Wavelet-based laser-induced ultrasonic inspection in pipes

Martín E. Baltazar-López; Steve Suh; Ravinder Chona; Christian P. Burger

doi:10.1117/12.674482

10 February 2006 Wavelet-based laser-induced ultrasonic inspection in pipes

Martín E. Baltazar-López, Steve Suh, Ravinder Chona, Christian P. Burger

Proceedings Volume 6046, Fifth Symposium Optics in Industry; 604616 (2006) https://doi.org/10.1117/12.674482
Event: Fifth Symposium Optics in Industry, 2005, Santiago De Queretaro, Mexico

Abstract

The feasibility of detecting localized defects in tubing using Wavelet based laser-induced ultrasonic-guided waves as an inspection method is examined. Ultrasonic guided waves initiated and propagating in hollow cylinders (pipes and/or tubes) are studied as an alternative, robust nondestructive in situ inspection method. Contrary to other traditional methods for pipe inspection, in which contact transducers (electromagnetic, piezoelectric) and/or coupling media (submersion liquids) are used, this method is characterized by its non-contact nature. This characteristic is particularly important in applications involving Nondestructive Evaluation (NDE) of materials because the signal being detected corresponds only to the induced wave. Cylindrical guided waves are generated using a Q-switched Nd:YAG laser and a Fiber Tip Interferometry (FTI) system is used to acquire the waves. Guided wave experimental techniques are developed for the measurement of phase velocities to determine elastic properties of the material and the location and geometry of flaws including inclusions, voids, and cracks in hollow cylinders. As compared to the traditional bulk wave methods, the use of guided waves offers several important potential advantages. Some of which includes better inspection efficiency, the applicability to in-situ tube inspection, and fewer evaluation fluctuations with increased reliability.

Citation Download Citation

Martín E. Baltazar-López, Steve Suh, Ravinder Chona, and Christian P. Burger "Wavelet-based laser-induced ultrasonic inspection in pipes", Proc. SPIE 6046, Fifth Symposium Optics in Industry, 604616 (10 February 2006); https://doi.org/10.1117/12.674482

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