Estimation of Unknown Parameters of the Equivalent Electrical Model During an Eddy Current Test

2020 ◽  
Vol 69 (8) ◽  
pp. 5791-5798
Author(s):  
Joao D. de O. Klein ◽  
Luciola Campestrini ◽  
Valner J. Brusamarello
Keyword(s):  
Eddy Current ◽  
Electrical Model ◽  
Unknown Parameters ◽  
Eddy Current Test ◽  
Current Test

Pre-crack fatigue life assessment of relevant aircraft materials using fractal analysis of eddy current test data

2013 ◽  
Author(s):  
Jürgen Schreiber ◽  
Ulana Cikalova ◽  
Susanne Hillmann ◽  
Norbert Meyendorf ◽  
Jochen Hoffmann
Keyword(s):  
Fatigue Life ◽  
Test Data ◽  
Eddy Current ◽  
Fractal Analysis ◽  
Life Assessment ◽  
Eddy Current Test ◽  
Current Test ◽  
Fatigue Life Assessment

The Advantages of Using Multiple Frequencies for Eddy Current Examination of Condenser Tubing

2006 ◽  
Author(s):  
Dale Droesch ◽  
Ronnie Maestas ◽  
George Saxon
Keyword(s):  
Eddy Current ◽  
Multiple Testing ◽  
Tube Wall ◽  
Essential Element ◽  
Microbiologically Influenced Corrosion ◽  
Sufficient Information ◽  
Depth Of Penetration ◽  
Eddy Current Test ◽  
Current Test ◽  
Multiple Frequencies

An essential element in the eddy current testing methodology is the use of multiple testing frequencies. A true volumetric inspection requires complete penetration of the tube wall from various perspectives. Since prime frequency is set to approximately thirty seven percent standard depth of penetration of the tube wall, additional frequencies are required to gain an accurate and detailed perspective of the defect. In fact, the need for additional frequencies is absolutely necessary to characterize particular defects such as under-deposit corrosion and microbiologically influenced corrosion. In such cases a minimum of three frequencies are required to perform optimum testing. The frequencies will vary from low, midrange to high depending on the material under test. A fourth frequency can also be used to identify tube supports and tubesheets. This paper demonstrates the effects and advantages of utilizing multiple frequencies in the testing process. The result of which is to provide the analyst with sufficient information to call the defects with greater accuracy and reliability. Utilizing a multi-frequency test instrument and standard probes commonly used for testing condenser tubes, tube samples with various defects will be examined utilizing one, two, three and four frequencies. Defect acquisition rates will also be varied and the results reported. The information is useful for determining the number of frequencies required for an effective eddy current test.

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