EP0066952B1 - Sensor system responsive to a fire or explosion - Google Patents

Sensor system responsive to a fire or explosion Download PDF

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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
Application number
EP82302245A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0066952A2 (en
EP0066952A3 (en
Inventor
Mark T. Kern
Robert J. Cinzori
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.)
Raytheon Co
Original Assignee
Santa Barbara Research Center
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 Santa Barbara Research Center filed Critical Santa Barbara Research Center
Publication of EP0066952A2 publication Critical patent/EP0066952A2/en
Publication of EP0066952A3 publication Critical patent/EP0066952A3/en
Application granted granted Critical
Publication of EP0066952B1 publication Critical patent/EP0066952B1/en
Expired legal-status Critical Current

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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)
EP82302245A 1981-06-02 1982-04-30 Sensor system responsive to a fire or explosion Expired EP0066952B1 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
IN157944B (ja) 1986-07-26
DE3269134D1 (en) 1986-03-27
EP0066952A2 (en) 1982-12-15
AU546773B2 (en) 1985-09-19
AU8438382A (en) 1982-12-09
KR840000005A (ko) 1984-01-30
IL65576A0 (en) 1982-07-30
KR900008377B1 (ko) 1990-11-17
JPH0632137B2 (ja) 1994-04-27
EP0066952A3 (en) 1983-06-01
IL65576A (en) 1986-03-31
JPS581288A (ja) 1983-01-06

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