FR2284863A1 - Doppler effect ultrasonic displacement detector - measures shift in frequency of waves reflected from moving objects - Google Patents

Doppler effect ultrasonic displacement detector - measures shift in frequency of waves reflected from moving objects

Info

Publication number
FR2284863A1
FR2284863A1 FR7526883A FR7526883A FR2284863A1 FR 2284863 A1 FR2284863 A1 FR 2284863A1 FR 7526883 A FR7526883 A FR 7526883A FR 7526883 A FR7526883 A FR 7526883A FR 2284863 A1 FR2284863 A1 FR 2284863A1
Authority
FR
France
Prior art keywords
frequency
doppler effect
moving objects
displacement detector
waves reflected
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Withdrawn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
FR7526883A
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of FR2284863A1 publication Critical patent/FR2284863A1/en
Withdrawn legal-status Critical Current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
    • G08B13/16—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
    • 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
    • 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
    • G01S15/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G01S15/586—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves and based upon the Doppler effect resulting from movement of targets

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 detector has an ultrasonic transducer, e.g. a piezoelectric crystal, (W1) which is excited in order to produce ultrasonic oscillations at a transmission frequency (fo). Objects moving w.r.t. this transducer reflect these ultrasonic waves and modify their frequency by the Doppler effect. In the excitation circuit, there is a unit which measures the Doppler frequency shift (fD). This may be a low pass filter (R3C1) with a time constant of the order of fD-1. A bipolar transistor (T1) may be included in the excitation circuit with this filter connected to its base.
FR7526883A 1974-09-12 1975-09-02 Doppler effect ultrasonic displacement detector - measures shift in frequency of waves reflected from moving objects Withdrawn FR2284863A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742443744 DE2443744A1 (en) 1974-09-12 1974-09-12 ULTRASONIC MOTION DETECTOR

Publications (1)

Publication Number Publication Date
FR2284863A1 true FR2284863A1 (en) 1976-04-09

Family

ID=5925604

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7526883A Withdrawn FR2284863A1 (en) 1974-09-12 1975-09-02 Doppler effect ultrasonic displacement detector - measures shift in frequency of waves reflected from moving objects

Country Status (7)

Country Link
JP (1) JPS5153869A (en)
BE (1) BE833365A (en)
DE (1) DE2443744A1 (en)
FR (1) FR2284863A1 (en)
IT (1) IT1042415B (en)
NL (1) NL7509852A (en)
SE (1) SE7510073L (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2412209A1 (en) * 1977-12-14 1979-07-13 Danfoss As TRANSMITTER-RECEIVER CONNECTION
EP0494349A2 (en) * 1991-01-11 1992-07-15 Deutsche Aerospace AG Sensor for an interior, particularly in a motor vehicle
EP0683400A1 (en) * 1994-05-17 1995-11-22 Valeo Electronique Method and device for movement detection using ultrasonics and the Doppler-effect, and intrusion alarm device for a compartment, particularly of a vehicle

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2412209A1 (en) * 1977-12-14 1979-07-13 Danfoss As TRANSMITTER-RECEIVER CONNECTION
EP0494349A2 (en) * 1991-01-11 1992-07-15 Deutsche Aerospace AG Sensor for an interior, particularly in a motor vehicle
EP0494349A3 (en) * 1991-01-11 1992-11-19 Telefunken Systemtechnik Gmbh Sensor for an interior, particularly in a motor vehicle
EP0683400A1 (en) * 1994-05-17 1995-11-22 Valeo Electronique Method and device for movement detection using ultrasonics and the Doppler-effect, and intrusion alarm device for a compartment, particularly of a vehicle
FR2720163A1 (en) * 1994-05-17 1995-11-24 Valeo Electronique Doppler effect detection method using ultrasonic radiation, Doppler effect detection device and anti-intrusion alarm device for passenger compartment including vehicle.

Also Published As

Publication number Publication date
DE2443744A1 (en) 1976-04-01
NL7509852A (en) 1976-03-16
IT1042415B (en) 1980-01-30
BE833365A (en) 1975-12-31
SE7510073L (en) 1976-03-15
JPS5153869A (en) 1976-05-12

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Legal Events

Date Code Title Description
ST Notification of lapse