EP0103375A1 - Alarmsystem - Google Patents

Alarmsystem Download PDF

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Publication number
EP0103375A1
EP0103375A1 EP83304173A EP83304173A EP0103375A1 EP 0103375 A1 EP0103375 A1 EP 0103375A1 EP 83304173 A EP83304173 A EP 83304173A EP 83304173 A EP83304173 A EP 83304173A EP 0103375 A1 EP0103375 A1 EP 0103375A1
Authority
EP
European Patent Office
Prior art keywords
radiation
fire
alarm
infra red
movement
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.)
Granted
Application number
EP83304173A
Other languages
English (en)
French (fr)
Other versions
EP0103375B1 (de
Inventor
Allen David Monicell Ltd. Muirhead
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.)
Monicell Ltd
Original Assignee
Monicell 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 Monicell Ltd filed Critical Monicell Ltd
Publication of EP0103375A1 publication Critical patent/EP0103375A1/de
Application granted granted Critical
Publication of EP0103375B1 publication Critical patent/EP0103375B1/de
Expired legal-status Critical Current

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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
    • G08B13/1645—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means and other detection means, e.g. microwave or infrared radiation
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B19/00—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
    • G08B19/005—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow combined burglary and fire alarm systems

Definitions

  • the present invention relates to an alarm system.
  • Alarm systems for detecting unauthorised entry into restricted areas and for detecting fires are now widely used. Increasing concern is however being expressed about the number of false alarms which occur due to activation of the known systems by environmental conditions occurring in normal circumstances.
  • Such systems may comprise an ultrasonic transmitter, an ultrasonic receiver, and a circuit for monitoring the received ultrasonic signal to detect changes of the type which occur when a person moves in the limited area.
  • Such systems rely on Doppler shift techniques and have the advantage that they are difficult to neutralize.
  • the known movement detecting systems are liable to an unacceptable number of false alarms.
  • Passive infra red detectors are also well known for use in both intruder and fire detection systems.
  • infra red intruder detectors short wavelength radiation may be filtered out optically to prevent spurious alarms caused by visible light sources such as flames and sunlight but such filtering obviously cannot be used in infra red fire detectors.
  • spurious alarms can result from radiation emitted by for example heating systems.
  • infra red detector systems have also proved to be prone to numerous false alarms.
  • an alarm system comprising an ultrasonic movement detector, a passive radiation detector responsive to radiation having characteristics associated with radiation emitted by a fire, a fire alarm device, and means for activating the fire alarm device if and only if the detectors detect both movement and radiation having the said characteristics.
  • the ultrasonic movement detector comprises a Doppler shift responsive device and the radiation detector comprises a passive infra red detector.
  • the frequency of amplitude variation in the infra red radiation is a function of its source. Typically this frequency (hereinafter referred to as the flicker frequency) is greater than 10Hz for flames and less than 5Hz for a human body moving at normal speeds. Accordingly by filtering the output of the infra red detector "intruder" or “fire” alarm conditions can be established, and if and only if the ultrasonic detector detects movement an appropriate intruder or fire alarm can be sounded. An integrated fire and intruder alarm system can thus be provided of simple design but high reliability.
  • an ultrasonic beam is emitted into the area to be protected by a transmitter XMTR (Fig. 1) driven by a conventional oscillator circuit comprising a crystal XTAL and gate circuits IC1a and IC1b.
  • Reflected ultrasonic waves are picked up by the receiver RCVR of Fig. 2 and amplified by amplifier IC2a. Any movement in the field of the beam results in a shift in the frequency of the received ultrasonic waves.
  • the lower frequency components (e.g. 1 to 33Hz) resulting from these Doppler shifts are demodulated from the carrier frequency by a network formed by diode D1, capacitor C1 and resistor R1. They are then amplified by amplifiers IC2b and IC2c. The resulting signal is then passed into a diode pump network defined by diodes D2, D3, capacitors C2, C3, and resistor R2.
  • a sufficiently large Doppler shift will result in switching of a comparator IC2d, latching of the comparator in the alarm condition being prevented by capacitor C4.
  • an alarm condition output appears at output OP1 whenever a Doppler shift is detected as a result of a movement occurring in the ultrasonic beam. When the movement ceases, the alarm condition output does not remain indefinitely.
  • a passive infra red detection system is shown which is used both to detect an intruder and to detect fire.
  • An infra red detector Z1 is provided which is sensitive to radiation in the wavelength range 1 to 15 microns. This range covers both infra red radiation emitted by the human body and that emitted by a typical flame.
  • the detector Z1 is positioned to receive radiation emitted in the same area as that covered by the ultrasonic beam.
  • Any radiation of the selected wavelength range is detected by 21 and amplified by amplifier IC3a.
  • the resulting signal is then filtered in order to differentiate between human body emitted radiation with a flicker frequency typically less than 5Hz and flame emitted radiation with a flicker frequency typically greater than 10Hz.
  • a suitable low pass filter IC3b is used as the intruder detector, and a high pass filter IC4b as the fire detector.
  • the signal from IC3b is amplified and rectified by the full-wave rectifier network IC3c and IC3d. A sufficiently large intruder signal will switch a comparator IC4a resulting in an alarm condition signal appearing at output OP2.
  • the signal from high pass filter IC4b is amplified by amplifier IC4c and passed into a diode pump network formed by diodes D4, D5, capacitors C5, C6, and resistor R3. To ensure that momentary spurious signals at this point do not result in an alarm condition, a small delay is provided by the diode pump network. This ensures that a flame must be present for a specific period of time before a comparator IC4d switches and an alarm condition signal appears at output OP3.
  • the infra red intruder output (OP2, Fig. 3) and the ultrasonic output (OP1, Fig. 2) are applied with the output of an on/off control switch SW to a NAND gate IC5.
  • the fire alarm condition output (OP3, Fig. 3) is applied to a NAND gate IC6.
  • the output of gate IC5 is applied to a gate circuit IC7a, and the output of gate IC6 is applied via gates IC8b and c to a gate IC8d.
  • the gate IC8d turns on an oscillator made up of components IC7c and IC7d.
  • a modulator made up of IC7a and IC7b is turned on. The result is an oscillator output which sweeps up and down in frequency, driving speaker SPKR.
  • the flicker frequency of the infra red detector In the case of flames, the flicker frequency is inherent in the condition being monitored. In the case of an intruder, who may be moving slowly, as is well known it is necessary to view the infra red signal in a manner which breaks up the incoming signal. This is done conventionally by viewing the infra red signal via a suitably faceted mirror or a faceted lens which is transparent to the infra red frequency of interest.
  • the detectors may incorporate any appropriate additional circuitry to improve their discrimination.
  • the infra red detector Z1 may be a Mullard type RPY87
  • circuits IC1, IC7 and IC9 may be type 4011
  • circuits IC2, IC3 and IC4 may be type TL084
  • circuits IC5 and IC6 may be type 4023
  • circuits IC7 may be type 4093.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Burglar Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)
EP83304173A 1982-07-22 1983-07-19 Alarmsystem Expired EP0103375B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8221215 1982-07-22
GB8221215 1982-07-22

Publications (2)

Publication Number Publication Date
EP0103375A1 true EP0103375A1 (de) 1984-03-21
EP0103375B1 EP0103375B1 (de) 1987-01-14

Family

ID=10531839

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83304173A Expired EP0103375B1 (de) 1982-07-22 1983-07-19 Alarmsystem

Country Status (3)

Country Link
EP (1) EP0103375B1 (de)
JP (1) JPS5968092A (de)
DE (1) DE3369214D1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0147925A1 (de) * 1983-10-19 1985-07-10 C & K Systems, Inc. Kombinierte Infrarot- und Mikrowelleneinrichtung als Eindringalarmdetektor
WO1986000450A1 (en) * 1984-06-18 1986-01-16 Santa Barbara Research Center Fire sensing and suppression method and system responsive to optical radiation and mechanical wave energy
EP0682330A1 (de) * 1994-05-09 1995-11-15 Matsushita Electric Industrial Co., Ltd. Nachweisvorrichtung und Verfahren zum Messen warmer Objekte
EP0940789A2 (de) * 1998-03-06 1999-09-08 Siemens Aktiengesellschaft Verfahren und Sensor zur Brandmeldung
US6437118B1 (en) 1999-05-26 2002-08-20 Hoffmann-La Roche Inc. Vinylating of pyrimidine derivatives
GB2521200A (en) * 2013-12-13 2015-06-17 Here Global Bv Method apparatus and computer program

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3745550A (en) * 1971-08-02 1973-07-10 Phenos Optical intrusion alarm system
US4052716A (en) * 1976-03-29 1977-10-04 Mortensen Tage A Fire and intruder detection and alarm apparatus
US4100543A (en) * 1977-02-04 1978-07-11 Napco Security Systems, Inc. Audible alarm apparatus particularly adaptable for use with fire and theft security systems
DE2820343A1 (de) * 1977-06-24 1979-01-11 Cerberus Ag Strahlungsdetektor und dessen verwendung
US4321591A (en) * 1980-02-05 1982-03-23 Thomas Vieweg Portable, self-powered multiple warning device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB964752A (en) * 1962-10-26 1964-07-22 American District Telegraph Co Electrical protection system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3745550A (en) * 1971-08-02 1973-07-10 Phenos Optical intrusion alarm system
US4052716A (en) * 1976-03-29 1977-10-04 Mortensen Tage A Fire and intruder detection and alarm apparatus
US4100543A (en) * 1977-02-04 1978-07-11 Napco Security Systems, Inc. Audible alarm apparatus particularly adaptable for use with fire and theft security systems
DE2820343A1 (de) * 1977-06-24 1979-01-11 Cerberus Ag Strahlungsdetektor und dessen verwendung
US4321591A (en) * 1980-02-05 1982-03-23 Thomas Vieweg Portable, self-powered multiple warning device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0147925A1 (de) * 1983-10-19 1985-07-10 C & K Systems, Inc. Kombinierte Infrarot- und Mikrowelleneinrichtung als Eindringalarmdetektor
WO1986000450A1 (en) * 1984-06-18 1986-01-16 Santa Barbara Research Center Fire sensing and suppression method and system responsive to optical radiation and mechanical wave energy
EP0682330A1 (de) * 1994-05-09 1995-11-15 Matsushita Electric Industrial Co., Ltd. Nachweisvorrichtung und Verfahren zum Messen warmer Objekte
US5726449A (en) * 1994-05-09 1998-03-10 Matsushita Electric Industrial Co., Ltd Detecting apparatus and measuring method of warm object
EP0940789A2 (de) * 1998-03-06 1999-09-08 Siemens Aktiengesellschaft Verfahren und Sensor zur Brandmeldung
EP0940789A3 (de) * 1998-03-06 2000-08-16 Siemens Aktiengesellschaft Verfahren und Sensor zur Brandmeldung
US6437118B1 (en) 1999-05-26 2002-08-20 Hoffmann-La Roche Inc. Vinylating of pyrimidine derivatives
GB2521200A (en) * 2013-12-13 2015-06-17 Here Global Bv Method apparatus and computer program
US9552709B2 (en) 2013-12-13 2017-01-24 Here Global B.V. Method apparatus and computer program

Also Published As

Publication number Publication date
JPS5968092A (ja) 1984-04-17
EP0103375B1 (de) 1987-01-14
DE3369214D1 (en) 1987-02-19

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