GB1427703A - Magnetic testing apparatus - Google Patents

Magnetic testing apparatus

Info

Publication number
GB1427703A
GB1427703A GB5505271A GB5505271A GB1427703A GB 1427703 A GB1427703 A GB 1427703A GB 5505271 A GB5505271 A GB 5505271A GB 5505271 A GB5505271 A GB 5505271A GB 1427703 A GB1427703 A GB 1427703A
Authority
GB
United Kingdom
Prior art keywords
sheet
arrays
solenoid
yokes
magnetic
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
GB5505271A
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 Steel Corp
Original Assignee
British Steel 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 British Steel Corp filed Critical British Steel Corp
Priority to GB5505271A priority Critical patent/GB1427703A/en
Publication of GB1427703A publication Critical patent/GB1427703A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
    • G01R33/123—Measuring loss due to hysteresis
    • 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
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents

Landscapes

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

Abstract

1427703 Testing magnetic material BRITISH STEEL CORP 23 Feb 1973 [26 Nov 1971] 55052/71 Heading G1 In an arrangement for testing e.g. power loss in ferromagnetic strip material two arrays of spaced magnetic yokes are provided to reduce errors arising from eddy currents induced during testing in the strip. The sheet e.g. silicon bearing steel is passed through a central slot 8 in a hollow transverse member 6 in which is disposed a former 12 around which coaxial magnetizing solenoid 16 and sensing coil 18 are wound. Two arrays 20, 20' of yokes are provided adjacent each of the opposite faces of the sheet to complete the magnetic circuits including the sheet when solenoid 16 is A.C. energized. Due to the space 24 between the arrays 20, 20', which is greater than the distance between individual yokes, the magnetic circuits on either side of the space are isolated. This isolation produces a breakdown of eddy current induced in the sheet into a number of smaller independent circuits and reduces eddy current losses. The sensor coil 12 output and a signal representative of current flow in solenoid 16 are combined in a translation circuit to provide a visual indication of power losses and/or used to control the operating conditions of an annealing furnace. The translation circuit is also fed with a signal from a γ-ray sensor measuring the thickness of the sheet and a sensor measuring the width to weight the output of the sensing coil.
GB5505271A 1971-11-26 1971-11-26 Magnetic testing apparatus Expired GB1427703A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5505271A GB1427703A (en) 1971-11-26 1971-11-26 Magnetic testing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5505271A GB1427703A (en) 1971-11-26 1971-11-26 Magnetic testing apparatus

Publications (1)

Publication Number Publication Date
GB1427703A true GB1427703A (en) 1976-03-10

Family

ID=10472804

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5505271A Expired GB1427703A (en) 1971-11-26 1971-11-26 Magnetic testing apparatus

Country Status (1)

Country Link
GB (1) GB1427703A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4331919A (en) * 1978-09-08 1982-05-25 British Steel Corporation Apparatus for magnetic testing ferromagnetic sheet or strip material using rectangular coils
US4659991A (en) * 1983-03-31 1987-04-21 Ndt Technologies, Inc. Method and apparatus for magnetically inspecting elongated objects for structural defects
CN109884169A (en) * 2019-03-29 2019-06-14 大连海事大学 A kind of multi-functional oil liquid detection device and preparation method thereof
CN109916785A (en) * 2019-03-29 2019-06-21 大连海事大学 A kind of planar inductor formula abrasive grain monitoring device and preparation method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4331919A (en) * 1978-09-08 1982-05-25 British Steel Corporation Apparatus for magnetic testing ferromagnetic sheet or strip material using rectangular coils
US4659991A (en) * 1983-03-31 1987-04-21 Ndt Technologies, Inc. Method and apparatus for magnetically inspecting elongated objects for structural defects
CN109884169A (en) * 2019-03-29 2019-06-14 大连海事大学 A kind of multi-functional oil liquid detection device and preparation method thereof
CN109916785A (en) * 2019-03-29 2019-06-21 大连海事大学 A kind of planar inductor formula abrasive grain monitoring device and preparation method thereof
CN109916785B (en) * 2019-03-29 2021-10-22 大连海事大学 Planar inductive abrasive particle monitoring device and manufacturing method thereof

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Legal Events

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