Optimization frequency design of eddy current testing
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Publication Details
Author list: Mungkung N., Chomsuwan K., Pimpru N., Yuji T.
Publisher: World Scientific and Engineering Academy and Society (WSEAS)
Publication year: 2008
Journal: WSEAS Transactions on Circuits and Systems (1109-2734)
Volume number: 7
Issue number: 4
Start page: 213
End page: 217
Number of pages: 5
ISSN: 1109-2734
Languages: English-Great Britain (EN-GB)
Abstract
The purposes of this research were to construct the nondestructive metal testing intrument by using eddy current method and to find an optimal frequency for the metal testing intrument. The testing intrument consist of a sine wave oscillator circuit which can adjust the frequency between 20-90 kHz, and a 50 ohms sensor circuit. There are three kinds of testing intrument. The first was the nondestructive imperfection testing by using eddy current method. The sample irons are constructed with different imperfection on surface. The output signals of testing from the sensor circuit are compared. The second was the nondestructive categorization metal testing by using eddy current method. Many kinds of metals are taken to testing. The last one was the nondestructive testing for finding the thickness of films on iron by using eddy current method. In this testing the thickness of films varied between 100 - 700 microns. In all testing, differences of the signal testing were compared to analyze the optimal frequency for the testing intrument. The results of research showed that the nondestructive metal testing intrument by using eddy current method can be used to find a different imperfective iron, categorize the metal and find thickness of films. In addition, the range of an optimal frequency is 30 kHz to 70 kHz for testing intrument.
Keywords
Eddy current, Nondestructive, Optimal frequency, Thickness of films
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