GB1318346A - High-frequency eddy-current non-destructuve testing apparatus - Google Patents

High-frequency eddy-current non-destructuve testing apparatus

Info

Publication number
GB1318346A
GB1318346A GB1318346DA GB1318346A GB 1318346 A GB1318346 A GB 1318346A GB 1318346D A GB1318346D A GB 1318346DA GB 1318346 A GB1318346 A GB 1318346A
Authority
GB
United Kingdom
Prior art keywords
changes
show
testing apparatus
frequency
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
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB1318346A publication Critical patent/GB1318346A/en
Expired legal-status Critical Current

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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
    • G01N27/9046—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 by analysing electrical signals
    • G01N27/9053—Compensating for probe to workpiece spacing
    • 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
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/023—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance where the material is placed in the field of a coil
    • G01N27/025—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance where the material is placed in the field of a coil a current being generated within the material by induction

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

1318346 Automatic position control C N OWSTON 4 Sept 1970 [12 Sept 1969] 45043/69 Heading G3R [Also in Division G1] In non-destructive eddy current testing apparatus, an inductive probe 12 forming part of an oscillator tuned circuit scans an object 10 to be tested, the coupling between a probe and the object being maintained constant by detecting deviation of the oscillator frequency from a set value, via discriminator 22, to operate a positioning device, e.g. a moving coil device 16. Thus changes in object resistivity show as oscillator amplitude changes (detector 26), surface topography changes show as frequency changes, and cracks show as both amplitude and frequency changes.
GB1318346D 1969-09-12 1969-09-12 High-frequency eddy-current non-destructuve testing apparatus Expired GB1318346A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4504369 1969-09-12

Publications (1)

Publication Number Publication Date
GB1318346A true GB1318346A (en) 1973-05-31

Family

ID=10435659

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1318346D Expired GB1318346A (en) 1969-09-12 1969-09-12 High-frequency eddy-current non-destructuve testing apparatus

Country Status (2)

Country Link
DE (1) DE2044331A1 (en)
GB (1) GB1318346A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2154324A (en) * 1984-02-15 1985-09-04 Derek Harry Graddon Redman Improvements to dynamic measuring system
US4644274A (en) * 1983-04-01 1987-02-17 General Electric Company Apparatus for supporting an eddy current probe used to scan an irregular surface
WO2000032346A1 (en) * 1998-12-02 2000-06-08 Paul Leon Method for assessing the condition of an electrode surface in a spot welding machine and spot welding machine using said method
CN117849168A (en) * 2022-11-25 2024-04-09 利达机电有限公司 Detection method of commutator reinforcing ring crack detector applied to application equipment of commutator reinforcing ring crack detector

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1475517A (en) * 1974-06-27 1977-06-01 British Steel Corp Detection of surface defects in elongate metallic members
JPS55129749A (en) * 1979-03-28 1980-10-07 Sumitomo Metal Ind Ltd Sensitivity correction method for electromagnetic ultrasonic wave probe
DE3524106A1 (en) * 1985-07-05 1987-01-15 Thyssen Industrie SURFACE TESTING DEVICE
DE3839938C1 (en) * 1988-11-26 1990-04-19 Thyssen Industrie Ag, 4300 Essen, De

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644274A (en) * 1983-04-01 1987-02-17 General Electric Company Apparatus for supporting an eddy current probe used to scan an irregular surface
GB2154324A (en) * 1984-02-15 1985-09-04 Derek Harry Graddon Redman Improvements to dynamic measuring system
WO2000032346A1 (en) * 1998-12-02 2000-06-08 Paul Leon Method for assessing the condition of an electrode surface in a spot welding machine and spot welding machine using said method
FR2786720A1 (en) * 1998-12-02 2000-06-09 Paul Leon METHOD FOR EVALUATING THE SURFACE CONDITION OF AN ELECTRODE OF A POINT WELDING MACHINE AND POINT WELDING MACHINE USING SUCH A METHOD
CN117849168A (en) * 2022-11-25 2024-04-09 利达机电有限公司 Detection method of commutator reinforcing ring crack detector applied to application equipment of commutator reinforcing ring crack detector

Also Published As

Publication number Publication date
DE2044331A1 (en) 1971-03-18

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Legal Events

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