EP0066952B1 - Sensor system responsive to a fire or explosion - Google Patents
Sensor system responsive to a fire or explosion Download PDFInfo
- Publication number
- EP0066952B1 EP0066952B1 EP82302245A EP82302245A EP0066952B1 EP 0066952 B1 EP0066952 B1 EP 0066952B1 EP 82302245 A EP82302245 A EP 82302245A EP 82302245 A EP82302245 A EP 82302245A EP 0066952 B1 EP0066952 B1 EP 0066952B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control signal
- fire
- sensor system
- spectral band
- detector
- 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
Links
- 238000004880 explosion Methods 0.000 title claims description 6
- 230000003595 spectral effect Effects 0.000 claims description 16
- 230000009977 dual effect Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 230000001934 delay Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Images
Classifications
-
- 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
- the present invention provides a sensor system of the type disclosed in US-A-4 220 857 comprising a first control signal means responsive to a first radiant energy detector, for generating a first control signal when the first detector detects electromagnetic energy within a first spectral band having an amplitude greater than a first predetermined level; a second control signal means responsive to a second radiant energy detector, for generating a second control signal when the second detector detects electromagnetic energy within a second spectral band having an amplitude greater than a second predetermined level; and a third control signal means responsive to the first and second radiant energy detectors, for generating a third control signal whenever the ratio of the energy detected by the first detector to the amplitude of the energy detected by the second detector exceeds a third predetermined level.
- the length of the delay period may be determined in various ways by different types of delay circuits incorporated in the third channel.
- the type of delay circuit utilized may depend on the type of fire or explosion that might be expected to occur in the monitored area.
- a simple type of delay circuit is one that merely interrupts the generation of the fifth control signal for a predetermined period of time after the difference between the first and second control signals exceeds the third predetermined level.
- a three channel sensor system 10 has a photon detector 15 that is responsive to radiant energy within a spectral band of relatively short wavelength (0.7 to 1.2 pm, for example), and a thermal detector 20 that is responsive to a spectral band of relatively long wavelength (7 to 30 pm, for example).
- the analog output of each detector 15 and 20 is amplified by amplifiers 25 and 30 respectively.
- the outputs of amplifiers 25 and 30, which are hereinafter called nodes a and b respectively, are fed to amplifiers 35 and 40 respectively.
- the output of amplifier 35 is fed to a threshold device 45 having a predetermined threshold level Vn.
- the output of amplifier 40 is fed to a threshold device 50 having a predetermined threshold level V T2 .
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fire-Detection Mechanisms (AREA)
- Fire Alarms (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US26920881A | 1981-06-02 | 1981-06-02 | |
US269208 | 1981-06-02 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0066952A2 EP0066952A2 (en) | 1982-12-15 |
EP0066952A3 EP0066952A3 (en) | 1983-06-01 |
EP0066952B1 true EP0066952B1 (en) | 1986-02-19 |
Family
ID=23026264
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82302245A Expired EP0066952B1 (en) | 1981-06-02 | 1982-04-30 | Sensor system responsive to a fire or explosion |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0066952B1 (ja) |
JP (1) | JPH0632137B2 (ja) |
KR (1) | KR900008377B1 (ja) |
AU (1) | AU546773B2 (ja) |
DE (1) | DE3269134D1 (ja) |
IL (1) | IL65576A (ja) |
IN (1) | IN157944B (ja) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4679156A (en) * | 1981-05-21 | 1987-07-07 | Santa Barbara Research Center | Microprocessor-controlled fire sensor |
US4469944A (en) * | 1981-11-20 | 1984-09-04 | Santa Barbara Research Center | Optical discriminating fire sensor |
IL65517A (en) * | 1982-04-18 | 1988-02-29 | Spectronix Ltd | Discrimination circuitry for fire and explosion suppression apparatus |
US4765244A (en) * | 1983-04-15 | 1988-08-23 | Spectronix Ltd. | Apparatus for the detection and destruction of incoming objects |
GB2142757B (en) * | 1983-05-21 | 1986-11-26 | Graviner Ltd | Improvements in and relating to fire and explosion detection and suppression |
GB2218189A (en) * | 1987-05-30 | 1989-11-08 | Graviner Ltd | Impact detection |
US7100437B2 (en) * | 2003-11-24 | 2006-09-05 | Advanced Design Consulting Usa, Inc. | Device for collecting statistical data for maintenance of small-arms |
CN112720069B (zh) * | 2020-12-22 | 2022-03-22 | 北京工业大学 | 刀具磨损监测方法、装置、电子设备及存储介质 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4206454A (en) * | 1978-05-08 | 1980-06-03 | Chloride Incorporated | Two channel optical flame detector |
JPS5834555Y2 (ja) * | 1978-07-01 | 1983-08-03 | ホーチキ株式会社 | 蓄積型火災感知器 |
US4220857A (en) * | 1978-11-01 | 1980-09-02 | Systron-Donner Corporation | Optical flame and explosion detection system and method |
GB2067749B (en) * | 1980-01-17 | 1984-12-12 | Graviner Ltd | Fire and explosion detection |
-
1982
- 1982-04-21 IN IN319/DEL/82A patent/IN157944B/en unknown
- 1982-04-22 IL IL65576A patent/IL65576A/xx unknown
- 1982-04-30 DE DE8282302245T patent/DE3269134D1/de not_active Expired
- 1982-04-30 EP EP82302245A patent/EP0066952B1/en not_active Expired
- 1982-05-28 KR KR8202383A patent/KR900008377B1/ko active
- 1982-06-01 AU AU84383/82A patent/AU546773B2/en not_active Ceased
- 1982-06-02 JP JP57093258A patent/JPH0632137B2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
AU8438382A (en) | 1982-12-09 |
IN157944B (ja) | 1986-07-26 |
DE3269134D1 (en) | 1986-03-27 |
IL65576A0 (en) | 1982-07-30 |
EP0066952A2 (en) | 1982-12-15 |
JPH0632137B2 (ja) | 1994-04-27 |
IL65576A (en) | 1986-03-31 |
KR840000005A (ko) | 1984-01-30 |
AU546773B2 (en) | 1985-09-19 |
JPS581288A (ja) | 1983-01-06 |
KR900008377B1 (ko) | 1990-11-17 |
EP0066952A3 (en) | 1983-06-01 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 19831021 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SANTA BARBARA RESEARCH CENTER |
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ITF | It: translation for a ep patent filed | ||
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