Interferometric optical fiber sensor for simultaneous humidity and temperature measurement based on PVA/PAA hydrogel coating

IF 2.7 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Optical Fiber Technology Pub Date : 2025-07-07 DOI:10.1016/j.yofte.2025.104338

Yongjin Chen, Jiahui Fu, Peng Huang, Shujia Ding, Zhongchao Wei, Chunhua Tan, Faqiang Wang, Hongyun Meng

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引用次数: 0

Abstract

This paper presents a SCTCS symmetric structure interferometric fiber sensor coated with polyvinyl alcohol (PVA)/polyacrylic acid (PAA) composite hydrogel for simultaneous measurement of humidity and temperature. The sensor consists of a single-mode fiber (SMF), a coreless fiber (CLF), a thin core fiber (TCF), CLF and SMF sequentially spliced to form the SMF + CLF + TCF + CLF + SMF (SCTCS) structure. The surface of sensor was uniformly coated with PVA/PAA hydrogel and when the hydrogel came into contact with water molecules in the air it changed the effective refractive index of the fiber cladding. And the wavelength of the resonance valley shifts as the phase difference of the sensor changes, which is also related to variations in the relative humidity of the environment. The experimental results reveal that the sensor exhibits good regularity in response to the measured physical quantity. The sensitivities were 0.302 nm/%RH and 0.064 nm/°C in the ranges of 30 %RH to 60 %RH and 30 °C to 70 °C, respectively, both showing excellent linearity. Sensor repeatability performance measurements showed a maximum error rate of 0.161 % for RH and 0.05 % for temperature, and stability standard deviations 0.0587 nm and 0.0497 nm for RH and temperature, respectively, which demonstrated good overall performance. In this study, PVA/PAA composite hydrogel was firstly applied to the humidity measurement of transmission all-fiber-optic sensor, achieving good and stable linear sensitivity in the measurement of RH and temperature with lower fabrication difficulty and better compactness.

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基于PVA/PAA水凝胶涂层的干涉式光纤温湿度传感器

提出了一种以聚乙烯醇(PVA)/聚丙烯酸（PAA）复合水凝胶包覆的SCTCS对称结构干涉式光纤传感器，用于同时测量湿度和温度。该传感器由单模光纤（SMF）、无芯光纤（CLF）、薄芯光纤（TCF）组成，CLF与SMF依次拼接形成SMF + CLF + TCF + CLF + SMF （SCTCS）结构。在传感器表面均匀涂覆PVA/PAA水凝胶，当水凝胶与空气中的水分子接触时，会改变光纤包层的有效折射率。并且谐振谷的波长随着传感器相位差的变化而发生位移，这也与环境相对湿度的变化有关。实验结果表明，传感器对所测物理量的响应具有良好的规律性。在30% RH ~ 60% RH和30℃~ 70℃范围内，灵敏度分别为0.302 nm/%RH和0.064 nm/°C，均具有良好的线性关系。传感器重复性性能测量结果显示，相对湿度和温度的最大误差率分别为0.161%和0.05%，相对湿度和温度的稳定性标准偏差分别为0.0587 nm和0.0497 nm，整体性能良好。本研究首次将PVA/PAA复合水凝胶应用于透射式全光纤传感器的湿度测量，在测量RH和温度时获得了良好稳定的线性灵敏度，且制作难度低，紧凑性好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Fiber Technology 工程技术-电信学

CiteScore

4.80

自引率

11.10%

发文量

327

审稿时长

63 days

期刊介绍： Innovations in optical fiber technology are revolutionizing world communications. Newly developed fiber amplifiers allow for direct transmission of high-speed signals over transcontinental distances without the need for electronic regeneration. Optical fibers find new applications in data processing. The impact of fiber materials, devices, and systems on communications in the coming decades will create an abundance of primary literature and the need for up-to-date reviews. Optical Fiber Technology: Materials, Devices, and Systems is a new cutting-edge journal designed to fill a need in this rapidly evolving field for speedy publication of regular length papers. Both theoretical and experimental papers on fiber materials, devices, and system performance evaluation and measurements are eligible, with emphasis on practical applications.