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Development and Calibration of a Plate Type Eddy Current Standard  

Kim, Young-Joo (Safety Metrology Group, Korea Research Institute of Standards and Science)
Kim, Young-Gil (Safety Metrology Group, Korea Research Institute of Standards and Science)
Ahn, Bong-Young (Safety Metrology Group, Korea Research Institute of Standards and Science)
Yoon, Dong-Jin (Safety Metrology Group, Korea Research Institute of Standards and Science)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.27, no.5, 2007 , pp. 393-397 More about this Journal
Abstract
Eddy current standard including an artificial slot for the calibration of absolute type surface probe was fabricated. Developed eddy current standard has the electric conductivity and dimensions, and contains artificial slot as established in ASTM E 1629. The width and depth of artificial slot are 0.1 mm and 0.5 mm respectively. This slot was only possible to measure the depth on the two side edges, and impossible for the middle part with general measurement tools. The ultrasonic test method was applied for measuring depth of the middle part of the artificial slot in the standard. Using this method the dimension could be measured successfully with uncertainty about $15\;{\mu}m$. Calibration of eddy current standard for the absolute probe can be performed by this technique.
Keywords
Eddy Current; Standard; Probe; Absolute Probe; Artificial Slot; Depth Measurement;
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  • Reference
1 ASTM E1629 'Standard Practice for Determining the Impedance of Absolute Eddy-Current Probes' R(200l)
2 Draft International Standard ISO/DIS 15548-3, 'Non-destructive Testing-Equipment for Eddy Current Examination-Part 3: System Characteristics and Verification' (2006)
3 ASTM E1004 'Standard Practice for Determining Electrical Conductivity Using the Electromagnetic (Eddy-Current) Method,' (1999)
4 한국표준과학연구원, 측정 불확도 표현 지침 (KRI5S-99-070-SP) (1999)
5 Draft International Standard ISO/DIS 15548-2, 'Non-destructive Testing-Equipment for Eddy Current Examination-Part 2: Probe Characteristics and Verification' (2006)
6 Draft International Standard ISO/DIS 15548-1, 'Non-destructive Testing-Equipment for Eddy Current Examination-Part 1: Instrument Characteristics and Verification' (2006)
7 Young-Joo Kim et al. 'Measurement of the depyh of narrow slotted sections in eddy current reference standards,' Metrologia 44 pp. 53-56 (2007)   DOI   ScienceOn