材料科学
扭转(腹足类)
折射率
衰减
芯(光纤)
亚波长直径光纤
栅栏
光纤
光学
题字图形
耐久性
复合材料
光电子学
波长
几何学
医学
物理
外科
数学
作者
Cailing Fu,Yi Ni,Tao Sun,Yiping Wang,Siqi Ding,Miodrag Vidakovic
标识
DOI:10.1177/1369433221992485
摘要
This study is intended to develop long period fibre grating sensors for potential applications in environmental and durability monitoring of coastal structures. High-quality helical long period fibre gratings (HLPFGs) are inscribed in different types of small-core single mode fibre (SMF) by use of hydrogen-oxygen flame heating technique. A detailed investigation of the effect of core diameter on their transmission spectrum and optimum length of the HLPFG has been pursued. A longer length is required to achieve the same coupling attenuation in a smaller-core SMF than that of a larger-core fibre. The strain, torsion and refractive index (RI) properties of the HLPFG is investigated experimentally to develop a high-sensitivity sensor. The experimental results show that the strain sensitivity could be enhanced by means of employing a larger-core diameter SMF. Moreover, the HLFPGs are also sensitive to the torsion and external RI. Hence, such HLFPGs have great potential for sensing applications.
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