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Nondestructive Evaluation




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  image of ultrasonic data
  image of ultrasonic data
  image of ultrasonic data

The ultrasonic data obtained are shown for an undamaged bolt and bolts with 5- and 50-percent symmetric corrosion, respectively. Based on the time difference between the backwall signal (seen in all three oscilloscope traces at about 7.5 major screen divisions) and the multiple signals all with the same time separation (seen only in the lower oscilloscope trace), the remaining diameter can be calculated.

Recognized as an international leader in developing and applying nondestructive evaluation (NDE) technology for clients in industry and government, Southwest Research Institute (SwRI) engineers employ various inspection methods such as:

  • Cylindrically guided waves

  • Magnetostrictive sensors

Ultrasonics Projects

Successful ultrasonic NDE projects have focused on applications including:

  • Government infrastructure

  • Utility infrastructure

  • Pipelines

  • Nuclear power plants

  • Military aircraft components

Ultrasonics Capabilities and Past Projects

Selected ultrasonics capabilities and projects include:

For more information about our nondestructive evaluation (NDE) capabilities, ultrasonics technology, or how you can contract with SwRI, please contact Clinton J. Thwing, at or

(210) 522-3989.


Contact Information

Clinton J. Thwing

Ultrasonic Testing

(210) 522-3989

Related Terminology



corrosion damage

cylindrically guided wave technique

government infrastructure

high-voltage transmission tower anchor rod inspection

magnetostrictive sensors

military aircraft components

nuclear power plants



reactor pressure vessel inspection


utility infrastructure

| Sensor Systems and Nondestructive Evaluation (NDE) Technology Department | Mechanical Engineering Division | SwRI Home |

Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 9 technical divisions.