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首页> 外文期刊>Structural health monitoring >Long-period fiber grating moisture sensor with nano-structured coatings for structural health monitoring
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Long-period fiber grating moisture sensor with nano-structured coatings for structural health monitoring

机译：带有结构涂层的纳米结构涂层的长周期光纤光栅湿度传感器

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摘要

In this article, we inscribe long-period gratings on an SMF-28 optical fiber by a focused CO_2 laser beam to develop a humidity sensor with high sensitivity and selectivity for moisture detection for civil infrastructures health monitoring. We propose two types of nano-structured film to deposit on surface of the grating region by electrostatic self-assembly deposition process. The primary nanofilm coating (PAH~+/PAA~-) does not affect long-period grating properties such as resonance wavelength and transmission intensity; however, it increases the sensitivity by changing the refractive index of the surrounding analytes. The secondary nanofilm coating (Al_2O_3~+/PSS~-), due to its molecule structure compatibility, can selectively adsorb analyte molecules of interest (in this case H_2O only). The experimental results reveal that the nanofilm-coated long-period gratings are more sensitive to moisture in terms of both wavelength shift and resonance intensity change as of 0.019%/pm and 0.01%/10~(-3) dBm, respectively, while the bare LPG coefficients are 0.021%/pm and 0.0603%/10~(-3) dBm. The proposed sensor shows excellent thermal stability as well.
机译：在本文中，我们通过聚焦的CO_2激光束在SMF-28光纤上刻写了长周期光栅，以开发出一种对湿度检测具有高灵敏度和选择性的湿度传感器，用于民用基础设施健康监测。我们提出两种类型的纳米结构薄膜，通过静电自组装沉积工艺沉积在光栅区域的表面上。初级纳米薄膜涂层（PAH〜+ / PAA〜-）不会影响长周期的光栅特性，例如共振波长和透射强度；但是，它通过改变周围分析物的折射率来提高灵敏度。次级纳米膜涂层（Al_2O_3〜+ / PSS_-）由于其分子结构相容性，可以选择性地吸附感兴趣的分析物分子（在这种情况下仅为H_2O）。实验结果表明，纳米膜包覆的长周期光栅在波长漂移和共振强度变化方面分别对水分敏感，分别为0.019％/ pm和0.01％/ 10〜（-3）dBm，而裸LPG系数为0.021％/ pm和0.0603％/ 10〜（-3）dBm。所提出的传感器也显示出优异的热稳定性。

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