FR2385097A1 - Detecteur de fumee - Google Patents

Detecteur de fumee

Info

Publication number
FR2385097A1
FR2385097A1 FR7736013A FR7736013A FR2385097A1 FR 2385097 A1 FR2385097 A1 FR 2385097A1 FR 7736013 A FR7736013 A FR 7736013A FR 7736013 A FR7736013 A FR 7736013A FR 2385097 A1 FR2385097 A1 FR 2385097A1
Authority
FR
France
Prior art keywords
terminal
chamber
network
amplifier
common
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.)
Pending
Application number
FR7736013A
Other languages
English (en)
Inventor
William Peil
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.)
General Electric Co
Original Assignee
General Electric 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 General Electric Co filed Critical General Electric Co
Publication of FR2385097A1 publication Critical patent/FR2385097A1/fr
Pending legal-status Critical Current

Links

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
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

Détecteur à cellule à ionisation dont les variations d'impédance d'entrée du réseau de mesure n'affectent pas la précision. Il comprend une chambre de détection de fumée à ionisation 10, un circuit de détection pour détecter la variation d'impédance de la chambre et comprenant une source de tension alternative dont une première borne est reliée à une première borne 18 de la chambre et la seconde borne à une borne commune du réseau, B** +, un amplificateur de courant Q1 , Q5 , Q2 , Q4 dont la borne d'entrée est reliée à la seconde borne 19 de la chambre, la borne commune à la borne commune du réseau, cet amplificateur possédant une charge reliée entre sa borne de sortie et sa borne commune et un dispositif sensible à la tension Q11 , Q 15 , Q17 , D2 , D3 , 25 relié à la borne de sortie de l'amplificateur. Application à la détection de fumées.
FR7736013A 1976-12-01 1977-11-30 Detecteur de fumee Pending FR2385097A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/746,293 US4118689A (en) 1976-12-01 1976-12-01 Smoke detector

Publications (1)

Publication Number Publication Date
FR2385097A1 true FR2385097A1 (fr) 1978-10-20

Family

ID=25000230

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7736013A Pending FR2385097A1 (fr) 1976-12-01 1977-11-30 Detecteur de fumee

Country Status (7)

Country Link
US (1) US4118689A (fr)
JP (1) JPS5392192A (fr)
BE (1) BE861387A (fr)
CA (1) CA1095638A (fr)
DE (1) DE2753324A1 (fr)
FR (1) FR2385097A1 (fr)
NL (1) NL7713337A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2403685A1 (fr) * 1977-09-19 1979-04-13 Rca Corp Amplificateur a limiteur de courant

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6177961B1 (en) * 1996-02-14 2001-01-23 Thomson Licensing S.A. Television system with display of VCR mode
US8415638B2 (en) * 2010-08-06 2013-04-09 Thermo Fisher Scientific Inc. Method for detecting high-energy radiation using low voltage optimized ion chamber
WO2015187249A1 (fr) * 2014-06-03 2015-12-10 Carrier Corporation Filtres à air ioniseur pour la détection de particules dangereuses
US10488365B2 (en) * 2015-06-17 2019-11-26 Qualcomm Incorporated Current sensors using bipolar transistors

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3516083A (en) * 1965-12-02 1970-06-02 Denske Securitas As Electric alarm system,preferably for a fire alarm
US3728703A (en) * 1970-10-12 1973-04-17 Edward Co Inc Fire detector stabilizer circuit
US3798625A (en) * 1970-08-13 1974-03-19 Sci Systems Inc Rate-of-change combustion and combination detection apparatus
US4023152A (en) * 1973-10-01 1977-05-10 Matsushita Electric Works, Ltd. Ionization type smoke sensing device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3516083A (en) * 1965-12-02 1970-06-02 Denske Securitas As Electric alarm system,preferably for a fire alarm
US3798625A (en) * 1970-08-13 1974-03-19 Sci Systems Inc Rate-of-change combustion and combination detection apparatus
US3728703A (en) * 1970-10-12 1973-04-17 Edward Co Inc Fire detector stabilizer circuit
US4023152A (en) * 1973-10-01 1977-05-10 Matsushita Electric Works, Ltd. Ionization type smoke sensing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2403685A1 (fr) * 1977-09-19 1979-04-13 Rca Corp Amplificateur a limiteur de courant

Also Published As

Publication number Publication date
NL7713337A (nl) 1978-06-05
BE861387A (fr) 1978-03-31
CA1095638A (fr) 1981-02-10
JPS5392192A (en) 1978-08-12
US4118689A (en) 1978-10-03
DE2753324A1 (de) 1978-06-08

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