And besides, under a large power angle condition, the magnetic field distortion will enlarge air-gap part of the main magnetic path and influence the value of the air-gap voltage ES.
而在功角较大状态下发生的磁场畸变则增长了主磁路经过气隙的部分，同样会影响合成电流产生气隙电势的大小。
The main parts of the article are the designation of magnetic path for the detecting system and the "no blind areas" method, which is based on the signal relativity operation.
本文的重点在于系统的磁路设计，采用信号相关性运算比较被测钢管信号和模板信号缩小端头盲区的“无盲区”方法。
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