| Lu-jun Cui,Hui-chao Shang,Gang Zhang,Yong Li,Ze-xiang Zhao.Experimental study on optical fiber bundle hydrogen sensor based on palladium-silver optical thin film[J].Optoelectronics Letters,2013,9(1):13-17 |
| Experimental study on optical fiber bundle hydrogen sensor based on palladium-silver optical thin film |
| Author Name | Affiliation | E-mail | | Lu-jun Cui | School of Mechanical & Electronic Engineering, Zhongyuan University of Technology, Zhengzhou, 450007, China | cuilujun@126.com | | Hui-chao Shang | School of Mechanical & Electronic Engineering, Zhongyuan University of Technology, Zhengzhou, 450007, China | | | Gang Zhang | School of Mechanical & Electronic Engineering, Zhongyuan University of Technology, Zhengzhou, 450007, China | | | Yong Li | School of Mechanical & Electronic Engineering, Zhongyuan University of Technology, Zhengzhou, 450007, China | | | Ze-xiang Zhao | School of Mechanical & Electronic Engineering, Zhongyuan University of Technology, Zhengzhou, 450007, China | |
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| Abstract: |
| In this paper, a 20 nm palladium-silver (Pd/Ag) ultrathin optical film is used for hydrogen gas sensing. The mole ratio of the two metals is controlled at Pd:Ag=3:1. In the direct current (DC) sputtering machine, the optical thin film is evaporated on the optical glass. Compared with pure palladium, the Pd/Ag alloy can increase the life and the stability of the sensing film. Optimum sputtering parameters for Pd/Ag alloy are presented in this paper, and the effects of different experimental conditions for hydrogen sensor are investigated, including the temperature effect, humidity effect and cross sensitivity of hydrogen sensor for different gases. The experiment results indicate that the hydrogen sensor based on Pd/Ag optical thin film exhibits good sensing characteristics. The existing of CO and water in hydrogen increases the response time and decreases the response amplitude of optical fiber bundle hydrogen sensor. The experiment results show that the increasing temperature can eliminate the effect and shorten hydrogen sensor response time effectively. |
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