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GB974516A - Improvements in and relating to apparatus for detecting the presence of magnetic objects - Google Patents

Improvements in and relating to apparatus for detecting the presence of magnetic objects

Info

Publication number
GB974516A
GB974516A GB2939761A GB2939761A GB974516A GB 974516 A GB974516 A GB 974516A GB 2939761 A GB2939761 A GB 2939761A GB 2939761 A GB2939761 A GB 2939761A GB 974516 A GB974516 A GB 974516A
Authority
GB
United Kingdom
Prior art keywords
magnetic
detecting
magneto
aug
relating
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
GB2939761A
Inventor
Basil Amory Turner
George Owen Foot
Robert Gibbins
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.)
Cosmocord Ltd
Original Assignee
Cosmocord 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 Cosmocord Ltd filed Critical Cosmocord Ltd
Priority to GB2939761A priority Critical patent/GB974516A/en
Publication of GB974516A publication Critical patent/GB974516A/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
    • B61L1/16—Devices for counting axles; Devices for counting vehicles
    • B61L1/163—Detection devices
    • B61L1/165—Electrical

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

974,516. Locating magnetic bodies. COSMOCORD Ltd. Aug. 15, 1962 [Aug. 15, 1961], No. 29397/61. Heading G1N. A head for detecting the presence of an object of magnetic material, comprises a magnetic structure which includes two magnetic loops 16, 10, and 17, 11, Fig.1 each including a source of magnetic flux and an air gap, and a third magnetic loop including both the said sources 10, 11, and a semi-conductor element 14 in a gap between polepieces 12, 13, the arrangement being such that a change of reluctance in one of the gaps in one of the said two loops causes a change in the flux passing through the element 14. The element may be magneto-resistive or be a Hall plate, and screening may be provided on all faces except that adjacent the two gaps. A bridge circuit for a magneto-resistive element is described with reference to Fig. 2 (not shown).
GB2939761A 1961-08-15 1961-08-15 Improvements in and relating to apparatus for detecting the presence of magnetic objects Expired GB974516A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2939761A GB974516A (en) 1961-08-15 1961-08-15 Improvements in and relating to apparatus for detecting the presence of magnetic objects

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2939761A GB974516A (en) 1961-08-15 1961-08-15 Improvements in and relating to apparatus for detecting the presence of magnetic objects

Publications (1)

Publication Number Publication Date
GB974516A true GB974516A (en) 1964-11-04

Family

ID=10290932

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2939761A Expired GB974516A (en) 1961-08-15 1961-08-15 Improvements in and relating to apparatus for detecting the presence of magnetic objects

Country Status (1)

Country Link
GB (1) GB974516A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4086533A (en) * 1975-11-12 1978-04-25 U.S. Philips Corporation Hall effect apparatus for determining the angular position of a rotating part
US4088946A (en) * 1975-07-28 1978-05-09 Westinghouse Electric Corp. Magnetic bridge transducer formed with permanent magnets and a hall effect sensor for identifying the presence and location of ferromagnetic discontinuities within or on a tubular specimen
GB2207510A (en) * 1987-07-21 1989-02-01 Manchester Lasers Magnetic sensor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4088946A (en) * 1975-07-28 1978-05-09 Westinghouse Electric Corp. Magnetic bridge transducer formed with permanent magnets and a hall effect sensor for identifying the presence and location of ferromagnetic discontinuities within or on a tubular specimen
US4086533A (en) * 1975-11-12 1978-04-25 U.S. Philips Corporation Hall effect apparatus for determining the angular position of a rotating part
GB2207510A (en) * 1987-07-21 1989-02-01 Manchester Lasers Magnetic sensor
GB2207510B (en) * 1987-07-21 1991-12-18 Manchester Lasers Magnetic sensor

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