FR2235440A1 - Ultrasonic intruder detector system - has central unit which controls parallel emitters and has receivers triggering alarm - Google Patents

Ultrasonic intruder detector system - has central unit which controls parallel emitters and has receivers triggering alarm

Info

Publication number
FR2235440A1
FR2235440A1 FR7421086A FR7421086A FR2235440A1 FR 2235440 A1 FR2235440 A1 FR 2235440A1 FR 7421086 A FR7421086 A FR 7421086A FR 7421086 A FR7421086 A FR 7421086A FR 2235440 A1 FR2235440 A1 FR 2235440A1
Authority
FR
France
Prior art keywords
receivers
central unit
detector system
triggering alarm
ultrasonic
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.)
Granted
Application number
FR7421086A
Other languages
French (fr)
Other versions
FR2235440B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cerberus AG
Original Assignee
Cerberus AG
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 by Cerberus AG filed Critical Cerberus AG
Publication of FR2235440A1 publication Critical patent/FR2235440A1/en
Application granted granted Critical
Publication of FR2235440B1 publication Critical patent/FR2235440B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • 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
    • G08B13/1609—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems
    • G08B13/1618—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Burglar Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

The central unit feeds the required frequency a.c. to the emitters of ultrasonic radiation and at the same time supplies the receivers which modulate the d.c. current with changes in the detected ultrasonic reflection. The latter are due to Doppler effect produced by the presence of an intruder within the field of emitted ultrasonic waves, and this in turn results in the generation of a warning signal. The receivers comprise a circuit for a.c. rectification connected as a supply for the strobing circuit, and the changes in the d.c. current are sensed by the central unit for tripping the alarm.
FR7421086A 1973-06-28 1974-06-18 Ultrasonic intruder detector system - has central unit which controls parallel emitters and has receivers triggering alarm Granted FR2235440A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH945473A CH557070A (en) 1973-06-28 1973-06-28 PROCEDURE FOR GENERATING AN ALARM SIGNAL AND ALARM SYSTEM FOR CARRYING OUT THE PROCEDURE.

Publications (2)

Publication Number Publication Date
FR2235440A1 true FR2235440A1 (en) 1975-01-24
FR2235440B1 FR2235440B1 (en) 1978-02-17

Family

ID=4352171

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7421086A Granted FR2235440A1 (en) 1973-06-28 1974-06-18 Ultrasonic intruder detector system - has central unit which controls parallel emitters and has receivers triggering alarm

Country Status (4)

Country Link
JP (1) JPS5513074B2 (en)
CH (1) CH557070A (en)
DE (1) DE2423185A1 (en)
FR (1) FR2235440A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3428773A1 (en) * 1984-08-03 1986-02-13 Siemens AG, 1000 Berlin und 8000 München ULTRASONIC PROXIMITY INITIATOR

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2769972A (en) * 1954-03-15 1956-11-06 American District Telegraph Co Method and apparatus for detecting motion
CH502657A (en) * 1968-09-05 1971-01-31 Siemens Ag Electroacoustic room surveillance system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4427391Y1 (en) * 1967-06-07 1969-11-15

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2769972A (en) * 1954-03-15 1956-11-06 American District Telegraph Co Method and apparatus for detecting motion
CH502657A (en) * 1968-09-05 1971-01-31 Siemens Ag Electroacoustic room surveillance system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3428773A1 (en) * 1984-08-03 1986-02-13 Siemens AG, 1000 Berlin und 8000 München ULTRASONIC PROXIMITY INITIATOR

Also Published As

Publication number Publication date
JPS5513074B2 (en) 1980-04-05
JPS5039099A (en) 1975-04-10
FR2235440B1 (en) 1978-02-17
DE2423185A1 (en) 1975-01-16
CH557070A (en) 1974-12-13

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Legal Events

Date Code Title Description
ST Notification of lapse