GB466925A - Improvements in and relating to magnetic testing devices - Google Patents

Improvements in and relating to magnetic testing devices

Info

Publication number
GB466925A
GB466925A GB16875/36A GB1687536A GB466925A GB 466925 A GB466925 A GB 466925A GB 16875/36 A GB16875/36 A GB 16875/36A GB 1687536 A GB1687536 A GB 1687536A GB 466925 A GB466925 A GB 466925A
Authority
GB
United Kingdom
Prior art keywords
magnetic
cores
flaw
june
amplifier
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
GB16875/36A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB466925A publication Critical patent/GB466925A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

466,925. Magnetic tests. BRITISH THOMSON-HOUSTON CO., Ltd. June 17, 1936, No. 16875. Convention date, June 20, 1935. [Class 37] Tests for flaws in magnetic material are effected by two saturated magnetic cores 14, 15 in proximity to the material, the outer legs of each core being energized in opposite directions by windings 22 ... 25 fed from an A.C. source 26, the response to a flaw being obtained by an unsymmetric joint action of a magnetic field around the material and the field of the cores. Continuous-current is passed through a rail under test by source 12 through brushes 13. Normally the fluxes due to the main current in the centre legs 16, 17 of cores 14, 15, at fundamental frequency and odd harmonics are opposed, but the components due to even harmonics at saturation are additive and induce voltages in the secondary windings 27, 28. These, voltages are opposed and cancel in the absence of a flaw and are applied to an amplifier 29 which may be tuned to the second harmonic frequency. The output of the amplifier may be connected to a faulty recorder 30 or point gun marker 31.
GB16875/36A 1935-06-20 1936-06-17 Improvements in and relating to magnetic testing devices Expired GB466925A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US466925XA 1935-06-20 1935-06-20

Publications (1)

Publication Number Publication Date
GB466925A true GB466925A (en) 1937-06-08

Family

ID=21944863

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16875/36A Expired GB466925A (en) 1935-06-20 1936-06-17 Improvements in and relating to magnetic testing devices

Country Status (1)

Country Link
GB (1) GB466925A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0376095A1 (en) * 1988-12-15 1990-07-04 Nkk Corporation Magnetic flux measuring method and apparatus for embodying the same
WO2003029805A1 (en) * 2001-09-28 2003-04-10 Em-Tech Llc Magnetic lensing
EP3477294A4 (en) * 2016-06-28 2020-02-12 Hitachi High-tech Fine Systems Corporation Rail inspection system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0376095A1 (en) * 1988-12-15 1990-07-04 Nkk Corporation Magnetic flux measuring method and apparatus for embodying the same
WO2003029805A1 (en) * 2001-09-28 2003-04-10 Em-Tech Llc Magnetic lensing
EP3477294A4 (en) * 2016-06-28 2020-02-12 Hitachi High-tech Fine Systems Corporation Rail inspection system

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