GB573152A - Improvements in or relating to the detection of faults in non-magnetic materials - Google Patents

Improvements in or relating to the detection of faults in non-magnetic materials

Info

Publication number
GB573152A
GB573152A GB814643A GB814643A GB573152A GB 573152 A GB573152 A GB 573152A GB 814643 A GB814643 A GB 814643A GB 814643 A GB814643 A GB 814643A GB 573152 A GB573152 A GB 573152A
Authority
GB
United Kingdom
Prior art keywords
specimen
field
magnetic field
detecting
coils
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
GB814643A
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.)
ALAN MARSH ARMOUR
JAMES WILLIAM WALLEY
Metropolitan Vickers Electrical Co Ltd
Original Assignee
ALAN MARSH ARMOUR
JAMES WILLIAM WALLEY
Metropolitan Vickers Electrical 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 ALAN MARSH ARMOUR, JAMES WILLIAM WALLEY, Metropolitan Vickers Electrical Co Ltd filed Critical ALAN MARSH ARMOUR
Priority to GB814643A priority Critical patent/GB573152A/en
Publication of GB573152A publication Critical patent/GB573152A/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
    • G01N27/90—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
    • G01N27/9093—Arrangements for supporting the sensor; Combinations of eddy-current sensors and auxiliary arrangements for marking or for rejecting

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

573,152. Determining physical qualities of materials. ARMOUR, A. M., WALLEY, J. W., and METROPOLITAN-VICKERS ELECTRICAL CO., Ltd. May 21, 1943, No. 8146. [Class 37] An arrangement for detecting faults in specimens of electrically conducting non-ferrous materials comprises means for subjecting the specimen to the action of a constant magnetic field, means for producing relative rotation between the specimen and magnetic field about an axis transverse to the direction in which the magnetic field acts, and search coil means arranged for detecting any variation of the induced cross-field whereby to provide an indication of the presence.or absence of a fault in the specimen. Fig. 2 shows an arrangement for detecting flows in a cylindrical specimen r of a non-magnetic alloy. The specimen is supported on a rotatable platform b having means hj, hk for centering the specimen accurately between the poles of constantly energized electromagnets en, es carried on a magnetic yoke y. The platform l is rotated at a constant speed of about thirty revolutions per minute by a motor d. The induced cross field is picked up by two pairs of search coils C<1> C<2> or C<3> C<4> arranged in series and connected to a galvanometer a. The coils of each pair are oppositely arranged so as to eliminate the effects of mechanical inaccuracies. The existence of a flow causes a change in the cross field at twice the frequency of revolution. This is shown by deflections on the meter a, which is selected to have a natural frequency of vibration equal to that of the fluctuations. The sensitivity is increased by providing the search coils with high permeability cores. Different regions of the specimens are tested by moving the magnet assembly axially along guides m by means of motors q and chain and counterweight mechanism.
GB814643A 1943-05-21 1943-05-21 Improvements in or relating to the detection of faults in non-magnetic materials Expired GB573152A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB814643A GB573152A (en) 1943-05-21 1943-05-21 Improvements in or relating to the detection of faults in non-magnetic materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB814643A GB573152A (en) 1943-05-21 1943-05-21 Improvements in or relating to the detection of faults in non-magnetic materials

Publications (1)

Publication Number Publication Date
GB573152A true GB573152A (en) 1945-11-08

Family

ID=9846630

Family Applications (1)

Application Number Title Priority Date Filing Date
GB814643A Expired GB573152A (en) 1943-05-21 1943-05-21 Improvements in or relating to the detection of faults in non-magnetic materials

Country Status (1)

Country Link
GB (1) GB573152A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202914A (en) * 1960-06-29 1965-08-24 American Mach & Foundry Apparatus for inspection of tubular ferromagnetic members using plural movable search shoes for identifying area depth and location of discontinuities
GB2121544A (en) * 1982-06-04 1983-12-21 Sidco Sa Eddy-current testing apparatus for checking features of parts
US4906925A (en) * 1979-12-05 1990-03-06 Outokumpu Oy Apparatus for detecting conductive materials in a moving flow

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202914A (en) * 1960-06-29 1965-08-24 American Mach & Foundry Apparatus for inspection of tubular ferromagnetic members using plural movable search shoes for identifying area depth and location of discontinuities
US4906925A (en) * 1979-12-05 1990-03-06 Outokumpu Oy Apparatus for detecting conductive materials in a moving flow
GB2121544A (en) * 1982-06-04 1983-12-21 Sidco Sa Eddy-current testing apparatus for checking features of parts

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