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

Sensors

Liren Tsai¹  Chia-Chin Chiang¹  Hsiang-Chang Hsu¹  Tso-Sheng Hsieh¹  Tzu-Hsuan Huang¹ 

[1] Department of Mechanical Engineering, National Kaohsiung University of Sciences and Technology, NO.415 Jian-gong Road, Kaohsiung, Kaohsiung City 80778, Taiwan;

关键词: sol-gel;    CO2;    gas sensor;   

DOI  :  10.3390/s18103206

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown