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Laser Ultrasound Tests Train Tracks

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Gary Boas

A train accident occurs in the US every 90 minutes, many of which are attributable to undetected cracks in the tracks. Ultrasound techniques are used to test for cracks, but they are limited in application and have difficulties detecting cracks that are vertical to the top surface of the rail or that are in its base. To address these issues, researchers at Johns Hopkins University in Baltimore have developed a laser-based ultrasound system that detects flaws current instruments miss and that does so at much higher speeds. The technique employs a Q-switched Nd:YAG laser to generate...Read full article

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    Published: May 2002
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