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http://dx.doi.org/10.3795/KSME-C.2015.3.4.291

Effect of Methodologies for Laser-Induced Plasma Creation on Hydrogen Sensing  

Jang, Jung-Ik (Dept. of Mechanical Engineering, Chungbuk Nat'l Univ.)
Kim, Ki-Bum (Dept. of Mechanical Engineering, Chungbuk Nat'l Univ.)
Publication Information
Transactions of the KSME C: Technology and Education / v.3, no.4, 2015 , pp. 291-297 More about this Journal
Abstract
As promising future energy source, hydrogen has been drawing much attention; however, it is easily leaked from the small gap in any storage container due to its find molecule size. In this study, Laser induced breakdown spectroscopy(LIBS) was used for hydrogen leak detection, and feasibility of the scheme was evaluated based on different way for plasma generation. Laser power of 295 mW was required for generating plasma on metal surface to measure hydrogen atomic emission while approximately 2.5 times higher laser power was needed for plasma formation directly in the hydrogen gas stream. It was shown that peak to base ratio increased linearly with increasing the concentration of hydrogen. It can be concluded that LIBS is a viable technique for hydrogen sensing when the concentration of hydrogen is less than 5%.
Keywords
Laser Induced Breakdown Spectroscopy; Leakage; Hydrogen;
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