[1] X. Xian, H. Wang, D. Jiang, and B. Liu, “China coal mine fire fighting technology research,” Engineering Science, 2001, 3(12): 28–32.
[2] H. Luo and Y. Liang, “Status and prospects of coal spontaneous combustion prediction technology,” China Safety Science Journal, 2003, 13(3): 76–80.
[3] N. Li, “Research on gas detection and 2D distribution reconstruction by tunable diode laser absorption spectroscopy technique,” Ph.D. dissertation, Zhejiang University, China, 2008.
[4] J. Reid and D. Labrie, “Second harmonic detection with tunable diode lasers-comparision of experiment and theory,” Applied Physics B, 1981, 26(3): 203–210.
[5] J. M. Supple, E. A. Whittaker, and W. Lenth, “Theoretical description of frequency modulation and wavelength modulation spectroscopy,” Applied Optics, 1994, 33(27): 6294–6302.
[6] X. Tu, W. Liu, Y. Zhang, F. Dong, M. Wang, T. Wang, et al., “Second-harmonic detection with tunable diode laser absorption spectroscopy of CO and CO2 at 1.58 μm,” Spectroscopy and Spectral Analysis, 2006, 26(7): 1190–1194.
[7] Y. Shang, Y. Wei, C. Wang, T. Lei, and Z. Song, “The research of acetylene gas concentration on-line monitoring system based on absorption spectra,” Chinese Journal of Sensors and Actuators, 2010, 23(2): 171–174.
[8] S. Zhang, Q. Wang, Y. Zhang, F. Song, K. Chen, G. chou, et al., “Water vapor detection system based on scanning spectra,” Photonic Sensors, 2012, 2(1): 71–76.
[9] D. S. Borns, D. C. Hovde, S. Chen, and J. A. Sivler, “Early fire sensing using near IR diode laser spectroscopy,” in Proc. SPIE, vol. 4817, pp. 73–81, 2002.
[10] G. Lv, J. Chang, Q. Wang, Q. Wang, and W. Wei, “Research progress of optical H2O sensor with a DFB diode laser,” Photonic Sensors, 2014, 4(2): 113–119.
[11] D. P. Leleux, R. Claps, W. Chen, F. K. Tittel, and T. L. Harman, “Applications of Kalman filtering to real-time trace gas concentration measurements,” Applied Physics B, 2002, 74(1): 85–93.