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Detecting rail defects

  • US 20070163352A1
  • Filed: 01/25/2005
  • Published: 07/19/2007
  • Est. Priority Date: 01/26/2004
  • Status: Active Grant
First Claim
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1. A method of detecting defects in a railway track rail, the rail having a longitudinal centre plane and a surface, the surface including a running surface, the method comprising directing an excitation laser beam to an excitation position on the surface of the rail to induce an ultrasonic wave in the rail;

  • and directing a detection laser beam to a detection position on the surface of the rail to detect at least one predetermined property of the induced ultrasonic wave;

    characterised in that the excitation position and the detection position are located on the running surface and displaced from the longitudinal centre plane of the rail.

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