Development of Magnetic Sensor Based Eddy Current Technique for Surface Inspection of Rod Steel

In this study, we developed and characterised a method for detecting microcracks in steel materials by eddy current testing (ECT). Magnetic saturation ECT is applied because magnetic noise is generated by steel materials during ECT. Although direct-current (DC) magnetisation is generally used for magnetic saturation ECT, the use of alternate-current (AC) magnetisation offers several advantages. When using AC magnetisation for surface flaw detection, the magnetisation is not influenced by the thickness of the test object owing to the skin effect; therefore, demagnetisation is unnecessary. In this study, we evaluated microcrack detection results obtained using AC magnetisation ECT with different synchronous positions (conditions) of the magnetisation and ECT; and identified the optimum synchronous position. In addition, the magnetisation distribution in a test object was evaluated by the finite element method analysis and the flaw detection results were verified.

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An Eddy Current Sensor Array to Detect Defects on a Metal Surface

Jiang

Zhang

2012

AMR

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In order to detect the surface defects of metal work piece, a sensor array is designed based on the principle of eddy current detection. According to the difference of frequency in LC oscillatory circuit, the information of the metal work piece can be obtained. In order to acquire a stable result, an algorithm is proposed to eliminate the transient disturbance and to reduce the influence of temperature drift. With the embedded system of arm7 kernel, the result of data can be displayed in graphical format. The experiment shows that the sensor array has soundness and operability.

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Development of Magnetic Sensor Based Eddy Current Technique for Surface Inspection of Rod Steel

Abstract: Synopsis Eddy current probe to detect longitudinal discontinuities such as seams of wires and bars has been discussed. Conventional encircling coil is hard to detect the longitudinal discontinuities

Cited by 3 publications

References 8 publications

Development of ECT probe for flaw detection of microcrack in spring steel material

Development of ECT probe for flaw detection of microcrack in spring steel material

Consideration of magnetic saturation ECT using AC magnetisation

An Eddy Current Sensor Array to Detect Defects on a Metal Surface

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