FR1456830A - Improvements to devices for detecting the presence of objects - Google Patents

Improvements to devices for detecting the presence of objects

Info

Publication number
FR1456830A
FR1456830A FR31232A FR31232A FR1456830A FR 1456830 A FR1456830 A FR 1456830A FR 31232 A FR31232 A FR 31232A FR 31232 A FR31232 A FR 31232A FR 1456830 A FR1456830 A FR 1456830A
Authority
FR
France
Prior art keywords
objects
detecting
devices
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
FR31232A
Other languages
French (fr)
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.)
Decca Ltd
Original Assignee
Decca Ltd
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 Decca Ltd filed Critical Decca Ltd
Priority to FR31232A priority Critical patent/FR1456830A/en
Application granted granted Critical
Publication of FR1456830A publication Critical patent/FR1456830A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/50—Systems of measurement, based on relative movement of the target
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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
    • G08B13/1627—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means using Doppler shift detection circuits

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
FR31232A 1965-09-13 1965-09-13 Improvements to devices for detecting the presence of objects Expired FR1456830A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR31232A FR1456830A (en) 1965-09-13 1965-09-13 Improvements to devices for detecting the presence of objects

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR31232A FR1456830A (en) 1965-09-13 1965-09-13 Improvements to devices for detecting the presence of objects

Publications (1)

Publication Number Publication Date
FR1456830A true FR1456830A (en) 1966-07-08

Family

ID=8588237

Family Applications (1)

Application Number Title Priority Date Filing Date
FR31232A Expired FR1456830A (en) 1965-09-13 1965-09-13 Improvements to devices for detecting the presence of objects

Country Status (1)

Country Link
FR (1) FR1456830A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1039313A1 (en) * 1999-03-17 2000-09-27 Valeo Services Limited Intrusion detection process and device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1039313A1 (en) * 1999-03-17 2000-09-27 Valeo Services Limited Intrusion detection process and device

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