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ATE25885T1 - CIRCUIT ARRANGEMENT FOR INTERFERENCE SIGNAL SUPPRESSION IN OPTICAL SMOKE DETECTORS. - Google Patents

CIRCUIT ARRANGEMENT FOR INTERFERENCE SIGNAL SUPPRESSION IN OPTICAL SMOKE DETECTORS.

Info

Publication number
ATE25885T1
ATE25885T1 AT84103961T AT84103961T ATE25885T1 AT E25885 T1 ATE25885 T1 AT E25885T1 AT 84103961 T AT84103961 T AT 84103961T AT 84103961 T AT84103961 T AT 84103961T AT E25885 T1 ATE25885 T1 AT E25885T1
Authority
AT
Austria
Prior art keywords
alarm
measured value
diode
led
interrogation
Prior art date
Application number
AT84103961T
Other languages
German (de)
Inventor
Karsten Dipl-Ing Poulsen
Peer Dr-Ing Thilo
Original Assignee
Siemens 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 Siemens Ag filed Critical Siemens Ag
Application granted granted Critical
Publication of ATE25885T1 publication Critical patent/ATE25885T1/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/20—Calibration, including self-calibrating arrangements
    • G08B29/24—Self-calibration, e.g. compensating for environmental drift or ageing of components
    • 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B26/00—Alarm systems in which substations are interrogated in succession by a central station
    • G08B26/005—Alarm systems in which substations are interrogated in succession by a central station with substations connected in series, e.g. cascade

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

1. A circuit arrangement in a fire alarm system, for suppressing interference signals in optical smoke detectors (RM) with a luminescence diode (LED) which transmits in pulsed fashion and with a photo-diode (FD) which receives diffused light from the luminescence diode (LED), where, during cyclic interrogation from central control (Z), the individual alarms (Mi) of an alarm line (ML) are connected in cascade to the alarm line (ML) in a predetermined sequence with a time delay and where the delay time until the connection of the following alarm corresponds to the analogue alarm measured value in question, and in the central control the alarm measured value and the alarm address are determined from the time of the connection, characterised in that the optical smoke detector (RM) comprises a voltage supply device (SPV) ; a transmitting circuit (MMV1) driven by the alarm interrogation (UAB) and serves to produce transmitted pulses (US) for the luminescence diode (LED), where the duration (TP) of the transmitted pulses is substantially shorter than the interrogation duration of an alarm ; an instantaneous value store (SHS), connected to the output of the photo-diode (FD) via the amplifier (VER), driven by the transmitting circuit (MMV1) to temporarily store the analogue alarm measured value ; and a voltage/time converter (VTC) connected to the output of the instantaneous value store, which connects the following alarm (Mi) to the alarm line (ML) via a switch-through transistor (TR) with a delay in accordance with the alarm measured value.
AT84103961T 1983-04-12 1984-04-09 CIRCUIT ARRANGEMENT FOR INTERFERENCE SIGNAL SUPPRESSION IN OPTICAL SMOKE DETECTORS. ATE25885T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833313137 DE3313137A1 (en) 1983-04-12 1983-04-12 CIRCUIT ARRANGEMENT FOR CANCELING NOISE IN OPTICAL SMOKE DETECTORS
EP84103961A EP0125485B1 (en) 1983-04-12 1984-04-09 Signal suppression circuit for optical smoke detectors

Publications (1)

Publication Number Publication Date
ATE25885T1 true ATE25885T1 (en) 1987-03-15

Family

ID=6196107

Family Applications (1)

Application Number Title Priority Date Filing Date
AT84103961T ATE25885T1 (en) 1983-04-12 1984-04-09 CIRCUIT ARRANGEMENT FOR INTERFERENCE SIGNAL SUPPRESSION IN OPTICAL SMOKE DETECTORS.

Country Status (3)

Country Link
EP (1) EP0125485B1 (en)
AT (1) ATE25885T1 (en)
DE (2) DE3313137A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3671120D1 (en) * 1985-07-29 1990-06-13 Siemens Ag METHOD AND DEVICE FOR THE OPERATIONAL MONITORING OF OPTICAL SMOKE DETECTORS.
ATE101445T1 (en) * 1988-10-06 1994-02-15 Siemens Ag PROCEDURE FOR ENERGY-SAVING OPERATION OF SECURITY DETECTORS IN A SECURITY DETECTION SYSTEM.
EP0362797B2 (en) * 1988-10-06 2000-05-17 Siemens Aktiengesellschaft Method for the energy-saving operation of risk detectors in a risk detection arrangement
DE58908329D1 (en) * 1989-09-19 1994-10-13 Siemens Ag Method and device for compensating for air humidity in an optical smoke detector.
ES2049787T3 (en) * 1989-09-19 1994-05-01 Siemens Ag INSTALLATION OF FIRE NOTICE WITH A COMBINED NOTICE.
EP3457369B1 (en) 2017-09-19 2021-05-19 Elmos Semiconductor SE Circuit arrangement for a smoke sensor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2214189B1 (en) * 1973-01-16 1977-07-22 Silec Liaisons Elec
DE2533382C2 (en) * 1975-07-25 1980-07-03 Siemens Ag, 1000 Berlin Und 8000 Muenchen Method and device for the transmission of measured values in a fire alarm system
DE2638068C3 (en) * 1976-08-24 1986-11-13 Siemens AG, 1000 Berlin und 8000 München Fire alarm system with several detectors that can be operated via a message loop
US4149162A (en) * 1977-06-20 1979-04-10 American District Telegraph Company Battery discriminator circuit for smoke detectors

Also Published As

Publication number Publication date
EP0125485B1 (en) 1987-03-11
DE3462637D1 (en) 1987-04-16
DE3313137A1 (en) 1984-10-18
EP0125485A1 (en) 1984-11-21

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Legal Events

Date Code Title Description
REN Ceased due to non-payment of the annual fee