FR972292A - Infra-sound detectors and alarms and their application to the detection of openings of doors and windows - Google Patents

Infra-sound detectors and alarms and their application to the detection of openings of doors and windows

Info

Publication number
FR972292A
FR972292A FR972292DA FR972292A FR 972292 A FR972292 A FR 972292A FR 972292D A FR972292D A FR 972292DA FR 972292 A FR972292 A FR 972292A
Authority
FR
France
Prior art keywords
alarms
infra
doors
windows
openings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
French (fr)
Inventor
Ernest Esclangon
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Application granted granted Critical
Publication of FR972292A publication Critical patent/FR972292A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
    • G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
    • G08B13/1681—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using infrasonic detecting means, e.g. a microphone operating below the audible frequency range
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B19/00—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
    • G08B19/005—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow combined burglary and fire alarm systems

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR972292D 1942-09-10 1941-01-18 Infra-sound detectors and alarms and their application to the detection of openings of doors and windows Expired FR972292A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR55579T 1942-09-10

Publications (1)

Publication Number Publication Date
FR972292A true FR972292A (en) 1951-01-29

Family

ID=8689882

Family Applications (2)

Application Number Title Priority Date Filing Date
FR972292D Expired FR972292A (en) 1942-09-10 1941-01-18 Infra-sound detectors and alarms and their application to the detection of openings of doors and windows
FR55579D Expired FR55579E (en) 1942-09-10 1942-09-10 Infra-sound detectors and alarms and their application to the detection of openings of doors and windows

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR55579D Expired FR55579E (en) 1942-09-10 1942-09-10 Infra-sound detectors and alarms and their application to the detection of openings of doors and windows

Country Status (1)

Country Link
FR (2) FR972292A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2523339A1 (en) * 1982-03-12 1983-09-16 Guglielmetti Vg Electro INFRA-SOUND VOLUMETRIC SENSOR DETECTION DEVICE AND INFRA-SOUND DETECTION METHOD
WO1985004744A1 (en) * 1984-04-05 1985-10-24 Base Electronic Gmbh Method and device for the security of closed rooms
FR2576438A1 (en) * 1985-01-18 1986-07-25 Richard Lepan Alarm detector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2523339A1 (en) * 1982-03-12 1983-09-16 Guglielmetti Vg Electro INFRA-SOUND VOLUMETRIC SENSOR DETECTION DEVICE AND INFRA-SOUND DETECTION METHOD
US4586031A (en) * 1982-03-12 1986-04-29 Electronique Guglielmetti V.G. Electronique Infra-sonic detector, and alarms including same
WO1985004744A1 (en) * 1984-04-05 1985-10-24 Base Electronic Gmbh Method and device for the security of closed rooms
FR2576438A1 (en) * 1985-01-18 1986-07-25 Richard Lepan Alarm detector

Also Published As

Publication number Publication date
FR55579E (en) 1952-09-01

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