将磁致伸缩涂料涂于光纤上,可制成磁场探测器。简单的情况是:当磁致伸缩包层随施加的磁场而改变长度时,光纤长度也随之改变。光纤长度改变时通过光纤传播光信号的位相也随之改变。检测位相变化比较简单,干涉计量术是检测位相变化的技术之一。但是,这项工作并不是这样简单。为了获得高度敏感的磁场传感装置,需选用一种合适的磁致伸缩材 Magnetostrictive coating applied to the optical fiber can be made of magnetic field detector. The simple case is that when the magnetostrictive cladding changes length with the applied magnetic field, the length of the fiber changes. The phase of the optical signal propagating through the fiber also changes as the fiber length changes. Detection of phase changes is relatively simple, interferometry is to detect phase changes in the technology. However, this work is not that simple. In order to obtain a highly sensitive magnetic field sensing device, choose a suitable magnetostrictive material