Optical fiber Bragg grating hydrogen sensor based on evanescent-field interaction with palladium thin-film transducer
Optical fiber Bragg grating hydrogen sensor based on evanescent-field interaction with palladium thin-film transducer
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DOI：
10.1016/j.optlaseng.2009.04.002
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发表时间：
2009-10-01
影响因子：
4.6
通讯作者：
Willsch, Reinhardt
中科院分区：
文献类型：
--
作者：
Schroeder, Kerstin;Ecke, Wolfgang;Willsch, Reinhardt
单模光纤中的光纤布拉格光栅（FBG）传感器广泛应用于温度和应变的测量。如果通过光纤的平面侧抛光技术将FBG传感器暴露于外部分析物，则渐逝场相互作用也通过改变分析物的折射率来产生布拉格波长偏移。在侧面抛光的光纤上沉积传感器特定的换能器层可以指定这种光谱编码和网络能力的光化学光纤布拉格光栅折射测量来监测特定的物质、吸收的气体和蒸汽。本文以钯薄膜传感器为例，阐述了该传感器的工作原理。在0.1-4%体积浓度范围内的氢可以通过布拉格波长的光谱移动来监测，这是由于随着氢的吸收增加，I'd的复折射率减小而引起的。(C)2009爱思唯尔有限公司版权所有。
Fiber Bragg grating (FBG) sensors in single-mode optical fibers are widely applied for measurement of temperature and strain. If exposing FBG sensors to an external analyte by planar side-polishing technique of the fiber, evanescent-field interaction yields a Bragg wavelength shift also by changing the refractive index of the analyte. Deposition of sensor-specific transducer layers on the side-polished fiber can specify this spectrally encoding and network-capable optochemical fiber Bragg grating refractometry to the monitoring of specific substances, absorbed gases and vapors. In this paper, the sensor principle is demonstrated for the example of a hydrogen gas sensor based on a palladium thin-film transducer. Hydrogen in 0.1-4% volume concentration range can be monitored by the spectral shift of the Bragg wavelength, which is caused by the decreasing complex refractive index of I'd with increasing absorption of hydrogen. (C) 2009 Elsevier Ltd. All rights reserved.