Title :
Optical Fiber Hydrogen Sensors with Pd/W03 Composite Thin Film by Magntron Co-Sputtering
Author :
Yang, Minghong ; Sun, Yan ; Zhang, Dongsheng ; Jiang, Desheng
Author_Institution :
Nat. Eng. Lab. for Opt. Fiber Sensors, Wuhan Univ. of Technol., Wuhan, China
Abstract :
A fiber-optic hydrogen gas sensor using composite palladium and tungsten trioxide (WO3) was proposed and characterized. This sensor utilizes the absorption of the evanescent field interaction in the clad of Pd/WO3 thin film which was prepared by magnetron co-sputtering process, coated on a silica core. Modulation of optical power intensity is observed, a clear increase of power with hydrogen and decrease of power without hydrogen can be concluded. Compared to pure Pd sensitive material, an improvement of response time is reported. Meanwhile, there is no recovery in nitrogen environment, and recovery happens only in oxygen-existing condition. It is suspected that the recovery process is connected to oxidation of the Pd/WO3 surface.
Keywords :
fibre optic sensors; gas sensors; hydrogen; optical modulation; palladium; tungsten compounds; H; Pd-WO3; composite thin film; evanescent field interaction; magntron co-sputtering; optical fiber hydrogen sensors; optical power intensity modulation; tungsten trioxide; Gas detectors; Hydrogen; Optical fiber sensors; Optical fibers; Optical films; Optical modulation; Palladium; Sensor phenomena and characterization; Thin film sensors; Tungsten;
Conference_Titel :
Photonics and Optoelectronics, 2009. SOPO 2009. Symposium on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-4412-0
DOI :
10.1109/SOPO.2009.5230235
