GB2020417A - Flame detecting fire alarm - Google Patents

Flame detecting fire alarm

Info

Publication number
GB2020417A
GB2020417A GB7914323A GB7914323A GB2020417A GB 2020417 A GB2020417 A GB 2020417A GB 7914323 A GB7914323 A GB 7914323A GB 7914323 A GB7914323 A GB 7914323A GB 2020417 A GB2020417 A GB 2020417A
Authority
GB
United Kingdom
Prior art keywords
circuit
emission
alarm
flame
output signal
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
GB7914323A
Other versions
GB2020417B (en
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
Publication of GB2020417A publication Critical patent/GB2020417A/en
Application granted granted Critical
Publication of GB2020417B publication Critical patent/GB2020417B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/04—Casings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/0014—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation from gases, flames
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/04—Casings
    • G01J5/046—Materials; Selection of thermal materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G01J5/0801—Means for wavelength selection or discrimination
    • G01J5/0802—Optical filters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G01J5/0875—Windows; Arrangements for fastening thereof
    • 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

Abstract

A first channel including filter 1 and photodetector 2 senses emission from a flame in the wavelength range below 6 mu particularly that characteristic of carbon dioxide and produces signals to be used to operate alarm means. A second channel including filter 9 and detector 10 senses spurious emission produced by other thermal radiators in the wavelength range of a long-wave spurious emission above 6 mu m. Means 17, 18 interconnects the circuits of the first and second channels in such a way that, while taking account of the statistical distribution of the flame emission and the spurious emission, an output signal is produced in such a way that the further transmission of the signal of the first circuit is blocked if a unidirectional output signal of the second circuit occurs synchronously therewith whereas it is transmitted to the alarm means if the output signal of the second circuit is non-synchronous or of opposite phase with respect to the first circuit signal, is absent or does not occur unidirectionally. The first and second channel circuits utilize flame flicker frequency filters of the same band pass range. The gate circuit 18 output is applied to an integrator 19 to avoid spurious signals actuating the alarm, and a delay line 21 to delay initiation of an alarm. Construction of the filters 1, 9 is described, Figure 8. Various types of photodetector 2, 10 may be employed. Other circuits are described, Figures 10, 11, 12. <IMAGE>
GB7914323A 1978-04-25 1979-04-24 Flame detector fire alarm Expired GB2020417B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH446678A CH628171A5 (en) 1978-04-25 1978-04-25 FLAME DETECTOR.

Publications (2)

Publication Number Publication Date
GB2020417A true GB2020417A (en) 1979-11-14
GB2020417B GB2020417B (en) 1982-11-24

Family

ID=4276616

Family Applications (2)

Application Number Title Priority Date Filing Date
GB8103946A Withdrawn GB2065880A (en) 1978-04-25 1979-04-24 Radiation Detector for a Fire Alarm
GB7914323A Expired GB2020417B (en) 1978-04-25 1979-04-24 Flame detector fire alarm

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB8103946A Withdrawn GB2065880A (en) 1978-04-25 1979-04-24 Radiation Detector for a Fire Alarm

Country Status (7)

Country Link
JP (1) JPS54146596A (en)
AT (1) AT381406B (en)
AU (1) AU521239B2 (en)
CH (2) CH628171A5 (en)
DE (2) DE2857795C2 (en)
FR (2) FR2424036A1 (en)
GB (2) GB2065880A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2495319A1 (en) * 1980-12-03 1982-06-04 Cerberus Ag RADIATION DETECTOR FOR A FLAME WARNING
EP0064811A1 (en) * 1981-04-16 1982-11-17 EMI Limited Flame detector
WO1986006859A2 (en) * 1985-05-17 1986-11-20 Santa Barbara Research Center Fire sensor cross-correlator circuit and method
US4742236A (en) * 1985-04-27 1988-05-03 Minolta Camera Kabushiki Kaisha Flame detector for detecting phase difference in two different wavelengths of light
US8253106B2 (en) 2009-05-13 2012-08-28 Minimax Gmbh & Co. Kg Device and method for detecting flames
US8400314B2 (en) 2009-05-13 2013-03-19 Minimax Gmbh & Co. Kg Fire alarm
EP2639778A1 (en) * 2012-03-12 2013-09-18 Honeywell International, Inc. Method and device for detection of multiple flame types

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2622382B2 (en) * 1987-07-30 1997-06-18 バブコツク日立株式会社 Flame detector
DE3924250A1 (en) * 1989-07-21 1991-02-07 Preussag Ag Feuerschutz FIRE DETECTOR
DE102021004593A1 (en) 2021-09-10 2023-03-16 Promecon Process Measurement Control Gmbh Metallurgical melting furnace and method for determining the amount of heteromolecular gas

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665440A (en) * 1969-08-19 1972-05-23 Teeg Research Inc Fire detector utilizing ultraviolet and infrared sensors
FR2151148A5 (en) * 1971-08-20 1973-04-13 Detection Electro Fse
US3896311A (en) * 1974-01-02 1975-07-22 Minnesota Mining & Mfg Pyroelectric motion and temperature sensitive infrared detector with conductive fingers
US3992110A (en) * 1974-09-03 1976-11-16 The United States Of America As Represented By The Secretary Of The Navy Multi-spectral optical comparator

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2495319A1 (en) * 1980-12-03 1982-06-04 Cerberus Ag RADIATION DETECTOR FOR A FLAME WARNING
EP0064811A1 (en) * 1981-04-16 1982-11-17 EMI Limited Flame detector
US4742236A (en) * 1985-04-27 1988-05-03 Minolta Camera Kabushiki Kaisha Flame detector for detecting phase difference in two different wavelengths of light
WO1986006859A2 (en) * 1985-05-17 1986-11-20 Santa Barbara Research Center Fire sensor cross-correlator circuit and method
WO1986006859A3 (en) * 1985-05-17 1987-02-26 Santa Barbara Res Center Fire sensor cross-correlator circuit and method
US8253106B2 (en) 2009-05-13 2012-08-28 Minimax Gmbh & Co. Kg Device and method for detecting flames
US8400314B2 (en) 2009-05-13 2013-03-19 Minimax Gmbh & Co. Kg Fire alarm
EP2639778A1 (en) * 2012-03-12 2013-09-18 Honeywell International, Inc. Method and device for detection of multiple flame types
US9587987B2 (en) 2012-03-12 2017-03-07 Honeywell International Inc. Method and device for detection of multiple flame types

Also Published As

Publication number Publication date
CH640963A5 (en) 1984-01-31
FR2470418B1 (en) 1985-04-12
DE2823411C2 (en) 1982-06-03
FR2424036A1 (en) 1979-11-23
DE2823411A1 (en) 1979-11-08
FR2470418A1 (en) 1981-05-29
FR2424036B1 (en) 1983-07-18
JPS54146596A (en) 1979-11-15
CH628171A5 (en) 1982-02-15
GB2020417B (en) 1982-11-24
ATA252479A (en) 1986-02-15
AU521239B2 (en) 1982-03-25
JPS6239473B2 (en) 1987-08-24
GB2065880A (en) 1981-07-01
DE2857795C2 (en) 1985-09-26
AU4648679A (en) 1979-11-01
AT381406B (en) 1986-10-10

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950424