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
Keyword(s):  
Refractive Index ◽  
Dynamic Range ◽  
High Sensitivity ◽  
Large Dynamic Range ◽  
Fabry Perot ◽  
Refractive Index Sensors

Strain, torsion and refractive index sensors based on helical long period fibre grating inscribed in small-core fibre for structural condition monitoring

2021 ◽  
Vol 24 (6) ◽  
pp. 1248-1255
Author(s):  
Cailing Fu ◽  
Yi-Qing Ni ◽  
Tong Sun ◽  
Yiping Wang ◽  
Siqi Ding ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Single Mode ◽  
Structural Condition ◽  
Core Diameter ◽  
Small Core ◽  
Long Period ◽  
Sensing Applications ◽  
Core Fibre ◽  
Refractive Index Sensors

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.

Static strain measurement with submicro strain resolution and large dynamic range using twin grating Fabry-Perot sensor

2001 ◽  
Author(s):  
Mikhail G. Shlyagin ◽  
Pieter L. Swart ◽  
Serguei V. Miridonov ◽  
Anatoli A. Chtcherbakov ◽  
Ileana Marquez Borbon ◽  
...  
Keyword(s):  
Strain Measurement ◽  
Dynamic Range ◽  
Large Dynamic Range ◽  
Static Strain ◽  
Fabry Perot
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