Abstract
Ultrasonic flaw detection and sizing are important issues for ensuring structural reliability of industrial plants. The ultrasonic phased array technique is one of the most effective tools for visualizing the flaws in structural components. However, in the case of flaw size measurement, only an A-scope signal is used for calculation usually. On the other hand, the Time-of-Flight Diffraction method is known as the most accurate flaw sizing method. However, TOFD method is applicable only if the flaw exists on the perpendicular bisector of the ultrasonic probe pair. In this study, new flaw sizing method by using many ultrasonic oscillators was introduced. Through this process, dilution of precision (DOP) was introduced to evaluate measurement error of flaw tip position. By using numerical calculation, the relationship between the DOP and the flaw tip position measurement accuracy was investigated.
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