FR2235440A1 - Ultrasonic intruder detector system - has central unit which controls parallel emitters and has receivers triggering alarm - Google Patents
Ultrasonic intruder detector system - has central unit which controls parallel emitters and has receivers triggering alarmInfo
- Publication number
- FR2235440A1 FR2235440A1 FR7421086A FR7421086A FR2235440A1 FR 2235440 A1 FR2235440 A1 FR 2235440A1 FR 7421086 A FR7421086 A FR 7421086A FR 7421086 A FR7421086 A FR 7421086A FR 2235440 A1 FR2235440 A1 FR 2235440A1
- Authority
- FR
- France
- Prior art keywords
- receivers
- central unit
- detector system
- triggering alarm
- ultrasonic
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
- G08B13/1609—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems
- G08B13/1618—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Burglar Alarm Systems (AREA)
- Emergency Alarm Devices (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The central unit feeds the required frequency a.c. to the emitters of ultrasonic radiation and at the same time supplies the receivers which modulate the d.c. current with changes in the detected ultrasonic reflection. The latter are due to Doppler effect produced by the presence of an intruder within the field of emitted ultrasonic waves, and this in turn results in the generation of a warning signal. The receivers comprise a circuit for a.c. rectification connected as a supply for the strobing circuit, and the changes in the d.c. current are sensed by the central unit for tripping the alarm.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH945473A CH557070A (en) | 1973-06-28 | 1973-06-28 | PROCEDURE FOR GENERATING AN ALARM SIGNAL AND ALARM SYSTEM FOR CARRYING OUT THE PROCEDURE. |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2235440A1 true FR2235440A1 (en) | 1975-01-24 |
FR2235440B1 FR2235440B1 (en) | 1978-02-17 |
Family
ID=4352171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7421086A Granted FR2235440A1 (en) | 1973-06-28 | 1974-06-18 | Ultrasonic intruder detector system - has central unit which controls parallel emitters and has receivers triggering alarm |
Country Status (4)
Country | Link |
---|---|
JP (1) | JPS5513074B2 (en) |
CH (1) | CH557070A (en) |
DE (1) | DE2423185A1 (en) |
FR (1) | FR2235440A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3428773A1 (en) * | 1984-08-03 | 1986-02-13 | Siemens AG, 1000 Berlin und 8000 München | ULTRASONIC PROXIMITY INITIATOR |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2769972A (en) * | 1954-03-15 | 1956-11-06 | American District Telegraph Co | Method and apparatus for detecting motion |
CH502657A (en) * | 1968-09-05 | 1971-01-31 | Siemens Ag | Electroacoustic room surveillance system |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4427391Y1 (en) * | 1967-06-07 | 1969-11-15 |
-
1973
- 1973-06-28 CH CH945473A patent/CH557070A/en not_active IP Right Cessation
-
1974
- 1974-05-14 DE DE19742423185 patent/DE2423185A1/en not_active Withdrawn
- 1974-06-18 FR FR7421086A patent/FR2235440A1/en active Granted
- 1974-06-18 JP JP6881274A patent/JPS5513074B2/ja not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2769972A (en) * | 1954-03-15 | 1956-11-06 | American District Telegraph Co | Method and apparatus for detecting motion |
CH502657A (en) * | 1968-09-05 | 1971-01-31 | Siemens Ag | Electroacoustic room surveillance system |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3428773A1 (en) * | 1984-08-03 | 1986-02-13 | Siemens AG, 1000 Berlin und 8000 München | ULTRASONIC PROXIMITY INITIATOR |
Also Published As
Publication number | Publication date |
---|---|
JPS5513074B2 (en) | 1980-04-05 |
JPS5039099A (en) | 1975-04-10 |
FR2235440B1 (en) | 1978-02-17 |
DE2423185A1 (en) | 1975-01-16 |
CH557070A (en) | 1974-12-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |