Chinese Journal of Lasers, Volume. 47, Issue 8, 811003(2020)
Detection of Methane Hydrate in Deep Sea Based on Off-Axis Integrated Cavity Output Spectroscopy
Methane hydrate is a new clean energy source. For the cruise detection of methane hydrate, membrane separation off-axis integrated cavity output spectroscopy, M-ICOS, is applied to detect dissolved methane (CH4) and carbon dioxide (CO2). An M-ICOS system comprises a membrane separation unit, a cavity temperature and pressure controller, an optical cavity, a spectrometer unit, and an industrial personal computer. The M-ICOS system is tested for performance evaluation. The accuracies of the temperature and pressure controller are 0.0003733 ℃ and 0.6799 Pa, respectively. The limits of detection of CH4 and CO2 are 0.56×10 -9 and 0.62×10 -6, respectively. A field experiment in Shenhu area, South China Sea, found a strong fluctuation in the gas concentration at the depth of 500--700 m, which was probably because the sea flow took high concentration gas from the methane hydrate enrichment area. Experimental results reveal that the system exhibits a good sensitivity and stability, which make it usable to detect CH4 and CO2 in deep sea for cruise detection of the methane hydrate.
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Dong Yang, Wang Jingjing, Zhou Xinyu, Zhu Gongdong, Qu Kang, Wu Xiang''en, Lü Wanjun, Wen Mingming, Tan Tu, Liu Kun, Gao Xiaoming. Detection of Methane Hydrate in Deep Sea Based on Off-Axis Integrated Cavity Output Spectroscopy[J]. Chinese Journal of Lasers, 2020, 47(8): 811003
Category: spectroscopy
Received: Mar. 13, 2020
Accepted: --
Published Online: Aug. 17, 2020
The Author Email: Xiaoming Gao (xmgao@aiofm.ac.cn)