EP0113046B1 - Wärmefühler - Google Patents

Wärmefühler Download PDF

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Publication number
EP0113046B1
EP0113046B1 EP19830111869 EP83111869A EP0113046B1 EP 0113046 B1 EP0113046 B1 EP 0113046B1 EP 19830111869 EP19830111869 EP 19830111869 EP 83111869 A EP83111869 A EP 83111869A EP 0113046 B1 EP0113046 B1 EP 0113046B1
Authority
EP
European Patent Office
Prior art keywords
light emitting
fire
light
optical fiber
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.)
Expired
Application number
EP19830111869
Other languages
English (en)
French (fr)
Other versions
EP0113046A2 (de
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/de
Publication of EP0113046A3 publication Critical patent/EP0113046A3/en
Application granted granted Critical
Publication of EP0113046B1 publication Critical patent/EP0113046B1/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
    • G08B17/06—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 invention relates to a heat detector comprising of an optical fiber, which is vulnerable to fusing at a low temperature, as heat sensing element according to the preamble of the patent claim.
  • Such heat detectors are used for instance in fire detecting systems.
  • a fire detector which comprises an optical fiber, stable to approximately 57°C, which melts above approximately 68,5°C.
  • heat detectors use optical fibers being vulnerable in a low temperature range of some 60--300°C as heat sensing wires and which detect fires by decrease in light reaching the photoelectric elements as caused when the optical fibers are damaged by heat or flame in case of fire, and the light from the light emitting elements leaks out through the damaged portions.
  • 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.
  • 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
  • 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 a pulsed output, to modulate the light emitting current pulse by the 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.
  • occurrence 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)
  • Light Guides In General And Applications Therefor (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Claims (1)

  1. Ein Wärmemelder mit einem Licht aussendenden Element (2), mit einem Schaltkreis (3, 4, 5), der einen modulierten Lichtaussende-Strom zu dem Licht aussendenden Element (2) sendet, mit einer optischen Faser (1), durch welche das modulierte Licht von dem Licht aussendenden Element (2) geleitet wird und welche verletzlich gegenüber Brechen, Schmelzen bei einer niedrigen Temperatur usw. ist, mit einem photoelektrischen Element (6), welches Licht aus der optischen Faser (1) empfängt und mit einem Branddetektions-Schaltkreis (9), welcher den modulierten Lichtanteil des Ausgangssignals des photoelektrischen Elementes (6) überwacht, um zu bestimmen, ob ein Feuer ausgebrochen ist oder nicht, dadurch gekennzeichnet, dass der Schaltkreis (4), welcher modulierten Lichtaussende-Strom abgibt, so ausgebildet ist, dass der modulierte Lichtaussende-Strom in Abständen dem Licht aussendenden Element (2) zugeführt wird und dass der Branddetektions-Schaltkreis (9) so ausgebildet ist, dass er das Ausgangssignal des photoelektrischen Elementes synchron mit dem modulierten Lichtaussende-Strom Ausgang detektiert.
EP19830111869 1982-12-03 1983-11-26 Wärmefühler Expired EP0113046B1 (de)

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 EP0113046A2 (de) 1984-07-11
EP0113046A3 EP0113046A3 (en) 1984-12-05
EP0113046B1 true EP0113046B1 (de) 1987-09-16

Family

ID=16121297

Family Applications (1)

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

Country Status (4)

Country Link
EP (1) EP0113046B1 (de)
JP (1) JPS5988793U (de)
DE (1) DE3373736D1 (de)
ES (1) ES8501552A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2203832B (en) * 1987-04-16 1991-03-20 Graviner Ltd Fire detection
FR2818166B1 (fr) 2000-12-20 2003-10-31 Coatex Sas Agent d'aide au broyage et/ou de dispersion de materiaux mineraux en suspension aqueuse. suspensions aqueuses obtenues et leurs utilisations
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

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5070890U (de) * 1973-10-31 1975-06-23
DE2512312C2 (de) * 1974-03-20 1984-09-13 Sumitomo Electric Industries, Ltd., Osaka Verfahren zum Beschichten einer optischen Lichtleitglasfaser
JPS5288991U (de) * 1975-12-26 1977-07-02
US4379289A (en) * 1979-03-08 1983-04-05 Gte Laboratories Incorporated Fiber optics security system
CH639789A5 (de) * 1979-08-15 1983-11-30 Benno Perren Selbstueberwachende warnanlage.

Also Published As

Publication number Publication date
EP0113046A2 (de) 1984-07-11
EP0113046A3 (en) 1984-12-05
JPH0330952Y2 (de) 1991-06-28
DE3373736D1 (en) 1987-10-22
ES528187A0 (es) 1984-11-16
ES8501552A1 (es) 1984-11-16
JPS5988793U (ja) 1984-06-15

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