Yang Zhen, Zhang Min, Liao Yanbiao, Tian Qian, Li Qisheng, Zhang Yi, Zhuang Zhi
State Key Laboratory of Precision Measurement Technology and Instruments,Tsinghua University, Beijing 100084, China.
Appl Opt. 2010 May 20;49(15):2736-40. doi: 10.1364/AO.49.002736.
We present a new hydrogen sensor system based on the use of an optical fiber extrinsic Fabry-Perot interferometer coated with palladium silver (Pd-Ag) film. The sensing mechanism of such a sensor is based on the mechanical stress that is induced in the Pd-Ag film when it absorbs hydrogen. To obtain the absolute length of the air gap, a modified cross-correlation signal processing method is introduced. Results are presented for a comparison between two Pd-Ag films of different thicknesses. A temperature compensation method based on an optical switch is presented. The sensor is suitable for monitoring concentrations of hydrogen below the lower explosive limit.
我们展示了一种基于使用涂有钯银（Pd-Ag）薄膜的光纤外腔法布里-珀罗干涉仪的新型氢传感器系统。这种传感器的传感机制基于Pd-Ag薄膜吸收氢气时所产生的机械应力。为了获得气隙的绝对长度，引入了一种改进的互相关信号处理方法。给出了不同厚度的两种Pd-Ag薄膜之间的比较结果。提出了一种基于光开关的温度补偿方法。该传感器适用于监测低于爆炸下限的氢气浓度。
