Abstract

The paper concerns a defectoscopy of squats occurring on the surface of the rail head. Disadvantages of traditional methods being used in detection of such defects were also presented. Authors proposed a new method based on simplified laser scatterometry to detect these defects. Physical model of the laser beam scattering by edges of such defects and simulation results were given. An experimental set-up for practical testing of this method was designed and constructed. This system enabled measurements of squat defects occurring in the section of the rail extracted from the track. The analysis of obtained results was performed. Authors also indicated directions of further research and development.

Highlights

  • Surface defects occurring on the rail head are extremely difficult to detect, they can pose a serious threat to the railway traffic

  • Areas I and II correspond to the running surface of the rail. It means that laser beam is completely reflected from the surface, what allows for perfect detection of the beam by PIN detector

  • When laser beam reaches the edge of defect, it is reflected from the bottom of the defect and moves to areas III and IV

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Summary

Introduction

Surface defects occurring on the rail head are extremely difficult to detect, they can pose a serious threat to the railway traffic. The paper presents the physical model of laser beam scattering by edges of squats and simulation results. In this approach based on simplified variant of laser scatterometry, a single photo-detector (photo-diode) receives the light reflected by the surface of the defect.

Results
Conclusion

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