迄今为止使用的磁场线圈间距全为固定式，而环境又几乎全有较大的磁场梯度。
Before the successful development of this system, the coil spacing in the magnetic field coil system was fixed and there are large magnetic gradients in almost all the environment;
可任意调节电磁线圈匝数，匝间距离，产 生频率变化磁场分布变化。
The advantages lie in that the electromagnetic coil turns and turn-to-turn distance can be randomly regulated to generate frequency changes and magnetic field distribution changes.
本文主要采用脉冲涡流无损检测技术对测量金属厚度和金属与线圈之间距离的方法进行了研究。
This thesis mainly researches the methods which measure the mental thickness and the distance between the mental and the coil through adopting the technology of pulsed eddy current (PEC).
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