scholarly journals Characterization of Long-period Grating Refractive Index Sensors and Their Applications

Sensors ◽  
2009 ◽  
Vol 9 (6) ◽  
pp. 4559-4571 ◽  
Author(s):  
Hiroshi Tsuda ◽  
Kei Urabe
Keyword(s):  
Refractive Index ◽  
Long Period Grating ◽  
Long Period ◽  
Refractive Index Sensors

Optimization of Cladding-Structure-Modified Long-Period-Grating Refractive-Index Sensors

2007 ◽  
Vol 25 (1) ◽  
pp. 372-380 ◽  
Author(s):  
Jian Yang ◽  
Li Yang ◽  
Chang-Qing Xu ◽  
Yingfu Li
Keyword(s):  
Refractive Index ◽  
Long Period Grating ◽  
Long Period ◽  
Refractive Index Sensors

scholarly journals Refractive Index Sensors Based on Long-Period Grating in a Negative Curvature Hollow-Core Fiber

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1803
Author(s):  
Hanna Izabela Stawska ◽  
Maciej Andrzej Popenda
Keyword(s):  
Refractive Index ◽  
Negative Curvature ◽  
Hollow Core ◽  
Long Period Grating ◽  
Fiber Gratings ◽  
Long Period ◽  
Analytical Formulas ◽  
Core Fiber ◽  
Refractive Index Sensors ◽  
Transmission Windows

Long-period optical fiber gratings (LPGs) are one of the widely used concepts for the sensing of refractive index (RI) changes. Negative curvature hollow-core fibers (NCHCFs), with their relatively large internal diameters that are easy to fill with liquids, appear as a very interesting medium to combine with the idea of LPGs and use for RI sensing. However, to date, there has been no investigation of the RI sensing capabilities of the NCHCF-based LPGs. The results presented in the paper do not only address this matter, but also compare the RI sensitivities of the NCHCFs alone and the gratings. By modeling two revolver-type fibers, with their internal diameters reflecting the results of the possible LPG-inscription process, the authors show that the fibers’ transmission windows shift in response to the RI change, resulting in changes in RI sensitivities as high as −4411 nm/RIU. On the contrary, the shift in the transmission dip of the NCHCF-based LPGs corresponds to a sensitivity of −658 nm/RIU. A general confirmation of these results was ensured by comparing the analytical formulas describing the sensitivities of the NCHCFs and the NCHCF-based LPGs.

scholarly journals Waveguide asymmetric long-period grating couplers as refractive index sensors

2020 ◽  
Vol 28 (16) ◽  
pp. 23936
Author(s):  
Jens Høvik ◽  
Mukesh Yadav ◽  
Jong Wook Noh ◽  
Astrid Aksnes
Keyword(s):  
Refractive Index ◽  
Long Period Grating ◽  
Grating Couplers ◽  
Long Period ◽  
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.

Study and investigation of long period grating as refractive index sensor

Optik ◽  
2014 ◽  
Vol 125 (7) ◽  
pp. 1860-1863 ◽  
Author(s):  
Amit Singh ◽  
Shashi B. Rana ◽  
Maninder Singh ◽  
Anish Sharma
Keyword(s):  
Refractive Index ◽  
Refractive Index Sensor ◽  
Long Period Grating ◽  
Long Period

Measurements of refractive index sensitivity using long-period grating refractometer

2004 ◽  
Vol 229 (1-6) ◽  
pp. 65-69 ◽  
Author(s):  
Joo Hin Chong ◽  
Ping Shum ◽  
H Haryono ◽  
A Yohana ◽  
M.K Rao ◽  
...  
Keyword(s):  
Refractive Index ◽  
Long Period Grating ◽  
Refractive Index Sensitivity ◽  
Long Period ◽  
Index Sensitivity
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