GB972171A - Intruder alarms - Google Patents

Intruder alarms

Info

Publication number
GB972171A
GB972171A GB3915662D GB3915662D GB972171A GB 972171 A GB972171 A GB 972171A GB 3915662 D GB3915662 D GB 3915662D GB 3915662 D GB3915662 D GB 3915662D GB 972171 A GB972171 A GB 972171A
Authority
GB
United Kingdom
Prior art keywords
bridge
supply
alarm
light
source
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
GB3915662D
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.)
US Atomic Energy Commission (AEC)
Original Assignee
US Atomic Energy Commission (AEC)
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
Priority to US154374A priority Critical patent/US3191048A/en
Application filed by US Atomic Energy Commission (AEC) filed Critical US Atomic Energy Commission (AEC)
Publication of GB972171A publication Critical patent/GB972171A/en
Application status is Expired legal-status Critical

Links

Classifications

    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/18Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength
    • G08B13/181Actuation 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
    • G08B13/183Actuation 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
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/18Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength
    • G08B13/189Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/1895Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength using passive radiation detection systems using light change detection systems

Abstract

972, 171. Electric bridge circuits. UNITED STATES ATOMIC ENERGY COMMISSION. Oct. 18, 1962 [Nov. 22, 1961], No. 39516/62. Heading G1U. [Also in Division G4] An intruder alarm system (for use in an enclosure) includes a single source of light energy 1 (Fig. 1) and several pairs of light sensitive detectors 2, connected in a bridge circuit energized from a D.C. source such that the individual members of each pair are in opposite arms of the bridge. An alarm is connected across the bridge to respond to out of balance conditions. The system is such that the output voltage is independent of variations in the light or voltage sources, but is very sensitive to interruption or variation in light intensity at one pair of detectors. In the first described embodiment (Fig. 2) the D.C. supply is derived by rectifying and smoothing an A.C. supply 10, 11, a suitable voltage being tapped from the potentiometer 22. The supply circuit includes a relay coil 24 which actuates the contacts 25 and hence an indicator 27 in the event of a supply failure. The bridge may be composed of pairs of photoresistors or cadmium sulphide cells 30, 31 and 32, 33 and any out of balance condition, caused by interference with the light pattern at one of the pairs, actuates the relay coil 34 and hence the contacts 37 and the alarm 38. Any failure of the light source affects all pairs equally and so the intruder alarm does not operate, but the increased impedance of the bridge can be utilized to operate relay 24, so that this will indicate failure of the bridge supply sources. If the alarm actuating source 26 is a battery it can be connected into the circuit across the leads 23, 29 so as to act as an auxiliary supply in the event of a mains voltage failure. A second embodiment (Fig. 3) is battery powered and is arranged to extend the battery life by using the battery 40 to energize a free running multivibrator 45 which pulses the light source 47 intermittently. The bridge and alarm circuits are also energized from the same source.
GB3915662D 1961-11-22 1962-10-18 Intruder alarms Expired GB972171A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US154374A US3191048A (en) 1961-11-22 1961-11-22 Light sensitive alarm system

Publications (1)

Publication Number Publication Date
GB972171A true GB972171A (en) 1964-10-07

Family

ID=22551110

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3915662D Expired GB972171A (en) 1961-11-22 1962-10-18 Intruder alarms

Country Status (2)

Country Link
US (1) US3191048A (en)
GB (1) GB972171A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169731A (en) * 1985-01-14 1986-07-16 Jnr Robert Mcnair Foam injection detector

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3335285A (en) * 1964-03-24 1967-08-08 Jr John Gally Photoelectric system for detecting objects in a zone including vibrating light source
US3396279A (en) * 1964-04-17 1968-08-06 Kinkohsha Insatsu Kabushiki Ka Apparatus for detecting passage of moving objects
US3309689A (en) * 1964-10-30 1967-03-14 Sylvania Electric Prod Intrusion detection system
US3370284A (en) * 1965-01-21 1968-02-20 Samuel M. Bagno Optical space alarm
US3436554A (en) * 1965-12-30 1969-04-01 Sylvania Electric Prod Radiation sensitive intrusion detection system
US3466643A (en) * 1966-03-18 1969-09-09 Carlton Swain Moorefield Transmission line tampering alarm system
US3370285A (en) * 1966-04-06 1968-02-20 Santa Barbara Res Ct Detection system
US3488436A (en) * 1966-09-29 1970-01-06 Sylvania Electric Prod Intrusion detector control for closed circuit television system
US3444384A (en) * 1966-11-07 1969-05-13 Geza E Horeczky Motion selector using ratio of responses of two photoelectric cells
US3534351A (en) * 1967-04-07 1970-10-13 Gen Electric Light coupled battery powered remote control apparatus
DE1566703B (en) * 1967-07-04 1970-12-17 Hughes Aircraft Co Photoelectric barrier
US3476946A (en) * 1968-02-19 1969-11-04 Sylvania Electric Prod Optical intrusion detection system using dual beam peripheral scanning and light directing tubes
US3476948A (en) * 1968-02-19 1969-11-04 Sylvania Electric Prod Optical intrusion detection system using reflected dual beam peripheral scanning
US3535528A (en) * 1968-06-11 1970-10-20 Glenn G Strickland Radiation sensitive passive binocular motion detector
US3628062A (en) * 1969-12-08 1971-12-14 Honeywell Inc Limit control apparatus with momentary power failure bridge
US3758775A (en) * 1971-09-29 1973-09-11 Department Of Transportion Railroad crossing signalling system
US3938138A (en) * 1973-06-19 1976-02-10 Sony Corporation Time switching power saver system for electronic indicators
US3932849A (en) * 1974-06-24 1976-01-13 General Electric Company Self-contained, condition responsive circuit
CH592931A5 (en) * 1976-03-18 1977-11-15 Cerberus Ag
US4317992A (en) * 1979-12-10 1982-03-02 Honeywell Inc. Object detecting apparatus
DE3110851A1 (en) * 1981-03-20 1982-09-30 Max Wolf Surveillance device with a camera
US4675519A (en) * 1983-03-28 1987-06-23 Price William E Toy having optically actuated sound generator
US4659919A (en) * 1983-03-28 1987-04-21 Price William E Optical sensing circuit for audio activation of toys
SE441632B (en) * 1984-04-05 1985-10-21 Bert Jonsson Apparatus for detecting moving objects

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191121262A (en) * 1911-09-26 1912-06-27 Arthur Bing Improvements in and connected with Burglar Alarm Devices.
US1922188A (en) * 1927-06-16 1933-08-15 Westinghouse Electric & Mfg Co Inspection device
US2060215A (en) * 1931-05-05 1936-11-10 American District Telegraph Co Electric temperature and burglar alarm system
US2269340A (en) * 1939-09-07 1942-01-06 Westinghouse Electric & Mfg Co Burglar alarm
US2872588A (en) * 1953-11-16 1959-02-03 Phillips Petroleum Co Analyzer
US3029345A (en) * 1958-07-25 1962-04-10 David W Douglas Electronic key-card system
US3056120A (en) * 1960-09-12 1962-09-25 Honeywell Regulator Co Supervised condition detection and alarm apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169731A (en) * 1985-01-14 1986-07-16 Jnr Robert Mcnair Foam injection detector

Also Published As

Publication number Publication date
US3191048A (en) 1965-06-22

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