EP0113046A2 - Détecteur de chaleur - Google Patents

Détecteur de chaleur Download PDF

Info

Publication number
EP0113046A2
EP0113046A2 EP83111869A EP83111869A EP0113046A2 EP 0113046 A2 EP0113046 A2 EP 0113046A2 EP 83111869 A EP83111869 A EP 83111869A EP 83111869 A EP83111869 A EP 83111869A EP 0113046 A2 EP0113046 A2 EP 0113046A2
Authority
EP
European Patent Office
Prior art keywords
light emitting
optical fiber
light
fire
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
EP83111869A
Other languages
German (de)
English (en)
Other versions
EP0113046B1 (fr
EP0113046A3 (en
Inventor
Toshiaki Nohmi Bosai Kogyo Co. Ltd. Okazaki
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.)
Nohmi Bosai Ltd
Original Assignee
Nohmi Bosai Kogyo Co 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 Nohmi Bosai Kogyo Co Ltd filed Critical Nohmi Bosai Kogyo Co Ltd
Publication of EP0113046A2 publication Critical patent/EP0113046A2/fr
Publication of EP0113046A3 publication Critical patent/EP0113046A3/en
Application granted granted Critical
Publication of EP0113046B1 publication Critical patent/EP0113046B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
    • 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

Definitions

  • This idea relates to a heat detector using an optical fiber as heat sensing wire.
  • these heat detectors use an optical fiber which is composed of only a plastic core fusing at a low temperature (some 60 300° C ), an optical fiber with its core and clad layer made of plastic fusing at a low temperature, or an optical fiber with its core made of quartz glass which does not fuse at a low temperature and its clad layer made of plastic fusing at a low temperature.
  • the ones composed of the plastic core alone or the core and clad layer, both being made of plastic fuse and open with heat from or flame of fire while in the case of the one composed of the quartz glass core and the plastic clad layer, only the clad layer fuses and the core does not open.
  • optical fibers have an open or partial fusion caused by heat or flame in case of fire, all or part of the light from the light source leaks out through the damaged portion, and consequently the photoelectric element receives no light or only a part of the light from the light source.
  • the photoelectric element receives the environmental lights and the light from flame entering through the damaged portion in lieu of the light from the light source, and accordingly there is scarecely any change in light intensity reaching the photoelectric element before and after the optical fiber is damaged, and it was quite difficult to discriminate the fire.
  • the present idea aims at offering a heat detector which uses an optical fiber as heat sensing wire and is capable of readily discriminating a fire by detecting, without fail, such decrease of light from the light source as caused by damage in the optical fiber in case of fire.
  • 1 is an optical fiber with its core and clad layer made of plastics having different refraction rates and which fuses at a low temperature (some 60 300°C)
  • 2 is a light emitting element such as a light emitting diode provided at one end of optical fiber
  • 3 is a light emitting current feed circuit to feed light emitting current to light emitting element
  • 4 is a modulation circuit to modulate the light emitting current from light emitting current feed circuit 3 by signal with specific frequency f from oscillator 5 and to feed the modulated light to light emitting element
  • 6 is a photoelectric element such as solar cell provided at the other end of optical fiber
  • 7 is an amplifier to amplify the output of photoelectric element
  • 8 is a bandpass filter through which only the output modulated by specific frequency f out of the amplified output from amplifier 7 can pass
  • 9 is a fire discriminating circuit comprising a comparator which gives out a fire signal when the output through the bandpass filter has fallen below the
  • the heat detector of this composition operates as follows.
  • the light emitting current from light emitting current feed circuit 3 is normally modulated by modulation circuit 4 and fed to light emitting element 2. With this modulated light emitting current, light emitting element 2 emits modulated light to optical fiber 1.
  • photoelectric element 6 receives the modulated light from light emitting element 2 through optical fiber 1.
  • the output of photoelectric element 6 is amplified by amplifier 7, and then fed to fire discriminating circuit 9 through bandpass filter 8. Fire discriminating circuit 9 does not give out a fire signal as long as the modulated light output is above the predetermined level.
  • the light emitting current from light emitting current feed circuit 3 is made as pulse output, to modulate the light emitting current pulse by output of oscillator 5 in modulation circuit 4 and to feed the modulated light emitting current pulse to light emitting element 2.
  • operation of amplifier 7 or fire discriminating circuit 9 is synchronized with light emitting current output of light emitting current feed circuit 3.
  • an optical fiber which is composed of only plastic core fusing at a low temperature or an optical fiber with its core made of quartz glass which does not fuse at a low temperature and its clad layer made of plastic fusing at a low temperature.
  • occurence of a fire is discriminated by emitting modulated light to the optical fiber from the light emitting element and checking if there is attenuation in the modulated light intensity reaching the photoelectric element. Therefore, it offers a heat detector using an optical fiber as heat sensing wire which is capable of readily discriminating fire by detecting, without fail, such attenuation of light from the light source as caused by damage in the optical fiber in case of fire.
  • the drawing is a schematic diagram of an embodiment of the heat detector according to this idea.

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Light Guides In General And Applications Therefor (AREA)
EP19830111869 1982-12-03 1983-11-26 Détecteur de chaleur Expired EP0113046B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP182610/82 1982-12-03
JP18261082U JPS5988793U (ja) 1982-12-03 1982-12-03 熱式火災感知器

Publications (3)

Publication Number Publication Date
EP0113046A2 true EP0113046A2 (fr) 1984-07-11
EP0113046A3 EP0113046A3 (en) 1984-12-05
EP0113046B1 EP0113046B1 (fr) 1987-09-16

Family

ID=16121297

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830111869 Expired EP0113046B1 (fr) 1982-12-03 1983-11-26 Détecteur de chaleur

Country Status (4)

Country Link
EP (1) EP0113046B1 (fr)
JP (1) JPS5988793U (fr)
DE (1) DE3373736D1 (fr)
ES (1) ES528187A0 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2203832A (en) * 1987-04-16 1988-10-26 Graviner Ltd Overheat detection
US7115692B2 (en) 2000-12-20 2006-10-03 Coatex S.A.S. Grinding and/or for dispersing aid of mineral materials in aqueous suspension, resulting aqueous suspensions and uses thereof
CN116343426A (zh) * 2023-03-20 2023-06-27 享成安全科技(南京)有限公司 一种带位置指示的缆式线型感温火灾探测器及其使用方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2512312A1 (de) * 1974-03-20 1975-10-09 Sumitomo Electric Industries Lichtleiterfaser
GB2060871A (en) * 1979-08-15 1981-05-07 Perren B Self monitoring warning installation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5070890U (fr) * 1973-10-31 1975-06-23
JPS5288991U (fr) * 1975-12-26 1977-07-02
US4379289A (en) * 1979-03-08 1983-04-05 Gte Laboratories Incorporated Fiber optics security system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2512312A1 (de) * 1974-03-20 1975-10-09 Sumitomo Electric Industries Lichtleiterfaser
GB2060871A (en) * 1979-08-15 1981-05-07 Perren B Self monitoring warning installation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2203832A (en) * 1987-04-16 1988-10-26 Graviner Ltd Overheat detection
GB2203832B (en) * 1987-04-16 1991-03-20 Graviner Ltd Fire detection
US7115692B2 (en) 2000-12-20 2006-10-03 Coatex S.A.S. Grinding and/or for dispersing aid of mineral materials in aqueous suspension, resulting aqueous suspensions and uses thereof
KR100883617B1 (ko) * 2000-12-20 2009-02-13 코아텍스 소시에떼 빠 악숑 셈쁠리삐에 수성 현탁액 중의 무기 물질의 분쇄 및/또는 분산 조제,그리하여 얻은 수성 현탁액 및 이의 용도
CN116343426A (zh) * 2023-03-20 2023-06-27 享成安全科技(南京)有限公司 一种带位置指示的缆式线型感温火灾探测器及其使用方法
CN116343426B (zh) * 2023-03-20 2023-09-08 享成安全科技(南京)有限公司 一种带位置指示的缆式线型感温火灾探测器及其使用方法

Also Published As

Publication number Publication date
ES8501552A1 (es) 1984-11-16
EP0113046B1 (fr) 1987-09-16
JPS5988793U (ja) 1984-06-15
EP0113046A3 (en) 1984-12-05
JPH0330952Y2 (fr) 1991-06-28
ES528187A0 (es) 1984-11-16
DE3373736D1 (en) 1987-10-22

Similar Documents

Publication Publication Date Title
FI77952C (fi) Ljusbaogsrelae.
EP0144897B1 (fr) Système à fibre optique avec capacité d'essai automatique
US4728794A (en) Radiation sensing arrangements
CA2057399A1 (fr) Detection d'incendie au moyen de la fibre optique et dispositif de detection
EP0078443A2 (fr) Système de détection d'incendie
US4322721A (en) Self-monitoring warning installation
US4734575A (en) Light barrier utilizing two radiation branches each having differently polarized filters
EP0113046A2 (fr) Détecteur de chaleur
US4639605A (en) Fire sensor device
US4712096A (en) Condition responsive detection system and method
US4308531A (en) Light transmission type smoke detector
NO324427B1 (no) Brannalarmsystem for tidligdetektering av brann
EP0113461A2 (fr) Moyens fonctionnels de test pour un détecteur de fumée du type à dispersion de lumière
JPH06341650A (ja) 電気ストーブ
JPS6044720B2 (ja) 透過式煙感知器
JPS5828316Y2 (ja) カサイカンチキ
GB1560731A (en) Radiation responsive devices
US4003039A (en) Optical fire detection system
JP2000067339A (ja) 火災検知装置
WO1982003487A1 (fr) Detecteur optique de feu
JP4323360B2 (ja) 火災感知器の状態情報取得システム
SU634332A2 (ru) Пожароизвещатель
SU1120380A1 (ru) Извещатель дыма
Farquhar et al. Overheat Detection
JPS5947360B2 (ja) 減光式火災感知器

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19831126

AK Designated contracting states

Designated state(s): BE CH DE FR GB IT LI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): BE CH DE FR GB IT LI

17Q First examination report despatched

Effective date: 19860422

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE CH DE FR GB IT LI

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 19870916

Ref country code: FR

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19870916

Ref country code: BE

Effective date: 19870916

REF Corresponds to:

Ref document number: 3373736

Country of ref document: DE

Date of ref document: 19871022

EN Fr: translation not filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PFA

Free format text: NOHMI BOSAI LTD

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19941014

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19941024

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19950103

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19951126

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19951130

Ref country code: CH

Effective date: 19951130

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19951126

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19960801