【摘 要】
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Background, Motivation and Objective Steel billet includes some defects such as inclusions or gases. There are several ultrasonic inspection methods for the billet: the pulse-echo method, the computer
【机 构】
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College of Engineering Systems, School of Science and Engineering, University of Tsukuba, Tsukuba, I
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Background, Motivation and Objective Steel billet includes some defects such as inclusions or gases. There are several ultrasonic inspection methods for the billet: the pulse-echo method, the computerized tomography method using time-of-flight, or the inspection method using back propagation. The first method is utilized actually, but the inspection accuracy is not enough. The second methods are currently under research and can visualize defects, but many paths are required. We have researched the third method to visualize defects as an alternative method of the second. In our previous research, the third method was proposed and evaluated by an experiment using a specimen of duralumin. However, the method should be improved and evaluated by using a specimen of steel. It is because steel billet is high-attenuation and it could become difficult to visualize defects. Our purpose is to improve the inspection method using back propagation and visualize defects in steel billet.
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