An attempt for detecting impurity particles suspended in molten zinc at 650°C has been made using a focused ultrasonic pulse-echo technique with a clad metallic buffer rod. The focused ultrasonic waves are generated by a spherical acoustic lens which is fabricated at the end of the buffer rod. An experiment is carried out at 10 MHz. The result shows that impurity particles in molten zinc are detectable by using the presented focusing buffer rod.
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IHARA et al. (2000) studied this question.
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