Laser-air, hybrid, ultrasonic testing of railroad tracks

Measuring and testing – Vibration – By mechanical waves

Reexamination Certificate

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C073S655000, C073S656000, C073S657000

Reexamination Certificate

active

06945114

ABSTRACT:
Formed Laser Sources (FLS) using pulsed laser light for generation of ultrasonic stress waves are combined with air-coupled detection of ultrasound to provide for the hybrid non-contact, dynamic and remote ultrasonic testing of structural materials, especially railroad tracks. Using this hybrid technique, multimode and controlled frequency and wavefront surface acoustic waves, plate waves, guided waves, and bulk waves are generated to propagate on and within the rail tracks. The non-contact, remote nature of this methodology enables high-speed, fill access inspections of rail tracks. The flexibility and remote nature of this methodology makes possible the detection of critical cracks that are not easy, or impossible to detect, with current inspection techniques available to the railroad industry.

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Kenderian, Djordjevic and Green, “Laser-Based and Air Coupled Ultrasound as Noncontact and Remote Techniques for Testing Railroad Tracks,”Materials Evaluation, vol. 60(1), Jan. 2002, pp. 65-70.
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