GB1338062A - Prescence detector - Google Patents

Prescence detector

Info

Publication number
GB1338062A
GB1338062A GB4912670A GB4912670A GB1338062A GB 1338062 A GB1338062 A GB 1338062A GB 4912670 A GB4912670 A GB 4912670A GB 4912670 A GB4912670 A GB 4912670A GB 1338062 A GB1338062 A GB 1338062A
Authority
GB
United Kingdom
Prior art keywords
transistor
automobile
capacitor
loop
oscillator
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
GB4912670A
Other languages
English (en)
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.)
Wilcox M F
Original Assignee
Wilcox M F
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 Wilcox M F filed Critical Wilcox M F
Publication of GB1338062A publication Critical patent/GB1338062A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
    • G01V3/101—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils by measuring the impedance of the search coil; by measuring features of a resonant circuit comprising the search coil
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors

Landscapes

  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Electromagnetism (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Devices For Checking Fares Or Tickets At Control Points (AREA)
  • Traffic Control Systems (AREA)
GB4912670A 1970-01-07 1971-01-06 Prescence detector Expired GB1338062A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US123170A 1970-01-07 1970-01-07

Publications (1)

Publication Number Publication Date
GB1338062A true GB1338062A (en) 1973-11-21

Family

ID=21695019

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4912670A Expired GB1338062A (en) 1970-01-07 1971-01-06 Prescence detector

Country Status (3)

Country Link
US (1) US3683351A (https=)
FR (1) FR2074878A5 (https=)
GB (1) GB1338062A (https=)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491841A (en) * 1981-04-03 1985-01-01 Sarasota Automation Limited Self-adjusting inductive object-presence detector
US4568937A (en) * 1982-06-03 1986-02-04 Microsense Systems, Limited Induction loop vehicle detector

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8424096D0 (en) * 1984-09-24 1984-10-31 Buttemer D A Inductive loop detector
GB8709465D0 (en) * 1987-04-22 1987-05-28 Watkiss Automation Ltd Sensor
US5148149A (en) * 1991-01-31 1992-09-15 Allied Security Devices, Inc. Differential delay intrusion detection sensory system
JP3692548B2 (ja) * 1994-09-19 2005-09-07 株式会社セガ 物体の面を検出する装置及びゲーム装置
FR2738643B1 (fr) * 1995-09-08 1997-12-26 Schneider Electric Sa Detecteur de proximite inductif universel
US5936523A (en) * 1998-04-24 1999-08-10 West; Joe F. Device and method for detecting unwanted disposition of the contents of an enclosure
FR2860327B1 (fr) * 2003-09-25 2007-06-15 Ct D Etudes Tech De L Equipeme Dispositif permettant une detection selective du passage d'un vehicule de type velo sur une voie de circulation a un endroit determine.
JP4336219B2 (ja) * 2004-02-20 2009-09-30 株式会社ユーシン 人体検知センサ
US7656169B2 (en) * 2007-02-06 2010-02-02 Iee International Electronics & Engineering S.A. Capacitive occupant detection system
JP5471587B2 (ja) * 2010-02-25 2014-04-16 トヨタ紡織株式会社 乗員検知システム及び乗員検知システムの制御方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1317628A (https=) * 1961-03-13 1963-05-08
US3222664A (en) * 1962-12-03 1965-12-07 Honeywell Inc Detection apparatus
US3266028A (en) * 1963-03-09 1966-08-09 Ferranti Packard Ltd Vehicle detector with capacitor storage element
US3260991A (en) * 1963-03-20 1966-07-12 American District Telegraph Co Apparatus for detecting motion and objects
US3355658A (en) * 1965-12-06 1967-11-28 Robert F Gardiner Differentiating metal detector for detecting metal objects and distinguishing between detected diamagnetic and non-diamagnetic objects
US3436725A (en) * 1966-01-03 1969-04-01 Crouse Hinds Co Loop detector
US3500310A (en) * 1966-03-29 1970-03-10 Rca Corp True presence vehicle detector including means to distinguish between slow ambient changes and changes due to the presence of a vehicle
US3397364A (en) * 1967-05-24 1968-08-13 Small Business Administ Inductive loop metallic object detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491841A (en) * 1981-04-03 1985-01-01 Sarasota Automation Limited Self-adjusting inductive object-presence detector
US4568937A (en) * 1982-06-03 1986-02-04 Microsense Systems, Limited Induction loop vehicle detector

Also Published As

Publication number Publication date
US3683351A (en) 1972-08-08
FR2074878A5 (https=) 1971-10-08

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLE Entries relating assignments, transmissions, licences in the register of patents
PE20 Patent expired after termination of 20 years