基于双峰谐振长周期光纤光栅的海水盐度传感器

杜超; 赵爽; 宋桦可; 王秋雨; 贾斌; 张丽; 崔丽琴; 赵强; 邓霄

doi:10.37188/CO.2023-0101

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Chinese Optics > 2023 > Accepted Manuscript

DU Chao, ZHAO Shuang, SONG Hua-ke, WANG Qiu-yu, JIA Bin, ZHANG Li, CUI Li-qin, ZHAO Qiang, DENG Xiao. A seawater salinity sensor based on dual peaks resonance long period fiber grating[J]. Chinese Optics. doi: 10.37188/CO.2023-0101

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A seawater salinity sensor based on dual peaks resonance long period fiber grating

doi: 10.37188/CO.2023-0101

DU Chao^1
,,
ZHAO Shuang^1
,,
SONG Hua-ke^2
,,
WANG Qiu-yu^1
,,
JIA Bin^1
,,
ZHANG Li^1
,,
CUI Li-qin^1
,,
ZHAO Qiang^3
,,
DENG Xiao^{2
,
,}

1.
College of Electronic Information and Optical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2.
College of Physics, Taiyuan University of Technology, Taiyuan 030024, China
3.
Institute of Oceanographic Instrumentation, Qilu University of Technology (Shandong Academy of Sciences) Qingdao 266061, China

Funds: Supported by National Natural Science Foundation of China (No. 62203320, No. 62375198, No. 52009088, No. 61933004); Project funded by China Postdoctoral Science Foundation (No. 2019M661063); Research Project Supported by Shanxi Scholarship Council of China (No. 2023-039); Science and Technology Innovation Project of Laoshan Laboratory (Qingdao) (No. LSKJ202204703)

More Information

Corresponding author: dengxiao@tyut.edu.cn
Available Online: 06 Nov 2023

Abstract

Abstract

To develop a highly sensitive seawater salinity sensor, a long period fiber grating (LPFG) was successfully fabricated using CO₂ laser technology to function in close proximity to the dispersion turning point (DTP). An LPFG operating near DTP was fabricated in an 80 μm single mode fiber using CO₂ laser micromachining technology. This successful endeavor demonstrates the feasibility of developing LPFG with shorter grating period. LPFGs with varying periods were fabricated using a CO₂ laser to ensure that the cladding mode LP_1,9 was operating near DTP, resulting in higher refractive index sensitivity of LPFG. The average sensitivity of 0.279 nm/‰ can be achieved in the seawater with salinity ranging from 5.001 ‰ to 39.996 ‰, especially with the dual peak resonance LPFG at a period of 115.4 μm, thanks to the dual peak resonance effect. The dual peaks resonance LPFG seawater salinity sensor exhibits high sensitivity and a large attenuation loss, suggesting potential application in seawater salinity monitoring.
- fiber optics,
- long period fiber grating,
- dispersion turning point,
- seawater salinity,
- CO₂ laser technology

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References(29)

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