EP0014779B1 - Rauchdetektor mit Impuls-Auswerteschaltung - Google Patents

Rauchdetektor mit Impuls-Auswerteschaltung Download PDF

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Publication number
EP0014779B1
EP0014779B1 EP79200721A EP79200721A EP0014779B1 EP 0014779 B1 EP0014779 B1 EP 0014779B1 EP 79200721 A EP79200721 A EP 79200721A EP 79200721 A EP79200721 A EP 79200721A EP 0014779 B1 EP0014779 B1 EP 0014779B1
Authority
EP
European Patent Office
Prior art keywords
counter
radiation
pulses
output
smoke detector
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
EP79200721A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0014779A1 (de
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/de
Application granted granted Critical
Publication of EP0014779B1 publication Critical patent/EP0014779B1/de
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 arranged outside the direct radiation area of the radiation source, which is exposed to scattered radiation in the presence of smoke in the radiation area 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 receiver are in coincidence, and which has a counting device.
  • a smoke detector operating in this way with triggering at pulse coincidence 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, but it can still happen when several interference pulses occur in succession that several of these interference pulses coincide with the radiation pulses and still cause an incorrect signal.
  • the invention is based on the object of eliminating the disadvantages of prior art smoke detectors and avoiding faulty signaling as much as possible due to 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 counting device counts both the radiation source pulses and the output pulses of the radiation receiver and, in the case of an odd-numbered counter reading, resets the counter to zero after any radiation pulse, 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. If both the radiation source pulses and the output pulses of the radiation receiver are counted by 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 exemplary embodiment shown in the figure.
  • the mechanical construction of the smoke detector can be carried out in a known manner, for example as described in Swiss Patent No. 592 932.
  • a radiation transmitter S, a radiation detector A and a logic correlation circuit L connected to a binary counter B with a downstream switching stage lie between two lines L and L 2 carrying direct voltage.
  • the radiation transmitter consists of a pulse generator 1 of a known type which, for example, produces transmission pulses of 10 °! 1s duration and a pulse interval of one second, which are supplied 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 taken from the output of the power transistor via a line K and fed to the logic correlation circuit L.
  • the radiation receiving part A contains a storage capacitor 13 and a solar cell 6, which receives stray radiation in the presence of smoke in the stray volume of the detector in the rhythm of the stray 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 by a suitable choice the frequency response of amplifier and solar cell 6 flattened exponentially.
  • 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 coincidence 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 0 0 for the first bit or the final digit and an output Q n for the nth bit or the nth digit of the binary number.
  • the output 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 R of the binary counter B, so that the counter status is reset to zero as soon as Output of the AND gate 14, a signal occurs.
  • the output Q 0 is connected to the power L via a delay capacitor 17.
  • This circuit ensures that without the presence of smoke in the scattering volume of the detector, i.e. if the receive pulses E are not sent via the OR gate 16 to the counter input C of the counter B, only one coincidence pulse is counted at the start of each transmit pulse. A signal 1 is therefore present at output 0 0 . Immediately after the coincidence pulse has elapsed, a signal is generated at the output of the AND gate 14, so that the counter B is reset to zero via the reset input R. In the absence of stray radiation, ie in the absence of receive pulses, counter B does not count further.
  • a coincidence pulse K arrives and a receive pulse E arrives after a short delay
  • a count pulse K reaches the count input C directly via the OR gate 16 and delays a receive pulse E via the AND gate 15 and the OR gate 16 has the consequence that at the end of the coincidence pulse, the counter reading is an even number, that is to say the end digit zero is present at output 0 0 , as a result of which AND gate 14 is blocked and reset input R receives no signal.
  • the counter therefore continues to count, the counter reading being always an even number, that is to say the signal zero occurs at the output 0 0 if a coincidence pulse and a reception pulse that have come together have arrived. For the duration of the transmit pulse, only a maximum of one receive pulse can be read into the counter for the coincidence pulse.
  • the control electrode of a thyristor 19 is connected to the nth 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 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 and L 2 .
  • 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 Rauchdetektor mit Impuls-Auswerteschaltung Expired EP0014779B1 (de)

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 EP0014779A1 (de) 1980-09-03
EP0014779B1 true EP0014779B1 (de) 1982-06-16

Family

ID=4218261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79200721A Expired EP0014779B1 (de) 1979-02-22 1979-12-04 Rauchdetektor mit Impuls-Auswerteschaltung

Country Status (10)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102426751A (zh) * 2011-08-26 2012-04-25 无锡蓝天电子有限公司 点型光电感烟火灾探测器

Families Citing this family (15)

* 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
CH657221A5 (de) * 1981-06-15 1986-08-15 Cerberus Ag Rauchdetektor.
CH655396B (enrdf_load_stackoverflow) * 1981-11-11 1986-04-15
CH660244A5 (de) * 1983-01-11 1987-03-31 Cerberus Ag Photoelektrischer rauchdetektor und dessen verwendung.
DE8800651U1 (de) * 1988-01-21 1988-08-25 Huang, Ding-Li, Sun-Chung, Taipei Warnvorrichtung mit einer Einrichtung zur Aufforderung, das Rauchen zu unterlassen
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
RU2125739C1 (ru) * 1997-12-22 1999-01-27 Шубин Владимир Владимирович Детектор дыма
UA78855C2 (en) * 2005-04-05 2007-04-25 Private Entpr Arton Smoke detector
CN109964259B (zh) 2016-11-11 2022-03-25 开利公司 基于高灵敏度光纤的检测
US11132883B2 (en) 2016-11-11 2021-09-28 Carrier Corporation High sensitivity fiber optic based detection
WO2018089668A2 (en) 2016-11-11 2018-05-17 Carrier Corporation High sensitivity fiber optic based detection
ES2987990T3 (es) * 2016-11-11 2024-11-18 Carrier Corp Detección basada en fibra óptica de alta sensibilidad
ES2919300T3 (es) 2016-11-11 2022-07-22 Carrier Corp Detección basada en fibra óptica de alta sensibilidad

Family Cites Families (4)

* 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
IL45331A (en) * 1973-11-26 1977-12-30 Chloride Batterijen Bv Photoelectric smoke detector
US4193069A (en) * 1978-03-13 1980-03-11 American District Telegraph Company Latching alarm smoke detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102426751A (zh) * 2011-08-26 2012-04-25 无锡蓝天电子有限公司 点型光电感烟火灾探测器
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

Also Published As

Publication number Publication date
AU528534B2 (en) 1983-05-05
DK149726B (da) 1986-09-15
NO147619C (no) 1983-05-18
NO147619B (no) 1983-01-31
EP0014779A1 (de) 1980-09-03
AU5471580A (en) 1980-08-28
CH638331A5 (de) 1983-09-15
JPS55114938A (en) 1980-09-04
US4321595A (en) 1982-03-23
DK64380A (da) 1980-08-23
CA1129034A (en) 1982-08-03
DK149726C (da) 1987-04-13
DE2963129D1 (en) 1982-08-05
NO794342L (no) 1980-08-25
JPS6327653B2 (enrdf_load_stackoverflow) 1988-06-03
ATE1207T1 (de) 1982-07-15

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