Development of Remote Sensing Technology for Hydrogen Gas Concentration Measurement Using Raman Scattering Effect

Abstract

A system for measuring Raman scattering light was constructed from a refracting telescope using a Fresnel lens and a Nd:YAG laser of wavelength 355 nm. Raman scattering signals from H2 gas released into open air and atmospheric N2 were simultaneously measured, and the concentration of H2 gas was calculated based on the ratio of these signals. The result showed that H2 gas concentration of 14 vol.% could be detected at a distance of 10 m. The sensitivity of the system was evaluated using a gas cell filled with H2 gas mixture, in which H2 gas concentration of 0.6 vol.% could be detected at a distance of 13 m.