[1] [1] D. Chen, W. Liu, Y. Zhang, J. Liu, R. Kan, M. Wang, X. Fang, and Y. Cui, Chin. Opt. Lett. 5, 121 (2007).

[2] [2] H. Xia, W. Liu, Y. Zhang, R. Kan, M. Wang, Y. He, Y. Cui, J. Ruan, and H. Geng, Chin. Opt. Lett. 6, 437 (2008).

[3] [3] S. Hu, H. Hu, Y. Zhang, J. Zhou, G. Yue, K. Tan, Y. Ji, and B. Xu, Chin. Opt. Lett. 1, 435 (2003).

[4] [4] U. Platt, “Differential optical absorption spectroscopy (DOAS)” in Air Monitoring by Spectroscopic Techniques M. W. Sigrist, (ed.) (Wiley, New York, 1994) chap. 2.

[5] [5] X. Zhang and K. Xu, Chin. J. Sensors and Actuators (in Chinese) 20, 1963 (2007).

[6] [6] B. Zhou, W. Liu, F. Qi, Z. Li, and Y. Cui, Acta Phys. Sin. (in Chinese) 50, 1818 (2001).

[7] [7] P. Xie, W. Liu, Z. Zheng, Q. Wei, Y. Wang, and J. Liu, Acta Photon. Sin. (in Chinese) 29, 271 (2000).

[8] [8] B. Song, W. Liu, Y. Zhang, and Z. Zheng, Chin. J. Quantum Electron. (in Chinese) 20, 680 (2003).

[9] [9] J. S. Lee, B. J. Kuk, and Y. J. Kim, J. Korean Phy. Soc. 41, 693 (2002).

[10] [10] G. Tang, C. Xu, M. Kong, and S. Wang, Proc. Chin. Soc. Elec. Eng. (in Chinese) 27, (11) 6 (2007).

[11] [11] G. Tao, R. Lu, and S. Ye, Acta Metrolog. Sin. (in Chinese) 23, 233 (2002).

[12] [12] J. Mellqvist and A. Rosén, J. Quant. Spectrosc. Radiat. Transfer 56, 209 (1996).

[13] [13] H. Zheng, Instrument Technique and Sensor (in Chinese) 10, 52 (2006).