OS0308 An Approach for Tomographic Reconstruction of Damage Image Based on Lamb Waves

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  • OS0308 ラム波による損傷画像の構築技術に関する研究(OS3-2 超音波,OS-3 非破壊評価と構造モニタリング1)

Abstract

Up to date, the non-destructive testing (NDT) is mainly realized by using ultrasonic inspection, X-ray inspection, eddy-current testing and magnetic-particle testing, etc. These inspection methods have high accuracy and reliability. However, they also have some disadvantages. For instance, they usually take a long time to finish the inspection process because their inspection area is relatively narrow at one time. To overcome this demerit, the damage inspection techniques with Lamb waves which can detect a wide area due to their long-distance propagation ability are actively studied in recent years. In the present work, based on an inverse algorithm, a tomographic reconstruction technique of damage image, e.g., the area and shape of a damage, by using the amplitude decrease of the transmitted Lamb wave through the damage, is proposed. From the obtained experimental results, the validity of the proposed method for reconstructing the damage image is verified. This method can be also applicable to the case where multiple damages exist in the inspected area.

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