FR2352355A1 - Ultrasonic Doppler movement detector - has evaluation circuit adjusting interference amplitude to level below threshold of limiting diodes - Google Patents

Ultrasonic Doppler movement detector - has evaluation circuit adjusting interference amplitude to level below threshold of limiting diodes

Info

Publication number
FR2352355A1
FR2352355A1 FR7716623A FR7716623A FR2352355A1 FR 2352355 A1 FR2352355 A1 FR 2352355A1 FR 7716623 A FR7716623 A FR 7716623A FR 7716623 A FR7716623 A FR 7716623A FR 2352355 A1 FR2352355 A1 FR 2352355A1
Authority
FR
France
Prior art keywords
amplifier
movement detector
limiting diodes
evaluation circuit
level below
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Withdrawn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
FR7716623A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of FR2352355A1 publication Critical patent/FR2352355A1/en
Withdrawn legal-status Critical Current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
    • G01S15/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G01S15/523—Discriminating between fixed and moving objects or between objects moving at different speeds for presence detection
    • 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
    • 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)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

The signals are coming from at least one adaptor of the movement detector, and the adaptor has pref. two ultrasonic transducers, each of which is a sender and a receiver and is excited by an oscillator. It receives the signal reflected from a moving object, whose frequency is shifted by the Doppler effect. It is evaluated after amplification in an amplifier with AGC. Signals are applied to the input of a control amplifier whose output is connected through a further amplifier to a current amplitude detector, connected together with a nominal value generator to an integrator. Output of the latter is connected to the control input of the control amplifier, so that interference amplitude is adjusted to a maximum value over a correspondingly long time constant. Themaximum is such that threshold of limiting diodes in the signal path of amplifier is not exceeded.
FR7716623A 1976-05-19 1977-05-18 Ultrasonic Doppler movement detector - has evaluation circuit adjusting interference amplitude to level below threshold of limiting diodes Withdrawn FR2352355A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762622192 DE2622192A1 (en) 1976-05-19 1976-05-19 CIRCUIT ARRANGEMENT FOR THE EVALUATION OF SIGNALS COMING FROM AT LEAST ONE ADAPTER OF AN ULTRASONIC MOTION DETECTOR ACCORDING TO THE DOPPLER PRINCIPLE

Publications (1)

Publication Number Publication Date
FR2352355A1 true FR2352355A1 (en) 1977-12-16

Family

ID=5978336

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7716623A Withdrawn FR2352355A1 (en) 1976-05-19 1977-05-18 Ultrasonic Doppler movement detector - has evaluation circuit adjusting interference amplitude to level below threshold of limiting diodes

Country Status (4)

Country Link
JP (1) JPS52142561A (en)
DE (1) DE2622192A1 (en)
FR (1) FR2352355A1 (en)
IT (1) IT1084695B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3127345A1 (en) * 1981-07-10 1983-01-27 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for ultrasonic intruder alarm systems which operate according to the ultrasonic Doppler method

Also Published As

Publication number Publication date
IT1084695B (en) 1985-05-28
JPS52142561A (en) 1977-11-28
DE2622192A1 (en) 1977-11-24

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Legal Events

Date Code Title Description
ST Notification of lapse