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With the train’s speed improving, and running interval time decreasing, traditional rail defect inspection methods cannot meet the efficiency requirement of railway industrial standards. In this paper, we propose a new online rail defect inspection method which is using electromagnetic tomography (EMT) technique. The method uses the tomographic approach to measure the alternating magnetic signal modulated...
As a result of the development of higher speed and heavier load of rail networks, rail defects have been more serious than ever before. This paper introduces the least squares method (LSM) to demodulate multi-frequency signals in electromagnetic rail inspection using eddy current detection. The demodulation speed of LSM is faster than other methods because it can estimate frequencies with one time...
This paper introduces an electromagnetic rail inspection method using excitation and detection coils in an AC bridge configuration. The differential output and summing output of two detection coils in the bridge can be used to evaluate rail defects and lift-off distance, respectively. When the sensor scans a non-defective rail track, the differential output will be near zero and the summing output...
A rail surface defects inspection method based on automated machine vision system is proposed in the paper. Two kinds of defect images including spalling of rail head and cracks in surface are analyzed with this method. Some related algorithms comprising denoising, image segmentation and feature extraction are applied in processing the images of rail surface defect. Then accurate region of defect...
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