基于模式转换的LPFG气压传感器性能研究

doi:10.3969/j.issn.0255-8297.2025.05.001

应用科学学报 ›› 2025, Vol. 43 ›› Issue (5): 721-729.doi: 10.3969/j.issn.0255-8297.2025.05.001

• 通信工程 • 上一篇

基于模式转换的LPFG气压传感器性能研究

王朝垣, 伍华焱, 周毅, 黄荷雨, 周爱

武汉理工大学光纤传感技术与网络国家工程研究中心, 湖北武汉 430070

收稿日期:2025-01-18 发布日期:2025-10-16
通信作者: 周爱，研究员，研究方向为光器件、光纤传感等。E-mail:zhouai@whut.edu.cn E-mail:zhouai@whut.edu.cn
基金资助:
国家自然科学基金（No. 62175193）；湖北省自然科学基金杰出青年（No. 2023AFA066）

Research on Performance of LPFG Gas Pressure Sensor Based on Mode Transition

WANG Chaoyuan, WU Huayan, ZHOU Yi, HUANG Heyu, ZHOU Ai

National Engineering Research Center of Fiber Optic Sensing Technology and Networks, Wuhan University of Technology, Wuhan 430070, Hubei, China

Received:2025-01-18 Published:2025-10-16

摘要/Abstract

摘要： 本文提出了一种基于模式转换增敏的长周期光纤光栅（long period fiber grating,LPFG）气压传感器，该传感器由LPFG和两层聚合物涂层组成。内层聚乙烯醇（polyvinylalcohol,PVA）的高折射率特性可以将LPFG的工作区间调谐至模式转换区。外层聚二甲基硅氧烷（polydimethylsiloxane,PDMS）具有多孔特性，可作为传感器的气压敏感材料。实验结果表明，当PVA厚度为244 nm时，传感器灵感度达612 pm/kPa，比未激发模式转换的LPFG传感器提升约50倍。PVA和PDMS对温度敏感，因此串联了一个光纤布拉格光栅（fiber Bragg grating,FBG）进行温度补偿。利用模式转换增敏的LPFG气压传感器具有灵敏度高、制备简单等优点，有望应用于高精度气压传感领域。

关键词: 长周期光纤光栅, 模式转换, 聚乙烯醇, 聚二甲基硅氧烷, 气压传感

Abstract: This paper proposes a long period fiber grating (LPFG) pressure sensor based on mode transition, consists of LPFG and two polymer films. The inner layer of polyvinyl alcohol (polyvinyl alcohol, PVA) with high refractive index properties can be tuned to operate within the LPFG’s mode transition region. The outer layer of porous polydimethylsiloxane (PDMS) can be used as a pressure-sensitive material for the sensor. Experimental results show that the sensor achieves a sensitivity of 612 pm/kPa when the PVA thickness is 244 nm, which is approximately 50 times higher than that of a conventional LPFG sensor without excitation mode transition. To address temperature sensitivity inherent in both the PVA and PDMS, a fiber Bragg grating (FBG) is connected in series for temperature compensation. The proposed LPFG pressure sensor based on mode transition exhibits high sensitivity and a simple fabrication process, making it a promising candidate for applications in high-precision pressure sensing.

Key words: long period fiber grating (LPFG), mode transition, polyvinyl alcohol (PVA), polydimethylsiloxane (PDMS), gas pressure sensing

中图分类号:

O439

王朝垣, 伍华焱, 周毅, 黄荷雨, 周爱. 基于模式转换的LPFG气压传感器性能研究[J]. 应用科学学报, 2025, 43(5): 721-729.

WANG Chaoyuan, WU Huayan, ZHOU Yi, HUANG Heyu, ZHOU Ai. Research on Performance of LPFG Gas Pressure Sensor Based on Mode Transition[J]. Journal of Applied Sciences, 2025, 43(5): 721-729.

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基于模式转换的LPFG气压传感器性能研究

Research on Performance of LPFG Gas Pressure Sensor Based on Mode Transition

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