High temperature thickness measurements of stainless steel and low carbon steel using electromagnetic acoustic transducers
High temperature thickness measurements of stainless steel and low carbon steel using electromagnetic acoustic transducers
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DOI：
10.1016/j.ndteint.2014.07.009
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发表时间：
2014-12-01
影响因子：
4.2
通讯作者：
Dixon, S.
中科院分区：
文献类型：
--
作者：
Burrows, S. E.;Fan, Y.;Dixon, S.
使用非接触式水冷EMAT（电磁声换能器）和激光EMAT系统在高温下对钢管进行厚度测量，其中使用带光纤电缆的便携式Nd:YAG激光器在样品上产生超声波，使用水冷线圈缠绕EMAT检测超声波。该装置的设计使激光通过EMAT中心的一个孔发射，并采用低通5 MHz滤波器来降低等离子体噪声。在高达900摄氏度的温度下，不锈钢和铁磁性低碳钢的后壁反射清晰可见，考虑到样品的热膨胀，可以测量壁厚。水冷EMAT系统可以在居里点温度下测量铁磁低碳钢的壁厚；在这里，超声波的产生取决于钢的磁性状态。(C) 2014年作者。Elsevier Ltd.出版。这是一篇基于CC BY许可的开放获取文章
Thickness measurements were made on steel pipe at high temperatures using a non-contact water-cooled EMAT (electromagnetic acoustic transducer) and also a laser-EMAT system where a portable Nd:YAG laser with a fibre optic cable was used to generate ultrasound on a sample, and a water-cooled coil-wound EMAT used to detect ultrasound. The set-up was designed so that the laser was fired through a hole in the centre of the EMAT, and a low pass 5 MHz filter employed to reduce the plasma noise. Back wall reflections were clearly visible at temperatures up to 900 degrees C on stainless and ferromagnetic low carbon steel, enabling wall thickness to be measured, taking into account thermal expansion of the sample. The water-cooled EMAT system can measure wall thickness on ferromagnetic low carbon steel at temperatures up to the Curie point; here, ultrasound generation is dependent on the magnetic state of the steel. (C) 2014 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license