Development of an inspection system for surface corrosion of pipes covered with heat insulators by ac impedance method using rotating magnetic field

在这项研究中，管道检测系统利用电磁现象的表面腐蚀的管道覆盖热绝缘体的发展。为管道检测系统创建了一个产生旋转磁场的电磁铁，并确认其具有足够的性能。为提高管道表面腐蚀检测的准确度，对该频率下阻抗的测量条件进行了研究，找出了提高检测准确度的具体频率。

In this study, a pipe inspection system using electromagnetic phenomenon for surface corrosion of pipes covered with heat insulators is developed. An electromagnet to produce a rotating magnetic field was created for the pipe inspection system ; it was confirmed to have an enough performance. To improve inspection accuracy of the surface corrosion of pipes, measurement conditions of impedance at the frequency were examined ; the specific frequencies to improve inspection accuracy were found.