Temperature-insensitive optical fiber sensor based on SMF-NCF-FMF-NCF-SMF spindle-shaped structure for refractive index measurement

IF 2 3区物理与天体物理 Q3 OPTICS Applied Physics B Pub Date : 2024-08-03 DOI:10.1007/s00340-024-08288-9

Lei Jing, Haozheng Yu, Zhengrong Tong, Weihua Zhang, Yipeng Tao, Jinlin Mu

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Abstract

A spindle-shaped sensor with temperature insensitivity based on single-mode fiber (SMF) - no-core fiber (NCF) - few-mode fiber (FMF) - NCF - SMF (SNFNS) for refractive index is proposed. An interferometer with SNFNS structure can be formed by fusing, and then the fiber can be shrunk to form a spindle shape through burning, which is known as an SNFNS spindle-shaped sensor. The introduction of NCF and curvature causes partial light transmitted in the core to enter the cladding, which results in the emergence of phase differences. The interference dips formed by modal interference have different sensitivities to the outside refractive index. The experimental results show that the maximum refractive index sensitivity of sensors is 258.5 nm/RIU in the range of 1.333–1.365. And the sensors have the characteristic of temperature insensitivity in the range of 10–70℃. Accordingly, the proposed sensors are ideal for applications in biomedicine, environment monitoring and other fields.

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基于 SMF-NCF-FMF-NCF-SMF 纺锤形结构的温度敏感型光纤传感器，用于折射率测量

提出了一种基于单模光纤（SMF）-无芯光纤（NCF）-少模光纤（FMF）-NCF-SMF（SNFNS）折射率的具有温度不敏感性的纺锤形传感器。通过熔合可形成具有 SNFNS 结构的干涉仪，然后通过燃烧可将光纤收缩形成纺锤形，这就是所谓的 SNFNS 纺锤形传感器。由于引入了 NCF 和曲率，在纤芯中传输的部分光线会进入包层，从而产生相位差。模态干涉形成的干涉凹点对外部折射率具有不同的敏感性。实验结果表明，在 1.333-1.365 范围内，传感器的最大折射率灵敏度为 258.5 nm/RIU。传感器还具有在 10-70℃ 范围内对温度不敏感的特性。因此，所提出的传感器非常适合应用于生物医学、环境监测和其他领域。

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来源期刊

Applied Physics B 物理-光学

CiteScore

4.00

自引率

4.80%

发文量

202

审稿时长

3.0 months

期刊介绍： Features publication of experimental and theoretical investigations in applied physics Offers invited reviews in addition to regular papers Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more 94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.