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针对传统的电类传感器因易受电磁干扰而无法实现对线圈内部应变的测量,本文利用光纤Bragg光栅(FBG)不受电磁干扰和体积极小的优势,通过实验研究,成功地将3个FBG嵌入到磁体线圈由内到外3个不同的线层中。液氮环境下对磁体线圈1 000V放电实验结果显示,3个FBG测得磁体内部不同线圈层产生的最大应变分别为34、63和13με,应变分布规律与相关的仿真研究结果一致。实验表明,通过嵌入FBG研究脉冲强磁体励磁过程中应变分布及变化的方法可行有效。
Aiming at the problem that the traditional electric sensors can not measure the internal strain due to electromagnetic interference easily, this paper makes use of the advantages of the fiber Bragg grating (FBG), which is not subject to electromagnetic interference and the volume is extremely small. Through the experimental research, Embedded in the magnet coil from the inside to the outside of 3 different layers. The experimental results of 1 000V discharge on the magnet coil in liquid nitrogen show that the maximum strains of the different coil layers in the three FBG magnets are 34, 63 and 13με, respectively. The strain distribution is consistent with the simulation results. Experiments show that it is feasible to study the distribution and variation of strain in the excitation process of pulsed strong magnets by embedding FBG.