GB942848A - Improvements in or relating to warning devices - Google Patents

Improvements in or relating to warning devices

Info

Publication number
GB942848A
GB942848A GB2380961A GB2380961A GB942848A GB 942848 A GB942848 A GB 942848A GB 2380961 A GB2380961 A GB 2380961A GB 2380961 A GB2380961 A GB 2380961A GB 942848 A GB942848 A GB 942848A
Authority
GB
United Kingdom
Prior art keywords
flop
flip
geophone
june
fronted
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
GB2380961A
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.)
CGG SA
Original Assignee
Compagnie Generale de Geophysique SA
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 Compagnie Generale de Geophysique SA filed Critical Compagnie Generale de Geophysique SA
Publication of GB942848A publication Critical patent/GB942848A/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
    • G08B13/22—Electrical actuation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/001—Acoustic presence detection
    • 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
    • G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
    • G08B13/1663—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using seismic sensing means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Remote Sensing (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

942,848. Intruder detection systems. COMPAGNIE GENERALE DE GEOPHYSIQUE. June 30, 1961 [June 30, 1960], No. 23809/61. Heading G4N. An intruder detection system in which a geophone is buried in the ground and attached either to a metal plate or a wire, the arrangement being such that the system discriminates against parasitic noise signals and the alarm is operated only by the steep fronted geophone output signals produced by the steps of an intruder. The geophone output is fed through parallel channels to flip-flop 14, one channel including an integrator 18 which acts as a delay device. The difference in the channel outputs determines the triggering of the flip-flop 14, so that in the case of a steep-fronted geophone output signal the difference will be sufficient to trigger the flip-flop and not sufficient in the case of parasitic signals.
GB2380961A 1960-06-30 1961-06-30 Improvements in or relating to warning devices Expired GB942848A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR831580A FR1269273A (en) 1960-06-30 1960-06-30 Improvements to electrical monitoring and alarm systems

Publications (1)

Publication Number Publication Date
GB942848A true GB942848A (en) 1963-11-27

Family

ID=8734535

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2380961A Expired GB942848A (en) 1960-06-30 1961-06-30 Improvements in or relating to warning devices

Country Status (5)

Country Link
CH (1) CH373284A (en)
DE (1) DE1249126B (en)
FR (1) FR1269273A (en)
GB (1) GB942848A (en)
NL (2) NL266481A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3258762A (en) * 1966-06-28 Bistable multivibrator means
US3273138A (en) * 1964-04-28 1966-09-13 Sonus Corp Swimming pool monitor
FR2177084A1 (en) * 1972-03-23 1973-11-02 Texas Industries Inc
GB2118342A (en) * 1982-04-08 1983-10-26 Elsec Electronic Security Syst Intrusion detector
US4928085A (en) * 1983-02-23 1990-05-22 Bluegrass Electronics, Inc. Pressure change intrusion detector
US5185593A (en) * 1983-02-23 1993-02-09 Bluegrass Electronics, Inc. Dual pressure change intrusion detector
FR2804530A1 (en) * 2000-01-28 2001-08-03 Conseil En Technologies Innova Intrusion detector for swimming pools has microphone in gravel trench prevents children drowning

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3296587A (en) * 1963-02-20 1967-01-03 Texas Instruments Inc Intrusion detector system
GB1573446A (en) * 1976-03-16 1980-08-20 Elliott Bros Intruder alarm systems
FR2556860B1 (en) * 1983-12-16 1986-04-11 Thomson Csf INTRUDER DETECTION DEVICE

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3258762A (en) * 1966-06-28 Bistable multivibrator means
US3273138A (en) * 1964-04-28 1966-09-13 Sonus Corp Swimming pool monitor
FR2177084A1 (en) * 1972-03-23 1973-11-02 Texas Industries Inc
GB2118342A (en) * 1982-04-08 1983-10-26 Elsec Electronic Security Syst Intrusion detector
US4928085A (en) * 1983-02-23 1990-05-22 Bluegrass Electronics, Inc. Pressure change intrusion detector
US5185593A (en) * 1983-02-23 1993-02-09 Bluegrass Electronics, Inc. Dual pressure change intrusion detector
USRE34788E (en) * 1983-02-23 1994-11-15 Blue Grass Electronics, Inc. Pressure change intrusion detector
FR2804530A1 (en) * 2000-01-28 2001-08-03 Conseil En Technologies Innova Intrusion detector for swimming pools has microphone in gravel trench prevents children drowning

Also Published As

Publication number Publication date
FR1269273A (en) 1961-08-11
DE1249126B (en)
NL137413C (en)
CH373284A (en) 1963-11-15
NL266481A (en)

Similar Documents

Publication Publication Date Title
GB1342552A (en) Intruder detection systems
GB1388353A (en) Intrusion detection system
GB942848A (en) Improvements in or relating to warning devices
GB1295498A (en)
GB1225886A (en)
GB763196A (en) Moving target indicator pulse radar systems
ES426923A1 (en) Intrusion detector
GB1357942A (en) Frequency shift keyed data receiving means and discriminators which can be used in such receiving means
GB1181564A (en) Self-Clocking Record Sensing System.
GB1392819A (en) Audio signal level-indicating devices
JPS5244588A (en) Disturbance detection system
GB982481A (en) Road and air vehicle detection system
GB1137038A (en) A vehicle presence detector
GB1236510A (en) Improvements in or relating to signal receiving systems
GB1331369A (en) Malfunction detection circuit blocking transmission of signals when the difference exceeds a predetermined value
GB1186673A (en) Improvements in or relating to Systems for Detecting the Presence of Objects in a Monitored Area
GB1024143A (en) Underwater practice mine
GB1145244A (en) Improvements in or relating to i.l.s. monitor systems
GB1230373A (en)
GB1390606A (en) Vehilce detector systems
GB1304393A (en)
GB1160496A (en) A Photosensitively Triggered Sound Producing Apparatus.
Simakhin Nonparametric signal detectors in the case of dependent sampled magnitudes
GB1299631A (en) Magnetic mine sensing system
GB1139600A (en) Electrical protection system