scholarly journals High-sensitivity and large-dynamic-range refractive index sensors employing weak composite Fabry–Perot cavities

2017 ◽  
Vol 42 (16) ◽  
pp. 3145 ◽  
Author(s):  
Pengcheng Chen ◽  
Xuewen Shu ◽  
Haoran Cao ◽  
Kate Sugden
2021 ◽  
Vol 24 (6) ◽  
pp. 1248-1255
Author(s):  
Cailing Fu ◽  
Yi-Qing Ni ◽  
Tong Sun ◽  
Yiping Wang ◽  
Siqi Ding ◽  
...  

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.


2001 ◽  
Author(s):  
Mikhail G. Shlyagin ◽  
Pieter L. Swart ◽  
Serguei V. Miridonov ◽  
Anatoli A. Chtcherbakov ◽  
Ileana Marquez Borbon ◽  
...  

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