To KANG Hak-Joon KIM Sung-Jin Song

(School of Mechanical Engineering, Sungkyunkwan University  Suwon, Korea)

Received Oct. 27, 2009

Revised May 8, 2010

Abstract Ultrasonic guided wave becomes one of promising tool for monitoring various types of structures such as large steel plates, vessels, and pipes in oil, chemical or nuclear industry,because guided waves have ability to travel wide range of the target structure in a single position.However, analysis of guided wave signals acquired from structure is difficult on account of low S/N ratio and its dispersive nature. To improve S/N ratio and overcome dispersion effect,focusing techniques for guided waves are needed. Thus, in this study, focusing techniques for guided waves were developed in order to improve long range inspection ability, and performance of the developed techniques was verified by experiments.

PACS numbers:43.20,43.35