Modeling the Response of a Long-Period Fiber Grating to Ambient Refractive Index Change in Chemical Sensing Applications

2008 ◽  
Vol 26 (13) ◽  
pp. 1986-1992 ◽  
Author(s):  
Hannes Hochreiner ◽  
Michael Cada ◽  
Peter D. Wentzell
Keyword(s):  
Refractive Index ◽  
Chemical Sensing ◽  
Refractive Index Change ◽  
Fiber Grating ◽  
Index Change ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Sensing Applications ◽  
Period Fiber Grating

Potential-Scanning Sensing for Refractive Index Using an Indium Tin Oxide (ITO)-Coated Long-Period Fiber Grating (LPFG)

2021 ◽  
pp. 1-11
Author(s):  
Takuya Okazaki ◽  
Tatsuya Orii ◽  
Shin-Yinn Tan ◽  
Tomoaki Watanabe ◽  
Akira Taguchi ◽  
...  
Keyword(s):  
Refractive Index ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Period Fiber Grating

scholarly journals Double Notched Long-Period Fiber Grating Characterization for CO2 Gas Sensing Applications †

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3206 ◽  
Author(s):  
Hsiang-Chang Hsu ◽  
Tso-Sheng Hsieh ◽  
Tzu-Hsuan Huang ◽  
Liren Tsai ◽  
Chia-Chin Chiang
Keyword(s):  
Gas Sensor ◽  
Transmission Loss ◽  
Gas Sensing ◽  
Fiber Grating ◽  
Co2 Gas ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Sensing Applications ◽  
Co2 Gas Sensor ◽  
Period Fiber Grating

In this study, we applied a double-sided inductively coupled plasma (ICP) process to nanostructure long-period fiber grating (LPFG) in order to fabricate a double-notched LPFG (DNLPFG) sensor with a double-sided surface corrugated periodic grating. Using the sol-gel method, we also added thymol blue and ZnO to form a gas sensing layer, thus producing a DNLPFG CO2 gas sensor. The resulting sensor is the first double-sided etching sensor used to measure CO2. The experimental results showed that as the CO2 concentration increased, the transmission loss increased, and that the smaller the fiber diameter, the greater the sensitivity and the greater the change in transmission loss. When the diameter of the fiber was 32 μm (and the period was 570 μm) and the perfusion rate of CO2 gas was 15%, the maximum loss variation of up to 3.881 dB was achieved, while the sensitivity was 0.2146 dB/% and the linearity was 0.992. These results demonstrate that the DNLPG CO2 gas sensor is highly sensitive.

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