Guided ultrasonic waves have shown great potential for structural health monitoring. Various types of transducer can be used for actuating and sensing of these waves. This includes non-contact approaches such as optical/laser techniques. Classical laser methods usually involve high energy interferometers. The paper demonstrates that a commercial laser vibrometer, designed for vibration/modal analysis, can be used for crack detection in metallic structures. The study involves a simple fatigue test in order to initiate and grow a crack. Lamb waves generated by one bonded piezoceramic transducer were sensed using a multi-point scanning laser vibrometer. The results demonstrate the potential of laser vibrometry for simple, rapid and robust detection of fatigue cracks in metallic structures.
|Translated title of the contribution||Structural health monitoring using scanning laser vibrometry: III. Lamb waves for fatigue crack detection|
|Pages (from-to)||1387 - 1395|
|Number of pages||9|
|Journal||Smart Materials and Structures|
|Publication status||Published - Dec 2005|