CA2312101A1 - In-service detection of corrosion in multi-layer structure using the lift-off point of intersection - Google Patents

In-service detection of corrosion in multi-layer structure using the lift-off point of intersection Download PDF

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Publication number
CA2312101A1
CA2312101A1 CA 2312101 CA2312101A CA2312101A1 CA 2312101 A1 CA2312101 A1 CA 2312101A1 CA 2312101 CA2312101 CA 2312101 CA 2312101 A CA2312101 A CA 2312101A CA 2312101 A1 CA2312101 A1 CA 2312101A1
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Canada
Prior art keywords
lift
point
intersection
corrosion
technique
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CA 2312101
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French (fr)
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CA2312101C (en
Inventor
Sylvain R. Giguere
Stephane J. M. Dubois
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Minister of National Defence of Canada
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Minister of National Defence of Canada
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Priority to CA 2312101 priority Critical patent/CA2312101C/en
Publication of CA2312101A1 publication Critical patent/CA2312101A1/en
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Publication of CA2312101C publication Critical patent/CA2312101C/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
    • 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

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

Abstract

A method for the detection and the characterization of corrosion in multi-layer metallic structures using a pulsed eddy current technique. For this technique, a coil (or coils) is used both as field source (driven by a square wave voltage-controlled excitation), and/or as field sensor (measuring a transient response). The field sensor allows the capture of information about the condition of the area of the structure under inspection. The ability of this technique to detect corrosion hinges on the use of a transient response feature (i.e., Lift-off Point of Intersection) to infer the presence of material loss. With the help of a calibration standard, the Lift-off Point of Intersection provides the ability to quantify material loss in multi-layered structures. The results obtained with this method are independent of lift-off variations inherent to field inspections (i.e., changes in distance between the transducer and test object).
CA 2312101 2000-06-22 2000-06-22 In-service detection of corrosion in multi-layer structure using the lift-off point of intersection Expired - Fee Related CA2312101C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 2312101 CA2312101C (en) 2000-06-22 2000-06-22 In-service detection of corrosion in multi-layer structure using the lift-off point of intersection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA 2312101 CA2312101C (en) 2000-06-22 2000-06-22 In-service detection of corrosion in multi-layer structure using the lift-off point of intersection

Publications (2)

Publication Number Publication Date
CA2312101A1 true CA2312101A1 (en) 2001-12-22
CA2312101C CA2312101C (en) 2004-01-06

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CA 2312101 Expired - Fee Related CA2312101C (en) 2000-06-22 2000-06-22 In-service detection of corrosion in multi-layer structure using the lift-off point of intersection

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CA (1) CA2312101C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008002883A1 (en) 2007-06-12 2008-12-24 GE Inspection Technologies, Ltd., St. Albans Automatic lift-off compensation for pulse vortex testing
WO2022170417A1 (en) * 2021-02-09 2022-08-18 Olympus NDT Canada Inc. Lift-off compensated eddy current system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109444257B (en) * 2018-11-26 2020-11-10 中国矿业大学 Pulse eddy current detection device and method based on frequency domain lift-off intersection point

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008002883A1 (en) 2007-06-12 2008-12-24 GE Inspection Technologies, Ltd., St. Albans Automatic lift-off compensation for pulse vortex testing
US8008913B2 (en) 2007-06-12 2011-08-30 Ge Inspection Technologies, Ltd Automatic lift-off compensation for pulsed eddy current inspection
WO2022170417A1 (en) * 2021-02-09 2022-08-18 Olympus NDT Canada Inc. Lift-off compensated eddy current system

Also Published As

Publication number Publication date
CA2312101C (en) 2004-01-06

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