Young-Joo Kim et al 2007 Metrologia 44 53 doi:10.1088/0026-1394/44/1/007
Measurement of the depth of narrow slotted sections in eddy current reference standards
Young-Joo Kim, Young-gil Kim, Bongyoung Ahn and Dong-Jin Yoon
Show affiliationsThe dimensions of the slots in eddy current (EC) reference standards are too narrow to be measured by general depth measurement methods such as the optical (laser) or stylus methods. However, measurement of the dimensions of the machined slots is a prerequisite to using the blocks as references. The present paper suggests a measurement method for the slotted section using an ultrasonic test. The width and depth of the slots measured in our study are roughly 0.1 mm and 0.5 mm, respectively. The time of flight (TOF) of the ultrasonic wave was measured precisely. The ultrasonic velocity in the material of the EC reference standard was calculated with the measured values of the TOF and its thickness. Reflected waves from the tip of the slot and the bottom surface of the EC standard were successfully classified. Using this method we have successfully determined the depth of the slotted section.
- PACS
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81.70.Cv Nondestructive testing: ultrasonic testing, photoacoustic testing
- Subjects
- Dates
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Issue 1 (February 2007)
Received 26 September 2006
Published 9 January 2007
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Measurement of the depth of narrow slotted sections in eddy current reference standards
Young-Joo Kim et al 2007 Metrologia 44 53
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