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We examined the applicability of Raman spectroscopy as a laser remote sensing tool for monitoring CH4 in water. The Raman technique has already been used successfully for measurements of CO2 gas in water. In this paper, considering the spectral transmittance of water, third harmonics of Q-switched Nd:YAG laser at 355 nm (UV region) was used for detection of CH4 Raman signals. The Raman signal at 2892 cm-1 from CH4 dissolved in water was detected at a tail of water Raman signal.

Raman spectroscopy measurement of CH4 gas and CH4 dissolved in water for laser remote sensing in water

Raman spectroscopy measurement of CH₄ gas and CH₄ dissolved in water for laser remote sensing in water