High-precision distributed detection of rail defects by tracking the acoustic propagation waves

Cunzheng Fan, Hao Li, Baoqiang Yan, Yixiang Sun, Tao He, Tianye Huang, Zhijun Yan & Qizhen Sun
Nowadays, early defect detection plays a significant role for the railway safety warning. However, the existing methods cannot satisfy the requirements of real-time and high-precision detection. Here, a high-precision, distributed and on-line method for detecting rail defect is proposed and demonstrated. When a train goes through defects, the instantaneous elastic waves will be excited by the wheel-rail interaction, which will further propagate along railway tracks bidirectionally. Through mounting the backscattering enhanced optical fiber on the...
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