GB1082973A - Electrical interrupted-beam alarm systems - Google Patents

Electrical interrupted-beam alarm systems

Info

Publication number
GB1082973A
GB1082973A GB1370264A GB1370264A GB1082973A GB 1082973 A GB1082973 A GB 1082973A GB 1370264 A GB1370264 A GB 1370264A GB 1370264 A GB1370264 A GB 1370264A GB 1082973 A GB1082973 A GB 1082973A
Authority
GB
United Kingdom
Prior art keywords
detector
pulsed supply
interrupted
electrical
comparing
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
GB1370264A
Inventor
Charles Henry Anthony Syms
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.)
International Research and Development Co Ltd
Original Assignee
International Research and Development Co Ltd
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 International Research and Development Co Ltd filed Critical International Research and Development Co Ltd
Priority to GB1370264A priority Critical patent/GB1082973A/en
Priority to NL6504092A priority patent/NL6504092A/xx
Publication of GB1082973A publication Critical patent/GB1082973A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

1,082,973. Intruder and smoke alarms. INTERNATIONAL RESEARCH & DEVELOPMENT CO. Ltd. March 31, 1965 [April 2, 1964], No. 13702/64. Heading G4N. [Also in Division G1] In a photo-electric alarm system, the source of radiation, which may be a semiconductor device, is energized by an oscillator giving a pulsed supply and the detector circuit includes a phase comparator for comparing the phase of the detector output with that of the pulsed supply. The detector may also be a semiconductor device. The system may operate as an intruder alarm by directing the light beam across doorways, windows or the like or as a fire alarm which detects smoke reducing the intensity of radiation falling on the detector by comparing the amplitude of the detector output with that of the pulsed supply or with a voltage generated in a detector circuit amplifier.
GB1370264A 1964-04-02 1964-04-02 Electrical interrupted-beam alarm systems Expired GB1082973A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1370264A GB1082973A (en) 1964-04-02 1964-04-02 Electrical interrupted-beam alarm systems
NL6504092A NL6504092A (en) 1964-04-02 1965-03-31

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1370264A GB1082973A (en) 1964-04-02 1964-04-02 Electrical interrupted-beam alarm systems

Publications (1)

Publication Number Publication Date
GB1082973A true GB1082973A (en) 1967-09-13

Family

ID=10027836

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1370264A Expired GB1082973A (en) 1964-04-02 1964-04-02 Electrical interrupted-beam alarm systems

Country Status (2)

Country Link
GB (1) GB1082973A (en)
NL (1) NL6504092A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2157741A1 (en) * 1971-10-29 1973-06-08 Thomson Csf
FR2460012A1 (en) * 1979-06-27 1981-01-16 Hochiki Co PHOTOELECTRIC DETECTOR
EP0039799A1 (en) * 1980-05-09 1981-11-18 Siemens Aktiengesellschaft Motion detection device
EP0067313A1 (en) * 1981-06-15 1982-12-22 Cerberus Ag Smoke detector with a pulse-actuated radiation source
GB2124003A (en) * 1982-05-10 1984-02-08 Ainsworth Nominees Pty Ltd Door switch for a poker machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2157741A1 (en) * 1971-10-29 1973-06-08 Thomson Csf
FR2460012A1 (en) * 1979-06-27 1981-01-16 Hochiki Co PHOTOELECTRIC DETECTOR
EP0039799A1 (en) * 1980-05-09 1981-11-18 Siemens Aktiengesellschaft Motion detection device
EP0067313A1 (en) * 1981-06-15 1982-12-22 Cerberus Ag Smoke detector with a pulse-actuated radiation source
US4506161A (en) * 1981-06-15 1985-03-19 Cerberus Ag Smoke detector with a radiation source operated in a pulse-like or intermittent mode
GB2124003A (en) * 1982-05-10 1984-02-08 Ainsworth Nominees Pty Ltd Door switch for a poker machine

Also Published As

Publication number Publication date
NL6504092A (en) 1965-10-04

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