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Optical properties enhancement with multilayer coating technique of additive-enhanced zinc oxide nanostructure for fiber Bragg grating humidity sensor
Microwave and Optical Technology Letters ( IF 1.5 ) Pub Date : 2021-10-07 , DOI: 10.1002/mop.33061
Muhammad Arif Riza 1 , Yun Ii Go 1 , Robert R. J. Maier 2 , Sulaiman Wadi Harun 3 , Siti Barirah Ahmad Anas 4
Affiliation  

A humidity sensing material is usually hygroscopic in nature and can allow sites for water adsorption. The hygroscopic material is usually coated in various devices for sensing enhancement. A zinc oxide additive-enhanced nanostructure (ZnO-HMT) was coated repeatedly on fiber Bragg grating (FBG) have been fabricated. The sensing material was synthesized for the purpose of characterizing its capability in enhancement of relative humidity sensing of uniformly grated core optical fibers with multiple layers of sensing layer. The coating and annealing process was repeated for at least three times resulting three layers of ZnO-HMT coated on an FBG fiber. Observed microscopy images showed that the thickest coating began to form larger lumps on the sensor surface, but absence of any gaps present. Reflectivity power was observed to be greatest for triple layered samples due to the coating possibly containing the light propagation and prevent evanescent leakages. Analysis with optical spectrum analyzer detects notable wavelength shifts at sensing range of 60–80 %RH and a significant increase of sensitivity for triple layered samples.

中文翻译:

用于光纤布拉格光栅湿度传感器的添加剂增强氧化锌纳米结构的多层涂层技术增强光学性能

湿度传感材料在性质上通常是吸湿的,并且可以允许吸水位点。吸湿性材料通常涂在各种用于感应增强的装置中。在光纤布拉格光栅 (FBG) 上反复涂覆氧化锌添加剂增强纳米结构 (ZnO-HMT)。合成传感材料的目的是表征其增强具有多层传感层的均匀磨碎芯光纤的相对湿度传感的能力。将涂覆和退火过程重复至少三次,从而在 FBG 光纤上涂覆三层 ZnO-HMT。观察到的显微镜图像显示,最厚的涂层开始在传感器表面形成更大的团块,但不存在任何间隙。由于涂层可能包含光传播并防止瞬逝泄漏,因此观察到三层样品的反射功率最大。使用光谱分析仪进行分析可在 60–80 % RH 的传感范围内检测到显着的波长偏移,并显着提高了三层样品的灵敏度。
更新日期:2021-12-01
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