Differential fiber optic humidity sensor based on superhydrophilic SiO2/polyethylene glycol composite film with linear response

IF 2.7 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Optical Fiber Technology Pub Date : 2025-01-28 DOI:10.1016/j.yofte.2025.104150

Yutong Qi , Jinze Li , Yuxin Chen , Bao Zhu , Xingchen Zhou , Xuefei Xiao , Zheyuan Gu , Jun Qian , Chuanyang He , Min Lai , Yan Ma , Bo Liu

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Abstract

A differential fiber optic humidity sensor based on superhydrophilic SiO₂/polyethylene glycol (PEG) composite film is presented. With exposure to humid air, the physical properties of SiO₂/PEG composite film coated on the sensing region changes, disturbing transmission of evanescent wave of fiber and leading to change of the output light intensity of sensing fiber. The output light intensity of humidity sensor increases with the increase of relative humidity (RH), which is attributed to the expansion of polymeric film and less scattering of light. The sensor shows a linear response of the ratio of output light intensity of sensing fiber to that of reference fiber I_S/I_R to RH with a correlation coefficient of 0.991 in the range of 11–81 %RH. The ratio I_S/I_R is independent of the intensity of optical source, indicating that differential sensor structure enables humidity testing immune to instability of light source. In addition, the sensor possesses excellent reversibility, stability and repeatability.

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基于线性响应超亲水性SiO2/聚乙二醇复合薄膜的差分光纤湿度传感器

提出了一种基于超亲水性SiO2/聚乙二醇（PEG）复合薄膜的差动光纤湿度传感器。在潮湿空气中，涂层在传感区域上的SiO2/PEG复合薄膜的物理性质发生变化，干扰了光纤倏逝波的传输，导致传感光纤输出光强发生变化。湿度传感器的输出光强随着相对湿度（RH）的增加而增加，这是由于聚合物薄膜的膨胀和光散射的减少。在11% ~ 81% RH范围内，传感光纤输出光强与参考光纤输出光强之比IS/IR与RH呈线性关系，相关系数为0.991。IS/IR比值与光源强度无关，表明差分传感器结构使湿度测试不受光源不稳定性的影响。此外，该传感器具有良好的可逆性、稳定性和重复性。

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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.