US3825754A - 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 discrimination Download PDFInfo
- Publication number
- US3825754A US3825754A US00381814A US38181473A US3825754A US 3825754 A US3825754 A US 3825754A US 00381814 A US00381814 A US 00381814A US 38181473 A US38181473 A US 38181473A US 3825754 A US3825754 A US 3825754A
- Authority
- US
- United States
- Prior art keywords
- signals
- output
- threshold
- radiation
- fire
- 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 - Lifetime
Links
- 238000001514 detection method Methods 0.000 title claims abstract 8
- 230000009977 dual effect Effects 0.000 title 1
- 238000001228 spectrum Methods 0.000 title 1
- 238000004880 explosion Methods 0.000 claims abstract 17
- 230000001629 suppression Effects 0.000 claims abstract 13
- 230000003111 delayed effect Effects 0.000 claims abstract 3
- 230000005855 radiation Effects 0.000 claims 24
- 230000003595 spectral effect Effects 0.000 claims 5
- 230000005670 electromagnetic radiation Effects 0.000 claims 4
- 230000008878 coupling Effects 0.000 claims 2
- 238000010168 coupling process Methods 0.000 claims 2
- 238000005859 coupling reaction Methods 0.000 claims 2
- 230000001419 dependent effect Effects 0.000 claims 2
- 230000021715 photosynthesis, light harvesting Effects 0.000 claims 2
- 230000001934 delay Effects 0.000 claims 1
- 230000000977 initiatory effect Effects 0.000 claims 1
- 239000002828 fuel tank Substances 0.000 abstract 2
- 239000002360 explosive Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 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
-
- 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
Disclosed is a multichannel fire or explosion detection system wherein an output fire suppression or control signal is generated in response to fires or explosions which radiate power above a predetermined threshold level. The system includes means which discriminate against explosive fires in a fuel tank or other highly combustible material on the one hand and high energy exploding rounds of ammunition per se which do not subsequently cause a large scale fire. Thus, the present detection system will not generate an output fire suppression or control signal in the event a high energy ammunition round explodes in the vicinity of a fuel tank without igniting and exploding it. Additionally, fail safe detection logic means are provided in the present system and generate a time delayed fire suppression enable signal to thereby enable an output signal gate in the event of a delayed or secondary fire or explosion above a predetermined magnitude.
Claims (14)
1. A system for making energy dissipation comparisons while detecting fires and explosions above predetermined power thresholds within predetermined time periods including: a. low threshold radiation channel means responsive to minimum power fires or explosions for generating output enable signals, b. high threshold raDiation channel means responsive to fires or explosions which exceed a predetermined energy threshold for generating inhibit signals of a predetermined time duration or durations, and c. output logic gate means coupled to both said low and high threshold radiation channel means for receiving both said enable and inhibit signals, said output logic means being operative to generate an output fire control or suppression signal after the removal of said inhibit signals therefrom, whereby relatively short lived fires or explosions within the time duration of said inhibit signals are prevented from triggering an output fire detection or control signal.
2. The system defined in claim 1 wherein said high threshold radiation channel means includes: a. a threshold gate of a selected switching threshold connected in the signal path of said high threshold channel means and operative to generate logic signals of a time duration dependent upon the energy received from a fire or explosion, b. first pulse delay generating means connected between said threshold gate and one input of said output logic gate means for generating a first inhibit signal of a first predetermined time duration, and c. second pulse delay generating means coupled between said threshold gate and another input of said output logic gate means for generating a second inhibit signal of a second predetermined time duration, whereby said output logic gate means is enabled to generate a fire control or suppression signal after the termination of said inhibit signals and in the continued presence of enable signals from said low threshold radiation channel means.
3. The system defined in claim 2 which further includes: a. a second threshold gate having a second threshold switching level and connected to receive the radiation responsive detection signals from the main signal path of said high threshold channel means to thereby generate enable logic pulses of another, different predetermined time duration, and b. a second output logic gate means connected to receive both logic signals from said second threshold gate and from said second pulse delay generating means for thereby generating output fire control or suppression signals when said second output logic gate means is enabled, thereby imparting an additional level of energy discrimination to said high threshold radiation channel means.
4. The system defined in claim 3 which further includes an output OR gate connected to receive the output signals from both said first and second output logic gate means for generating the system''s output fire control or suppression signals upon receiving enable signals from either of said first and second output logic gate means.
5. The system defined in claim 1 wherein said low threshold radiation channel means includes: a. long wavelength channel means responsive to radiant energy in a predetermined spectral band of electromagnetic radiation and received from a fire or explosion for generating one output logic signal, b. short wavelength channel means responsive to radiant energy in another predetermined spectral band and received from said fire or explosion for generating another logic signal, and c. means coupling said one and another output logic signals to said output logic gate means for properly enabling same during the presence of a fire or explosion above a predetermined minimum threshold level.
6. The system defined in claim 5 wherein said coupling means includes first and second signal delay stages connected in the signal paths of said long and short wavelength channel means, respectively, and further connected to first and second inputs of said first output gate means for providing delayed enable signals thereto, whereby said first output gate means is not immediately enabled after the initiation of said fire or explosion, thereby allowing said high threshold radiation channel means to properly respond to predetermined energy levels of a radiation received from said fire or explosion and thereby temporarily inhibit said first output gate means for predetermined time durations.
7. The system defined in claim 6 wherein: a. said long wavelength channel means is responsive to radiant energy in a predetermined spectral band above about 6 microns of electromagnetic radiation, and b. said short wavelength channel means is responsive to radiant energy in a predetermined spectral band less than about 2 microns of electromagnetic radiation.
8. The system defined in claim 7 wherein said long wavelength channel means is responsive to radiation in the 7 - 30 micron range and said short wavelength channel means is responsive to radiation in the 0.7 - 1.2 micron range, and said high threshold channel radiation means is responsive to short wavelength radiation in the 0.7 - 1.2 micron range.
9. The system defined in claim 8 wherein: a. both said high threshold radiation channel means and said short wavelength radiation channel means includes a photodetector connected at each input thereof, and b. said long wavelength channel means includes a thermopile detector connected at its input and responsive to a radiation in a spectral band above about 6 microns of electromagnetic radiation.
10. The system defined in claim 9 wherein said high threshold radiation channel means includes: a. a threshold gate of a selected switching threshold connected in the signal path of said high threshold channel means and operative to generate logic signals of a time duration dependent upon the energy received from a fire or explosion, b. first pulse delay generating means connected between said threshold gate and one input of said output logic gate means for generating a first inhibit signal of a first predetermined time duration, and c. second pulse delay generating means coupled between said threshold gate and another input of said output logic gate means for generating a second inhibit signal of a second predetermined time duration, whereby said output logic gate means is enabled to generate a fire control or suppression signal after the termination of said inhibit signals and in the continued presence of enable signals from said low threshold radiation channel means.
11. The system defined in claim 10 which further includes: a. A second threshold gate having a second threshold switching level and connected to receive the radiation responsive detection signals from the main signal path of said high threshold channel means to thereby generate enable logic pulses of another, different predetermined time duration, and b. a second output logic gate means connected to receive both logic signals from said second threshold gate and from said second pulse delay generating means for thereby generating output fire control or suppression signals when said second output logic gate means is enabled, thereby imparting an additional level of energy discrimination to said high threshold radiation channel means.
12. The system defined in claim 11 which further includes an output OR gate connected to receive the output signals from both said first and second output logic gate means for generating the system''s output fire control or suppression signals upon receiving enable signals from either of said first and second output logic gate means.
13. A fire or explosion detection system for making predetermined energy dissipation comparisons including: a. threshold radiation channel means responsive to fires or explosions which generate a predetermined amount of energy within a predetermined period of time to in turn generate inhibit signals, and b. output gate means coupled to said radiation channel means and responsive to said inhibit signals to prevent an output fire suppression from being generated during the presence of said inhibit signals, whereby said channel is operative to generate said fire suppression signals after the termination of said inhibiT signals or in the event that no inhibit signals are generated.
14. The system defined in claim 13 wherein said threshold radiation channel means includes logic means for generating an inhibit signal whose time duration is proportional to the time that the radiated power from said fire or explosion is above a predetermined threshold level, whereby the variable duration of said inhibit signals may be logically compared with other fixed signal delays to prevent predetermined energy levels reached in predetermined minimum times from generating an output fire control or suppression signal.
Priority Applications (5)
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 |
DE19742425447 DE2425447C3 (en) | 1973-07-23 | 1974-05-25 | Electric fire and explosion detector |
IL44943A IL44943A (en) | 1973-07-23 | 1974-05-31 | Fire or explosion detection system with discrimination means operable in accordance with amount of energy generated within a predetermined time duration |
GB2615074A GB1462913A (en) | 1973-07-23 | 1974-06-12 | Dual spectrum infrared fire detection system with high energy ammunition round discrimination |
FR7422660A FR2238981B1 (en) | 1973-07-23 | 1974-06-28 |
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 (2)
Publication Number | Publication Date |
---|---|
US3825754A true US3825754A (en) | 1974-07-23 |
US3825754B1 US3825754B1 (en) | 1985-12-10 |
Family
ID=23506483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00381814A Expired - Lifetime US3825754A (en) | 1973-07-23 | 1973-07-23 | 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 (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2500179A1 (en) * | 1974-01-04 | 1975-07-17 | Commissariat Energie Atomique | ALARM |
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 |
US4101767A (en) * | 1977-05-20 | 1978-07-18 | Sensors, Inc. | Discriminating fire sensor |
US4162052A (en) * | 1975-12-22 | 1979-07-24 | Societe Anonyme De Telecommunications | Night guidance of self-propelled missiles |
DE2907547A1 (en) * | 1978-02-27 | 1979-11-08 | Spectronix Ltd | SYSTEM FOR DETECTION AND SUPPRESSION OF FIRE AND EXPLOSIONS |
DE2907546A1 (en) * | 1978-02-27 | 1979-11-08 | Spectronix Ltd | ARRANGEMENT FOR DETECTING FIRE AND EXPLOSIONS |
US4220857A (en) * | 1978-11-01 | 1980-09-02 | Systron-Donner Corporation | Optical flame and explosion detection system and method |
WO1981001330A1 (en) * | 1979-11-02 | 1981-05-14 | Santa Barbara Res Center | Dual spectrum infared fire sensor |
FR2486691A1 (en) * | 1980-07-12 | 1982-01-15 | Graviner Ltd | FIRE AND EXPLOSION DETECTION SYSTEM |
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 |
EP0073111A1 (en) * | 1981-08-20 | 1983-03-02 | Kidde-Graviner Limited | Improvements in and relating to fire and explosion detection and suppression |
EP0080092A1 (en) * | 1981-11-20 | 1983-06-01 | Santa Barbara Research Center | Radiation sensing fire suppression system |
US4414542A (en) * | 1980-05-17 | 1983-11-08 | Graviner Limited | Two channel comparison-type fire or explosion detecting system |
JPS58501909A (en) * | 1981-11-06 | 1983-11-10 | ラボラトイレス・フォ−ニア−・エス・エ− | Method for producing α-aspartyl phenylalanine methyl ester |
US4426591A (en) | 1980-08-04 | 1984-01-17 | Hughes Aircraft Company | Adaptive comparator |
WO1984001232A1 (en) * | 1982-09-20 | 1984-03-29 | Santa Barbara Res Center | Discriminating fire sensor with thermal override capability |
US4455487A (en) * | 1981-10-30 | 1984-06-19 | Armtec Industries, Inc. | Fire detection system with IR and UV ratio detector |
EP0159798A1 (en) | 1984-03-20 | 1985-10-30 | Kidde-Graviner Limited | Fire and explosion protection system |
WO1986000450A1 (en) * | 1984-06-18 | 1986-01-16 | Santa Barbara Research Center | Fire sensing and suppression method and system responsive to optical radiation and mechanical wave energy |
EP0175032A1 (en) * | 1984-08-16 | 1986-03-26 | Santa Barbara Research Center | Microprocessor-controlled fire sensor |
US4719973A (en) * | 1985-12-20 | 1988-01-19 | Graviner Limited | 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 |
DE4200340A1 (en) * | 1992-01-09 | 1993-07-15 | Deugra Ges Fuer Brandschutzsys | Selective detection equipment extinguishing fires - monitors readiness of extinguisher and warns of pressure deficiency endangering response to infrared-detector-generated alarm. |
US5339070A (en) * | 1992-07-21 | 1994-08-16 | Srs Technologies | Combined UV/IR flame detection system |
US5612676A (en) * | 1991-08-14 | 1997-03-18 | Meggitt Avionics, Inc. | Dual channel multi-spectrum infrared optical fire and explosion detection system |
US6150659A (en) * | 1998-04-10 | 2000-11-21 | General Monitors, Incorporated | Digital multi-frequency infrared flame detector |
EP1540615A2 (en) * | 2002-09-19 | 2005-06-15 | Pittway Corporation | Detector with ambient photon sensor and other sensors |
US20050192719A1 (en) * | 2003-12-08 | 2005-09-01 | Suneel Ismail Sheikh | Navigational system and method utilizing sources of pulsed celestial radiation |
EP1973085A2 (en) | 2007-03-22 | 2008-09-24 | Spectronix Ltd. | A method for detecting a fire condition in a monitored region |
US20090018762A1 (en) * | 2004-10-28 | 2009-01-15 | Suneel Sheikh | Navigation system and method using modulated celestial radiation sources |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2126713B (en) * | 1980-01-17 | 1984-11-21 | Graviner Ltd | Improvements in and relating to fire and explosion detection |
GB2218189A (en) * | 1987-05-30 | 1989-11-08 | Graviner Ltd | Impact detection |
Citations (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
Patent Citations (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 |
Cited By (50)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2500179A1 (en) * | 1974-01-04 | 1975-07-17 | Commissariat Energie Atomique | ALARM |
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 |
US4162052A (en) * | 1975-12-22 | 1979-07-24 | Societe Anonyme De Telecommunications | Night guidance of self-propelled missiles |
US4101767A (en) * | 1977-05-20 | 1978-07-18 | Sensors, Inc. | Discriminating fire sensor |
DE2819183A1 (en) * | 1977-05-20 | 1978-11-30 | Sensors Inc | SELECTIVE FIRE SENSING DEVICE |
FR2391520A1 (en) * | 1977-05-20 | 1978-12-15 | Sensors Inc | FIRE DETECTOR ENSURING DISCRIMINATION BETWEEN POSSIBLE CAUSES |
DE2954429A1 (en) * | 1978-02-27 | 1985-02-28 | ||
DE2907547A1 (en) * | 1978-02-27 | 1979-11-08 | Spectronix Ltd | SYSTEM FOR DETECTION AND SUPPRESSION OF FIRE AND EXPLOSIONS |
DE2907546A1 (en) * | 1978-02-27 | 1979-11-08 | Spectronix Ltd | ARRANGEMENT FOR DETECTING FIRE AND EXPLOSIONS |
US4199682A (en) * | 1978-02-27 | 1980-04-22 | Spectronix Ltd. | Fire and explosion detection apparatus |
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 |
WO1981001330A1 (en) * | 1979-11-02 | 1981-05-14 | Santa Barbara Res Center | Dual spectrum infared 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 |
US4414542A (en) * | 1980-05-17 | 1983-11-08 | Graviner Limited | Two channel comparison-type fire or explosion detecting system |
FR2486691A1 (en) * | 1980-07-12 | 1982-01-15 | Graviner Ltd | FIRE AND EXPLOSION DETECTION SYSTEM |
US4421984A (en) * | 1980-07-12 | 1983-12-20 | Graviner, Limited | Fire and explosion detection and suppression |
US4426591A (en) | 1980-08-04 | 1984-01-17 | Hughes Aircraft Company | Adaptive comparator |
EP0073111A1 (en) * | 1981-08-20 | 1983-03-02 | Kidde-Graviner Limited | Improvements in and relating to fire and explosion detection and suppression |
US4497373A (en) * | 1981-08-20 | 1985-02-05 | Graviner Limited | 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 |
JPS58501909A (en) * | 1981-11-06 | 1983-11-10 | ラボラトイレス・フォ−ニア−・エス・エ− | Method for producing α-aspartyl phenylalanine methyl ester |
US4469944A (en) * | 1981-11-20 | 1984-09-04 | Santa Barbara Research Center | Optical discriminating fire sensor |
EP0080092A1 (en) * | 1981-11-20 | 1983-06-01 | Santa Barbara Research Center | Radiation sensing fire suppression system |
WO1984001232A1 (en) * | 1982-09-20 | 1984-03-29 | Santa Barbara Res Center | Discriminating fire sensor with thermal override capability |
US4647776A (en) * | 1982-09-20 | 1987-03-03 | Santa Barbara Research Center | Discriminating fire sensor with thermal override capability |
EP0159798A1 (en) | 1984-03-20 | 1985-10-30 | Kidde-Graviner Limited | Fire and explosion protection system |
US4603255A (en) * | 1984-03-20 | 1986-07-29 | Htl Industries, Inc. | Fire and explosion protection system |
WO1986000450A1 (en) * | 1984-06-18 | 1986-01-16 | Santa Barbara Research Center | Fire sensing and suppression method and system responsive to optical radiation and mechanical wave energy |
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 |
EP0175032A1 (en) * | 1984-08-16 | 1986-03-26 | Santa Barbara Research Center | Microprocessor-controlled fire sensor |
US4719973A (en) * | 1985-12-20 | 1988-01-19 | Graviner Limited | Fire and explosion detection and suppression |
WO1989004528A1 (en) * | 1987-11-02 | 1989-05-18 | Santa Barbara Research Center | Real time adaptive round discrimination fire sensor |
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 |
DE4200340A1 (en) * | 1992-01-09 | 1993-07-15 | Deugra Ges Fuer Brandschutzsys | Selective detection equipment extinguishing fires - monitors readiness of extinguisher and warns of pressure deficiency endangering response to infrared-detector-generated alarm. |
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 |
EP1540615A2 (en) * | 2002-09-19 | 2005-06-15 | Pittway Corporation | Detector with ambient photon sensor and other sensors |
EP1540615A4 (en) * | 2002-09-19 | 2009-08-05 | Honeywell Int Inc | Detector with ambient photon sensor and other sensors |
US20050192719A1 (en) * | 2003-12-08 | 2005-09-01 | Suneel Ismail Sheikh | Navigational system and method utilizing sources of pulsed celestial radiation |
US7197381B2 (en) * | 2003-12-08 | 2007-03-27 | University Of Maryland | Navigational system and method utilizing sources of pulsed celestial radiation |
US20090018762A1 (en) * | 2004-10-28 | 2009-01-15 | Suneel Sheikh | Navigation system and method using modulated celestial radiation sources |
US7831341B2 (en) | 2004-10-28 | 2010-11-09 | University Of Maryland | Navigation system and method using modulated celestial radiation sources |
EP1973085A2 (en) | 2007-03-22 | 2008-09-24 | Spectronix Ltd. | A method for detecting a fire condition in a monitored region |
US20080230701A1 (en) * | 2007-03-22 | 2008-09-25 | Spectronix Ltd. | Method for detecting a fire condition in a monitored region |
US7638770B2 (en) | 2007-03-22 | 2009-12-29 | Spectronix Ltd. | Method for detecting a fire condition in a monitored region |
Also Published As
Publication number | Publication date |
---|---|
DE2425447A1 (en) | 1975-02-13 |
US3825754B1 (en) | 1985-12-10 |
FR2238981B1 (en) | 1978-01-13 |
DE2425447B2 (en) | 1976-09-02 |
IL44943A (en) | 1977-02-28 |
FR2238981A1 (en) | 1975-02-21 |
GB1462913A (en) | 1977-01-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
RR | Request for reexamination filed |
Effective date: 19840911 |
|
B1 | Reexamination certificate first reexamination |