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Defect Detection in Railroad Wheels

Guided wave magnetostrictive sensor permits detection of surface and sub-surface defects on the tread of a stationary railroad wheel from a single point of inspection.
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The patent-pending magnetostrictive sensor and technique permit inspecting the full circumference of the wheel tread from a single point of contact. The wave penetrates approximately 10mm (0.4”) in the wheel tread and detects internal (non-visible) and surface defects with an easy-to-use application. The compact sensor can be applied on wheels mounted on trains or in a railroad yard.


  • Magnetostrictive EMAT technique (patent pending).
  • The guided wave penetrates 10mm (0.4”) in the wheel tread and detects surface and subsurface defects at any point on the wheel tread.
  • Provides 360° inspection without scanning or rotating the wheel (15s per wheel).
  • Integrated application available for inspection of wheels while the train is in motion (Contact Innerspec for details).

Software Upgrades

  • MRUT

Check out this paper to learn more about inspection of railroad wheels. VIEW

Related Instruments

The following instruments are recommended for this application.


Standard EMAT and DCUT Sensors and Accessories for the most common applications (normal beam, guided waves, angled beam)

If you would like any more information on this system, please contact us, and one of our experts will be in touch.