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研究了基于超磁致伸缩材料实现对光纤布拉格光栅的动态调谐这一方案理论上可获得的最大调谐范围.利用超磁致伸缩换能器的输出特性,进行了超磁致伸缩换能器用于光纤布拉格光栅调谐的实验研究.分析了实验中影响可获得调谐范围的各种因素,如实际可获得的超磁致伸缩材料的特性、光纤布拉格光栅的特性以及换能器结构的设计.进一步讨论了在理论界限的前提下改进该方案可获得调谐范围的措施,并以施加预应力为例进行了实验验证.结果表明,通过给予超磁致伸缩材料合适的预应力,可以较明显地改善最大调谐范围.
The maximum tuning range theoretically available for the dynamic tuning of fiber Bragg gratings based on a giant magnetostrictive material is investigated. By using the output characteristics of a giant magnetostrictive transducer, a giant magnetostrictive transducer The experimental research on fiber Bragg grating tuning is analyzed.The various factors affecting the tuning range available in the experiment are analyzed, such as the characteristics of the actual available magnetostrictive material, the characteristics of fiber Bragg grating and the design of the transducer structure.Further discussion The measures to improve the tuning range of this scheme are given under the premise of the theoretical limit, and the experimental verification is carried out by applying the prestressing force.The results show that the maximum prestressing force of GMA can obviously improve the maximum Tuning range.