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 PDF

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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
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United States
Prior art keywords
signals
output
threshold
radiation
fire
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Expired - Lifetime
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US00381814A
Inventor
R Cinzori
G Stapleton
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Raytheon Co
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Santa Barbara Research Center
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Application filed by Santa Barbara Research Center filed Critical Santa Barbara Research Center
Priority to US00381814A priority Critical patent/US3825754A/en
Priority to DE19742425447 priority patent/DE2425447C3/en
Priority to IL44943A priority patent/IL44943A/en
Priority to GB2615074A priority patent/GB1462913A/en
Priority to FR7422660A priority patent/FR2238981B1/fr
Application granted granted Critical
Publication of US3825754A publication Critical patent/US3825754A/en
Publication of US3825754B1 publication Critical patent/US3825754B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

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.
US00381814A 1973-07-23 1973-07-23 Dual spectrum infrared fire detection system with high energy ammunition round discrimination Expired - Lifetime US3825754A (en)

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

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US00381814A Expired - Lifetime US3825754A (en) 1973-07-23 1973-07-23 Dual spectrum infrared fire detection system with high energy ammunition round discrimination

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US (1) US3825754A (en)
FR (1) FR2238981B1 (en)
GB (1) GB1462913A (en)
IL (1) IL44943A (en)

Cited By (33)

* Cited by examiner, † Cited by third party
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
DE2907546A1 (en) * 1978-02-27 1979-11-08 Spectronix Ltd ARRANGEMENT FOR DETECTING FIRE AND EXPLOSIONS
DE2907547A1 (en) * 1978-02-27 1979-11-08 Spectronix Ltd SYSTEM FOR DETECTION AND SUPPRESSION OF 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)

* Cited by examiner, † Cited by third party
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)

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US3147380A (en) * 1960-05-26 1964-09-01 Western Union Telegraph Co Nuclear bomb explosion detecting device

Patent Citations (1)

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US3147380A (en) * 1960-05-26 1964-09-01 Western Union Telegraph Co Nuclear bomb explosion detecting device

Cited By (50)

* Cited by examiner, † Cited by third party
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
DE2907546A1 (en) * 1978-02-27 1979-11-08 Spectronix Ltd ARRANGEMENT FOR DETECTING FIRE AND EXPLOSIONS
DE2907547A1 (en) * 1978-02-27 1979-11-08 Spectronix Ltd SYSTEM FOR DETECTION AND SUPPRESSION OF 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
IL44943A (en) 1977-02-28
GB1462913A (en) 1977-01-26
FR2238981A1 (en) 1975-02-21
DE2425447A1 (en) 1975-02-13
FR2238981B1 (en) 1978-01-13
US3825754B1 (en) 1985-12-10
DE2425447B2 (en) 1976-09-02

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RR Request for reexamination filed

Effective date: 19840911

B1 Reexamination certificate first reexamination