GB972171A - Intruder alarms - Google Patents
Intruder alarmsInfo
- Publication number
- GB972171A GB972171A GB39156/62D GB3915662D GB972171A GB 972171 A GB972171 A GB 972171A GB 39156/62 D GB39156/62 D GB 39156/62D 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
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
- G08B13/183—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
-
- 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
- G08B13/189—Actuation 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
- G08B13/1895—Actuation 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
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.
Applications Claiming Priority (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 |
---|---|---|---|
GB39156/62D 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)
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 (26)
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 |
DE1566703B1 (en) * | 1967-07-04 | 1970-12-17 | Hughes Aircraft Co | Photoelectric barrier |
US3476948A (en) * | 1968-02-19 | 1969-11-04 | Sylvania Electric Prod | Optical intrusion detection system using reflected dual beam peripheral scanning |
US3476946A (en) * | 1968-02-19 | 1969-11-04 | Sylvania Electric Prod | Optical intrusion detection system using dual beam peripheral scanning and light directing tubes |
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 8002 Zürich Wolf | Surveillance device with a camera |
US4659919A (en) * | 1983-03-28 | 1987-04-21 | Price William E | Optical sensing circuit for audio activation of toys |
US4675519A (en) * | 1983-03-28 | 1987-06-23 | Price William E | Toy having optically actuated sound generator |
SE441632B (en) * | 1984-04-05 | 1985-10-21 | Bert Jonsson | DEVICE FOR MOVING OBJECTS |
CN106801856A (en) * | 2017-02-10 | 2017-06-06 | 烟台职业学院 | Dim light suggestion device |
CN116466268B (en) * | 2023-06-19 | 2024-06-07 | 力高(山东)新能源技术股份有限公司 | Fault detection method, system and equipment for photosensitive sensor |
Family Cites Families (7)
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 |
-
1961
- 1961-11-22 US US154374A patent/US3191048A/en not_active Expired - Lifetime
-
1962
- 1962-10-18 GB GB39156/62D patent/GB972171A/en not_active Expired
Cited By (1)
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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