 - STOCKDALE ROY, et al
- [A] DE 2820343 A1 19790111 - CERBERUS AG
- [A] DE 1078016 C
- [A] US 3745550 A 19730710 - ANTHONY M, et al
- [A] US 4052716 A 19771004 - MORTENSEN TAGE A
- [A] US 4321591 A 19820323 - VIEWEG THOMAS
Designated contracting state (EPC)
DE FR GB IT SE
DOCDB simple family (publication)
EP 0103375 A1 19840321; EP 0103375 B1 19870114; DE 3369214 D1 19870219; JP S5968092 A 19840417
DOCDB simple family (application)
EP 83304173 A 19830719; DE 3369214 T 19830719; JP 13201383 A 19830721