GB1462913A - Dual spectrum infrared fire detection system with high energy ammunition round discrimination - Google Patents
Dual spectrum infrared fire detection system with high energy ammunition round discriminationInfo
- Publication number
- GB1462913A GB1462913A GB2615074A GB2615074A GB1462913A GB 1462913 A GB1462913 A GB 1462913A GB 2615074 A GB2615074 A GB 2615074A GB 2615074 A GB2615074 A GB 2615074A GB 1462913 A GB1462913 A GB 1462913A
- Authority
- GB
- United Kingdom
- Prior art keywords
- explosion
- gate
- fire
- logical
- delay
- 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
- 238000001514 detection method Methods 0.000 title abstract 4
- 230000009977 dual effect Effects 0.000 title 1
- 238000001228 spectrum Methods 0.000 title 1
- 238000004880 explosion Methods 0.000 abstract 17
- 230000001934 delay Effects 0.000 abstract 4
- 239000002828 fuel tank Substances 0.000 abstract 3
- 230000005855 radiation Effects 0.000 abstract 2
- 230000001629 suppression Effects 0.000 abstract 2
- 230000003111 delayed effect Effects 0.000 abstract 1
- 230000000630 rising effect Effects 0.000 abstract 1
- 230000001960 triggered effect Effects 0.000 abstract 1
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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/292—Extracting wanted echo-signals
- G01S7/2921—Extracting wanted echo-signals based on data belonging to one radar period
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire-Detection Mechanisms (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
1462913 Detecting fires and explosions HUGHES AIRCRAFT CO 12 June 1974 [23 July 1973] 26150/74 Heading G1A In a fire detection device capable of recognising the difference between an explosion "per se" without a subsequent fire and an explosion producing a fire, the basic long and short wave infra-red detector circuit 14 and 12 of Specification No. 1432106 is used in conjunction with an explosion detection channel 18 and logic circuit to only produce an output when a fire is present. Explosion present inside a fuel tank causing a fire. When this happens there is a relatively slow build-up of radiation. The output of the thermopile 40 and the photo diode 30 of the long and short wave channels 14 and 12 are amplified 44, 32, inverted 46, 34, and passed to threshold gates 36, 48. Thus if a fire is present or an explosion is occurring, the gates 36, 48, will produce outputs that are delayed by delays 38 and 50 before passing to an AND gate 56. This gate also receives two logical 1 signals from the explosion detection channel 18 which, in the absence of an explosion "in open air", is in its quiescent state, so the AND gate 56 output can pass via an OR gate 110 to activate some kind of fire suppression system. An explosion outside the fuel tank but no fire. When an explosion occurs detectors 30 and 40 will be activated in the normal way and so will a further photodiode 64 whose processed output signal is supplied to first and second level threshold gates 70, 72. The threshold gates 70, 72 and the associated logic circuitry of monostable multi-vibrators 86 and 96, and gates 90 and 84, and delay circuits 88, 94 and 98, are designed to respond to the characteristic intensity pattern of an explosion in "open air" and operate a system of delays, including a 25 second delay introduced by multi-vibrator 96, to provide logical 0 signals on either of lines 58 or 60 during the explosion, so that in conjunction with the delays introduced into channels 12 and 14, the AND gate 56 does not produce a logical 1 output. A detailed explanation using waveforms Fig. 2 (not shown) is disclosed. An explosion outside the fuel tank - then a secondary fire. During the 25 second delay provided by the "Q" output of the monostable multivibrator 96, a logical 1 signal is provided via a delay, 65 millisecs, circuit 98 to an AND gate 102. Thus if a fire develops after the explosion and within the 25 second delay imposed by multi-vibrator 96, then the first level gate 20 will be triggered once again by the rising incident radiation intensity to provide another logical 1 to the AND gate 102. Thus there will be a logical 1 output from AND gate 102 which, on passing via OR gate 110, activates the fire suppression apparatus. An explosion partly in the tank and partly outside the tank causing a fire. This type of explosion is characterized by a narrower intensity peak Fig. 4a (not shown) than the "normal" explosion in "open air", and the signal passing through the second level threshold gate 72 is of a shorter duration than the delay imposed by a delay circuit 86, 5 millisecs, on the signal from a multi-vibrator 86 so that signal from the delay circuit is not present when the signal on line 82 from the gate 76 is present, and so the 25 second multi-vibrator 96 is not activated. Thus by the time that the signals from detectors 30 and 40 have passed through the delays 38 and 50, the channel 18 is back in its quiescent state wherein two logical 1 outputs are on lines 58 and 60. The description discloses several waveforms Figs. 2, 3 and 4 (not shown) showing the circuit operation.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00381814A US3825754A (en) | 1973-07-23 | 1973-07-23 | Dual spectrum infrared fire detection system with high energy ammunition round discrimination |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1462913A true GB1462913A (en) | 1977-01-26 |
Family
ID=23506483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2615074A Expired GB1462913A (en) | 1973-07-23 | 1974-06-12 | Dual spectrum infrared fire detection system with high energy ammunition round discrimination |
Country Status (4)
Country | Link |
---|---|
US (1) | US3825754A (en) |
FR (1) | FR2238981B1 (en) |
GB (1) | GB1462913A (en) |
IL (1) | IL44943A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2126713A (en) * | 1980-01-17 | 1984-03-28 | Graviner Ltd | Improvements in and relating to fire and explosion detection |
GB2218189A (en) * | 1987-05-30 | 1989-11-08 | Graviner Ltd | Impact detection |
Families Citing this family (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2257118B1 (en) * | 1974-01-04 | 1976-11-26 | Commissariat Energie Atomique | |
US3936822A (en) * | 1974-06-14 | 1976-02-03 | Hirschberg Kenneth A | Method and apparatus for detecting weapon fire |
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 |
FR2336655A1 (en) * | 1975-12-22 | 1977-07-22 | Telecommunications Sa | IMPROVEMENT IN NOCTURNAL GUIDANCE OF SELF-PROPELLED EQUIPMENT |
US4101767A (en) * | 1977-05-20 | 1978-07-18 | Sensors, Inc. | Discriminating fire sensor |
IL54137A (en) * | 1978-02-27 | 1985-02-28 | Spectronix Ltd | Fire and explosion detection apparatus |
IL54138A (en) * | 1978-02-27 | 1983-10-31 | Spectronix Ltd | Fire and explosion detection and suppression system |
US4220857A (en) * | 1978-11-01 | 1980-09-02 | Systron-Donner Corporation | Optical flame and explosion detection system and method |
US4296324A (en) * | 1979-11-02 | 1981-10-20 | Santa Barbara Research Center | Dual spectrum infrared fire sensor |
US4357534A (en) * | 1980-01-17 | 1982-11-02 | Graviner Limited | Fire and explosion detection |
US4373136A (en) * | 1980-01-17 | 1983-02-08 | Graviner Limited | Fire and explosion detection |
GB2076148B (en) * | 1980-05-17 | 1984-08-30 | Graviner Ltd | Improvements in and relating to fire or explosion detection |
GB2079933B (en) * | 1980-07-12 | 1984-05-31 | Graviner Ltd | Improvements in and relating to fire and explosion detection and suppression |
US4426591A (en) | 1980-08-04 | 1984-01-17 | Hughes Aircraft Company | Adaptive comparator |
US4679156A (en) * | 1981-05-21 | 1987-07-07 | Santa Barbara Research Center | Microprocessor-controlled fire sensor |
ATE14355T1 (en) * | 1981-08-20 | 1985-08-15 | Graviner Ltd | FIRE AND EXPLOSION DETECTION AND SUPPRESSION. |
US4455487A (en) * | 1981-10-30 | 1984-06-19 | Armtec Industries, Inc. | Fire detection system with IR and UV ratio detector |
FR2516077A1 (en) * | 1981-11-06 | 1983-05-13 | Human Pharm Sa Laboratoires | PROCESS FOR THE PREPARATION OF ESTER-METHYLIC OF A-ASPARTYL PHENYLALANINE |
US4469944A (en) * | 1981-11-20 | 1984-09-04 | Santa Barbara Research Center | Optical discriminating fire sensor |
JPH0754557B2 (en) * | 1982-09-20 | 1995-06-07 | サンタバーバラ・リサーチ・センター | Fire identification sensor with heat-sensitive auxiliary drive capability |
US4603255A (en) * | 1984-03-20 | 1986-07-29 | Htl Industries, Inc. | Fire and explosion protection system |
US4630684A (en) * | 1984-06-18 | 1986-12-23 | Santa Barbara Research Center | Fire sensing and suppression method and system responsive to optical radiation and mechanical wave energy |
GB2184584B (en) * | 1985-12-20 | 1989-10-25 | Graviner Ltd | Fire and explosion detection and suppression |
US4783592A (en) * | 1987-11-02 | 1988-11-08 | Santa Barbara Research Center | Real time adaptive round discrimination fire sensor |
US5122628A (en) * | 1990-05-25 | 1992-06-16 | Fike Corporation | Sudden pressure rise detector |
US5612676A (en) * | 1991-08-14 | 1997-03-18 | Meggitt Avionics, Inc. | Dual channel multi-spectrum infrared optical fire and explosion detection system |
DE4200340C2 (en) * | 1992-01-09 | 1995-08-24 | Kidde Deugra Brandschutzsystem | Device for selective fire detection and triggering an extinguishing process |
US5339070A (en) * | 1992-07-21 | 1994-08-16 | Srs Technologies | Combined UV/IR flame detection system |
US6150659A (en) * | 1998-04-10 | 2000-11-21 | General Monitors, Incorporated | Digital multi-frequency infrared flame detector |
US6967582B2 (en) * | 2002-09-19 | 2005-11-22 | Honeywell International Inc. | Detector with ambient photon sensor and other sensors |
US7197381B2 (en) * | 2003-12-08 | 2007-03-27 | University Of Maryland | Navigational system and method utilizing sources of pulsed celestial radiation |
US7831341B2 (en) * | 2004-10-28 | 2010-11-09 | University Of Maryland | Navigation system and method using modulated celestial radiation sources |
US7638770B2 (en) * | 2007-03-22 | 2009-12-29 | Spectronix Ltd. | Method for detecting a fire condition in a monitored region |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3147380A (en) * | 1960-05-26 | 1964-09-01 | Western Union Telegraph Co | Nuclear bomb explosion detecting device |
-
1973
- 1973-07-23 US US00381814A patent/US3825754A/en not_active Expired - Lifetime
-
1974
- 1974-05-31 IL IL44943A patent/IL44943A/en unknown
- 1974-06-12 GB GB2615074A patent/GB1462913A/en not_active Expired
- 1974-06-28 FR FR7422660A patent/FR2238981B1/fr not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2126713A (en) * | 1980-01-17 | 1984-03-28 | Graviner Ltd | Improvements in and relating to fire and explosion detection |
GB2218189A (en) * | 1987-05-30 | 1989-11-08 | Graviner Ltd | Impact detection |
Also Published As
Publication number | Publication date |
---|---|
DE2425447B2 (en) | 1976-09-02 |
IL44943A (en) | 1977-02-28 |
FR2238981B1 (en) | 1978-01-13 |
US3825754B1 (en) | 1985-12-10 |
DE2425447A1 (en) | 1975-02-13 |
US3825754A (en) | 1974-07-23 |
FR2238981A1 (en) | 1975-02-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 19940611 |