GB1510034A - Magnetic object detection device - Google Patents

Magnetic object detection device

Info

Publication number
GB1510034A
GB1510034A GB3063676A GB3063676A GB1510034A GB 1510034 A GB1510034 A GB 1510034A GB 3063676 A GB3063676 A GB 3063676A GB 3063676 A GB3063676 A GB 3063676A GB 1510034 A GB1510034 A GB 1510034A
Authority
GB
United Kingdom
Prior art keywords
count
wheel
counter
core
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
GB3063676A
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.)
Computer Identics Corp
Original Assignee
Computer Identics Corp
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 Computer Identics Corp filed Critical Computer Identics Corp
Priority to GB3063676A priority Critical patent/GB1510034A/en
Publication of GB1510034A publication Critical patent/GB1510034A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
    • B61L1/02—Electric devices associated with track, e.g. rail contacts
    • B61L1/08—Electric devices associated with track, e.g. rail contacts magnetically actuated; electrostatically actuated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
    • B61L1/02—Electric devices associated with track, e.g. rail contacts
    • B61L1/10—Electric devices associated with track, e.g. rail contacts actuated by electromagnetic radiation; actuated by particle radiation
    • 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
    • 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
    • H03K17/9515—Proximity switches using a magnetic detector using non-linear magnetic devices
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Electromagnetism (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Geology (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Nonlinear Science (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Abstract

1510034 Proximity detectors COMPUTER IDENTICS CORP 22 July 1976 30636/76 Heading GIN [ Also in Division B7] In a rail vehicle wheel detector, the core 16 of a sensing coil 18 disposed adjacent rail 20 is saturated by the field from magnet 12 except when a wheel diverts some of the magnet field and the change in permeability of the core as it changes from saturated to unsaturated state and vice versa and hence the change in coil inductance is detected as a change in frequency of an oscillator circuit 60 of which the coil forms a part. The output from oscillator 60 is counted in counter 66 for successive periods determined by a second counter 74 fed with fixed frequency pulses from reference oscillator 72. Counter 74 via flipflop 76 gates counter 66 on at count T0 and off at T7. The counter 66 provides an output pulse at count 80 and when the core is saturated its permeability is low and the resulting low coil inductance produces an output signal of sufficiently high frequency for the counter to count up to 80 during its gated-on period. This signal at count T8 from counter 74 sets or resets flip-flop 112 to provide a no-wheel signal 119. At count T9 the system is reset for the next count starting at count T0. With a wheel present the core is unsaturated, its permeability rises and the increase in inductance lowers the operating frequency of the oscillator so that count 80 is not reached in the set period and flip-flop 114 is changed over to provide a wheel present indication. To prevent dither when the wheel is moving into and out of the zone of ingluence of the detector, a suppression circuit Fig. 7 (not shown) can be provided to ensure that the wheel present signal is given when the count drops below 80 and is not changed over to wheel absent until the count rises to 90. Two wheel detectors can be provided in succession along the track, Fig. 9 (not shown) and these can be connected to a circuit which additionally provides an indication of the direction of wheel movement.
GB3063676A 1976-07-22 1976-07-22 Magnetic object detection device Expired GB1510034A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3063676A GB1510034A (en) 1976-07-22 1976-07-22 Magnetic object detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3063676A GB1510034A (en) 1976-07-22 1976-07-22 Magnetic object detection device

Publications (1)

Publication Number Publication Date
GB1510034A true GB1510034A (en) 1978-05-10

Family

ID=10310737

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3063676A Expired GB1510034A (en) 1976-07-22 1976-07-22 Magnetic object detection device

Country Status (1)

Country Link
GB (1) GB1510034A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033800A2 (en) * 1980-02-04 1981-08-19 Caterpillar Tractor Co. Motion sensing system
FR2606163A1 (en) * 1986-10-29 1988-05-06 Baumer Electric Ag METHOD FOR NON-CONTACT DETECTION OF BODIES SURROUNDED BY FOUCAULT CURRENTS, IN PARTICULAR METALLIC OBJECTS, AND DETECTORS THAT RELY ON THE PROCESS
EP0459478A2 (en) * 1990-06-01 1991-12-04 Harro Prof.Dipl.-Ing. Müller-Stürcken Apparatus determining the relative movement of metal with respect to a metal sensitive detector arrangement
EP0478856A1 (en) * 1990-10-01 1992-04-08 Siemens Aktiengesellschaft Österreich Method and device for controlling the activation of a touch plate
EP0551606A2 (en) * 1992-01-11 1993-07-21 Robert Bosch Gmbh Metal detector
EP1152533A1 (en) * 2000-05-02 2001-11-07 Schneider Electric Industries SA Inductive or capacitive detector
US6984994B2 (en) 2000-03-14 2006-01-10 Isis Innovation Limited Position and electromagnetic field sensor
EP2378316A1 (en) * 2010-04-14 2011-10-19 M.d. Micro Detectors S.p.a. Inductive sensor whose output is independent of the type of detectable metallic material
CN101434248B (en) * 2007-11-16 2012-05-02 胡兴福 Series cab signal two-way receiver coil
CN114340971A (en) * 2019-07-05 2022-04-12 构建互联有限公司 Device for detecting wheels on a rail

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033800A2 (en) * 1980-02-04 1981-08-19 Caterpillar Tractor Co. Motion sensing system
EP0033800A3 (en) * 1980-02-04 1981-08-26 Caterpillar Tractor Co. Motion sensing system
FR2606163A1 (en) * 1986-10-29 1988-05-06 Baumer Electric Ag METHOD FOR NON-CONTACT DETECTION OF BODIES SURROUNDED BY FOUCAULT CURRENTS, IN PARTICULAR METALLIC OBJECTS, AND DETECTORS THAT RELY ON THE PROCESS
EP0459478A2 (en) * 1990-06-01 1991-12-04 Harro Prof.Dipl.-Ing. Müller-Stürcken Apparatus determining the relative movement of metal with respect to a metal sensitive detector arrangement
EP0459478A3 (en) * 1990-06-01 1992-05-27 Harro Prof.Dipl.-Ing. Mueller-Stuercken Apparatus determining the relative movement of metal with respect to a metal sensitive detector arrangement
EP0478856A1 (en) * 1990-10-01 1992-04-08 Siemens Aktiengesellschaft Österreich Method and device for controlling the activation of a touch plate
EP0551606A2 (en) * 1992-01-11 1993-07-21 Robert Bosch Gmbh Metal detector
EP0551606A3 (en) * 1992-01-11 1993-10-20 Bosch Gmbh Robert Metal detector
US6984994B2 (en) 2000-03-14 2006-01-10 Isis Innovation Limited Position and electromagnetic field sensor
EP1152533A1 (en) * 2000-05-02 2001-11-07 Schneider Electric Industries SA Inductive or capacitive detector
FR2808597A1 (en) * 2000-05-02 2001-11-09 Schneider Electric Ind Sa INDUCTIVE OR CAPACITIVE DETECTOR
US6518776B2 (en) 2000-05-02 2003-02-11 Schneider Electric Industries Sa Inductive or capacitive detector
CN101434248B (en) * 2007-11-16 2012-05-02 胡兴福 Series cab signal two-way receiver coil
EP2378316A1 (en) * 2010-04-14 2011-10-19 M.d. Micro Detectors S.p.a. Inductive sensor whose output is independent of the type of detectable metallic material
CN114340971A (en) * 2019-07-05 2022-04-12 构建互联有限公司 Device for detecting wheels on a rail

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee