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Abstract

This paper presents an electromagnetic testing method for moisture separator reheater (MSR) tubes, which is based on partial saturation eddy current testing (PSECT). The sensor probe has a permanent magnet that is used to partially saturate the MSR tube material, a bobbin coil is used to supply an alternating electromagnetic field that penetrates into the tube, and a bobbin-type integrated Hall sensor (BIHaS) array is used to measure the radial component of the electromagnetic field distribution in the tube. The BIHaS has 15 Hall sensor elements arrayed at 24 ${}^{\circ}$ (2.72 mm) intervals on the circumference to make a 13.5 mm diameter sensor probe. Thus, the spatial resolution of measurement can be improved rather than using a single/differential-type sensing coil as used in conventional PSECT systems. The efficiency of PSECT over magnetic flux leakage testing and eddy current testing is presented. Furthermore, the quantitative evaluation of damage volume can be performed.

Keywords

Hall sensor array partial saturation eddy current testing electromagnetic testing moisture separator reheater

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Electromagnetic testing of moisture separator reheater tubes using a bobbin-type integrated Hall sensor array

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