title: Extrinsic Fabry-Perot interferometric optical fiber hydrogen detection system.
abstract: 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.
authors.affiliation: State Key Laboratory of Precision Measurement Technology and Instruments,Tsinghua University, Beijing 100084, China. yyyzzz111@gmail.com
authors.forename: Zhen
authors.initials: Z
authors.lastname: Yang
authors.forename: Min
authors.initials: M
authors.lastname: Zhang
authors.forename: Yanbiao
authors.initials: Y
authors.lastname: Liao
authors.forename: Qian
authors.initials: Q
authors.lastname: Tian
authors.forename: Qisheng
authors.initials: Q
authors.lastname: Li
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Zhi
authors.initials: Z
authors.lastname: Zhuang