Application of the hybrid laser ultrasonic method in rail inspection

作者：Zhao Y^*; Sun J H; Ma J; Liu S; Guo R; Song J F; Jia Z Q

来源：Insight: Non-Destructive Testing and Condition Monitoring , 2014, 56(7): 360-366.

DOI：10.1784/insi.2014.56.7.360

• laser ultrasonics
• electromagnetic acoustic transducer
• non-destructive testing
• rail
• wavelet soft-threshold method

Rails are systematically inspected for surface and internal defects using the hybrid laser-EMAT technique in the present work. Quantitative time-of-flight analysis of laser-generated, with EMAT-detected, Rayleigh-shear mode-converted waves and diffracted shear waves has demonstrated an effective method for the monitoring of surface and internal artificial defects, respectively. The technique of noise suppression based on the wavelet soft-threshold method (WSTM) was introduced to improve the testing accuracy and signal-to-noise ratio (SNR). Experimental evidence has validated the predicted results for the cases of surface cracks, surface vertical holes, bolt hole cracks and web holes.

• 出版日期2014-7
• 单位齐鲁工业大学