Vernier effect enhanced fiber Fabry–Pérot relative humidity sensor based on confined expansion of CaAlg hydrogel film

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

Optical Fiber Technology Pub Date : 2025-09-27 DOI:10.1016/j.yofte.2025.104428

Jianxuan Wang , Jing Zhang , Xuejiao E , Xuefeng Chen , Xiujuan Yu

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引用次数: 0

Abstract

A high-sensitivity optical fiber relative humidity (RH) sensor enhanced by the Vernier effect is proposed. The sensing head consists of a humidity-sensitive Fabry–Pérot interferometer (FPI) formed at the junction of a single-mode fiber (SMF) and a hollow-core capillary fiber (HCF), where a calcium alginate (CaAlg) hydrogel film is tension-coated to serve as an elastic diaphragm. A parallel humidity-insensitive reference FPI, based on a SMF–HCF–SMF structure, is integrated to generate a Vernier interference effect, significantly amplifying the spectral response to humidity variations. The HCF is tapered to improve film adhesion and mechanical responsiveness. Upon exposure to moisture, the CaAlg film absorbs moisture and undergoes elastic buckling due to internal stress, leading to an effective cavity length change and a corresponding spectral shift. Experimental results show a nonlinear cubic response in the 50 %–95 % RH range, with a sensitivity peak of −7.19 nm/%RH was achieved at 95 % relative humidity and the polynomial correlation coefficient of 0.998. The sensor also demonstrates good repeatability and a low temperature cross-sensitivity of −0.369 nm/°C. This long-term stability, low-cost and high sensitive detection system has significant potential for application in field of industry and agriculture.

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基于CaAlg水凝胶膜受限膨胀的游标效应增强纤维fabry - p相对湿度传感器

提出了一种利用游标效应增强的高灵敏度光纤相对湿度传感器。传感头由一个湿度敏感的法布里-普氏干涉仪（FPI）组成，该干涉仪形成于单模光纤（SMF）和空心芯毛细管光纤（HCF）的连接处，其中海藻酸钙（CaAlg）水凝胶膜被拉伸涂层作为弹性隔膜。基于SMF-HCF-SMF结构的并联湿度不敏感参考FPI可产生微调干涉效应，显著放大湿度变化的光谱响应。HCF是锥形的，以提高薄膜的附着力和机械响应性。CaAlg薄膜在受潮后会吸收水分，并由于内应力而发生弹性屈曲，导致有效腔长变化和相应的光谱位移。实验结果表明，在50% ~ 95%相对湿度范围内具有非线性三次响应，95%相对湿度下灵敏度峰值为−7.19 nm/%RH，多项式相关系数为0.998。该传感器还具有良好的重复性和−0.369 nm/°C的低温交叉灵敏度。这种长期稳定、低成本、高灵敏度的检测系统在工农业领域具有很大的应用潜力。

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.