FR2394134A1 - Dispositif d'alarme - Google Patents

Dispositif d'alarme

Info

Publication number
FR2394134A1
FR2394134A1 FR7717283A FR7717283A FR2394134A1 FR 2394134 A1 FR2394134 A1 FR 2394134A1 FR 7717283 A FR7717283 A FR 7717283A FR 7717283 A FR7717283 A FR 7717283A FR 2394134 A1 FR2394134 A1 FR 2394134A1
Authority
FR
France
Prior art keywords
circuit
altered
frequency
received signal
moving object
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.)
Withdrawn
Application number
FR7717283A
Other languages
English (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.)
ACET Srl
Original Assignee
ACET Srl
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 ACET Srl filed Critical ACET Srl
Priority to FR7717283A priority Critical patent/FR2394134A1/fr
Publication of FR2394134A1 publication Critical patent/FR2394134A1/fr
Withdrawn legal-status Critical Current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
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2491—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G01S13/56—Discriminating between fixed and moving objects or between objects moving at different speeds for presence detection

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

Dispositif d'alarme. Le dispositif comprend un organe détecteur émettant un signal de fréquence prédéterminé et de portée éventuellement reglable et recevant un signal de fréquence différent si le signal émis a rencontré un obstacle mobile, un organe analyseur du signal reçu relié à la sortie de l'organe détecteur comprenant des organes de blocage et de temporisation et un organe de commande d'alarme à temporisation réglable relié à la sortie de l'organe analyseur. Surveillance d'un local.
FR7717283A 1977-06-06 1977-06-06 Dispositif d'alarme Withdrawn FR2394134A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7717283A FR2394134A1 (fr) 1977-06-06 1977-06-06 Dispositif d'alarme

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7717283A FR2394134A1 (fr) 1977-06-06 1977-06-06 Dispositif d'alarme

Publications (1)

Publication Number Publication Date
FR2394134A1 true FR2394134A1 (fr) 1979-01-05

Family

ID=9191736

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7717283A Withdrawn FR2394134A1 (fr) 1977-06-06 1977-06-06 Dispositif d'alarme

Country Status (1)

Country Link
FR (1) FR2394134A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2498352A1 (fr) * 1981-01-20 1982-07-23 Seriee Dispositif de traitement de signaux pour la detection et l'alarme de signaux doppler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2498352A1 (fr) * 1981-01-20 1982-07-23 Seriee Dispositif de traitement de signaux pour la detection et l'alarme de signaux doppler

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Legal Events

Date Code Title Description
ST Notification of lapse