[1] [1] LI Lin. Research on the development and development trend of various modes of transportation[J]. Heilongjiang Traffic Technology, 2012(7): 152-153.

[2] [2] WANG Shan, SUN Quanxin. Study on safety system of high speed railway[J]. Inner Mongolia Science and Technology and Economy, 2003(4): 69-71.

[3] [3] Sophian A, Edwards R S, TIAN G Y, et al. Dual-probe methods using pulsed eddy currents and electromagnetic acoustic transducers for NDT inspection[J]. Or Insight, 2007, 47(6): 341-345.

[4] [4] WU Zongfan. Principle and technology development of infrared thermal imager[J]. Modern Science Instruments, 1997(2): 28-30.

[5] [5] WU Yongqiang. Design and technology of low voltage halogen lamps[J].Vacuum Electronic Technology, 2002(6): 47-48.

[6] [6] HUANG Tao. Quantitative detection of rail fatigue crack depth based on infrared thermal wave technology[D]. Lanzhou: Lanzhou JiaoTong University, 2015: 19-27.