Multimode Interference in Single Mode–Multimode FBG for Simultaneous Measurement of Strain and Bending
Multimode Interference in Single Mode–Multimode FBG for Simultaneous Measurement of Strain and Bending
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DOI：
10.1109/jsen.2014.2383838
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发表时间：
2015-06
影响因子：
4.3
通讯作者：
A. Sun;Zhishen Wu
中科院分区：
文献类型：
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作者：
A. Sun;Zhishen Wu
在本文中，通过实验研究了基于单模式的纤维纤维光栅（FBG）结构的应变和弯曲的分歧测量。实验结果表明，由于多模层干扰的影响，单模模式FBG的反射模式对传输多模纤维的弯曲表现出不同的反应，可用于弯曲的比例检测，同时，反射模式的波长是免疫的。从弯曲但敏感到应变。通过同时测量FBG共振的波长移位以及不同模式之间的反射强度比，可以使用单模型Multimode FBG的反射模式与弯曲，应变和弯曲的不同响应进行区分。
In this paper, a discriminating measurement of strain and bending based on single mode-multimode fiber Bragg grating (FBG) structure is investigated experimentally. Experimental results show that the reflected modes of single mode-multimode FBG exhibit different responses toward the bending of transmitting multimode fiber because of the effect of multimode interference, which can be used for ratiometrical detection of bending, meanwhile the wavelength of the reflected modes is immune from bending but sensitive to strain. Using the different responses of the reflected modes of single mode-multimode FBG to bending, strain and bending can be discriminated by measuring simultaneously the wavelength shift of FBG resonance and the reflected intensity ratio between different modes.