GB8406694D0 - Inductive loop presence detectors - Google Patents

Inductive loop presence detectors

Info

Publication number
GB8406694D0
GB8406694D0 GB848406694A GB8406694A GB8406694D0 GB 8406694 D0 GB8406694 D0 GB 8406694D0 GB 848406694 A GB848406694 A GB 848406694A GB 8406694 A GB8406694 A GB 8406694A GB 8406694 D0 GB8406694 D0 GB 8406694D0
Authority
GB
United Kingdom
Prior art keywords
inductive loop
presence detectors
loop presence
detectors
inductive
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
Application number
GB848406694A
Other versions
GB2138613B (en
GB2138613A (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.)
Sarasota Automation Ltd
Original Assignee
Sarasota Automation Ltd
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 Sarasota Automation Ltd filed Critical Sarasota Automation Ltd
Priority to GB08406694A priority Critical patent/GB2138613B/en
Publication of GB8406694D0 publication Critical patent/GB8406694D0/en
Publication of GB2138613A publication Critical patent/GB2138613A/en
Application granted granted Critical
Publication of GB2138613B publication Critical patent/GB2138613B/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/952—Proximity switches using a magnetic detector using inductive coils
    • H03K17/9537—Proximity switches using a magnetic detector using inductive coils in a resonant circuit
    • H03K17/9542—Proximity switches using a magnetic detector using inductive coils in a resonant circuit forming part of an oscillator
    • H03K17/9545—Proximity switches using a magnetic detector using inductive coils in a resonant circuit forming part of an oscillator with variable frequency
GB08406694A 1983-03-16 1984-03-14 Inductive loop sensor Expired GB2138613B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08406694A GB2138613B (en) 1983-03-16 1984-03-14 Inductive loop sensor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8307280 1983-03-16
GB08406694A GB2138613B (en) 1983-03-16 1984-03-14 Inductive loop sensor

Publications (3)

Publication Number Publication Date
GB8406694D0 true GB8406694D0 (en) 1984-04-18
GB2138613A GB2138613A (en) 1984-10-24
GB2138613B GB2138613B (en) 1986-04-30

Family

ID=26285537

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08406694A Expired GB2138613B (en) 1983-03-16 1984-03-14 Inductive loop sensor

Country Status (1)

Country Link
GB (1) GB2138613B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH069336B2 (en) * 1987-04-03 1994-02-02 本田技研工業株式会社 High frequency oscillation type proximity switch
US5089815A (en) * 1987-05-08 1992-02-18 Detector Systems, Inc. Vehicle communication system using existing roadway loops
EP0290161A3 (en) * 1987-05-08 1989-06-28 Detector Systems Inc. Vehicle communication system using roadway loops
US4996716A (en) * 1987-12-28 1991-02-26 Detector Systems, Inc. Vehicle communication system using existing roadway loops
GB2385138B (en) * 2002-10-02 2004-02-04 Golden River Traffic Ltd Verification of loop sensing devices
US7324014B2 (en) 2003-03-11 2008-01-29 The Chamberlain Group, Inc. Inductive loop detector with automatic frequency change
WO2010136836A1 (en) * 2009-05-28 2010-12-02 Lorenzo Carpineto Sensor, particularly for detecting metals
ES2823373B8 (en) 2020-12-18 2023-10-26 Univ Valencia Politecnica SYSTEM AND METHOD FOR MONITORING PERSONAL MOBILITY VEHICLES IN URBAN ENVIRONMENTS

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205352A (en) * 1961-08-04 1965-09-07 Gen Precision Inc Presence detector
GB1271643A (en) * 1968-07-18 1972-04-19 Plessey Co Ltd Improvements in or relating to inductive loop detector systems
BE751108R (en) * 1969-06-06 1970-11-03 Berliet Automobiles DEVICE FOR THE PRECISE MEASUREMENT OF THE SPECIFIC CONSUMPTION OF COMBUSTION ENGINES
GB1482976A (en) * 1975-06-09 1977-08-17 Spencer P Metal detectors
GB1488847A (en) * 1975-11-28 1977-10-12 Servotron Instr Ltd Detection and location of conductors carrying time varying currents
GB2065946B (en) * 1979-11-21 1983-08-24 Redland Automation Ltd Vehicle detiction installation

Also Published As

Publication number Publication date
GB2138613B (en) 1986-04-30
GB2138613A (en) 1984-10-24

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20010314