EP0014779A1 - Détecteur de fumée comportant un circuit d'exploitation d'impulsion - Google Patents

Détecteur de fumée comportant un circuit d'exploitation d'impulsion Download PDF

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Publication number
EP0014779A1
EP0014779A1 EP79200721A EP79200721A EP0014779A1 EP 0014779 A1 EP0014779 A1 EP 0014779A1 EP 79200721 A EP79200721 A EP 79200721A EP 79200721 A EP79200721 A EP 79200721A EP 0014779 A1 EP0014779 A1 EP 0014779A1
Authority
EP
European Patent Office
Prior art keywords
radiation
counter
pulses
smoke detector
output
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
EP79200721A
Other languages
German (de)
English (en)
Other versions
EP0014779B1 (fr
Inventor
Erwin Tresch
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.)
Cerberus AG
Original Assignee
Cerberus 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 Cerberus AG filed Critical Cerberus AG
Priority to AT79200721T priority Critical patent/ATE1207T1/de
Publication of EP0014779A1 publication Critical patent/EP0014779A1/fr
Application granted granted Critical
Publication of EP0014779B1 publication Critical patent/EP0014779B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke

Definitions

  • the invention relates to a smoke detector with a pulsed radiation source, a radiation receiver which is arranged outside the direct radiation region of the radiation source and which is acted upon by scattered radiation in the presence of smoke in the radiation region and emits output signals, and an evaluation circuit which is capable of triggering a signal when radiation pulses of the radiation source and output pulses of the Radiation recipient are in coincidence.
  • Such a smoke detector is known, for example, from US Pat. No. 3,316,410.
  • a radiation source is controlled by a pulse generator and emits short-lasting radiation pulses.
  • the evaluation circuit connected to the scattered radiation receiver is controlled by the pulse generator of the radiation source in such a way that, when scattered radiation is picked up, it can only output an output signal during the pulse phases of the radiation source. Interference pulses that occur between the radiation pulses are therefore blocked in the evaluation circuit and cannot lead to the triggering of a signal.
  • the disadvantage here is that interference pulses which occur accidentally during the same time as the radiation pulses can trigger a faulty signal.
  • Such a smoke detector is less prone to faulty signaling and accordingly shows improved operational reliability, however, if several interference pulses occur in succession, it can still happen that several of these interference pulses coincide with the radiation pulses and still cause a faulty signal.
  • the invention is based on the object of eliminating the disadvantages of known smoke detectors and avoiding faulty signaling as much as possible as a result of the occurrence of interference pulses and thus further improving operational safety, in particular when used as a fire detector.
  • the invention is characterized in that the evaluation circuit has a counting device which counts both the radiation source pulses and the output pulses of the radiation receiver, and resets the counter to zero after any radiation pulse in the event of an odd-numbered counter reading, but triggers a signal when a predetermined even-numbered counter reading is reached .
  • the invention takes advantage of the fact that when smoke is present in the radiation area, each radiation pulse must always correspond to a corresponding output pulse from the radiation receiver. Are now from If the radiation source pulses and the output pulses of the radiation receiver are counted in a counting device, the counter must have an even number after each radiation pulse. An odd-numbered counter reading is an unmistakable sign that there is no receive pulse. In this case, the evaluation circuit is automatically reset to zero so that the counter cannot reach the counter reading required for signaling. The counter is locked when there is no radiation source pulse.
  • the invention is explained with reference to the circuit of an embodiment shown in the figure.
  • the mechanical construction of the R detector can also be carried out in a known manner, for example as described in Swiss Patent No. 592 932.
  • the radiation transmitter consists of a pulse generator 1 of a known type which, for example, produces transmission pulses of 100 pS duration and a pulse interval of one second, which are fed to a power transistor 2.
  • the parallel connection of a load resistor 3 and a light- or infrared-emitting diode 4 is connected in series with a resistor 5 at the transistor output.
  • the diode 4 emits radiation pulses in the rhythm of the pulse generator 1 into the stray volume of the smoke detector.
  • 2 coincidence pulses are output via a line K from the output of the power transistor taken and supplied to the logic correlation circuit L.
  • the radiation receiving part A contains a storage capacitor 13 and a solar cell 6 which, in the presence of smoke in the scattering volume of the detector, receives scattered radiation in the rhythm of the radiation pulses of the diode 4.
  • a load resistor 7 is connected in parallel with the solar cell 6.
  • the output pulses from the solar cell 6 are fed via a capacitor 8 to an amplifier 9, for example an operational amplifier with a degree of amplification 10 3 , the output signals of which are fed to the logic correlation circuit L via a capacitor 11 with an associated bleeder resistor 12 .
  • the received pulses E emitted by the radiation receiving part A are flattened exponentially by a suitable choice of the frequency response of the amplifier and the solar cell 6.
  • the logic correlation circuit L contains two AND gates 14 and 15 and an OR gate 16.
  • the first AND gate 14 is supplied with the incidence pulses K of the radiation transmitter S at its first input, while the other AND gate 15 receives the receive pulses at one input of the radiation receiving part A receives.
  • the output of this AND gate 15 is led to an input of the OR gate 16, the other input of which also receives the coincidence pulses K.
  • the output of the OR gate 16 is connected to the counter input C of the binary counter B. Both the received pulses E and the coincidence pulses K are therefore counted by the counter B, interference from both types of pulse being avoided by the flattened shape of the E pulse.
  • the counter can be of the type Motorola MC14024, for example.
  • Counter B has various outputs for the individual digits of the binary counter reading, for example an output Q 0 for the first bit or the final digit and an output Q n for the nth or nth digit of the binary number.
  • the exit Q 0 is now connected to the other two inputs of the two AND gates 14 and 15, while the output of the AND gate 14 is connected to a reset input of the binary counter B, so that the counter status is reset to zero as soon as at the output of the AND -Tores 14 a signal occurs.
  • the output Q 0 is connected to the line L 1 via a delay capacitor 17.
  • This circuit has the effect that, without the presence of smoke in the scatter volume of the detector, i.e. if there is no receive pulse E via OR gate 16 at the counter input C of counter B, only one coincidence pulse is counted at the start of each transmit pulse. Signal 1 is therefore present at output Q 0 . Immediately after the coincidence pulse has elapsed, a signal is produced at the output of the AND gate 14, so that the counter B is reset to zero via a reset input R. In the absence of stray radiation, ie in the absence of receive pulses, counter B does not count further.
  • the control electrode of a thyristor 19 is connected to the n.
  • Output Q of the counter B via a resistor 18, which is connected in series with a resistor 20 and a display device 21, for example a light-emitting diode, between the lines L I and L 2 .
  • a resistor 18 which is connected in series with a resistor 20 and a display device 21, for example a light-emitting diode, between the lines L I and L 2 .
  • the thyristor 19 is switched through and an alarm current flows, which actuates the display device 21 and thus the presence of Smoke signals.
  • an alarm current also flows from the connecting terminals of the detector to the center, which can also be evaluated there for signaling in a known manner.
  • logic correlation circuit L can also be designed as an integrated circuit with the same function.
  • the circuit described thus achieves the advantage that an alarm signal can only be triggered if both a coincidence pulse taken from the radiation transmitter and a receive pulse supplied by the radiation receiver arrive at the same time or within a short delay time and when such correlated receive pulses occur a predetermined number of times occur following.
  • a coincidence pulse taken from the radiation transmitter and a receive pulse supplied by the radiation receiver arrive at the same time or within a short delay time and when such correlated receive pulses occur a predetermined number of times occur following.
  • the signaling is automatically blocked. This correlated multi-pulse dependency therefore significantly improves the immunity to interference.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Vehicle Body Suspensions (AREA)
EP79200721A 1979-02-22 1979-12-04 Détecteur de fumée comportant un circuit d'exploitation d'impulsion Expired EP0014779B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79200721T ATE1207T1 (de) 1979-02-22 1979-12-04 Rauchdetektor mit impuls-auswerteschaltung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH177379A CH638331A5 (de) 1979-02-22 1979-02-22 Rauchdetektor.
CH1773/79 1979-02-22

Publications (2)

Publication Number Publication Date
EP0014779A1 true EP0014779A1 (fr) 1980-09-03
EP0014779B1 EP0014779B1 (fr) 1982-06-16

Family

ID=4218261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79200721A Expired EP0014779B1 (fr) 1979-02-22 1979-12-04 Détecteur de fumée comportant un circuit d'exploitation d'impulsion

Country Status (10)

Country Link
US (1) US4321595A (fr)
EP (1) EP0014779B1 (fr)
JP (1) JPS55114938A (fr)
AT (1) ATE1207T1 (fr)
AU (1) AU528534B2 (fr)
CA (1) CA1129034A (fr)
CH (1) CH638331A5 (fr)
DE (1) DE2963129D1 (fr)
DK (1) DK149726C (fr)
NO (1) NO147619C (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079010A1 (fr) * 1981-11-11 1983-05-18 Cerberus Ag Détecteur de fumée
WO1984002790A1 (fr) * 1983-01-11 1984-07-19 Cerberus Ag Detecteur de fumee photoelectrique et son utilisation
EP0067313B1 (fr) * 1981-06-15 1985-08-28 Cerberus Ag Détecteur de fumée comportant une source de rayonnement commandée par impulsions
GB2214682A (en) * 1988-01-21 1989-09-06 Huang Ding Li Smoke warning apparatus

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609216A (en) * 1947-06-06 1952-09-02 Eric M Mcelhinney Sharp turn steering apparatus for vehicles
DE943797C (de) * 1950-02-26 1956-06-01 Hermann E Mueller K G Dr Motorisiertes Fahrzeug zur Ausfuehrung insbesondere landwirtschaftlicher Arbeiten
US5019805A (en) * 1989-02-03 1991-05-28 Flash-Alert Inc. Smoke detector with strobed visual alarm and remote alarm coupling
AU652513B2 (en) * 1992-06-29 1994-08-25 Nohmi Bosai Ltd Smoke detecting apparatus for fire alarm
UA78855C2 (en) * 2005-04-05 2007-04-25 Private Entpr Arton Smoke detector
CN102426751B (zh) * 2011-08-26 2013-07-17 无锡蓝天电子有限公司 点型光电感烟火灾探测器
WO2018089660A1 (fr) * 2016-11-11 2018-05-17 Carrier Corporation Détection à base de fibres optiques à haute sensibilité
EP3539104B1 (fr) 2016-11-11 2022-06-08 Carrier Corporation Détection basée sur des fibres optiques haute sensibilité
CN109937438B (zh) 2016-11-11 2021-11-05 开利公司 基于高灵敏度光纤的检测
ES2968291T3 (es) 2016-11-11 2024-05-08 Carrier Corp Detección basada en fibra óptica de alta sensibilidad
US11127270B2 (en) 2016-11-11 2021-09-21 Carrier Corporation High sensitivity fiber optic based detection

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2254024A1 (fr) * 1973-11-26 1975-07-04 Pyrotector Inc
DE2909810A1 (de) * 1978-03-13 1979-09-27 American District Telegraph Co Riegelarm-rauchdetektor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH417405A (de) * 1964-07-14 1966-07-15 Cerberus Ag Werk Fuer Elektron Vorrichtung zur Feststellung von Aerosolen in Luft
US3946241A (en) * 1973-11-26 1976-03-23 Pyrotector, Incorporated Light detector with pulsed light source and synchronous data gating

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2254024A1 (fr) * 1973-11-26 1975-07-04 Pyrotector Inc
DE2909810A1 (de) * 1978-03-13 1979-09-27 American District Telegraph Co Riegelarm-rauchdetektor
GB2017994A (en) * 1978-03-13 1979-10-10 American District Telegraph Co Electrical apparatus for detecting an alarm condition eg optical smoke detectors
FR2420173A1 (fr) * 1978-03-13 1979-10-12 American District Telegraph Co Dispositif de detection d'une condition d'alarme

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0067313B1 (fr) * 1981-06-15 1985-08-28 Cerberus Ag Détecteur de fumée comportant une source de rayonnement commandée par impulsions
EP0079010A1 (fr) * 1981-11-11 1983-05-18 Cerberus Ag Détecteur de fumée
US4555634A (en) * 1981-11-11 1985-11-26 Cerberus Ag Optical smoke detector with contamination detection circuitry
WO1984002790A1 (fr) * 1983-01-11 1984-07-19 Cerberus Ag Detecteur de fumee photoelectrique et son utilisation
GB2214682A (en) * 1988-01-21 1989-09-06 Huang Ding Li Smoke warning apparatus

Also Published As

Publication number Publication date
ATE1207T1 (de) 1982-07-15
DK64380A (da) 1980-08-23
CH638331A5 (de) 1983-09-15
DK149726C (da) 1987-04-13
NO794342L (no) 1980-08-25
DE2963129D1 (en) 1982-08-05
AU528534B2 (en) 1983-05-05
CA1129034A (fr) 1982-08-03
EP0014779B1 (fr) 1982-06-16
JPS55114938A (en) 1980-09-04
JPS6327653B2 (fr) 1988-06-03
DK149726B (da) 1986-09-15
NO147619B (no) 1983-01-31
AU5471580A (en) 1980-08-28
US4321595A (en) 1982-03-23
NO147619C (no) 1983-05-18

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