Pd-coated elastooptic fiber optic Bragg grating sensors for multiplexed hydrogen sensing
Pd-coated elastooptic fiber optic Bragg grating sensors for multiplexed hydrogen sensing
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DOI：
10.1016/s0925-4005(99)00240-3
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发表时间：
1999-11-02
影响因子：
8.4
通讯作者：
Kazemi, A
中科院分区：
文献类型：
--
作者：
Sutapun, B;Tabib-Azar, M;Kazemi, A
报道了一种新型的钯膜光纤布拉格光栅氢传感器。该装置中的传感机制基于钯涂层吸收氢时在钯涂层中引起的机械应力。钯涂层中的应力拉伸并移动FBG的布拉格波长。使用具有不同波长的FBG，许多这样的氢传感器可以在单个光纤上多路复用。这里演示了多路复用两个传感器。此外，氢和热敏传感器的灵敏度计算使用一个简单的弹性模型。此外，为了量化钯膜中的应力量作为氢浓度的函数，设计了一种新颖且非常灵敏的方法，并使用倏逝波微波探针来检测Pd涂覆的悬臂梁中的偏转。对于室温下0.5-1.4%的H-2浓度，该应力在5.26-8.59 × 10（-7）Pa的范围内，这比在相同范围的H-2浓度下在本体钯中发现的大约大三倍。(C)1999年Elsevier Science S.A. All rights reserved.
We report a new type of optical hydrogen sensor with a fiber optic Bragg grating (FBG) coated with palladium thin film. The sensing mechanism in this device is based on mechanical stress that is induced in the palladium coating when it absorbs hydrogen. The stress in the palladium coating stretches and shifts the Bragg wavelength of the FBG. Using FBGs with different wavelengths many such hydrogen sensors can be multiplexed on a single optical fiber. Here multiplexing two sensors is demonstrated. Moreover, hydrogen and thermal sensitivities of the sensors were calculated using a simple elastic model. Additionally, to quantify the amount of stress in the palladium film as a function of hydrogen concentration, a novel and very sensitive method was devised and used to detect deflections in a Pd-coated cantilever using an evanescent microwave probe, This stress was in the range of 5.26-8.59 X 10(-7) Pa for H-2 concentrations of 0.5-1.4% at room temperature, which is about three times larger than that found in the bulk palladium for the same range of H-2 concentrations. (C) 1999 Elsevier Science S.A. All rights reserved.