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首页> 外文期刊>Optical fiber technology >Relative humidity sensor based on no-core multimode interferometer coated with Al_2O_3-PVA composite films
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Relative humidity sensor based on no-core multimode interferometer coated with Al_2O_3-PVA composite films

机译：基于涂有Al_2O_3-PVA复合膜的无芯多模干干涉仪的相对湿度传感器

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摘要

Herein, a simple relative humidity (RH) fiber sensor based on a multimode interferometer (MMI) with aluminum oxide nanoparticles (Al2O3 NPs) and polyvinyl alcohol (Al2O3-PVA) composite was fabricated and experimentally demonstrated. The sensor was fabricated by splicing a no-core fiber (NCF) segment between two single-mode fibers (SMF). The chemical etching method has been used with hydrofluoric (HF) acid to prepare diverse NCF diameters. This was proposed to expand the evanescent fields and enhance sensor sensitivity. A hydrophilic sensitive film based on Al2O3-PVA was coated on the surface of NC fiber using the cast-drop and evaporation technique. By altering the ambient humidity, water adsorption into the Al2O3 nanostructures occurs and therefore, the refractive index (RI) of the coated film varies inducing a 38.9 nm wavelength shift in the output spectra. The results showed that a maximum sensitivity of 0.587 nm/%RH has been achieved as the percentage of the RH increases from 30% to 100%. The simple fabrication and the high sensitivity of this sensor may prompt many potential applications in the fields of biology and chemistry.
机译：这里，制造基于多模干干涉仪（MMI）的简单的相对湿度（RH）光纤传感器（Al 2 O 3 NPS）和聚乙烯醇（Al 2 O 3 -PVA）复合物，并实验证明。通过在两个单模纤维（SMF）之间拼接无核心纤维（NCF）段来制造传感器。化学蚀刻方法已被用于氢氟（HF）酸以制备不同的NCF直径。这提出了扩展渐逝场并增强传感器灵敏度。使用浇注液和蒸发技术在Nc纤维表面上涂覆基于Al 2 O 3 -PVA的亲水性敏感膜。通过改变环境湿度，发生水吸附到Al 2 O 3纳米结构中，因此，涂覆膜的折射率（RI）在输出光谱中诱导38.9nm波长偏移。结果表明，随着RH的百分比从30％增加到100％，已经实现了0.587nm /％RH的最大敏感性。该传感器的简单制造和高灵敏度可以促使生物学和化学领域的许多潜在的应用。

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