Denoising of phased array ultrasonic total focus image on rail bottom welds

The rail bottom weld area is prone to cracks, which can cause rail break. When using the ultrasonic total focus method(TFM) to detect rail bottom welds, there are a lot of background noise in the image due to the material impurities in the weld area, resulting in unobvious defect characterization. In this paper, the band-pass filtering method is used to filter and denoise the data collected in the...