GB1392767A - Ultrasonic alarm circuit - Google Patents

Ultrasonic alarm circuit

Info

Publication number
GB1392767A
GB1392767A GB5123172A GB5123172A GB1392767A GB 1392767 A GB1392767 A GB 1392767A GB 5123172 A GB5123172 A GB 5123172A GB 5123172 A GB5123172 A GB 5123172A GB 1392767 A GB1392767 A GB 1392767A
Authority
GB
United Kingdom
Prior art keywords
circuit
alarm
frequency
intrusion
detection
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
GB5123172A
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.)
Gulf and Western Manufacturing Co
Original Assignee
Gulf and Western 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 Gulf and Western Manufacturing Co filed Critical Gulf and Western Manufacturing Co
Publication of GB1392767A publication Critical patent/GB1392767A/en
Expired 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S367/00—Communications, electrical: acoustic wave systems and devices
    • Y10S367/901—Noise or unwanted signal reduction in nonseismic receiving system

Abstract

1392767 Intruder alarms GULF & WESTERN MFG CO (SYSTEMS) 7 Nov 1972 [7 Dec 1971] 51231/72 Heading G4N An ultrasonic intruder detection system comprises a transmitter 10 and a receiver 14 for establishing a standing wave pattern, detector 20 for detecting a doppler signal representing motion within the protected area, first and second frequency responsive circuits 25, 26 each including integrating circuits and coupled to the detector 20 for producing frequency dependent threshold and detection signals respectively, a difference circuit 27 responsive to the detection signal exceeding the threshold signal for actuating alarm circuitry 30, 33. In the event of an intrusion, a capacitor in the alarm circuitry including an accumulator 33 and an AND gate 32 charges up and an alarm is given after a first predetermined period. The system also includes a third frequency responsive circuit 28 which passes any high frequency background or jamming signals having more than 50% duty ratio and the capacitor charges up slowly via line 31B and if the high frequency signal persists after a second predetermined period, an alarm is given. The circuit 25 is a notch filter sensitive to disturbance signals on either side of the intrusion band while the circuit 26 is a band-pass filter having a high gain over the intrusion band so that spurious signals are discriminated against and movement due to an intruder alone actuates the alarm. Fig. 2 (not shown), is a detailed circuit of Fig. 1, and Fig. 3 (not shown), relates to an alternative embodiment in which a receiver transducer tuned approximately to the carrier frequency is used in place of the circuit 28 for detection of noise components near the carrier frequency.
GB5123172A 1971-12-07 1972-11-07 Ultrasonic alarm circuit Expired GB1392767A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00205599A US3801977A (en) 1971-12-07 1971-12-07 Ultrasonic alarm circuit

Publications (1)

Publication Number Publication Date
GB1392767A true GB1392767A (en) 1975-04-30

Family

ID=22762856

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5123172A Expired GB1392767A (en) 1971-12-07 1972-11-07 Ultrasonic alarm circuit

Country Status (4)

Country Link
US (1) US3801977A (en)
JP (1) JPS4866396A (en)
DE (1) DE2258043A1 (en)
GB (1) GB1392767A (en)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL161904C (en) * 1973-04-13 Knogo Corp THEFT DETECTION SYSTEM.
CH556070A (en) * 1973-06-25 1974-11-15 Cerberus Ag ROOM PROTECTION SYSTEM WITH AT LEAST ONE ULTRASONIC TRANSMITTER AND AT LEAST ONE ULTRASOUND RECEIVER.
CH557068A (en) * 1973-07-10 1974-12-13 Cerberus Ag METHOD AND DEVICE FOR MONITORING AT LEAST ONE CONDUCTIVE MEDIUM.
JPS52127799A (en) * 1976-04-19 1977-10-26 Nippon Prosensor Crime preventing device signal processor circuit
US4097853A (en) * 1976-09-20 1978-06-27 Milwaukee Resistor Corporation Means for distinguishing motion from noise in an intrusion alarm system
US4129856A (en) * 1976-11-15 1978-12-12 Contronic Controls Limited Filter system and method for intrusion alarm
JPS53113088U (en) * 1977-02-17 1978-09-08
US4321586A (en) * 1980-08-21 1982-03-23 Knogo Corporation Article theft detection
JPS58211295A (en) * 1982-06-02 1983-12-08 ニコ−電子株式会社 Malfunctioning prevention for hot wire alarm
US5637098A (en) * 1995-08-07 1997-06-10 Venetec International, Inc. Catheter securement device
US5856778A (en) * 1996-02-29 1999-01-05 Denso Corporation Intrusion detecting apparatus for a vehicle
DE19749991C1 (en) * 1997-11-12 1999-08-26 Janus motion detector
JP5539964B2 (en) * 2008-04-30 2014-07-02 エコラボ インコーポレイティド Effective medical institution cleaning and disinfection
US8639527B2 (en) 2008-04-30 2014-01-28 Ecolab Usa Inc. Validated healthcare cleaning and sanitizing practices
EP2422313A4 (en) * 2009-04-24 2014-08-06 Ecolab Usa Inc Management of cleaning processes via monitoring of chemical product usage
US8004451B2 (en) * 2009-05-27 2011-08-23 Honeywell International Inc. Adaptive microwave security sensor
USRE48951E1 (en) 2015-08-05 2022-03-01 Ecolab Usa Inc. Hand hygiene compliance monitoring
PL2860716T3 (en) * 2009-06-12 2017-10-31 Ecolab Usa Inc Hand hygiene compliance monitoring
US20140210620A1 (en) 2013-01-25 2014-07-31 Ultraclenz Llc Wireless communication for dispenser beacons
AU2018231071B2 (en) 2017-03-07 2022-07-07 Ecolab Usa Inc. Monitoring modules for hand hygiene dispensers
US10529219B2 (en) 2017-11-10 2020-01-07 Ecolab Usa Inc. Hand hygiene compliance monitoring
US10928502B2 (en) * 2018-05-30 2021-02-23 Richwave Technology Corp. Methods and apparatus for detecting presence of an object in an environment
CA3123862A1 (en) 2018-12-20 2020-06-25 Ecolab Usa Inc. Adaptive route, bi-directional network communication

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2794974A (en) * 1955-01-24 1957-06-04 Kidde & Co Walter Compensation for turbulence and other efects in intruder detection systems

Also Published As

Publication number Publication date
JPS4866396A (en) 1973-09-11
DE2258043A1 (en) 1973-06-14
US3801977A (en) 1974-04-02

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees