CHENG Si-yang, GAO Min-guang, XU Liang, JIN Ling, LI Sheng, Tong Jing-jing, LIU Jian-guo, LIU Wen-qing. Remote sensing of CH4 column concentration in atmosphere based on direct-sun infrared absorption spectroscopy[J]. Chinese Journal of Quantum Electronics, 2014, 31(1): 18