GB1439325A - Alarm detectors - Google Patents

Alarm detectors

Info

Publication number
GB1439325A
GB1439325A GB2126872A GB2126872A GB1439325A GB 1439325 A GB1439325 A GB 1439325A GB 2126872 A GB2126872 A GB 2126872A GB 2126872 A GB2126872 A GB 2126872A GB 1439325 A GB1439325 A GB 1439325A
Authority
GB
United Kingdom
Prior art keywords
photo
detectors
light source
diode
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
GB2126872A
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.)
KGM Electronics Ltd
Original Assignee
KGM Electronics 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 KGM Electronics Ltd filed Critical KGM Electronics Ltd
Priority to GB2126872A priority Critical patent/GB1439325A/en
Publication of GB1439325A publication Critical patent/GB1439325A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G08B13/187—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 interference of a radiation field
    • 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
    • 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
    • G08B17/107—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 for detecting light-scattering due to smoke
    • 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
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details

Abstract

1439325 Photo-electric surveillance unit KGM ELECTRONICS Ltd 6 Aug 1973 [6 May 1972] 21268/72 Heading G1A [Also in Division G4] A smoke, fire or intruder alarm system comprises a detector unit 1 including a light source 2 adjacent a lens 3 forming by way of mirror 4 an image of an area under surveillance and a set of photo-diode detectors 6 positioned in the image plane of the lens to form images of a plurality of retro-reflectors disposed in the area under surveillance. If one or more of the photo-diodes provides an output signal indicating a retroreflector is obscured a relay coil (RL2) Fig. 2 (not shown), is deactuated to give an alarm. A further photo-diode is connected in the opposite sense to the others and causes relay (RL2) to drop out if an obstruction in front of the detector unit reflects back to all the detectors. A yet further photo-diode detector monitors the output of the light source by way of optical fibre bundle 7 and controls the sensitivity of the other detectors accordingly, to compensate for the lamp ageing for example, whilst failure of the light source is indicated by operation of relay (RL1). The sensitivities of the integrated circuits forming, with the photo-diodes, the detectors, are individually adjustable by means of variable resistors. It is stated that the detectors may be used with a C.C.T.V. system and that when so used the detector output may be used to select and or energise T.V. cameras and or lighting equipment to conserve the life thereof and direct attention to the area concerned.
GB2126872A 1972-05-06 1972-05-06 Alarm detectors Expired GB1439325A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2126872A GB1439325A (en) 1972-05-06 1972-05-06 Alarm detectors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2126872A GB1439325A (en) 1972-05-06 1972-05-06 Alarm detectors

Publications (1)

Publication Number Publication Date
GB1439325A true GB1439325A (en) 1976-06-16

Family

ID=10160046

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2126872A Expired GB1439325A (en) 1972-05-06 1972-05-06 Alarm detectors

Country Status (1)

Country Link
GB (1) GB1439325A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2141228A (en) * 1983-06-09 1984-12-12 Shorrock Security Systems Ltd Infra-red intrusion detector
EP0499177A1 (en) * 1991-02-11 1992-08-19 BITRON VIDEO S.r.l. Anti-intrusion device
EP2093731A1 (en) * 2008-02-19 2009-08-26 Siemens Aktiengesellschaft Linear optical smoke alarm with multiple part-beams
EP2093734A1 (en) * 2008-02-19 2009-08-26 Siemens Aktiengesellschaft Smoke alarm with timed evaluation of a backscattering signal, test method for functionality of a smoke alarm

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2141228A (en) * 1983-06-09 1984-12-12 Shorrock Security Systems Ltd Infra-red intrusion detector
EP0499177A1 (en) * 1991-02-11 1992-08-19 BITRON VIDEO S.r.l. Anti-intrusion device
EP2093731A1 (en) * 2008-02-19 2009-08-26 Siemens Aktiengesellschaft Linear optical smoke alarm with multiple part-beams
EP2093734A1 (en) * 2008-02-19 2009-08-26 Siemens Aktiengesellschaft Smoke alarm with timed evaluation of a backscattering signal, test method for functionality of a smoke alarm
WO2009103667A1 (en) * 2008-02-19 2009-08-27 Siemens Aktiengesellschaft Smoke alarm with temporal evaluation of a backscatter signal, test method for the functional capability of a smoke alarm
CN101952862B (en) * 2008-02-19 2013-04-10 西门子公司 Smoke alarm with temporal evaluation of a backscatter signal, test method for the functional capability of a smoke alarm
US8587442B2 (en) 2008-02-19 2013-11-19 Siemens Aktiengesellschaft Smoke alarm with temporal evaluation of a backscatter signal, test method for the functional capability of a smoke alarm

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee