GB1319092A - Ultrasonic motion detector device and method - Google Patents

Ultrasonic motion detector device and method

Info

Publication number
GB1319092A
GB1319092A GB5448870A GB5448870A GB1319092A GB 1319092 A GB1319092 A GB 1319092A GB 5448870 A GB5448870 A GB 5448870A GB 5448870 A GB5448870 A GB 5448870A GB 1319092 A GB1319092 A GB 1319092A
Authority
GB
United Kingdom
Prior art keywords
modulation
integrator
nov
resistor
time constant
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
GB5448870A
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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
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 Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of GB1319092A publication Critical patent/GB1319092A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
    • G01N29/4436—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with a reference signal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/032—Analysing fluids by measuring attenuation of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
    • G01N29/348—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with frequency characteristics, e.g. single frequency signals, chirp signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/36—Detecting the response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/42—Detecting the response signal, e.g. electronic circuits specially adapted therefor by frequency filtering or by tuning to resonant frequency
    • 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
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/10—Number of transducers
    • G01N2291/102—Number of transducers one emitter, one receiver

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Burglar Alarm Systems (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

1319092 Intruder alarms; fire alarms MINNESOTA MINING & MFG CO 16 Nov 1970 [17 Nov 1969] 54488/70 Heading G4N An ultrasonic motion detector receiver responsive to acoustic energy from a carrier wave radiated into a space to be protected comprises an amplifier 36, Q2, a demodulator 40, a limiter Q4, Q5, a bandpass filter 45 and a circuit 60 capable of operating an alarm 61 in response to modulation on said received carrier within a predetermined frequency band and persisting for a predetermined period. The carrier frequency is preferably 40 kHz; active filter 26 having a pass band between 50 and 200 Hz so as to pass modulation due to movement of an intruder or turbulence due to a fire but to reject environmental noises. The integrator 58 has a discharge time constant due to resistor 70 much greater than the charging time constant due to resistor 66 so that a Schmitt circuit 60 will operate the alarm relay 61 in response to a predetermined number of positive half cycles of modulation signals passed by active filter 26. In Fig. 3 (not shown) integrator 56 uses the Miller principle and includes a feedback path to point E so as to adapt the limiting level to the threshhold noise level.
GB5448870A 1969-11-17 1970-11-16 Ultrasonic motion detector device and method Expired GB1319092A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US87717369A 1969-11-17 1969-11-17

Publications (1)

Publication Number Publication Date
GB1319092A true GB1319092A (en) 1973-05-31

Family

ID=25369411

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5448870A Expired GB1319092A (en) 1969-11-17 1970-11-16 Ultrasonic motion detector device and method

Country Status (6)

Country Link
US (1) US3662371A (en)
JP (1) JPS4830199B1 (en)
DE (1) DE2056883A1 (en)
FR (1) FR2069471A5 (en)
GB (1) GB1319092A (en)
NL (1) NL7016278A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824532A (en) * 1971-09-27 1974-07-16 Us Air Force Seismic signal intrusion detection classification system
US3828336A (en) * 1973-07-12 1974-08-06 Dynamics Corp Massa Div Intrusion alarm system with improved air turbulence compensation
JPS51126171A (en) * 1974-12-23 1976-11-04 Yokogawa Hewlett Packard Ltd Detecting device of moving object
US4951045A (en) * 1989-03-29 1990-08-21 Intelligent Safety Technology, Inc. Portable electronic warning device for temporary conditions
US5440290A (en) * 1993-06-07 1995-08-08 Tecsec Incorporated Proximity detection device for protection of personnel against exposure to hazardous radio frequency radiation
IL110163A0 (en) * 1993-06-30 1994-10-07 Sentrol Inc Glass break detector having reduced susceptibility to false alarms
US5539705A (en) * 1994-10-27 1996-07-23 Martin Marietta Energy Systems, Inc. Ultrasonic speech translator and communications system
US6353385B1 (en) 2000-08-25 2002-03-05 Hyperon Incorporated Method and system for interfacing an intrusion detection system to a central alarm system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3258762A (en) * 1966-06-28 Bistable multivibrator means
US2767393A (en) * 1953-08-03 1956-10-16 Kidde & Co Walter Approach alarm system with unwanted signal elimination
US2782405A (en) * 1954-05-27 1957-02-19 Motorola Inc Apparatus for detecting motion in a bconfined space

Also Published As

Publication number Publication date
JPS4830199B1 (en) 1973-09-18
NL7016278A (en) 1971-05-19
US3662371A (en) 1972-05-09
FR2069471A5 (en) 1971-09-03
DE2056883A1 (en) 1971-05-27

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee