Laser-Air Hybrid Ultrasonic Technique (LAHUT) combines laser generation with air-coupled detection of ultrasound. The technique is non-contact and has the characteristic of operating from remote distances. Acoustic wave laser-generation apparatus can be meters away from the Interrogated surface while air-coupled detection standoff can be on the order of several centimeters. The technique has the unique capability of interrogating structural materials in their true industrial environment. Dynamic tests are performed on parts with complex geometry, limited accessibility and curved surfaces. Also, dark and rough finish surfaces, which significantly reduce the efficiency of optical detection techniques, can be interrogated successfully. These characteristics make the LAHUT ideal for many industrial applications including the railroad industry. It was developed for railroad inspections targeting the most critical cracks in rails and wheels. State of the art inspection techniques available to the railroad industry often miss Vertical Split Head (VSH) are performed on rail tracks detecting VSH, TDD and rail base cracks. The first two are often missed while the latter cannot be detected using conventional dynamic NDE techniques. Proof of concept tests are also performed on railroad wheels detecting thermal fatigue cracks along the wheel flange and tread and subsurface SRC along the wheel tread. No method exists for the railroad industry worldwide to perform wayside inspections of wheels on a moving train. Instead, wheels are remove and inspected in maintenance shops. Based on the proof of concept test results, two prototypes are now underway. In Italy, Tecnogamma Spa is developing a prototype for the dynamic inspection of rail tracks from a moving train while in the United States, the Transportation Technology Center (TTC), is developing a prototype for wayside dynamic inspection stations for wheels of a moving train.


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    Title :

    Laser-Air Hybrid Ultrasonic Technique for dynamic railroad inspection applications


    Additional title:

    Laser Lufthybrid Ultraschalltechnik zur Anwendung in der Eisenbahnprüfung


    Contributors:


    Publication date :

    2007


    Size :

    5 Seiten, 6 Bilder, 8 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Laser-air hybrid ultrasonic technique for dynamic railroad inspection applications

    Kenderian, S. / Cerniglia, D. / Djordjevic, B.B. et al. | Tema Archive | 2004


    Laser-air hybrid ultrasonic technique for dynamic railroad inspection applications

    Kenderian, S. / Cerniglia, D. / Djordjevic, B.B. et al. | Tema Archive | 2005


    Dynamic railroad inspection using the laser-air hybrid ultrasonic technique

    Kenderian, S. / Djordjevic, B.B. / Cerniglia, D. et al. | Tema Archive | 2006


    Proof of concept of wayside railroad wheel inspection using a laser-air hybrid ultrasonic technique

    Kenderian, S. / Cerniglia, D. / Djordjevic, B.B. et al. | Tema Archive | 2003


    Laser/air hybrid ultrasonic technique for railroad wheel testing

    Kenderian, S. / Djordjevic, B.B. / Green, R.E. jun. | Tema Archive | 2003